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1 | /* |
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2 | * loopy.c: |
3 | * |
4 | * An implementation of the Nikoli game 'Loop the loop'. |
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5 | * (c) Mike Pinna, 2005, 2006 |
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6 | * Substantially rewritten to allowing for more general types of grid. |
7 | * (c) Lambros Lambrou 2008 |
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8 | * |
9 | * vim: set shiftwidth=4 :set textwidth=80: |
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10 | */ |
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11 | |
12 | /* |
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13 | * Possible future solver enhancements: |
14 | * |
15 | * - There's an interesting deductive technique which makes use |
16 | * of topology rather than just graph theory. Each _face_ in |
17 | * the grid is either inside or outside the loop; you can tell |
18 | * that two faces are on the same side of the loop if they're |
19 | * separated by a LINE_NO (or, more generally, by a path |
20 | * crossing no LINE_UNKNOWNs and an even number of LINE_YESes), |
21 | * and on the opposite side of the loop if they're separated by |
22 | * a LINE_YES (or an odd number of LINE_YESes and no |
23 | * LINE_UNKNOWNs). Oh, and any face separated from the outside |
24 | * of the grid by a LINE_YES or a LINE_NO is on the inside or |
25 | * outside respectively. So if you can track this for all |
26 | * faces, you figure out the state of the line between a pair |
27 | * once their relative insideness is known. |
28 | * + The way I envisage this working is simply to keep an edsf |
29 | * of all _faces_, which indicates whether they're on |
30 | * opposite sides of the loop from one another. We also |
31 | * include a special entry in the edsf for the infinite |
32 | * exterior "face". |
33 | * + So, the simple way to do this is to just go through the |
34 | * edges: every time we see an edge in a state other than |
35 | * LINE_UNKNOWN which separates two faces that aren't in the |
36 | * same edsf class, we can rectify that by merging the |
37 | * classes. Then, conversely, an edge in LINE_UNKNOWN state |
38 | * which separates two faces that _are_ in the same edsf |
39 | * class can immediately have its state determined. |
40 | * + But you can go one better, if you're prepared to loop |
41 | * over all _pairs_ of edges. Suppose we have edges A and B, |
42 | * which respectively separate faces A1,A2 and B1,B2. |
43 | * Suppose that A,B are in the same edge-edsf class and that |
44 | * A1,B1 (wlog) are in the same face-edsf class; then we can |
45 | * immediately place A2,B2 into the same face-edsf class (as |
46 | * each other, not as A1 and A2) one way round or the other. |
47 | * And conversely again, if A1,B1 are in the same face-edsf |
48 | * class and so are A2,B2, then we can put A,B into the same |
49 | * face-edsf class. |
50 | * * Of course, this deduction requires a quadratic-time |
51 | * loop over all pairs of edges in the grid, so it should |
52 | * be reserved until there's nothing easier left to be |
53 | * done. |
54 | * |
55 | * - The generalised grid support has made me (SGT) notice a |
56 | * possible extension to the loop-avoidance code. When you have |
57 | * a path of connected edges such that no other edges at all |
58 | * are incident on any vertex in the middle of the path - or, |
59 | * alternatively, such that any such edges are already known to |
60 | * be LINE_NO - then you know those edges are either all |
61 | * LINE_YES or all LINE_NO. Hence you can mentally merge the |
62 | * entire path into a single long curly edge for the purposes |
63 | * of loop avoidance, and look directly at whether or not the |
64 | * extreme endpoints of the path are connected by some other |
65 | * route. I find this coming up fairly often when I play on the |
66 | * octagonal grid setting, so it might be worth implementing in |
67 | * the solver. |
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68 | * |
69 | * - (Just a speed optimisation.) Consider some todo list queue where every |
70 | * time we modify something we mark it for consideration by other bits of |
71 | * the solver, to save iteration over things that have already been done. |
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72 | */ |
73 | |
74 | #include <stdio.h> |
75 | #include <stdlib.h> |
76 | #include <string.h> |
77 | #include <assert.h> |
78 | #include <ctype.h> |
79 | #include <math.h> |
80 | |
81 | #include "puzzles.h" |
82 | #include "tree234.h" |
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83 | #include "grid.h" |
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84 | |
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85 | /* Debugging options */ |
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86 | |
87 | /* |
88 | #define DEBUG_CACHES |
89 | #define SHOW_WORKING |
90 | #define DEBUG_DLINES |
91 | */ |
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92 | |
93 | /* ---------------------------------------------------------------------- |
94 | * Struct, enum and function declarations |
95 | */ |
96 | |
97 | enum { |
98 | COL_BACKGROUND, |
99 | COL_FOREGROUND, |
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100 | COL_LINEUNKNOWN, |
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101 | COL_HIGHLIGHT, |
102 | COL_MISTAKE, |
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103 | COL_SATISFIED, |
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104 | NCOLOURS |
105 | }; |
106 | |
107 | struct game_state { |
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108 | grid *game_grid; |
109 | |
110 | /* Put -1 in a face that doesn't get a clue */ |
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111 | signed char *clues; |
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112 | |
113 | /* Array of line states, to store whether each line is |
114 | * YES, NO or UNKNOWN */ |
115 | char *lines; |
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116 | |
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117 | unsigned char *line_errors; |
118 | |
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119 | int solved; |
120 | int cheated; |
121 | |
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122 | /* Used in game_text_format(), so that it knows what type of |
123 | * grid it's trying to render as ASCII text. */ |
124 | int grid_type; |
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125 | }; |
126 | |
127 | enum solver_status { |
128 | SOLVER_SOLVED, /* This is the only solution the solver could find */ |
129 | SOLVER_MISTAKE, /* This is definitely not a solution */ |
130 | SOLVER_AMBIGUOUS, /* This _might_ be an ambiguous solution */ |
131 | SOLVER_INCOMPLETE /* This may be a partial solution */ |
132 | }; |
133 | |
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134 | /* ------ Solver state ------ */ |
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135 | typedef struct normal { |
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136 | /* For each dline, store a bitmask for whether we know: |
137 | * (bit 0) at least one is YES |
138 | * (bit 1) at most one is YES */ |
139 | char *dlines; |
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140 | } normal_mode_state; |
141 | |
142 | typedef struct hard { |
143 | int *linedsf; |
144 | } hard_mode_state; |
145 | |
146 | typedef struct solver_state { |
147 | game_state *state; |
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148 | enum solver_status solver_status; |
149 | /* NB looplen is the number of dots that are joined together at a point, ie a |
150 | * looplen of 1 means there are no lines to a particular dot */ |
151 | int *looplen; |
152 | |
153 | /* caches */ |
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154 | char *dot_yes_count; |
155 | char *dot_no_count; |
156 | char *face_yes_count; |
157 | char *face_no_count; |
158 | char *dot_solved, *face_solved; |
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159 | int *dotdsf; |
160 | |
161 | normal_mode_state *normal; |
162 | hard_mode_state *hard; |
163 | } solver_state; |
164 | |
165 | /* |
166 | * Difficulty levels. I do some macro ickery here to ensure that my |
167 | * enum and the various forms of my name list always match up. |
168 | */ |
169 | |
170 | #define DIFFLIST(A) \ |
171 | A(EASY,Easy,e,easy_mode_deductions) \ |
172 | A(NORMAL,Normal,n,normal_mode_deductions) \ |
173 | A(HARD,Hard,h,hard_mode_deductions) |
174 | #define ENUM(upper,title,lower,fn) DIFF_ ## upper, |
175 | #define TITLE(upper,title,lower,fn) #title, |
176 | #define ENCODE(upper,title,lower,fn) #lower |
177 | #define CONFIG(upper,title,lower,fn) ":" #title |
178 | #define SOLVER_FN_DECL(upper,title,lower,fn) static int fn(solver_state *); |
179 | #define SOLVER_FN(upper,title,lower,fn) &fn, |
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180 | enum { DIFFLIST(ENUM) DIFF_MAX }; |
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181 | static char const *const diffnames[] = { DIFFLIST(TITLE) }; |
182 | static char const diffchars[] = DIFFLIST(ENCODE); |
183 | #define DIFFCONFIG DIFFLIST(CONFIG) |
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184 | DIFFLIST(SOLVER_FN_DECL) |
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185 | static int (*(solver_fns[]))(solver_state *) = { DIFFLIST(SOLVER_FN) }; |
186 | |
187 | struct game_params { |
188 | int w, h; |
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189 | int diff; |
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190 | int type; |
191 | |
192 | /* Grid generation is expensive, so keep a (ref-counted) reference to the |
193 | * grid for these parameters, and only generate when required. */ |
194 | grid *game_grid; |
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195 | }; |
196 | |
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197 | /* line_drawstate is the same as line_state, but with the extra ERROR |
198 | * possibility. The drawing code copies line_state to line_drawstate, |
199 | * except in the case that the line is an error. */ |
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200 | enum line_state { LINE_YES, LINE_UNKNOWN, LINE_NO }; |
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201 | enum line_drawstate { DS_LINE_YES, DS_LINE_UNKNOWN, |
202 | DS_LINE_NO, DS_LINE_ERROR }; |
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203 | |
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204 | #define OPP(line_state) \ |
205 | (2 - line_state) |
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206 | |
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207 | |
208 | struct game_drawstate { |
209 | int started; |
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210 | int tilesize; |
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211 | int flashing; |
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212 | char *lines; |
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213 | char *clue_error; |
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214 | char *clue_satisfied; |
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215 | }; |
216 | |
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217 | static char *validate_desc(game_params *params, char *desc); |
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218 | static int dot_order(const game_state* state, int i, char line_type); |
219 | static int face_order(const game_state* state, int i, char line_type); |
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220 | static solver_state *solve_game_rec(const solver_state *sstate, |
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221 | int diff); |
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222 | |
223 | #ifdef DEBUG_CACHES |
224 | static void check_caches(const solver_state* sstate); |
225 | #else |
226 | #define check_caches(s) |
227 | #endif |
228 | |
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229 | /* ------- List of grid generators ------- */ |
230 | #define GRIDLIST(A) \ |
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231 | A(Squares,grid_new_square,3,3) \ |
232 | A(Triangular,grid_new_triangular,3,3) \ |
233 | A(Honeycomb,grid_new_honeycomb,3,3) \ |
234 | A(Snub-Square,grid_new_snubsquare,3,3) \ |
235 | A(Cairo,grid_new_cairo,3,4) \ |
236 | A(Great-Hexagonal,grid_new_greathexagonal,3,3) \ |
237 | A(Octagonal,grid_new_octagonal,3,3) \ |
238 | A(Kites,grid_new_kites,3,3) |
239 | |
240 | #define GRID_NAME(title,fn,amin,omin) #title, |
241 | #define GRID_CONFIG(title,fn,amin,omin) ":" #title |
242 | #define GRID_FN(title,fn,amin,omin) &fn, |
243 | #define GRID_SIZES(title,fn,amin,omin) \ |
244 | {amin, omin, \ |
245 | "Width and height for this grid type must both be at least " #amin, \ |
246 | "At least one of width and height for this grid type must be at least " #omin,}, |
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247 | static char const *const gridnames[] = { GRIDLIST(GRID_NAME) }; |
248 | #define GRID_CONFIGS GRIDLIST(GRID_CONFIG) |
249 | static grid * (*(grid_fns[]))(int w, int h) = { GRIDLIST(GRID_FN) }; |
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250 | #define NUM_GRID_TYPES (sizeof(grid_fns) / sizeof(grid_fns[0])) |
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251 | static const struct { |
252 | int amin, omin; |
253 | char *aerr, *oerr; |
254 | } grid_size_limits[] = { GRIDLIST(GRID_SIZES) }; |
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255 | |
256 | /* Generates a (dynamically allocated) new grid, according to the |
257 | * type and size requested in params. Does nothing if the grid is already |
258 | * generated. The allocated grid is owned by the params object, and will be |
259 | * freed in free_params(). */ |
260 | static void params_generate_grid(game_params *params) |
261 | { |
262 | if (!params->game_grid) { |
263 | params->game_grid = grid_fns[params->type](params->w, params->h); |
264 | } |
265 | } |
266 | |
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267 | /* ---------------------------------------------------------------------- |
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268 | * Preprocessor magic |
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269 | */ |
270 | |
271 | /* General constants */ |
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272 | #define PREFERRED_TILE_SIZE 32 |
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273 | #define BORDER(tilesize) ((tilesize) / 2) |
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274 | #define FLASH_TIME 0.5F |
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275 | |
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276 | #define BIT_SET(field, bit) ((field) & (1<<(bit))) |
277 | |
278 | #define SET_BIT(field, bit) (BIT_SET(field, bit) ? FALSE : \ |
279 | ((field) |= (1<<(bit)), TRUE)) |
280 | |
281 | #define CLEAR_BIT(field, bit) (BIT_SET(field, bit) ? \ |
282 | ((field) &= ~(1<<(bit)), TRUE) : FALSE) |
283 | |
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284 | #define CLUE2CHAR(c) \ |
285 | ((c < 0) ? ' ' : c + '0') |
286 | |
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287 | /* ---------------------------------------------------------------------- |
288 | * General struct manipulation and other straightforward code |
289 | */ |
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290 | |
291 | static game_state *dup_game(game_state *state) |
292 | { |
293 | game_state *ret = snew(game_state); |
294 | |
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295 | ret->game_grid = state->game_grid; |
296 | ret->game_grid->refcount++; |
297 | |
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298 | ret->solved = state->solved; |
299 | ret->cheated = state->cheated; |
300 | |
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301 | ret->clues = snewn(state->game_grid->num_faces, signed char); |
302 | memcpy(ret->clues, state->clues, state->game_grid->num_faces); |
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303 | |
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304 | ret->lines = snewn(state->game_grid->num_edges, char); |
305 | memcpy(ret->lines, state->lines, state->game_grid->num_edges); |
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306 | |
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307 | ret->line_errors = snewn(state->game_grid->num_edges, unsigned char); |
308 | memcpy(ret->line_errors, state->line_errors, state->game_grid->num_edges); |
309 | |
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310 | ret->grid_type = state->grid_type; |
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311 | return ret; |
312 | } |
313 | |
314 | static void free_game(game_state *state) |
315 | { |
316 | if (state) { |
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317 | grid_free(state->game_grid); |
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318 | sfree(state->clues); |
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319 | sfree(state->lines); |
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320 | sfree(state->line_errors); |
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321 | sfree(state); |
322 | } |
323 | } |
324 | |
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325 | static solver_state *new_solver_state(game_state *state, int diff) { |
326 | int i; |
327 | int num_dots = state->game_grid->num_dots; |
328 | int num_faces = state->game_grid->num_faces; |
329 | int num_edges = state->game_grid->num_edges; |
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330 | solver_state *ret = snew(solver_state); |
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331 | |
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332 | ret->state = dup_game(state); |
333 | |
334 | ret->solver_status = SOLVER_INCOMPLETE; |
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335 | |
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336 | ret->dotdsf = snew_dsf(num_dots); |
337 | ret->looplen = snewn(num_dots, int); |
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338 | |
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339 | for (i = 0; i < num_dots; i++) { |
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340 | ret->looplen[i] = 1; |
341 | } |
342 | |
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343 | ret->dot_solved = snewn(num_dots, char); |
344 | ret->face_solved = snewn(num_faces, char); |
345 | memset(ret->dot_solved, FALSE, num_dots); |
346 | memset(ret->face_solved, FALSE, num_faces); |
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347 | |
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348 | ret->dot_yes_count = snewn(num_dots, char); |
349 | memset(ret->dot_yes_count, 0, num_dots); |
350 | ret->dot_no_count = snewn(num_dots, char); |
351 | memset(ret->dot_no_count, 0, num_dots); |
352 | ret->face_yes_count = snewn(num_faces, char); |
353 | memset(ret->face_yes_count, 0, num_faces); |
354 | ret->face_no_count = snewn(num_faces, char); |
355 | memset(ret->face_no_count, 0, num_faces); |
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356 | |
357 | if (diff < DIFF_NORMAL) { |
358 | ret->normal = NULL; |
359 | } else { |
360 | ret->normal = snew(normal_mode_state); |
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361 | ret->normal->dlines = snewn(2*num_edges, char); |
362 | memset(ret->normal->dlines, 0, 2*num_edges); |
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363 | } |
364 | |
365 | if (diff < DIFF_HARD) { |
366 | ret->hard = NULL; |
367 | } else { |
368 | ret->hard = snew(hard_mode_state); |
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369 | ret->hard->linedsf = snew_dsf(state->game_grid->num_edges); |
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370 | } |
371 | |
372 | return ret; |
373 | } |
374 | |
375 | static void free_solver_state(solver_state *sstate) { |
376 | if (sstate) { |
377 | free_game(sstate->state); |
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378 | sfree(sstate->dotdsf); |
379 | sfree(sstate->looplen); |
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380 | sfree(sstate->dot_solved); |
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381 | sfree(sstate->face_solved); |
382 | sfree(sstate->dot_yes_count); |
383 | sfree(sstate->dot_no_count); |
384 | sfree(sstate->face_yes_count); |
385 | sfree(sstate->face_no_count); |
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386 | |
387 | if (sstate->normal) { |
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388 | sfree(sstate->normal->dlines); |
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389 | sfree(sstate->normal); |
390 | } |
391 | |
392 | if (sstate->hard) { |
393 | sfree(sstate->hard->linedsf); |
394 | sfree(sstate->hard); |
395 | } |
396 | |
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397 | sfree(sstate); |
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398 | } |
399 | } |
400 | |
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401 | static solver_state *dup_solver_state(const solver_state *sstate) { |
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402 | game_state *state = sstate->state; |
403 | int num_dots = state->game_grid->num_dots; |
404 | int num_faces = state->game_grid->num_faces; |
405 | int num_edges = state->game_grid->num_edges; |
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406 | solver_state *ret = snew(solver_state); |
407 | |
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408 | ret->state = state = dup_game(sstate->state); |
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409 | |
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410 | ret->solver_status = sstate->solver_status; |
411 | |
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412 | ret->dotdsf = snewn(num_dots, int); |
413 | ret->looplen = snewn(num_dots, int); |
414 | memcpy(ret->dotdsf, sstate->dotdsf, |
415 | num_dots * sizeof(int)); |
416 | memcpy(ret->looplen, sstate->looplen, |
417 | num_dots * sizeof(int)); |
418 | |
419 | ret->dot_solved = snewn(num_dots, char); |
420 | ret->face_solved = snewn(num_faces, char); |
421 | memcpy(ret->dot_solved, sstate->dot_solved, num_dots); |
422 | memcpy(ret->face_solved, sstate->face_solved, num_faces); |
423 | |
424 | ret->dot_yes_count = snewn(num_dots, char); |
425 | memcpy(ret->dot_yes_count, sstate->dot_yes_count, num_dots); |
426 | ret->dot_no_count = snewn(num_dots, char); |
427 | memcpy(ret->dot_no_count, sstate->dot_no_count, num_dots); |
428 | |
429 | ret->face_yes_count = snewn(num_faces, char); |
430 | memcpy(ret->face_yes_count, sstate->face_yes_count, num_faces); |
431 | ret->face_no_count = snewn(num_faces, char); |
432 | memcpy(ret->face_no_count, sstate->face_no_count, num_faces); |
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433 | |
434 | if (sstate->normal) { |
435 | ret->normal = snew(normal_mode_state); |
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436 | ret->normal->dlines = snewn(2*num_edges, char); |
437 | memcpy(ret->normal->dlines, sstate->normal->dlines, |
438 | 2*num_edges); |
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439 | } else { |
440 | ret->normal = NULL; |
441 | } |
442 | |
443 | if (sstate->hard) { |
444 | ret->hard = snew(hard_mode_state); |
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445 | ret->hard->linedsf = snewn(num_edges, int); |
446 | memcpy(ret->hard->linedsf, sstate->hard->linedsf, |
447 | num_edges * sizeof(int)); |
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448 | } else { |
449 | ret->hard = NULL; |
450 | } |
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451 | |
452 | return ret; |
453 | } |
454 | |
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455 | static game_params *default_params(void) |
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456 | { |
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457 | game_params *ret = snew(game_params); |
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458 | |
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459 | #ifdef SLOW_SYSTEM |
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460 | ret->h = 7; |
461 | ret->w = 7; |
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462 | #else |
463 | ret->h = 10; |
464 | ret->w = 10; |
465 | #endif |
466 | ret->diff = DIFF_EASY; |
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467 | ret->type = 0; |
468 | |
469 | ret->game_grid = NULL; |
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470 | |
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471 | return ret; |
6193da8d |
472 | } |
473 | |
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474 | static game_params *dup_params(game_params *params) |
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475 | { |
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476 | game_params *ret = snew(game_params); |
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477 | |
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478 | *ret = *params; /* structure copy */ |
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479 | if (ret->game_grid) { |
480 | ret->game_grid->refcount++; |
481 | } |
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482 | return ret; |
483 | } |
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484 | |
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485 | static const game_params presets[] = { |
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486 | #ifdef SMALL_SCREEN |
487 | { 7, 7, DIFF_EASY, 0, NULL }, |
488 | { 7, 7, DIFF_NORMAL, 0, NULL }, |
489 | { 7, 7, DIFF_HARD, 0, NULL }, |
490 | { 7, 7, DIFF_HARD, 1, NULL }, |
491 | { 7, 7, DIFF_HARD, 2, NULL }, |
492 | { 5, 5, DIFF_HARD, 3, NULL }, |
493 | { 7, 7, DIFF_HARD, 4, NULL }, |
494 | { 5, 4, DIFF_HARD, 5, NULL }, |
495 | { 5, 5, DIFF_HARD, 6, NULL }, |
496 | { 5, 5, DIFF_HARD, 7, NULL }, |
497 | #else |
7c95608a |
498 | { 7, 7, DIFF_EASY, 0, NULL }, |
499 | { 10, 10, DIFF_EASY, 0, NULL }, |
500 | { 7, 7, DIFF_NORMAL, 0, NULL }, |
501 | { 10, 10, DIFF_NORMAL, 0, NULL }, |
502 | { 7, 7, DIFF_HARD, 0, NULL }, |
503 | { 10, 10, DIFF_HARD, 0, NULL }, |
504 | { 10, 10, DIFF_HARD, 1, NULL }, |
505 | { 12, 10, DIFF_HARD, 2, NULL }, |
506 | { 7, 7, DIFF_HARD, 3, NULL }, |
507 | { 9, 9, DIFF_HARD, 4, NULL }, |
508 | { 5, 4, DIFF_HARD, 5, NULL }, |
509 | { 7, 7, DIFF_HARD, 6, NULL }, |
510 | { 5, 5, DIFF_HARD, 7, NULL }, |
b1535c90 |
511 | #endif |
121aae4b |
512 | }; |
6193da8d |
513 | |
121aae4b |
514 | static int game_fetch_preset(int i, char **name, game_params **params) |
6193da8d |
515 | { |
1a739e2f |
516 | game_params *tmppar; |
121aae4b |
517 | char buf[80]; |
6193da8d |
518 | |
121aae4b |
519 | if (i < 0 || i >= lenof(presets)) |
520 | return FALSE; |
6193da8d |
521 | |
1a739e2f |
522 | tmppar = snew(game_params); |
523 | *tmppar = presets[i]; |
524 | *params = tmppar; |
7c95608a |
525 | sprintf(buf, "%dx%d %s - %s", tmppar->h, tmppar->w, |
526 | gridnames[tmppar->type], diffnames[tmppar->diff]); |
121aae4b |
527 | *name = dupstr(buf); |
528 | |
529 | return TRUE; |
6193da8d |
530 | } |
531 | |
532 | static void free_params(game_params *params) |
533 | { |
7c95608a |
534 | if (params->game_grid) { |
535 | grid_free(params->game_grid); |
536 | } |
6193da8d |
537 | sfree(params); |
538 | } |
539 | |
540 | static void decode_params(game_params *params, char const *string) |
541 | { |
7c95608a |
542 | if (params->game_grid) { |
543 | grid_free(params->game_grid); |
544 | params->game_grid = NULL; |
545 | } |
6193da8d |
546 | params->h = params->w = atoi(string); |
c0eb17ce |
547 | params->diff = DIFF_EASY; |
6193da8d |
548 | while (*string && isdigit((unsigned char)*string)) string++; |
549 | if (*string == 'x') { |
550 | string++; |
551 | params->h = atoi(string); |
121aae4b |
552 | while (*string && isdigit((unsigned char)*string)) string++; |
6193da8d |
553 | } |
7c95608a |
554 | if (*string == 't') { |
6193da8d |
555 | string++; |
7c95608a |
556 | params->type = atoi(string); |
121aae4b |
557 | while (*string && isdigit((unsigned char)*string)) string++; |
6193da8d |
558 | } |
c0eb17ce |
559 | if (*string == 'd') { |
560 | int i; |
c0eb17ce |
561 | string++; |
121aae4b |
562 | for (i = 0; i < DIFF_MAX; i++) |
563 | if (*string == diffchars[i]) |
564 | params->diff = i; |
565 | if (*string) string++; |
c0eb17ce |
566 | } |
6193da8d |
567 | } |
568 | |
569 | static char *encode_params(game_params *params, int full) |
570 | { |
571 | char str[80]; |
7c95608a |
572 | sprintf(str, "%dx%dt%d", params->w, params->h, params->type); |
6193da8d |
573 | if (full) |
7c95608a |
574 | sprintf(str + strlen(str), "d%c", diffchars[params->diff]); |
6193da8d |
575 | return dupstr(str); |
576 | } |
577 | |
578 | static config_item *game_configure(game_params *params) |
579 | { |
580 | config_item *ret; |
581 | char buf[80]; |
582 | |
7c95608a |
583 | ret = snewn(5, config_item); |
6193da8d |
584 | |
585 | ret[0].name = "Width"; |
586 | ret[0].type = C_STRING; |
587 | sprintf(buf, "%d", params->w); |
588 | ret[0].sval = dupstr(buf); |
589 | ret[0].ival = 0; |
590 | |
591 | ret[1].name = "Height"; |
592 | ret[1].type = C_STRING; |
593 | sprintf(buf, "%d", params->h); |
594 | ret[1].sval = dupstr(buf); |
595 | ret[1].ival = 0; |
596 | |
7c95608a |
597 | ret[2].name = "Grid type"; |
c0eb17ce |
598 | ret[2].type = C_CHOICES; |
7c95608a |
599 | ret[2].sval = GRID_CONFIGS; |
600 | ret[2].ival = params->type; |
6193da8d |
601 | |
7c95608a |
602 | ret[3].name = "Difficulty"; |
603 | ret[3].type = C_CHOICES; |
604 | ret[3].sval = DIFFCONFIG; |
605 | ret[3].ival = params->diff; |
606 | |
607 | ret[4].name = NULL; |
608 | ret[4].type = C_END; |
609 | ret[4].sval = NULL; |
610 | ret[4].ival = 0; |
6193da8d |
611 | |
612 | return ret; |
613 | } |
614 | |
615 | static game_params *custom_params(config_item *cfg) |
616 | { |
617 | game_params *ret = snew(game_params); |
618 | |
619 | ret->w = atoi(cfg[0].sval); |
620 | ret->h = atoi(cfg[1].sval); |
7c95608a |
621 | ret->type = cfg[2].ival; |
622 | ret->diff = cfg[3].ival; |
6193da8d |
623 | |
7c95608a |
624 | ret->game_grid = NULL; |
6193da8d |
625 | return ret; |
626 | } |
627 | |
628 | static char *validate_params(game_params *params, int full) |
629 | { |
7c95608a |
630 | if (params->type < 0 || params->type >= NUM_GRID_TYPES) |
631 | return "Illegal grid type"; |
e3c9e042 |
632 | if (params->w < grid_size_limits[params->type].amin || |
633 | params->h < grid_size_limits[params->type].amin) |
634 | return grid_size_limits[params->type].aerr; |
635 | if (params->w < grid_size_limits[params->type].omin && |
636 | params->h < grid_size_limits[params->type].omin) |
637 | return grid_size_limits[params->type].oerr; |
c0eb17ce |
638 | |
639 | /* |
640 | * This shouldn't be able to happen at all, since decode_params |
641 | * and custom_params will never generate anything that isn't |
642 | * within range. |
643 | */ |
1a739e2f |
644 | assert(params->diff < DIFF_MAX); |
c0eb17ce |
645 | |
6193da8d |
646 | return NULL; |
647 | } |
648 | |
121aae4b |
649 | /* Returns a newly allocated string describing the current puzzle */ |
650 | static char *state_to_text(const game_state *state) |
6193da8d |
651 | { |
7c95608a |
652 | grid *g = state->game_grid; |
121aae4b |
653 | char *retval; |
7c95608a |
654 | int num_faces = g->num_faces; |
655 | char *description = snewn(num_faces + 1, char); |
121aae4b |
656 | char *dp = description; |
657 | int empty_count = 0; |
7c95608a |
658 | int i; |
6193da8d |
659 | |
7c95608a |
660 | for (i = 0; i < num_faces; i++) { |
661 | if (state->clues[i] < 0) { |
121aae4b |
662 | if (empty_count > 25) { |
663 | dp += sprintf(dp, "%c", (int)(empty_count + 'a' - 1)); |
664 | empty_count = 0; |
665 | } |
666 | empty_count++; |
667 | } else { |
668 | if (empty_count) { |
669 | dp += sprintf(dp, "%c", (int)(empty_count + 'a' - 1)); |
670 | empty_count = 0; |
671 | } |
7c95608a |
672 | dp += sprintf(dp, "%c", (int)CLUE2CHAR(state->clues[i])); |
121aae4b |
673 | } |
674 | } |
6193da8d |
675 | |
121aae4b |
676 | if (empty_count) |
1a739e2f |
677 | dp += sprintf(dp, "%c", (int)(empty_count + 'a' - 1)); |
121aae4b |
678 | |
679 | retval = dupstr(description); |
680 | sfree(description); |
681 | |
682 | return retval; |
6193da8d |
683 | } |
684 | |
121aae4b |
685 | /* We require that the params pass the test in validate_params and that the |
686 | * description fills the entire game area */ |
687 | static char *validate_desc(game_params *params, char *desc) |
6193da8d |
688 | { |
121aae4b |
689 | int count = 0; |
7c95608a |
690 | grid *g; |
691 | params_generate_grid(params); |
692 | g = params->game_grid; |
6193da8d |
693 | |
121aae4b |
694 | for (; *desc; ++desc) { |
695 | if (*desc >= '0' && *desc <= '9') { |
696 | count++; |
697 | continue; |
698 | } |
699 | if (*desc >= 'a') { |
700 | count += *desc - 'a' + 1; |
701 | continue; |
702 | } |
703 | return "Unknown character in description"; |
6193da8d |
704 | } |
705 | |
7c95608a |
706 | if (count < g->num_faces) |
121aae4b |
707 | return "Description too short for board size"; |
7c95608a |
708 | if (count > g->num_faces) |
121aae4b |
709 | return "Description too long for board size"; |
6193da8d |
710 | |
121aae4b |
711 | return NULL; |
6193da8d |
712 | } |
713 | |
121aae4b |
714 | /* Sums the lengths of the numbers in range [0,n) */ |
715 | /* See equivalent function in solo.c for justification of this. */ |
716 | static int len_0_to_n(int n) |
6193da8d |
717 | { |
121aae4b |
718 | int len = 1; /* Counting 0 as a bit of a special case */ |
719 | int i; |
720 | |
721 | for (i = 1; i < n; i *= 10) { |
722 | len += max(n - i, 0); |
6193da8d |
723 | } |
121aae4b |
724 | |
725 | return len; |
6193da8d |
726 | } |
727 | |
121aae4b |
728 | static char *encode_solve_move(const game_state *state) |
729 | { |
7c95608a |
730 | int len; |
121aae4b |
731 | char *ret, *p; |
7c95608a |
732 | int i; |
733 | int num_edges = state->game_grid->num_edges; |
734 | |
121aae4b |
735 | /* This is going to return a string representing the moves needed to set |
736 | * every line in a grid to be the same as the ones in 'state'. The exact |
737 | * length of this string is predictable. */ |
6193da8d |
738 | |
121aae4b |
739 | len = 1; /* Count the 'S' prefix */ |
7c95608a |
740 | /* Numbers in all lines */ |
741 | len += len_0_to_n(num_edges); |
742 | /* For each line we also have a letter */ |
743 | len += num_edges; |
6193da8d |
744 | |
121aae4b |
745 | ret = snewn(len + 1, char); |
746 | p = ret; |
6193da8d |
747 | |
121aae4b |
748 | p += sprintf(p, "S"); |
6193da8d |
749 | |
7c95608a |
750 | for (i = 0; i < num_edges; i++) { |
751 | switch (state->lines[i]) { |
752 | case LINE_YES: |
753 | p += sprintf(p, "%dy", i); |
754 | break; |
755 | case LINE_NO: |
756 | p += sprintf(p, "%dn", i); |
757 | break; |
6193da8d |
758 | } |
6193da8d |
759 | } |
121aae4b |
760 | |
761 | /* No point in doing sums like that if they're going to be wrong */ |
762 | assert(strlen(ret) <= (size_t)len); |
763 | return ret; |
6193da8d |
764 | } |
765 | |
121aae4b |
766 | static game_ui *new_ui(game_state *state) |
6193da8d |
767 | { |
121aae4b |
768 | return NULL; |
769 | } |
6193da8d |
770 | |
121aae4b |
771 | static void free_ui(game_ui *ui) |
772 | { |
773 | } |
6193da8d |
774 | |
121aae4b |
775 | static char *encode_ui(game_ui *ui) |
776 | { |
777 | return NULL; |
778 | } |
6193da8d |
779 | |
121aae4b |
780 | static void decode_ui(game_ui *ui, char *encoding) |
781 | { |
782 | } |
6193da8d |
783 | |
121aae4b |
784 | static void game_changed_state(game_ui *ui, game_state *oldstate, |
785 | game_state *newstate) |
786 | { |
787 | } |
6193da8d |
788 | |
121aae4b |
789 | static void game_compute_size(game_params *params, int tilesize, |
790 | int *x, int *y) |
791 | { |
7c95608a |
792 | grid *g; |
1515b973 |
793 | int grid_width, grid_height, rendered_width, rendered_height; |
794 | |
7c95608a |
795 | params_generate_grid(params); |
796 | g = params->game_grid; |
1515b973 |
797 | grid_width = g->highest_x - g->lowest_x; |
798 | grid_height = g->highest_y - g->lowest_y; |
7c95608a |
799 | /* multiply first to minimise rounding error on integer division */ |
1515b973 |
800 | rendered_width = grid_width * tilesize / g->tilesize; |
801 | rendered_height = grid_height * tilesize / g->tilesize; |
7c95608a |
802 | *x = rendered_width + 2 * BORDER(tilesize) + 1; |
803 | *y = rendered_height + 2 * BORDER(tilesize) + 1; |
121aae4b |
804 | } |
6193da8d |
805 | |
121aae4b |
806 | static void game_set_size(drawing *dr, game_drawstate *ds, |
7c95608a |
807 | game_params *params, int tilesize) |
121aae4b |
808 | { |
809 | ds->tilesize = tilesize; |
121aae4b |
810 | } |
6193da8d |
811 | |
121aae4b |
812 | static float *game_colours(frontend *fe, int *ncolours) |
813 | { |
814 | float *ret = snewn(4 * NCOLOURS, float); |
6193da8d |
815 | |
121aae4b |
816 | frontend_default_colour(fe, &ret[COL_BACKGROUND * 3]); |
817 | |
818 | ret[COL_FOREGROUND * 3 + 0] = 0.0F; |
819 | ret[COL_FOREGROUND * 3 + 1] = 0.0F; |
820 | ret[COL_FOREGROUND * 3 + 2] = 0.0F; |
821 | |
7c95608a |
822 | ret[COL_LINEUNKNOWN * 3 + 0] = 0.8F; |
823 | ret[COL_LINEUNKNOWN * 3 + 1] = 0.8F; |
824 | ret[COL_LINEUNKNOWN * 3 + 2] = 0.0F; |
825 | |
121aae4b |
826 | ret[COL_HIGHLIGHT * 3 + 0] = 1.0F; |
827 | ret[COL_HIGHLIGHT * 3 + 1] = 1.0F; |
828 | ret[COL_HIGHLIGHT * 3 + 2] = 1.0F; |
829 | |
830 | ret[COL_MISTAKE * 3 + 0] = 1.0F; |
831 | ret[COL_MISTAKE * 3 + 1] = 0.0F; |
832 | ret[COL_MISTAKE * 3 + 2] = 0.0F; |
833 | |
7c95608a |
834 | ret[COL_SATISFIED * 3 + 0] = 0.0F; |
835 | ret[COL_SATISFIED * 3 + 1] = 0.0F; |
836 | ret[COL_SATISFIED * 3 + 2] = 0.0F; |
837 | |
121aae4b |
838 | *ncolours = NCOLOURS; |
839 | return ret; |
840 | } |
841 | |
842 | static game_drawstate *game_new_drawstate(drawing *dr, game_state *state) |
843 | { |
844 | struct game_drawstate *ds = snew(struct game_drawstate); |
7c95608a |
845 | int num_faces = state->game_grid->num_faces; |
846 | int num_edges = state->game_grid->num_edges; |
121aae4b |
847 | |
7c95608a |
848 | ds->tilesize = 0; |
121aae4b |
849 | ds->started = 0; |
7c95608a |
850 | ds->lines = snewn(num_edges, char); |
851 | ds->clue_error = snewn(num_faces, char); |
852 | ds->clue_satisfied = snewn(num_faces, char); |
121aae4b |
853 | ds->flashing = 0; |
854 | |
7c95608a |
855 | memset(ds->lines, LINE_UNKNOWN, num_edges); |
856 | memset(ds->clue_error, 0, num_faces); |
857 | memset(ds->clue_satisfied, 0, num_faces); |
121aae4b |
858 | |
859 | return ds; |
860 | } |
861 | |
862 | static void game_free_drawstate(drawing *dr, game_drawstate *ds) |
863 | { |
864 | sfree(ds->clue_error); |
7c95608a |
865 | sfree(ds->clue_satisfied); |
866 | sfree(ds->lines); |
121aae4b |
867 | sfree(ds); |
868 | } |
869 | |
870 | static int game_timing_state(game_state *state, game_ui *ui) |
871 | { |
872 | return TRUE; |
873 | } |
874 | |
875 | static float game_anim_length(game_state *oldstate, game_state *newstate, |
876 | int dir, game_ui *ui) |
877 | { |
878 | return 0.0F; |
879 | } |
880 | |
7c95608a |
881 | static int game_can_format_as_text_now(game_params *params) |
882 | { |
883 | if (params->type != 0) |
884 | return FALSE; |
885 | return TRUE; |
886 | } |
887 | |
121aae4b |
888 | static char *game_text_format(game_state *state) |
889 | { |
7c95608a |
890 | int w, h, W, H; |
891 | int x, y, i; |
892 | int cell_size; |
893 | char *ret; |
894 | grid *g = state->game_grid; |
895 | grid_face *f; |
896 | |
897 | assert(state->grid_type == 0); |
898 | |
899 | /* Work out the basic size unit */ |
900 | f = g->faces; /* first face */ |
901 | assert(f->order == 4); |
902 | /* The dots are ordered clockwise, so the two opposite |
903 | * corners are guaranteed to span the square */ |
904 | cell_size = abs(f->dots[0]->x - f->dots[2]->x); |
905 | |
906 | w = (g->highest_x - g->lowest_x) / cell_size; |
907 | h = (g->highest_y - g->lowest_y) / cell_size; |
908 | |
909 | /* Create a blank "canvas" to "draw" on */ |
910 | W = 2 * w + 2; |
911 | H = 2 * h + 1; |
912 | ret = snewn(W * H + 1, char); |
913 | for (y = 0; y < H; y++) { |
914 | for (x = 0; x < W-1; x++) { |
915 | ret[y*W + x] = ' '; |
121aae4b |
916 | } |
7c95608a |
917 | ret[y*W + W-1] = '\n'; |
918 | } |
919 | ret[H*W] = '\0'; |
920 | |
921 | /* Fill in edge info */ |
922 | for (i = 0; i < g->num_edges; i++) { |
923 | grid_edge *e = g->edges + i; |
924 | /* Cell coordinates, from (0,0) to (w-1,h-1) */ |
925 | int x1 = (e->dot1->x - g->lowest_x) / cell_size; |
926 | int x2 = (e->dot2->x - g->lowest_x) / cell_size; |
927 | int y1 = (e->dot1->y - g->lowest_y) / cell_size; |
928 | int y2 = (e->dot2->y - g->lowest_y) / cell_size; |
929 | /* Midpoint, in canvas coordinates (canvas coordinates are just twice |
930 | * cell coordinates) */ |
931 | x = x1 + x2; |
932 | y = y1 + y2; |
933 | switch (state->lines[i]) { |
934 | case LINE_YES: |
935 | ret[y*W + x] = (y1 == y2) ? '-' : '|'; |
936 | break; |
937 | case LINE_NO: |
938 | ret[y*W + x] = 'x'; |
939 | break; |
940 | case LINE_UNKNOWN: |
941 | break; /* already a space */ |
942 | default: |
943 | assert(!"Illegal line state"); |
121aae4b |
944 | } |
121aae4b |
945 | } |
7c95608a |
946 | |
947 | /* Fill in clues */ |
948 | for (i = 0; i < g->num_faces; i++) { |
1515b973 |
949 | int x1, x2, y1, y2; |
950 | |
7c95608a |
951 | f = g->faces + i; |
952 | assert(f->order == 4); |
953 | /* Cell coordinates, from (0,0) to (w-1,h-1) */ |
1515b973 |
954 | x1 = (f->dots[0]->x - g->lowest_x) / cell_size; |
955 | x2 = (f->dots[2]->x - g->lowest_x) / cell_size; |
956 | y1 = (f->dots[0]->y - g->lowest_y) / cell_size; |
957 | y2 = (f->dots[2]->y - g->lowest_y) / cell_size; |
7c95608a |
958 | /* Midpoint, in canvas coordinates */ |
959 | x = x1 + x2; |
960 | y = y1 + y2; |
961 | ret[y*W + x] = CLUE2CHAR(state->clues[i]); |
121aae4b |
962 | } |
121aae4b |
963 | return ret; |
964 | } |
965 | |
966 | /* ---------------------------------------------------------------------- |
967 | * Debug code |
968 | */ |
969 | |
970 | #ifdef DEBUG_CACHES |
971 | static void check_caches(const solver_state* sstate) |
972 | { |
7c95608a |
973 | int i; |
121aae4b |
974 | const game_state *state = sstate->state; |
7c95608a |
975 | const grid *g = state->game_grid; |
121aae4b |
976 | |
7c95608a |
977 | for (i = 0; i < g->num_dots; i++) { |
978 | assert(dot_order(state, i, LINE_YES) == sstate->dot_yes_count[i]); |
979 | assert(dot_order(state, i, LINE_NO) == sstate->dot_no_count[i]); |
121aae4b |
980 | } |
981 | |
7c95608a |
982 | for (i = 0; i < g->num_faces; i++) { |
983 | assert(face_order(state, i, LINE_YES) == sstate->face_yes_count[i]); |
984 | assert(face_order(state, i, LINE_NO) == sstate->face_no_count[i]); |
121aae4b |
985 | } |
986 | } |
987 | |
988 | #if 0 |
989 | #define check_caches(s) \ |
990 | do { \ |
991 | fprintf(stderr, "check_caches at line %d\n", __LINE__); \ |
992 | check_caches(s); \ |
993 | } while (0) |
994 | #endif |
995 | #endif /* DEBUG_CACHES */ |
996 | |
997 | /* ---------------------------------------------------------------------- |
998 | * Solver utility functions |
999 | */ |
1000 | |
7c95608a |
1001 | /* Sets the line (with index i) to the new state 'line_new', and updates |
1002 | * the cached counts of any affected faces and dots. |
1003 | * Returns TRUE if this actually changed the line's state. */ |
1004 | static int solver_set_line(solver_state *sstate, int i, |
1005 | enum line_state line_new |
121aae4b |
1006 | #ifdef SHOW_WORKING |
7c95608a |
1007 | , const char *reason |
121aae4b |
1008 | #endif |
7c95608a |
1009 | ) |
121aae4b |
1010 | { |
1011 | game_state *state = sstate->state; |
7c95608a |
1012 | grid *g; |
1013 | grid_edge *e; |
121aae4b |
1014 | |
1015 | assert(line_new != LINE_UNKNOWN); |
1016 | |
1017 | check_caches(sstate); |
1018 | |
7c95608a |
1019 | if (state->lines[i] == line_new) { |
1020 | return FALSE; /* nothing changed */ |
121aae4b |
1021 | } |
7c95608a |
1022 | state->lines[i] = line_new; |
121aae4b |
1023 | |
1024 | #ifdef SHOW_WORKING |
7c95608a |
1025 | fprintf(stderr, "solver: set line [%d] to %s (%s)\n", |
1026 | i, line_new == LINE_YES ? "YES" : "NO", |
121aae4b |
1027 | reason); |
1028 | #endif |
1029 | |
7c95608a |
1030 | g = state->game_grid; |
1031 | e = g->edges + i; |
1032 | |
1033 | /* Update the cache for both dots and both faces affected by this. */ |
121aae4b |
1034 | if (line_new == LINE_YES) { |
7c95608a |
1035 | sstate->dot_yes_count[e->dot1 - g->dots]++; |
1036 | sstate->dot_yes_count[e->dot2 - g->dots]++; |
1037 | if (e->face1) { |
1038 | sstate->face_yes_count[e->face1 - g->faces]++; |
1039 | } |
1040 | if (e->face2) { |
1041 | sstate->face_yes_count[e->face2 - g->faces]++; |
1042 | } |
121aae4b |
1043 | } else { |
7c95608a |
1044 | sstate->dot_no_count[e->dot1 - g->dots]++; |
1045 | sstate->dot_no_count[e->dot2 - g->dots]++; |
1046 | if (e->face1) { |
1047 | sstate->face_no_count[e->face1 - g->faces]++; |
1048 | } |
1049 | if (e->face2) { |
1050 | sstate->face_no_count[e->face2 - g->faces]++; |
1051 | } |
1052 | } |
1053 | |
121aae4b |
1054 | check_caches(sstate); |
7c95608a |
1055 | return TRUE; |
121aae4b |
1056 | } |
1057 | |
1058 | #ifdef SHOW_WORKING |
7c95608a |
1059 | #define solver_set_line(a, b, c) \ |
1060 | solver_set_line(a, b, c, __FUNCTION__) |
121aae4b |
1061 | #endif |
1062 | |
1063 | /* |
1064 | * Merge two dots due to the existence of an edge between them. |
1065 | * Updates the dsf tracking equivalence classes, and keeps track of |
1066 | * the length of path each dot is currently a part of. |
1067 | * Returns TRUE if the dots were already linked, ie if they are part of a |
1068 | * closed loop, and false otherwise. |
1069 | */ |
7c95608a |
1070 | static int merge_dots(solver_state *sstate, int edge_index) |
121aae4b |
1071 | { |
1072 | int i, j, len; |
7c95608a |
1073 | grid *g = sstate->state->game_grid; |
1074 | grid_edge *e = g->edges + edge_index; |
121aae4b |
1075 | |
7c95608a |
1076 | i = e->dot1 - g->dots; |
1077 | j = e->dot2 - g->dots; |
121aae4b |
1078 | |
1079 | i = dsf_canonify(sstate->dotdsf, i); |
1080 | j = dsf_canonify(sstate->dotdsf, j); |
1081 | |
1082 | if (i == j) { |
1083 | return TRUE; |
1084 | } else { |
1085 | len = sstate->looplen[i] + sstate->looplen[j]; |
1086 | dsf_merge(sstate->dotdsf, i, j); |
1087 | i = dsf_canonify(sstate->dotdsf, i); |
1088 | sstate->looplen[i] = len; |
1089 | return FALSE; |
1090 | } |
1091 | } |
1092 | |
121aae4b |
1093 | /* Merge two lines because the solver has deduced that they must be either |
1094 | * identical or opposite. Returns TRUE if this is new information, otherwise |
1095 | * FALSE. */ |
7c95608a |
1096 | static int merge_lines(solver_state *sstate, int i, int j, int inverse |
121aae4b |
1097 | #ifdef SHOW_WORKING |
1098 | , const char *reason |
1099 | #endif |
7c95608a |
1100 | ) |
121aae4b |
1101 | { |
7c95608a |
1102 | int inv_tmp; |
121aae4b |
1103 | |
7c95608a |
1104 | assert(i < sstate->state->game_grid->num_edges); |
1105 | assert(j < sstate->state->game_grid->num_edges); |
121aae4b |
1106 | |
121aae4b |
1107 | i = edsf_canonify(sstate->hard->linedsf, i, &inv_tmp); |
1108 | inverse ^= inv_tmp; |
1109 | j = edsf_canonify(sstate->hard->linedsf, j, &inv_tmp); |
1110 | inverse ^= inv_tmp; |
1111 | |
1112 | edsf_merge(sstate->hard->linedsf, i, j, inverse); |
1113 | |
1114 | #ifdef SHOW_WORKING |
1115 | if (i != j) { |
7c95608a |
1116 | fprintf(stderr, "%s [%d] [%d] %s(%s)\n", |
1117 | __FUNCTION__, i, j, |
121aae4b |
1118 | inverse ? "inverse " : "", reason); |
1119 | } |
1120 | #endif |
1121 | return (i != j); |
1122 | } |
1123 | |
1124 | #ifdef SHOW_WORKING |
7c95608a |
1125 | #define merge_lines(a, b, c, d) \ |
1126 | merge_lines(a, b, c, d, __FUNCTION__) |
121aae4b |
1127 | #endif |
1128 | |
1129 | /* Count the number of lines of a particular type currently going into the |
7c95608a |
1130 | * given dot. */ |
1131 | static int dot_order(const game_state* state, int dot, char line_type) |
121aae4b |
1132 | { |
1133 | int n = 0; |
7c95608a |
1134 | grid *g = state->game_grid; |
1135 | grid_dot *d = g->dots + dot; |
1136 | int i; |
121aae4b |
1137 | |
7c95608a |
1138 | for (i = 0; i < d->order; i++) { |
1139 | grid_edge *e = d->edges[i]; |
1140 | if (state->lines[e - g->edges] == line_type) |
121aae4b |
1141 | ++n; |
1142 | } |
121aae4b |
1143 | return n; |
1144 | } |
1145 | |
1146 | /* Count the number of lines of a particular type currently surrounding the |
7c95608a |
1147 | * given face */ |
1148 | static int face_order(const game_state* state, int face, char line_type) |
121aae4b |
1149 | { |
1150 | int n = 0; |
7c95608a |
1151 | grid *g = state->game_grid; |
1152 | grid_face *f = g->faces + face; |
1153 | int i; |
121aae4b |
1154 | |
7c95608a |
1155 | for (i = 0; i < f->order; i++) { |
1156 | grid_edge *e = f->edges[i]; |
1157 | if (state->lines[e - g->edges] == line_type) |
1158 | ++n; |
1159 | } |
121aae4b |
1160 | return n; |
1161 | } |
1162 | |
7c95608a |
1163 | /* Set all lines bordering a dot of type old_type to type new_type |
121aae4b |
1164 | * Return value tells caller whether this function actually did anything */ |
7c95608a |
1165 | static int dot_setall(solver_state *sstate, int dot, |
1166 | char old_type, char new_type) |
121aae4b |
1167 | { |
1168 | int retval = FALSE, r; |
1169 | game_state *state = sstate->state; |
7c95608a |
1170 | grid *g; |
1171 | grid_dot *d; |
1172 | int i; |
1173 | |
121aae4b |
1174 | if (old_type == new_type) |
1175 | return FALSE; |
1176 | |
7c95608a |
1177 | g = state->game_grid; |
1178 | d = g->dots + dot; |
121aae4b |
1179 | |
7c95608a |
1180 | for (i = 0; i < d->order; i++) { |
1181 | int line_index = d->edges[i] - g->edges; |
1182 | if (state->lines[line_index] == old_type) { |
1183 | r = solver_set_line(sstate, line_index, new_type); |
1184 | assert(r == TRUE); |
1185 | retval = TRUE; |
1186 | } |
121aae4b |
1187 | } |
121aae4b |
1188 | return retval; |
1189 | } |
1190 | |
7c95608a |
1191 | /* Set all lines bordering a face of type old_type to type new_type */ |
1192 | static int face_setall(solver_state *sstate, int face, |
1193 | char old_type, char new_type) |
121aae4b |
1194 | { |
7c95608a |
1195 | int retval = FALSE, r; |
121aae4b |
1196 | game_state *state = sstate->state; |
7c95608a |
1197 | grid *g; |
1198 | grid_face *f; |
1199 | int i; |
121aae4b |
1200 | |
7c95608a |
1201 | if (old_type == new_type) |
1202 | return FALSE; |
1203 | |
1204 | g = state->game_grid; |
1205 | f = g->faces + face; |
121aae4b |
1206 | |
7c95608a |
1207 | for (i = 0; i < f->order; i++) { |
1208 | int line_index = f->edges[i] - g->edges; |
1209 | if (state->lines[line_index] == old_type) { |
1210 | r = solver_set_line(sstate, line_index, new_type); |
1211 | assert(r == TRUE); |
1212 | retval = TRUE; |
1213 | } |
1214 | } |
1215 | return retval; |
121aae4b |
1216 | } |
1217 | |
1218 | /* ---------------------------------------------------------------------- |
1219 | * Loop generation and clue removal |
1220 | */ |
1221 | |
7c95608a |
1222 | /* We're going to store a list of current candidate faces for lighting. |
1223 | * Each face gets a 'score', which tells us how adding that face right |
121aae4b |
1224 | * now would affect the length of the solution loop. We're trying to |
7c95608a |
1225 | * maximise that quantity so will bias our random selection of faces to |
121aae4b |
1226 | * light towards those with high scores */ |
7c95608a |
1227 | struct face { |
121aae4b |
1228 | int score; |
1229 | unsigned long random; |
7c95608a |
1230 | grid_face *f; |
121aae4b |
1231 | }; |
1232 | |
7c95608a |
1233 | static int get_face_cmpfn(void *v1, void *v2) |
121aae4b |
1234 | { |
7c95608a |
1235 | struct face *f1 = v1; |
1236 | struct face *f2 = v2; |
1237 | /* These grid_face pointers always point into the same list of |
1238 | * 'grid_face's, so it's valid to subtract them. */ |
1239 | return f1->f - f2->f; |
121aae4b |
1240 | } |
1241 | |
7c95608a |
1242 | static int face_sort_cmpfn(void *v1, void *v2) |
121aae4b |
1243 | { |
7c95608a |
1244 | struct face *f1 = v1; |
1245 | struct face *f2 = v2; |
121aae4b |
1246 | int r; |
1247 | |
7c95608a |
1248 | r = f2->score - f1->score; |
121aae4b |
1249 | if (r) { |
1250 | return r; |
1251 | } |
1252 | |
7c95608a |
1253 | if (f1->random < f2->random) |
121aae4b |
1254 | return -1; |
7c95608a |
1255 | else if (f1->random > f2->random) |
121aae4b |
1256 | return 1; |
1257 | |
1258 | /* |
7c95608a |
1259 | * It's _just_ possible that two faces might have been given |
121aae4b |
1260 | * the same random value. In that situation, fall back to |
7c95608a |
1261 | * comparing based on the positions within the grid's face-list. |
1262 | * This introduces a tiny directional bias, but not a significant one. |
121aae4b |
1263 | */ |
7c95608a |
1264 | return get_face_cmpfn(f1, f2); |
121aae4b |
1265 | } |
1266 | |
7c95608a |
1267 | enum { FACE_LIT, FACE_UNLIT }; |
1268 | |
1269 | /* face should be of type grid_face* here. */ |
1270 | #define FACE_LIT_STATE(face) \ |
1271 | ( (face) == NULL ? FACE_UNLIT : \ |
1272 | board[(face) - g->faces] ) |
1273 | |
1274 | /* 'board' is an array of these enums, indicating which faces are |
1275 | * currently lit. Returns whether it's legal to light up the |
1276 | * given face. */ |
1277 | static int can_light_face(grid *g, char* board, int face_index) |
1278 | { |
1279 | int i, j; |
1280 | grid_face *test_face = g->faces + face_index; |
1281 | grid_face *starting_face, *current_face; |
1282 | int transitions; |
1283 | int current_state, s; |
1284 | int found_lit_neighbour = FALSE; |
1285 | assert(board[face_index] == FACE_UNLIT); |
1286 | |
1287 | /* Can only consider a face for lighting if it's adjacent to an |
1288 | * already lit face. */ |
1289 | for (i = 0; i < test_face->order; i++) { |
1290 | grid_edge *e = test_face->edges[i]; |
1291 | grid_face *f = (e->face1 == test_face) ? e->face2 : e->face1; |
1292 | if (FACE_LIT_STATE(f) == FACE_LIT) { |
1293 | found_lit_neighbour = TRUE; |
1294 | break; |
1295 | } |
1296 | } |
1297 | if (!found_lit_neighbour) |
1298 | return FALSE; |
1299 | |
1300 | /* Need to avoid creating a loop of lit faces around some unlit faces. |
1301 | * Also need to avoid meeting another lit face at a corner, with |
1302 | * unlit faces in between. Here's a simple test that (I believe) takes |
1303 | * care of both these conditions: |
1304 | * |
1305 | * Take the circular path formed by this face's edges, and inflate it |
1306 | * slightly outwards. Imagine walking around this path and consider |
1307 | * the faces that you visit in sequence. This will include all faces |
1308 | * touching the given face, either along an edge or just at a corner. |
1309 | * Count the number of LIT/UNLIT transitions you encounter, as you walk |
1310 | * along the complete loop. This will obviously turn out to be an even |
1311 | * number. |
1312 | * If 0, we're either in a completely unlit zone, or this face is a hole |
1313 | * in a completely lit zone. If the former, we would create a brand new |
1314 | * island by lighting this face. And the latter ought to be impossible - |
1315 | * it would mean there's already a lit loop, so something went wrong |
1316 | * earlier. |
1317 | * If 4 or greater, there are too many separate lit regions touching this |
1318 | * face, and lighting it up would create a loop or a corner-violation. |
1319 | * The only allowed case is when the count is exactly 2. */ |
1320 | |
1321 | /* i points to a dot around the test face. |
1322 | * j points to a face around the i^th dot. |
1323 | * The current face will always be: |
1324 | * test_face->dots[i]->faces[j] |
1325 | * We assume dots go clockwise around the test face, |
1326 | * and faces go clockwise around dots. */ |
1327 | i = j = 0; |
1328 | starting_face = test_face->dots[0]->faces[0]; |
1329 | if (starting_face == test_face) { |
1330 | j = 1; |
1331 | starting_face = test_face->dots[0]->faces[1]; |
1332 | } |
1333 | current_face = starting_face; |
1334 | transitions = 0; |
1335 | current_state = FACE_LIT_STATE(current_face); |
1336 | |
1337 | do { |
1338 | /* Advance to next face. |
1339 | * Need to loop here because it might take several goes to |
1340 | * find it. */ |
1341 | while (TRUE) { |
1342 | j++; |
1343 | if (j == test_face->dots[i]->order) |
1344 | j = 0; |
1345 | |
1346 | if (test_face->dots[i]->faces[j] == test_face) { |
1347 | /* Advance to next dot round test_face, then |
1348 | * find current_face around new dot |
1349 | * and advance to the next face clockwise */ |
1350 | i++; |
1351 | if (i == test_face->order) |
1352 | i = 0; |
1353 | for (j = 0; j < test_face->dots[i]->order; j++) { |
1354 | if (test_face->dots[i]->faces[j] == current_face) |
1355 | break; |
1356 | } |
1357 | /* Must actually find current_face around new dot, |
1358 | * or else something's wrong with the grid. */ |
1359 | assert(j != test_face->dots[i]->order); |
1360 | /* Found, so advance to next face and try again */ |
1361 | } else { |
1362 | break; |
1363 | } |
1364 | } |
1365 | /* (i,j) are now advanced to next face */ |
1366 | current_face = test_face->dots[i]->faces[j]; |
1367 | s = FACE_LIT_STATE(current_face); |
1368 | if (s != current_state) { |
1369 | ++transitions; |
1370 | current_state = s; |
1371 | if (transitions > 2) |
1372 | return FALSE; /* no point in continuing */ |
1373 | } |
1374 | } while (current_face != starting_face); |
121aae4b |
1375 | |
7c95608a |
1376 | return (transitions == 2) ? TRUE : FALSE; |
1377 | } |
121aae4b |
1378 | |
7c95608a |
1379 | /* The 'score' of a face reflects its current desirability for selection |
1380 | * as the next face to light. We want to encourage moving into uncharted |
1381 | * areas so we give scores according to how many of the face's neighbours |
1382 | * are currently unlit. */ |
1383 | static int face_score(grid *g, char *board, grid_face *face) |
1384 | { |
1385 | /* Simple formula: score = neighbours unlit - neighbours lit */ |
1386 | int lit_count = 0, unlit_count = 0; |
1387 | int i; |
1388 | grid_face *f; |
1389 | grid_edge *e; |
1390 | for (i = 0; i < face->order; i++) { |
1391 | e = face->edges[i]; |
1392 | f = (e->face1 == face) ? e->face2 : e->face1; |
1393 | if (FACE_LIT_STATE(f) == FACE_LIT) |
1394 | ++lit_count; |
1395 | else |
1396 | ++unlit_count; |
1397 | } |
1398 | return unlit_count - lit_count; |
1399 | } |
121aae4b |
1400 | |
7c95608a |
1401 | /* Generate a new complete set of clues for the given game_state. */ |
121aae4b |
1402 | static void add_full_clues(game_state *state, random_state *rs) |
1403 | { |
7c95608a |
1404 | signed char *clues = state->clues; |
121aae4b |
1405 | char *board; |
7c95608a |
1406 | grid *g = state->game_grid; |
1407 | int i, j, c; |
1408 | int num_faces = g->num_faces; |
1409 | int first_time = TRUE; |
121aae4b |
1410 | |
7c95608a |
1411 | struct face *face, *tmpface; |
1412 | struct face face_pos; |
121aae4b |
1413 | |
1414 | /* These will contain exactly the same information, sorted into different |
1415 | * orders */ |
7c95608a |
1416 | tree234 *lightable_faces_sorted, *lightable_faces_gettable; |
1417 | |
1418 | #define IS_LIGHTING_CANDIDATE(i) \ |
1419 | (board[i] == FACE_UNLIT && \ |
1420 | can_light_face(g, board, i)) |
1421 | |
1422 | board = snewn(num_faces, char); |
121aae4b |
1423 | |
1424 | /* Make a board */ |
7c95608a |
1425 | memset(board, FACE_UNLIT, num_faces); |
1426 | |
1427 | /* We need a way of favouring faces that will increase our loopiness. |
1428 | * We do this by maintaining a list of all candidate faces sorted by |
1429 | * their score and choose randomly from that with appropriate skew. |
1430 | * In order to avoid consistently biasing towards particular faces, we |
121aae4b |
1431 | * need the sort order _within_ each group of scores to be completely |
1432 | * random. But it would be abusing the hospitality of the tree234 data |
1433 | * structure if our comparison function were nondeterministic :-). So with |
7c95608a |
1434 | * each face we associate a random number that does not change during a |
121aae4b |
1435 | * particular run of the generator, and use that as a secondary sort key. |
7c95608a |
1436 | * Yes, this means we will be biased towards particular random faces in |
121aae4b |
1437 | * any one run but that doesn't actually matter. */ |
7c95608a |
1438 | |
1439 | lightable_faces_sorted = newtree234(face_sort_cmpfn); |
1440 | lightable_faces_gettable = newtree234(get_face_cmpfn); |
1441 | #define ADD_FACE(f) \ |
121aae4b |
1442 | do { \ |
7c95608a |
1443 | struct face *x = add234(lightable_faces_sorted, f); \ |
1444 | assert(x == f); \ |
1445 | x = add234(lightable_faces_gettable, f); \ |
1446 | assert(x == f); \ |
121aae4b |
1447 | } while (0) |
1448 | |
7c95608a |
1449 | #define REMOVE_FACE(f) \ |
121aae4b |
1450 | do { \ |
7c95608a |
1451 | struct face *x = del234(lightable_faces_sorted, f); \ |
1452 | assert(x); \ |
1453 | x = del234(lightable_faces_gettable, f); \ |
1454 | assert(x); \ |
121aae4b |
1455 | } while (0) |
7c95608a |
1456 | |
1457 | /* Light faces one at a time until the board is interesting enough */ |
121aae4b |
1458 | while (TRUE) |
1459 | { |
7c95608a |
1460 | if (first_time) { |
1461 | first_time = FALSE; |
1462 | /* lightable_faces_xxx are empty, so start the process by |
1463 | * lighting up the middle face. These tree234s should |
1464 | * remain empty, consistent with what would happen if |
1465 | * first_time were FALSE. */ |
1466 | board[g->middle_face - g->faces] = FACE_LIT; |
1467 | face = snew(struct face); |
1468 | face->f = g->middle_face; |
1469 | /* No need to initialise any more of 'face' here, no other fields |
1470 | * are used in this case. */ |
1471 | } else { |
1472 | /* We have count234(lightable_faces_gettable) possibilities, and in |
1473 | * lightable_faces_sorted they are sorted with the most desirable |
1474 | * first. */ |
1475 | c = count234(lightable_faces_sorted); |
1476 | if (c == 0) |
1477 | break; |
1478 | assert(c == count234(lightable_faces_gettable)); |
121aae4b |
1479 | |
7c95608a |
1480 | /* Check that the best face available is any good */ |
1481 | face = (struct face *)index234(lightable_faces_sorted, 0); |
1482 | assert(face); |
121aae4b |
1483 | |
7c95608a |
1484 | /* |
1485 | * The situation for a general grid is slightly different from |
1486 | * a square grid. Decreasing the perimeter should be allowed |
1487 | * sometimes (think about creating a hexagon of lit triangles, |
1488 | * for example). For if it were _never_ done, then the user would |
1489 | * be able to illicitly deduce certain things. So we do it |
1490 | * sometimes but not always. |
1491 | */ |
1492 | if (face->score <= 0 && random_upto(rs, 2) == 0) { |
1493 | break; |
1494 | } |
121aae4b |
1495 | |
7c95608a |
1496 | assert(face->f); /* not the infinite face */ |
1497 | assert(FACE_LIT_STATE(face->f) == FACE_UNLIT); |
121aae4b |
1498 | |
7c95608a |
1499 | /* Update data structures */ |
1500 | /* Light up the face and remove it from the lists */ |
1501 | board[face->f - g->faces] = FACE_LIT; |
1502 | REMOVE_FACE(face); |
1503 | } |
121aae4b |
1504 | |
7c95608a |
1505 | /* The face we've just lit up potentially affects the lightability |
1506 | * of any neighbouring faces (touching at a corner or edge). So the |
1507 | * search needs to be conducted around all faces touching the one |
1508 | * we've just lit. Iterate over its corners, then over each corner's |
1509 | * faces. */ |
1510 | for (i = 0; i < face->f->order; i++) { |
1511 | grid_dot *d = face->f->dots[i]; |
1512 | for (j = 0; j < d->order; j++) { |
1513 | grid_face *f2 = d->faces[j]; |
1514 | if (f2 == NULL) |
121aae4b |
1515 | continue; |
7c95608a |
1516 | if (f2 == face->f) |
1517 | continue; |
1518 | face_pos.f = f2; |
1519 | tmpface = find234(lightable_faces_gettable, &face_pos, NULL); |
1520 | if (tmpface) { |
1521 | assert(tmpface->f == face_pos.f); |
1522 | assert(FACE_LIT_STATE(tmpface->f) == FACE_UNLIT); |
1523 | REMOVE_FACE(tmpface); |
121aae4b |
1524 | } else { |
7c95608a |
1525 | tmpface = snew(struct face); |
1526 | tmpface->f = face_pos.f; |
1527 | tmpface->random = random_bits(rs, 31); |
121aae4b |
1528 | } |
7c95608a |
1529 | tmpface->score = face_score(g, board, tmpface->f); |
121aae4b |
1530 | |
7c95608a |
1531 | if (IS_LIGHTING_CANDIDATE(tmpface->f - g->faces)) { |
1532 | ADD_FACE(tmpface); |
121aae4b |
1533 | } else { |
7c95608a |
1534 | sfree(tmpface); |
121aae4b |
1535 | } |
1536 | } |
1537 | } |
7c95608a |
1538 | sfree(face); |
121aae4b |
1539 | } |
1540 | |
1541 | /* Clean up */ |
7c95608a |
1542 | while ((face = delpos234(lightable_faces_gettable, 0)) != NULL) |
1543 | sfree(face); |
1544 | freetree234(lightable_faces_gettable); |
1545 | freetree234(lightable_faces_sorted); |
1546 | |
1547 | /* Fill out all the clues by initialising to 0, then iterating over |
1548 | * all edges and incrementing each clue as we find edges that border |
1549 | * between LIT/UNLIT faces */ |
1550 | memset(clues, 0, num_faces); |
1551 | for (i = 0; i < g->num_edges; i++) { |
1552 | grid_edge *e = g->edges + i; |
1553 | grid_face *f1 = e->face1; |
1554 | grid_face *f2 = e->face2; |
1555 | if (FACE_LIT_STATE(f1) != FACE_LIT_STATE(f2)) { |
1556 | if (f1) clues[f1 - g->faces]++; |
1557 | if (f2) clues[f2 - g->faces]++; |
1558 | } |
121aae4b |
1559 | } |
1560 | |
1561 | sfree(board); |
1562 | } |
1563 | |
7c95608a |
1564 | |
1a739e2f |
1565 | static int game_has_unique_soln(const game_state *state, int diff) |
121aae4b |
1566 | { |
1567 | int ret; |
1568 | solver_state *sstate_new; |
1569 | solver_state *sstate = new_solver_state((game_state *)state, diff); |
7c95608a |
1570 | |
121aae4b |
1571 | sstate_new = solve_game_rec(sstate, diff); |
1572 | |
1573 | assert(sstate_new->solver_status != SOLVER_MISTAKE); |
1574 | ret = (sstate_new->solver_status == SOLVER_SOLVED); |
1575 | |
1576 | free_solver_state(sstate_new); |
1577 | free_solver_state(sstate); |
1578 | |
1579 | return ret; |
1580 | } |
1581 | |
7c95608a |
1582 | |
121aae4b |
1583 | /* Remove clues one at a time at random. */ |
7c95608a |
1584 | static game_state *remove_clues(game_state *state, random_state *rs, |
1a739e2f |
1585 | int diff) |
121aae4b |
1586 | { |
7c95608a |
1587 | int *face_list; |
1588 | int num_faces = state->game_grid->num_faces; |
121aae4b |
1589 | game_state *ret = dup_game(state), *saved_ret; |
1590 | int n; |
121aae4b |
1591 | |
1592 | /* We need to remove some clues. We'll do this by forming a list of all |
1593 | * available clues, shuffling it, then going along one at a |
1594 | * time clearing each clue in turn for which doing so doesn't render the |
1595 | * board unsolvable. */ |
7c95608a |
1596 | face_list = snewn(num_faces, int); |
1597 | for (n = 0; n < num_faces; ++n) { |
1598 | face_list[n] = n; |
121aae4b |
1599 | } |
1600 | |
7c95608a |
1601 | shuffle(face_list, num_faces, sizeof(int), rs); |
121aae4b |
1602 | |
7c95608a |
1603 | for (n = 0; n < num_faces; ++n) { |
1604 | saved_ret = dup_game(ret); |
1605 | ret->clues[face_list[n]] = -1; |
121aae4b |
1606 | |
1607 | if (game_has_unique_soln(ret, diff)) { |
1608 | free_game(saved_ret); |
1609 | } else { |
1610 | free_game(ret); |
1611 | ret = saved_ret; |
1612 | } |
1613 | } |
7c95608a |
1614 | sfree(face_list); |
121aae4b |
1615 | |
1616 | return ret; |
1617 | } |
1618 | |
7c95608a |
1619 | |
121aae4b |
1620 | static char *new_game_desc(game_params *params, random_state *rs, |
1621 | char **aux, int interactive) |
1622 | { |
1623 | /* solution and description both use run-length encoding in obvious ways */ |
1624 | char *retval; |
7c95608a |
1625 | grid *g; |
1626 | game_state *state = snew(game_state); |
1627 | game_state *state_new; |
1628 | params_generate_grid(params); |
1629 | state->game_grid = g = params->game_grid; |
1630 | g->refcount++; |
1631 | state->clues = snewn(g->num_faces, signed char); |
1632 | state->lines = snewn(g->num_edges, char); |
b6bf0adc |
1633 | state->line_errors = snewn(g->num_edges, unsigned char); |
121aae4b |
1634 | |
7c95608a |
1635 | state->grid_type = params->type; |
121aae4b |
1636 | |
7c95608a |
1637 | newboard_please: |
121aae4b |
1638 | |
7c95608a |
1639 | memset(state->lines, LINE_UNKNOWN, g->num_edges); |
b6bf0adc |
1640 | memset(state->line_errors, 0, g->num_edges); |
121aae4b |
1641 | |
1642 | state->solved = state->cheated = FALSE; |
121aae4b |
1643 | |
1644 | /* Get a new random solvable board with all its clues filled in. Yes, this |
1645 | * can loop for ever if the params are suitably unfavourable, but |
1646 | * preventing games smaller than 4x4 seems to stop this happening */ |
121aae4b |
1647 | do { |
1648 | add_full_clues(state, rs); |
1649 | } while (!game_has_unique_soln(state, params->diff)); |
1650 | |
1651 | state_new = remove_clues(state, rs, params->diff); |
1652 | free_game(state); |
1653 | state = state_new; |
1654 | |
7c95608a |
1655 | |
121aae4b |
1656 | if (params->diff > 0 && game_has_unique_soln(state, params->diff-1)) { |
1a739e2f |
1657 | #ifdef SHOW_WORKING |
121aae4b |
1658 | fprintf(stderr, "Rejecting board, it is too easy\n"); |
1a739e2f |
1659 | #endif |
121aae4b |
1660 | goto newboard_please; |
1661 | } |
1662 | |
1663 | retval = state_to_text(state); |
1664 | |
1665 | free_game(state); |
7c95608a |
1666 | |
121aae4b |
1667 | assert(!validate_desc(params, retval)); |
1668 | |
1669 | return retval; |
1670 | } |
1671 | |
1672 | static game_state *new_game(midend *me, game_params *params, char *desc) |
1673 | { |
7c95608a |
1674 | int i; |
121aae4b |
1675 | game_state *state = snew(game_state); |
1676 | int empties_to_make = 0; |
1677 | int n; |
1678 | const char *dp = desc; |
7c95608a |
1679 | grid *g; |
1515b973 |
1680 | int num_faces, num_edges; |
1681 | |
7c95608a |
1682 | params_generate_grid(params); |
1683 | state->game_grid = g = params->game_grid; |
1684 | g->refcount++; |
1515b973 |
1685 | num_faces = g->num_faces; |
1686 | num_edges = g->num_edges; |
121aae4b |
1687 | |
7c95608a |
1688 | state->clues = snewn(num_faces, signed char); |
1689 | state->lines = snewn(num_edges, char); |
b6bf0adc |
1690 | state->line_errors = snewn(num_edges, unsigned char); |
121aae4b |
1691 | |
1692 | state->solved = state->cheated = FALSE; |
1693 | |
7c95608a |
1694 | state->grid_type = params->type; |
1695 | |
1696 | for (i = 0; i < num_faces; i++) { |
121aae4b |
1697 | if (empties_to_make) { |
1698 | empties_to_make--; |
7c95608a |
1699 | state->clues[i] = -1; |
121aae4b |
1700 | continue; |
1701 | } |
1702 | |
1703 | assert(*dp); |
1704 | n = *dp - '0'; |
1705 | if (n >= 0 && n < 10) { |
7c95608a |
1706 | state->clues[i] = n; |
121aae4b |
1707 | } else { |
1708 | n = *dp - 'a' + 1; |
1709 | assert(n > 0); |
7c95608a |
1710 | state->clues[i] = -1; |
121aae4b |
1711 | empties_to_make = n - 1; |
1712 | } |
1713 | ++dp; |
1714 | } |
1715 | |
7c95608a |
1716 | memset(state->lines, LINE_UNKNOWN, num_edges); |
b6bf0adc |
1717 | memset(state->line_errors, 0, num_edges); |
121aae4b |
1718 | return state; |
1719 | } |
1720 | |
b6bf0adc |
1721 | /* Calculates the line_errors data, and checks if the current state is a |
1722 | * solution */ |
1723 | static int check_completion(game_state *state) |
1724 | { |
1725 | grid *g = state->game_grid; |
1726 | int *dsf; |
1727 | int num_faces = g->num_faces; |
1728 | int i; |
1729 | int infinite_area, finite_area; |
1730 | int loops_found = 0; |
1731 | int found_edge_not_in_loop = FALSE; |
1732 | |
1733 | memset(state->line_errors, 0, g->num_edges); |
1734 | |
1735 | /* LL implementation of SGT's idea: |
1736 | * A loop will partition the grid into an inside and an outside. |
1737 | * If there is more than one loop, the grid will be partitioned into |
1738 | * even more distinct regions. We can therefore track equivalence of |
1739 | * faces, by saying that two faces are equivalent when there is a non-YES |
1740 | * edge between them. |
1741 | * We could keep track of the number of connected components, by counting |
1742 | * the number of dsf-merges that aren't no-ops. |
1743 | * But we're only interested in 3 separate cases: |
1744 | * no loops, one loop, more than one loop. |
1745 | * |
1746 | * No loops: all faces are equivalent to the infinite face. |
1747 | * One loop: only two equivalence classes - finite and infinite. |
1748 | * >= 2 loops: there are 2 distinct finite regions. |
1749 | * |
1750 | * So we simply make two passes through all the edges. |
1751 | * In the first pass, we dsf-merge the two faces bordering each non-YES |
1752 | * edge. |
1753 | * In the second pass, we look for YES-edges bordering: |
1754 | * a) two non-equivalent faces. |
1755 | * b) two non-equivalent faces, and one of them is part of a different |
1756 | * finite area from the first finite area we've seen. |
1757 | * |
1758 | * An occurrence of a) means there is at least one loop. |
1759 | * An occurrence of b) means there is more than one loop. |
1760 | * Edges satisfying a) are marked as errors. |
1761 | * |
1762 | * While we're at it, we set a flag if we find a YES edge that is not |
1763 | * part of a loop. |
1764 | * This information will help decide, if there's a single loop, whether it |
1765 | * is a candidate for being a solution (that is, all YES edges are part of |
1766 | * this loop). |
1767 | * |
1768 | * If there is a candidate loop, we then go through all clues and check |
1769 | * they are all satisfied. If so, we have found a solution and we can |
1770 | * unmark all line_errors. |
1771 | */ |
1772 | |
1773 | /* Infinite face is at the end - its index is num_faces. |
1774 | * This macro is just to make this obvious! */ |
1775 | #define INF_FACE num_faces |
1776 | dsf = snewn(num_faces + 1, int); |
1777 | dsf_init(dsf, num_faces + 1); |
1778 | |
1779 | /* First pass */ |
1780 | for (i = 0; i < g->num_edges; i++) { |
1781 | grid_edge *e = g->edges + i; |
1782 | int f1 = e->face1 ? e->face1 - g->faces : INF_FACE; |
1783 | int f2 = e->face2 ? e->face2 - g->faces : INF_FACE; |
1784 | if (state->lines[i] != LINE_YES) |
1785 | dsf_merge(dsf, f1, f2); |
1786 | } |
1787 | |
1788 | /* Second pass */ |
1789 | infinite_area = dsf_canonify(dsf, INF_FACE); |
1790 | finite_area = -1; |
1791 | for (i = 0; i < g->num_edges; i++) { |
1792 | grid_edge *e = g->edges + i; |
1793 | int f1 = e->face1 ? e->face1 - g->faces : INF_FACE; |
1794 | int can1 = dsf_canonify(dsf, f1); |
1795 | int f2 = e->face2 ? e->face2 - g->faces : INF_FACE; |
1796 | int can2 = dsf_canonify(dsf, f2); |
1797 | if (state->lines[i] != LINE_YES) continue; |
1798 | |
1799 | if (can1 == can2) { |
1800 | /* Faces are equivalent, so this edge not part of a loop */ |
1801 | found_edge_not_in_loop = TRUE; |
1802 | continue; |
1803 | } |
1804 | state->line_errors[i] = TRUE; |
1805 | if (loops_found == 0) loops_found = 1; |
1806 | |
1807 | /* Don't bother with further checks if we've already found 2 loops */ |
1808 | if (loops_found == 2) continue; |
1809 | |
1810 | if (finite_area == -1) { |
1811 | /* Found our first finite area */ |
1812 | if (can1 != infinite_area) |
1813 | finite_area = can1; |
1814 | else |
1815 | finite_area = can2; |
1816 | } |
1817 | |
1818 | /* Have we found a second area? */ |
1819 | if (finite_area != -1) { |
1820 | if (can1 != infinite_area && can1 != finite_area) { |
1821 | loops_found = 2; |
1822 | continue; |
1823 | } |
1824 | if (can2 != infinite_area && can2 != finite_area) { |
1825 | loops_found = 2; |
1826 | } |
1827 | } |
1828 | } |
1829 | |
1830 | /* |
1831 | printf("loops_found = %d\n", loops_found); |
1832 | printf("found_edge_not_in_loop = %s\n", |
1833 | found_edge_not_in_loop ? "TRUE" : "FALSE"); |
1834 | */ |
1835 | |
1836 | sfree(dsf); /* No longer need the dsf */ |
1837 | |
1838 | /* Have we found a candidate loop? */ |
1839 | if (loops_found == 1 && !found_edge_not_in_loop) { |
1840 | /* Yes, so check all clues are satisfied */ |
1841 | int found_clue_violation = FALSE; |
1842 | for (i = 0; i < num_faces; i++) { |
1843 | int c = state->clues[i]; |
1844 | if (c >= 0) { |
1845 | if (face_order(state, i, LINE_YES) != c) { |
1846 | found_clue_violation = TRUE; |
1847 | break; |
1848 | } |
1849 | } |
1850 | } |
1851 | |
1852 | if (!found_clue_violation) { |
1853 | /* The loop is good */ |
1854 | memset(state->line_errors, 0, g->num_edges); |
1855 | return TRUE; /* No need to bother checking for dot violations */ |
1856 | } |
1857 | } |
1858 | |
1859 | /* Check for dot violations */ |
1860 | for (i = 0; i < g->num_dots; i++) { |
1861 | int yes = dot_order(state, i, LINE_YES); |
1862 | int unknown = dot_order(state, i, LINE_UNKNOWN); |
1863 | if ((yes == 1 && unknown == 0) || (yes >= 3)) { |
1864 | /* violation, so mark all YES edges as errors */ |
1865 | grid_dot *d = g->dots + i; |
1866 | int j; |
1867 | for (j = 0; j < d->order; j++) { |
1868 | int e = d->edges[j] - g->edges; |
1869 | if (state->lines[e] == LINE_YES) |
1870 | state->line_errors[e] = TRUE; |
1871 | } |
1872 | } |
1873 | } |
1874 | return FALSE; |
1875 | } |
121aae4b |
1876 | |
1877 | /* ---------------------------------------------------------------------- |
1878 | * Solver logic |
1879 | * |
1880 | * Our solver modes operate as follows. Each mode also uses the modes above it. |
1881 | * |
1882 | * Easy Mode |
1883 | * Just implement the rules of the game. |
1884 | * |
1885 | * Normal Mode |
7c95608a |
1886 | * For each (adjacent) pair of lines through each dot we store a bit for |
1887 | * whether at least one of them is on and whether at most one is on. (If we |
1888 | * know both or neither is on that's already stored more directly.) |
121aae4b |
1889 | * |
1890 | * Advanced Mode |
1891 | * Use edsf data structure to make equivalence classes of lines that are |
1892 | * known identical to or opposite to one another. |
1893 | */ |
1894 | |
121aae4b |
1895 | |
7c95608a |
1896 | /* DLines: |
1897 | * For general grids, we consider "dlines" to be pairs of lines joined |
1898 | * at a dot. The lines must be adjacent around the dot, so we can think of |
1899 | * a dline as being a dot+face combination. Or, a dot+edge combination where |
1900 | * the second edge is taken to be the next clockwise edge from the dot. |
1901 | * Original loopy code didn't have this extra restriction of the lines being |
1902 | * adjacent. From my tests with square grids, this extra restriction seems to |
1903 | * take little, if anything, away from the quality of the puzzles. |
1904 | * A dline can be uniquely identified by an edge/dot combination, given that |
1905 | * a dline-pair always goes clockwise around its common dot. The edge/dot |
1906 | * combination can be represented by an edge/bool combination - if bool is |
1907 | * TRUE, use edge->dot1 else use edge->dot2. So the total number of dlines is |
1908 | * exactly twice the number of edges in the grid - although the dlines |
1909 | * spanning the infinite face are not all that useful to the solver. |
1910 | * Note that, by convention, a dline goes clockwise around its common dot, |
1911 | * which means the dline goes anti-clockwise around its common face. |
1912 | */ |
121aae4b |
1913 | |
7c95608a |
1914 | /* Helper functions for obtaining an index into an array of dlines, given |
1915 | * various information. We assume the grid layout conventions about how |
1916 | * the various lists are interleaved - see grid_make_consistent() for |
1917 | * details. */ |
121aae4b |
1918 | |
7c95608a |
1919 | /* i points to the first edge of the dline pair, reading clockwise around |
1920 | * the dot. */ |
1921 | static int dline_index_from_dot(grid *g, grid_dot *d, int i) |
121aae4b |
1922 | { |
7c95608a |
1923 | grid_edge *e = d->edges[i]; |
121aae4b |
1924 | int ret; |
7c95608a |
1925 | #ifdef DEBUG_DLINES |
1926 | grid_edge *e2; |
1927 | int i2 = i+1; |
1928 | if (i2 == d->order) i2 = 0; |
1929 | e2 = d->edges[i2]; |
1930 | #endif |
1931 | ret = 2 * (e - g->edges) + ((e->dot1 == d) ? 1 : 0); |
1932 | #ifdef DEBUG_DLINES |
1933 | printf("dline_index_from_dot: d=%d,i=%d, edges [%d,%d] - %d\n", |
1934 | (int)(d - g->dots), i, (int)(e - g->edges), |
1935 | (int)(e2 - g->edges), ret); |
121aae4b |
1936 | #endif |
1937 | return ret; |
1938 | } |
7c95608a |
1939 | /* i points to the second edge of the dline pair, reading clockwise around |
1940 | * the face. That is, the edges of the dline, starting at edge{i}, read |
1941 | * anti-clockwise around the face. By layout conventions, the common dot |
1942 | * of the dline will be f->dots[i] */ |
1943 | static int dline_index_from_face(grid *g, grid_face *f, int i) |
121aae4b |
1944 | { |
7c95608a |
1945 | grid_edge *e = f->edges[i]; |
1946 | grid_dot *d = f->dots[i]; |
121aae4b |
1947 | int ret; |
7c95608a |
1948 | #ifdef DEBUG_DLINES |
1949 | grid_edge *e2; |
1950 | int i2 = i - 1; |
1951 | if (i2 < 0) i2 += f->order; |
1952 | e2 = f->edges[i2]; |
1953 | #endif |
1954 | ret = 2 * (e - g->edges) + ((e->dot1 == d) ? 1 : 0); |
1955 | #ifdef DEBUG_DLINES |
1956 | printf("dline_index_from_face: f=%d,i=%d, edges [%d,%d] - %d\n", |
1957 | (int)(f - g->faces), i, (int)(e - g->edges), |
1958 | (int)(e2 - g->edges), ret); |
121aae4b |
1959 | #endif |
1960 | return ret; |
1961 | } |
7c95608a |
1962 | static int is_atleastone(const char *dline_array, int index) |
121aae4b |
1963 | { |
7c95608a |
1964 | return BIT_SET(dline_array[index], 0); |
121aae4b |
1965 | } |
7c95608a |
1966 | static int set_atleastone(char *dline_array, int index) |
121aae4b |
1967 | { |
7c95608a |
1968 | return SET_BIT(dline_array[index], 0); |
121aae4b |
1969 | } |
7c95608a |
1970 | static int is_atmostone(const char *dline_array, int index) |
121aae4b |
1971 | { |
7c95608a |
1972 | return BIT_SET(dline_array[index], 1); |
1973 | } |
1974 | static int set_atmostone(char *dline_array, int index) |
1975 | { |
1976 | return SET_BIT(dline_array[index], 1); |
121aae4b |
1977 | } |
121aae4b |
1978 | |
1979 | static void array_setall(char *array, char from, char to, int len) |
1980 | { |
1981 | char *p = array, *p_old = p; |
1982 | int len_remaining = len; |
1983 | |
1984 | while ((p = memchr(p, from, len_remaining))) { |
1985 | *p = to; |
1986 | len_remaining -= p - p_old; |
1987 | p_old = p; |
1988 | } |
1989 | } |
6193da8d |
1990 | |
7c95608a |
1991 | /* Helper, called when doing dline dot deductions, in the case where we |
1992 | * have 4 UNKNOWNs, and two of them (adjacent) have *exactly* one YES between |
1993 | * them (because of dline atmostone/atleastone). |
1994 | * On entry, edge points to the first of these two UNKNOWNs. This function |
1995 | * will find the opposite UNKNOWNS (if they are adjacent to one another) |
1996 | * and set their corresponding dline to atleastone. (Setting atmostone |
1997 | * already happens in earlier dline deductions) */ |
1998 | static int dline_set_opp_atleastone(solver_state *sstate, |
1999 | grid_dot *d, int edge) |
121aae4b |
2000 | { |
7c95608a |
2001 | game_state *state = sstate->state; |
2002 | grid *g = state->game_grid; |
2003 | int N = d->order; |
2004 | int opp, opp2; |
2005 | for (opp = 0; opp < N; opp++) { |
2006 | int opp_dline_index; |
2007 | if (opp == edge || opp == edge+1 || opp == edge-1) |
2008 | continue; |
2009 | if (opp == 0 && edge == N-1) |
2010 | continue; |
2011 | if (opp == N-1 && edge == 0) |
2012 | continue; |
2013 | opp2 = opp + 1; |
2014 | if (opp2 == N) opp2 = 0; |
2015 | /* Check if opp, opp2 point to LINE_UNKNOWNs */ |
2016 | if (state->lines[d->edges[opp] - g->edges] != LINE_UNKNOWN) |
2017 | continue; |
2018 | if (state->lines[d->edges[opp2] - g->edges] != LINE_UNKNOWN) |
2019 | continue; |
2020 | /* Found opposite UNKNOWNS and they're next to each other */ |
2021 | opp_dline_index = dline_index_from_dot(g, d, opp); |
2022 | return set_atleastone(sstate->normal->dlines, opp_dline_index); |
121aae4b |
2023 | } |
7c95608a |
2024 | return FALSE; |
121aae4b |
2025 | } |
6193da8d |
2026 | |
121aae4b |
2027 | |
7c95608a |
2028 | /* Set pairs of lines around this face which are known to be identical, to |
121aae4b |
2029 | * the given line_state */ |
7c95608a |
2030 | static int face_setall_identical(solver_state *sstate, int face_index, |
2031 | enum line_state line_new) |
121aae4b |
2032 | { |
2033 | /* can[dir] contains the canonical line associated with the line in |
2034 | * direction dir from the square in question. Similarly inv[dir] is |
2035 | * whether or not the line in question is inverse to its canonical |
2036 | * element. */ |
121aae4b |
2037 | int retval = FALSE; |
7c95608a |
2038 | game_state *state = sstate->state; |
2039 | grid *g = state->game_grid; |
2040 | grid_face *f = g->faces + face_index; |
2041 | int N = f->order; |
2042 | int i, j; |
2043 | int can1, can2, inv1, inv2; |
6193da8d |
2044 | |
7c95608a |
2045 | for (i = 0; i < N; i++) { |
2046 | int line1_index = f->edges[i] - g->edges; |
2047 | if (state->lines[line1_index] != LINE_UNKNOWN) |
2048 | continue; |
2049 | for (j = i + 1; j < N; j++) { |
2050 | int line2_index = f->edges[j] - g->edges; |
2051 | if (state->lines[line2_index] != LINE_UNKNOWN) |
121aae4b |
2052 | continue; |
6193da8d |
2053 | |
7c95608a |
2054 | /* Found two UNKNOWNS */ |
2055 | can1 = edsf_canonify(sstate->hard->linedsf, line1_index, &inv1); |
2056 | can2 = edsf_canonify(sstate->hard->linedsf, line2_index, &inv2); |
2057 | if (can1 == can2 && inv1 == inv2) { |
2058 | solver_set_line(sstate, line1_index, line_new); |
2059 | solver_set_line(sstate, line2_index, line_new); |
6193da8d |
2060 | } |
2061 | } |
6193da8d |
2062 | } |
121aae4b |
2063 | return retval; |
2064 | } |
2065 | |
7c95608a |
2066 | /* Given a dot or face, and a count of LINE_UNKNOWNs, find them and |
2067 | * return the edge indices into e. */ |
2068 | static void find_unknowns(game_state *state, |
2069 | grid_edge **edge_list, /* Edge list to search (from a face or a dot) */ |
2070 | int expected_count, /* Number of UNKNOWNs (comes from solver's cache) */ |
2071 | int *e /* Returned edge indices */) |
2072 | { |
2073 | int c = 0; |
2074 | grid *g = state->game_grid; |
2075 | while (c < expected_count) { |
2076 | int line_index = *edge_list - g->edges; |
2077 | if (state->lines[line_index] == LINE_UNKNOWN) { |
2078 | e[c] = line_index; |
2079 | c++; |
6193da8d |
2080 | } |
7c95608a |
2081 | ++edge_list; |
6193da8d |
2082 | } |
6193da8d |
2083 | } |
2084 | |
7c95608a |
2085 | /* If we have a list of edges, and we know whether the number of YESs should |
2086 | * be odd or even, and there are only a few UNKNOWNs, we can do some simple |
2087 | * linedsf deductions. This can be used for both face and dot deductions. |
2088 | * Returns the difficulty level of the next solver that should be used, |
2089 | * or DIFF_MAX if no progress was made. */ |
2090 | static int parity_deductions(solver_state *sstate, |
2091 | grid_edge **edge_list, /* Edge list (from a face or a dot) */ |
2092 | int total_parity, /* Expected number of YESs modulo 2 (either 0 or 1) */ |
2093 | int unknown_count) |
6193da8d |
2094 | { |
121aae4b |
2095 | game_state *state = sstate->state; |
7c95608a |
2096 | int diff = DIFF_MAX; |
2097 | int *linedsf = sstate->hard->linedsf; |
2098 | |
2099 | if (unknown_count == 2) { |
2100 | /* Lines are known alike/opposite, depending on inv. */ |
2101 | int e[2]; |
2102 | find_unknowns(state, edge_list, 2, e); |
2103 | if (merge_lines(sstate, e[0], e[1], total_parity)) |
2104 | diff = min(diff, DIFF_HARD); |
2105 | } else if (unknown_count == 3) { |
2106 | int e[3]; |
2107 | int can[3]; /* canonical edges */ |
2108 | int inv[3]; /* whether can[x] is inverse to e[x] */ |
2109 | find_unknowns(state, edge_list, 3, e); |
2110 | can[0] = edsf_canonify(linedsf, e[0], inv); |
2111 | can[1] = edsf_canonify(linedsf, e[1], inv+1); |
2112 | can[2] = edsf_canonify(linedsf, e[2], inv+2); |
2113 | if (can[0] == can[1]) { |
2114 | if (solver_set_line(sstate, e[2], (total_parity^inv[0]^inv[1]) ? |
2115 | LINE_YES : LINE_NO)) |
2116 | diff = min(diff, DIFF_EASY); |
2117 | } |
2118 | if (can[0] == can[2]) { |
2119 | if (solver_set_line(sstate, e[1], (total_parity^inv[0]^inv[2]) ? |
2120 | LINE_YES : LINE_NO)) |
2121 | diff = min(diff, DIFF_EASY); |
2122 | } |
2123 | if (can[1] == can[2]) { |
2124 | if (solver_set_line(sstate, e[0], (total_parity^inv[1]^inv[2]) ? |
2125 | LINE_YES : LINE_NO)) |
2126 | diff = min(diff, DIFF_EASY); |
2127 | } |
2128 | } else if (unknown_count == 4) { |
2129 | int e[4]; |
2130 | int can[4]; /* canonical edges */ |
2131 | int inv[4]; /* whether can[x] is inverse to e[x] */ |
2132 | find_unknowns(state, edge_list, 4, e); |
2133 | can[0] = edsf_canonify(linedsf, e[0], inv); |
2134 | can[1] = edsf_canonify(linedsf, e[1], inv+1); |
2135 | can[2] = edsf_canonify(linedsf, e[2], inv+2); |
2136 | can[3] = edsf_canonify(linedsf, e[3], inv+3); |
2137 | if (can[0] == can[1]) { |
2138 | if (merge_lines(sstate, e[2], e[3], total_parity^inv[0]^inv[1])) |
2139 | diff = min(diff, DIFF_HARD); |
2140 | } else if (can[0] == can[2]) { |
2141 | if (merge_lines(sstate, e[1], e[3], total_parity^inv[0]^inv[2])) |
2142 | diff = min(diff, DIFF_HARD); |
2143 | } else if (can[0] == can[3]) { |
2144 | if (merge_lines(sstate, e[1], e[2], total_parity^inv[0]^inv[3])) |
2145 | diff = min(diff, DIFF_HARD); |
2146 | } else if (can[1] == can[2]) { |
2147 | if (merge_lines(sstate, e[0], e[3], total_parity^inv[1]^inv[2])) |
2148 | diff = min(diff, DIFF_HARD); |
2149 | } else if (can[1] == can[3]) { |
2150 | if (merge_lines(sstate, e[0], e[2], total_parity^inv[1]^inv[3])) |
2151 | diff = min(diff, DIFF_HARD); |
2152 | } else if (can[2] == can[3]) { |
2153 | if (merge_lines(sstate, e[0], e[1], total_parity^inv[2]^inv[3])) |
2154 | diff = min(diff, DIFF_HARD); |
6193da8d |
2155 | } |
2156 | } |
7c95608a |
2157 | return diff; |
6193da8d |
2158 | } |
2159 | |
7c95608a |
2160 | |
121aae4b |
2161 | /* |
7c95608a |
2162 | * These are the main solver functions. |
121aae4b |
2163 | * |
2164 | * Their return values are diff values corresponding to the lowest mode solver |
2165 | * that would notice the work that they have done. For example if the normal |
2166 | * mode solver adds actual lines or crosses, it will return DIFF_EASY as the |
2167 | * easy mode solver might be able to make progress using that. It doesn't make |
2168 | * sense for one of them to return a diff value higher than that of the |
7c95608a |
2169 | * function itself. |
121aae4b |
2170 | * |
2171 | * Each function returns the lowest value it can, as early as possible, in |
2172 | * order to try and pass as much work as possible back to the lower level |
2173 | * solvers which progress more quickly. |
2174 | */ |
6193da8d |
2175 | |
121aae4b |
2176 | /* PROPOSED NEW DESIGN: |
2177 | * We have a work queue consisting of 'events' notifying us that something has |
2178 | * happened that a particular solver mode might be interested in. For example |
2179 | * the hard mode solver might do something that helps the normal mode solver at |
2180 | * dot [x,y] in which case it will enqueue an event recording this fact. Then |
2181 | * we pull events off the work queue, and hand each in turn to the solver that |
2182 | * is interested in them. If a solver reports that it failed we pass the same |
2183 | * event on to progressively more advanced solvers and the loop detector. Once |
2184 | * we've exhausted an event, or it has helped us progress, we drop it and |
2185 | * continue to the next one. The events are sorted first in order of solver |
2186 | * complexity (easy first) then order of insertion (oldest first). |
2187 | * Once we run out of events we loop over each permitted solver in turn |
2188 | * (easiest first) until either a deduction is made (and an event therefore |
2189 | * emerges) or no further deductions can be made (in which case we've failed). |
2190 | * |
7c95608a |
2191 | * QUESTIONS: |
121aae4b |
2192 | * * How do we 'loop over' a solver when both dots and squares are concerned. |
2193 | * Answer: first all squares then all dots. |
2194 | */ |
2195 | |
2196 | static int easy_mode_deductions(solver_state *sstate) |
6193da8d |
2197 | { |
7c95608a |
2198 | int i, current_yes, current_no; |
2199 | game_state *state = sstate->state; |
2200 | grid *g = state->game_grid; |
1a739e2f |
2201 | int diff = DIFF_MAX; |
6193da8d |
2202 | |
7c95608a |
2203 | /* Per-face deductions */ |
2204 | for (i = 0; i < g->num_faces; i++) { |
2205 | grid_face *f = g->faces + i; |
2206 | |
2207 | if (sstate->face_solved[i]) |
121aae4b |
2208 | continue; |
6193da8d |
2209 | |
7c95608a |
2210 | current_yes = sstate->face_yes_count[i]; |
2211 | current_no = sstate->face_no_count[i]; |
c0eb17ce |
2212 | |
7c95608a |
2213 | if (current_yes + current_no == f->order) { |
2214 | sstate->face_solved[i] = TRUE; |
121aae4b |
2215 | continue; |
2216 | } |
6193da8d |
2217 | |
7c95608a |
2218 | if (state->clues[i] < 0) |
121aae4b |
2219 | continue; |
6193da8d |
2220 | |
7c95608a |
2221 | if (state->clues[i] < current_yes) { |
121aae4b |
2222 | sstate->solver_status = SOLVER_MISTAKE; |
2223 | return DIFF_EASY; |
2224 | } |
7c95608a |
2225 | if (state->clues[i] == current_yes) { |
2226 | if (face_setall(sstate, i, LINE_UNKNOWN, LINE_NO)) |
121aae4b |
2227 | diff = min(diff, DIFF_EASY); |
7c95608a |
2228 | sstate->face_solved[i] = TRUE; |
121aae4b |
2229 | continue; |
2230 | } |
c0eb17ce |
2231 | |
7c95608a |
2232 | if (f->order - state->clues[i] < current_no) { |
121aae4b |
2233 | sstate->solver_status = SOLVER_MISTAKE; |
2234 | return DIFF_EASY; |
2235 | } |
7c95608a |
2236 | if (f->order - state->clues[i] == current_no) { |
2237 | if (face_setall(sstate, i, LINE_UNKNOWN, LINE_YES)) |
121aae4b |
2238 | diff = min(diff, DIFF_EASY); |
7c95608a |
2239 | sstate->face_solved[i] = TRUE; |
121aae4b |
2240 | continue; |
2241 | } |
2242 | } |
6193da8d |
2243 | |
121aae4b |
2244 | check_caches(sstate); |
6193da8d |
2245 | |
121aae4b |
2246 | /* Per-dot deductions */ |
7c95608a |
2247 | for (i = 0; i < g->num_dots; i++) { |
2248 | grid_dot *d = g->dots + i; |
2249 | int yes, no, unknown; |
2250 | |
2251 | if (sstate->dot_solved[i]) |
121aae4b |
2252 | continue; |
c0eb17ce |
2253 | |
7c95608a |
2254 | yes = sstate->dot_yes_count[i]; |
2255 | no = sstate->dot_no_count[i]; |
2256 | unknown = d->order - yes - no; |
2257 | |
2258 | if (yes == 0) { |
2259 | if (unknown == 0) { |
2260 | sstate->dot_solved[i] = TRUE; |
2261 | } else if (unknown == 1) { |
2262 | dot_setall(sstate, i, LINE_UNKNOWN, LINE_NO); |
121aae4b |
2263 | diff = min(diff, DIFF_EASY); |
7c95608a |
2264 | sstate->dot_solved[i] = TRUE; |
2265 | } |
2266 | } else if (yes == 1) { |
2267 | if (unknown == 0) { |
121aae4b |
2268 | sstate->solver_status = SOLVER_MISTAKE; |
2269 | return DIFF_EASY; |
7c95608a |
2270 | } else if (unknown == 1) { |
2271 | dot_setall(sstate, i, LINE_UNKNOWN, LINE_YES); |
2272 | diff = min(diff, DIFF_EASY); |
2273 | } |
2274 | } else if (yes == 2) { |
2275 | if (unknown > 0) { |
2276 | dot_setall(sstate, i, LINE_UNKNOWN, LINE_NO); |
2277 | diff = min(diff, DIFF_EASY); |
2278 | } |
2279 | sstate->dot_solved[i] = TRUE; |
2280 | } else { |
2281 | sstate->solver_status = SOLVER_MISTAKE; |
2282 | return DIFF_EASY; |
6193da8d |
2283 | } |
2284 | } |
6193da8d |
2285 | |
121aae4b |
2286 | check_caches(sstate); |
6193da8d |
2287 | |
121aae4b |
2288 | return diff; |
6193da8d |
2289 | } |
2290 | |
121aae4b |
2291 | static int normal_mode_deductions(solver_state *sstate) |
6193da8d |
2292 | { |
121aae4b |
2293 | game_state *state = sstate->state; |
7c95608a |
2294 | grid *g = state->game_grid; |
2295 | char *dlines = sstate->normal->dlines; |
2296 | int i; |
1a739e2f |
2297 | int diff = DIFF_MAX; |
6193da8d |
2298 | |
7c95608a |
2299 | /* ------ Face deductions ------ */ |
2300 | |
2301 | /* Given a set of dline atmostone/atleastone constraints, need to figure |
2302 | * out if we can deduce any further info. For more general faces than |
2303 | * squares, this turns out to be a tricky problem. |
2304 | * The approach taken here is to define (per face) NxN matrices: |
2305 | * "maxs" and "mins". |
2306 | * The entries maxs(j,k) and mins(j,k) define the upper and lower limits |
2307 | * for the possible number of edges that are YES between positions j and k |
2308 | * going clockwise around the face. Can think of j and k as marking dots |
2309 | * around the face (recall the labelling scheme: edge0 joins dot0 to dot1, |
2310 | * edge1 joins dot1 to dot2 etc). |
2311 | * Trivially, mins(j,j) = maxs(j,j) = 0, and we don't even bother storing |
2312 | * these. mins(j,j+1) and maxs(j,j+1) are determined by whether edge{j} |
2313 | * is YES, NO or UNKNOWN. mins(j,j+2) and maxs(j,j+2) are related to |
2314 | * the dline atmostone/atleastone status for edges j and j+1. |
2315 | * |
2316 | * Then we calculate the remaining entries recursively. We definitely |
2317 | * know that |
2318 | * mins(j,k) >= { mins(j,u) + mins(u,k) } for any u between j and k. |
2319 | * This is because any valid placement of YESs between j and k must give |
2320 | * a valid placement between j and u, and also between u and k. |
2321 | * I believe it's sufficient to use just the two values of u: |
2322 | * j+1 and j+2. Seems to work well in practice - the bounds we compute |
2323 | * are rigorous, even if they might not be best-possible. |
2324 | * |
2325 | * Once we have maxs and mins calculated, we can make inferences about |
2326 | * each dline{j,j+1} by looking at the possible complementary edge-counts |
2327 | * mins(j+2,j) and maxs(j+2,j) and comparing these with the face clue. |
2328 | * As well as dlines, we can make similar inferences about single edges. |
2329 | * For example, consider a pentagon with clue 3, and we know at most one |
2330 | * of (edge0, edge1) is YES, and at most one of (edge2, edge3) is YES. |
2331 | * We could then deduce edge4 is YES, because maxs(0,4) would be 2, so |
2332 | * that final edge would have to be YES to make the count up to 3. |
2333 | */ |
121aae4b |
2334 | |
7c95608a |
2335 | /* Much quicker to allocate arrays on the stack than the heap, so |
2336 | * define the largest possible face size, and base our array allocations |
2337 | * on that. We check this with an assertion, in case someone decides to |
2338 | * make a grid which has larger faces than this. Note, this algorithm |
2339 | * could get quite expensive if there are many large faces. */ |
2340 | #define MAX_FACE_SIZE 8 |
2341 | |
2342 | for (i = 0; i < g->num_faces; i++) { |
2343 | int maxs[MAX_FACE_SIZE][MAX_FACE_SIZE]; |
2344 | int mins[MAX_FACE_SIZE][MAX_FACE_SIZE]; |
2345 | grid_face *f = g->faces + i; |
2346 | int N = f->order; |
2347 | int j,m; |
2348 | int clue = state->clues[i]; |
2349 | assert(N <= MAX_FACE_SIZE); |
2350 | if (sstate->face_solved[i]) |
6193da8d |
2351 | continue; |
7c95608a |
2352 | if (clue < 0) continue; |
2353 | |
2354 | /* Calculate the (j,j+1) entries */ |
2355 | for (j = 0; j < N; j++) { |
2356 | int edge_index = f->edges[j] - g->edges; |
2357 | int dline_index; |
2358 | enum line_state line1 = state->lines[edge_index]; |
2359 | enum line_state line2; |
2360 | int tmp; |
2361 | int k = j + 1; |
2362 | if (k >= N) k = 0; |
2363 | maxs[j][k] = (line1 == LINE_NO) ? 0 : 1; |
2364 | mins[j][k] = (line1 == LINE_YES) ? 1 : 0; |
2365 | /* Calculate the (j,j+2) entries */ |
2366 | dline_index = dline_index_from_face(g, f, k); |
2367 | edge_index = f->edges[k] - g->edges; |
2368 | line2 = state->lines[edge_index]; |
2369 | k++; |
2370 | if (k >= N) k = 0; |
2371 | |
2372 | /* max */ |
2373 | tmp = 2; |
2374 | if (line1 == LINE_NO) tmp--; |
2375 | if (line2 == LINE_NO) tmp--; |
2376 | if (tmp == 2 && is_atmostone(dlines, dline_index)) |
2377 | tmp = 1; |
2378 | maxs[j][k] = tmp; |
2379 | |
2380 | /* min */ |
2381 | tmp = 0; |
2382 | if (line1 == LINE_YES) tmp++; |
2383 | if (line2 == LINE_YES) tmp++; |
2384 | if (tmp == 0 && is_atleastone(dlines, dline_index)) |
2385 | tmp = 1; |
2386 | mins[j][k] = tmp; |
2387 | } |
121aae4b |
2388 | |
7c95608a |
2389 | /* Calculate the (j,j+m) entries for m between 3 and N-1 */ |
2390 | for (m = 3; m < N; m++) { |
2391 | for (j = 0; j < N; j++) { |
2392 | int k = j + m; |
2393 | int u = j + 1; |
2394 | int v = j + 2; |
2395 | int tmp; |
2396 | if (k >= N) k -= N; |
2397 | if (u >= N) u -= N; |
2398 | if (v >= N) v -= N; |
2399 | maxs[j][k] = maxs[j][u] + maxs[u][k]; |
2400 | mins[j][k] = mins[j][u] + mins[u][k]; |
2401 | tmp = maxs[j][v] + maxs[v][k]; |
2402 | maxs[j][k] = min(maxs[j][k], tmp); |
2403 | tmp = mins[j][v] + mins[v][k]; |
2404 | mins[j][k] = max(mins[j][k], tmp); |
2405 | } |
2406 | } |
121aae4b |
2407 | |
7c95608a |
2408 | /* See if we can make any deductions */ |
2409 | for (j = 0; j < N; j++) { |
2410 | int k; |
2411 | grid_edge *e = f->edges[j]; |
2412 | int line_index = e - g->edges; |
2413 | int dline_index; |
121aae4b |
2414 | |
7c95608a |
2415 | if (state->lines[line_index] != LINE_UNKNOWN) |
2416 | continue; |
2417 | k = j + 1; |
2418 | if (k >= N) k = 0; |
121aae4b |
2419 | |
7c95608a |
2420 | /* minimum YESs in the complement of this edge */ |
2421 | if (mins[k][j] > clue) { |
2422 | sstate->solver_status = SOLVER_MISTAKE; |
2423 | return DIFF_EASY; |
2424 | } |
2425 | if (mins[k][j] == clue) { |
2426 | /* setting this edge to YES would make at least |
2427 | * (clue+1) edges - contradiction */ |
2428 | solver_set_line(sstate, line_index, LINE_NO); |
2429 | diff = min(diff, DIFF_EASY); |
2430 | } |
2431 | if (maxs[k][j] < clue - 1) { |
2432 | sstate->solver_status = SOLVER_MISTAKE; |
2433 | return DIFF_EASY; |
2434 | } |
2435 | if (maxs[k][j] == clue - 1) { |
2436 | /* Only way to satisfy the clue is to set edge{j} as YES */ |
2437 | solver_set_line(sstate, line_index, LINE_YES); |
2438 | diff = min(diff, DIFF_EASY); |
2439 | } |
2440 | |
2441 | /* Now see if we can make dline deduction for edges{j,j+1} */ |
2442 | e = f->edges[k]; |
2443 | if (state->lines[e - g->edges] != LINE_UNKNOWN) |
2444 | /* Only worth doing this for an UNKNOWN,UNKNOWN pair. |
2445 | * Dlines where one of the edges is known, are handled in the |
2446 | * dot-deductions */ |
2447 | continue; |
2448 | |
2449 | dline_index = dline_index_from_face(g, f, k); |
2450 | k++; |
2451 | if (k >= N) k = 0; |
2452 | |
2453 | /* minimum YESs in the complement of this dline */ |
2454 | if (mins[k][j] > clue - 2) { |
2455 | /* Adding 2 YESs would break the clue */ |
2456 | if (set_atmostone(dlines, dline_index)) |
2457 | diff = min(diff, DIFF_NORMAL); |
2458 | } |
2459 | /* maximum YESs in the complement of this dline */ |
2460 | if (maxs[k][j] < clue) { |
2461 | /* Adding 2 NOs would mean not enough YESs */ |
2462 | if (set_atleastone(dlines, dline_index)) |
2463 | diff = min(diff, DIFF_NORMAL); |
2464 | } |
6193da8d |
2465 | } |
6193da8d |
2466 | } |
2467 | |
121aae4b |
2468 | if (diff < DIFF_NORMAL) |
2469 | return diff; |
6193da8d |
2470 | |
7c95608a |
2471 | /* ------ Dot deductions ------ */ |
6193da8d |
2472 | |
7c95608a |
2473 | for (i = 0; i < g->num_dots; i++) { |
2474 | grid_dot *d = g->dots + i; |
2475 | int N = d->order; |
2476 | int yes, no, unknown; |
2477 | int j; |
2478 | if (sstate->dot_solved[i]) |
2479 | continue; |
2480 | yes = sstate->dot_yes_count[i]; |
2481 | no = sstate->dot_no_count[i]; |
2482 | unknown = N - yes - no; |
2483 | |
2484 | for (j = 0; j < N; j++) { |
2485 | int k; |
2486 | int dline_index; |
2487 | int line1_index, line2_index; |
2488 | enum line_state line1, line2; |
2489 | k = j + 1; |
2490 | if (k >= N) k = 0; |
2491 | dline_index = dline_index_from_dot(g, d, j); |
2492 | line1_index = d->edges[j] - g->edges; |
2493 | line2_index = d->edges[k] - g->edges; |
2494 | line1 = state->lines[line1_index]; |
2495 | line2 = state->lines[line2_index]; |
2496 | |
2497 | /* Infer dline state from line state */ |
2498 | if (line1 == LINE_NO || line2 == LINE_NO) { |
2499 | if (set_atmostone(dlines, dline_index)) |
2500 | diff = min(diff, DIFF_NORMAL); |
2501 | } |
2502 | if (line1 == LINE_YES || line2 == LINE_YES) { |
2503 | if (set_atleastone(dlines, dline_index)) |
2504 | diff = min(diff, DIFF_NORMAL); |
2505 | } |
2506 | /* Infer line state from dline state */ |
2507 | if (is_atmostone(dlines, dline_index)) { |
2508 | if (line1 == LINE_YES && line2 == LINE_UNKNOWN) { |
2509 | solver_set_line(sstate, line2_index, LINE_NO); |
2510 | diff = min(diff, DIFF_EASY); |
2511 | } |
2512 | if (line2 == LINE_YES && line1 == LINE_UNKNOWN) { |
2513 | solver_set_line(sstate, line1_index, LINE_NO); |
2514 | diff = min(diff, DIFF_EASY); |
2515 | } |
2516 | } |
2517 | if (is_atleastone(dlines, dline_index)) { |
2518 | if (line1 == LINE_NO && line2 == LINE_UNKNOWN) { |
2519 | solver_set_line(sstate, line2_index, LINE_YES); |
2520 | diff = min(diff, DIFF_EASY); |
2521 | } |
2522 | if (line2 == LINE_NO && line1 == LINE_UNKNOWN) { |
2523 | solver_set_line(sstate, line1_index, LINE_YES); |
2524 | diff = min(diff, DIFF_EASY); |
2525 | } |
2526 | } |
2527 | /* Deductions that depend on the numbers of lines. |
2528 | * Only bother if both lines are UNKNOWN, otherwise the |
2529 | * easy-mode solver (or deductions above) would have taken |
2530 | * care of it. */ |
2531 | if (line1 != LINE_UNKNOWN || line2 != LINE_UNKNOWN) |
2532 | continue; |
6193da8d |
2533 | |
7c95608a |
2534 | if (yes == 0 && unknown == 2) { |
2535 | /* Both these unknowns must be identical. If we know |
2536 | * atmostone or atleastone, we can make progress. */ |
2537 | if (is_atmostone(dlines, dline_index)) { |
2538 | solver_set_line(sstate, line1_index, LINE_NO); |
2539 | solver_set_line(sstate, line2_index, LINE_NO); |
2540 | diff = min(diff, DIFF_EASY); |
2541 | } |
2542 | if (is_atleastone(dlines, dline_index)) { |
2543 | solver_set_line(sstate, line1_index, LINE_YES); |
2544 | solver_set_line(sstate, line2_index, LINE_YES); |
2545 | diff = min(diff, DIFF_EASY); |
2546 | } |
2547 | } |
2548 | if (yes == 1) { |
2549 | if (set_atmostone(dlines, dline_index)) |
2550 | diff = min(diff, DIFF_NORMAL); |
2551 | if (unknown == 2) { |
2552 | if (set_atleastone(dlines, dline_index)) |
2553 | diff = min(diff, DIFF_NORMAL); |
2554 | } |
121aae4b |
2555 | } |
6193da8d |
2556 | |
7c95608a |
2557 | /* If we have atleastone set for this dline, infer |
2558 | * atmostone for each "opposite" dline (that is, each |
2559 | * dline without edges in common with this one). |
2560 | * Again, this test is only worth doing if both these |
2561 | * lines are UNKNOWN. For if one of these lines were YES, |
2562 | * the (yes == 1) test above would kick in instead. */ |
2563 | if (is_atleastone(dlines, dline_index)) { |
2564 | int opp; |
2565 | for (opp = 0; opp < N; opp++) { |
2566 | int opp_dline_index; |
2567 | if (opp == j || opp == j+1 || opp == j-1) |
2568 | continue; |
2569 | if (j == 0 && opp == N-1) |
2570 | continue; |
2571 | if (j == N-1 && opp == 0) |
2572 | continue; |
2573 | opp_dline_index = dline_index_from_dot(g, d, opp); |
2574 | if (set_atmostone(dlines, opp_dline_index)) |
2575 | diff = min(diff, DIFF_NORMAL); |
2576 | } |
6193da8d |
2577 | |
7c95608a |
2578 | if (yes == 0 && is_atmostone(dlines, dline_index)) { |
2579 | /* This dline has *exactly* one YES and there are no |
2580 | * other YESs. This allows more deductions. */ |
2581 | if (unknown == 3) { |
2582 | /* Third unknown must be YES */ |
2583 | for (opp = 0; opp < N; opp++) { |
2584 | int opp_index; |
2585 | if (opp == j || opp == k) |
2586 | continue; |
2587 | opp_index = d->edges[opp] - g->edges; |
2588 | if (state->lines[opp_index] == LINE_UNKNOWN) { |
2589 | solver_set_line(sstate, opp_index, LINE_YES); |
2590 | diff = min(diff, DIFF_EASY); |
121aae4b |
2591 | } |
2592 | } |
7c95608a |
2593 | } else if (unknown == 4) { |
2594 | /* Exactly one of opposite UNKNOWNS is YES. We've |
2595 | * already set atmostone, so set atleastone as well. |
2596 | */ |
2597 | if (dline_set_opp_atleastone(sstate, d, j)) |
2598 | diff = min(diff, DIFF_NORMAL); |
121aae4b |
2599 | } |
121aae4b |
2600 | } |
6193da8d |
2601 | } |
6193da8d |
2602 | } |
121aae4b |
2603 | } |
121aae4b |
2604 | return diff; |
6193da8d |
2605 | } |
2606 | |
121aae4b |
2607 | static int hard_mode_deductions(solver_state *sstate) |
6193da8d |
2608 | { |
121aae4b |
2609 | game_state *state = sstate->state; |
7c95608a |
2610 | grid *g = state->game_grid; |
2611 | char *dlines = sstate->normal->dlines; |
2612 | int i; |
1a739e2f |
2613 | int diff = DIFF_MAX; |
7c95608a |
2614 | int diff_tmp; |
121aae4b |
2615 | |
7c95608a |
2616 | /* ------ Face deductions ------ */ |
6193da8d |
2617 | |
7c95608a |
2618 | /* A fully-general linedsf deduction seems overly complicated |
2619 | * (I suspect the problem is NP-complete, though in practice it might just |
2620 | * be doable because faces are limited in size). |
2621 | * For simplicity, we only consider *pairs* of LINE_UNKNOWNS that are |
2622 | * known to be identical. If setting them both to YES (or NO) would break |
2623 | * the clue, set them to NO (or YES). */ |
121aae4b |
2624 | |
7c95608a |
2625 | for (i = 0; i < g->num_faces; i++) { |
2626 | int N, yes, no, unknown; |
2627 | int clue; |
6193da8d |
2628 | |
7c95608a |
2629 | if (sstate->face_solved[i]) |
121aae4b |
2630 | continue; |
7c95608a |
2631 | clue = state->clues[i]; |
2632 | if (clue < 0) |
121aae4b |
2633 | continue; |
6193da8d |
2634 | |
7c95608a |
2635 | N = g->faces[i].order; |
2636 | yes = sstate->face_yes_count[i]; |
2637 | if (yes + 1 == clue) { |
2638 | if (face_setall_identical(sstate, i, LINE_NO)) |
2639 | diff = min(diff, DIFF_EASY); |
121aae4b |
2640 | } |
7c95608a |
2641 | no = sstate->face_no_count[i]; |
2642 | if (no + 1 == N - clue) { |
2643 | if (face_setall_identical(sstate, i, LINE_YES)) |
2644 | diff = min(diff, DIFF_EASY); |
6193da8d |
2645 | } |
6193da8d |
2646 | |
7c95608a |
2647 | /* Reload YES count, it might have changed */ |
2648 | yes = sstate->face_yes_count[i]; |
2649 | unknown = N - no - yes; |
2650 | |
2651 | /* Deductions with small number of LINE_UNKNOWNs, based on overall |
2652 | * parity of lines. */ |
2653 | diff_tmp = parity_deductions(sstate, g->faces[i].edges, |
2654 | (clue - yes) % 2, unknown); |
2655 | diff = min(diff, diff_tmp); |
2656 | } |
2657 | |
2658 | /* ------ Dot deductions ------ */ |
2659 | for (i = 0; i < g->num_dots; i++) { |
2660 | grid_dot *d = g->dots + i; |
2661 | int N = d->order; |
2662 | int j; |
2663 | int yes, no, unknown; |
2664 | /* Go through dlines, and do any dline<->linedsf deductions wherever |
2665 | * we find two UNKNOWNS. */ |
2666 | for (j = 0; j < N; j++) { |
2667 | int dline_index = dline_index_from_dot(g, d, j); |
2668 | int line1_index; |
2669 | int line2_index; |
2670 | int can1, can2, inv1, inv2; |
2671 | int j2; |
2672 | line1_index = d->edges[j] - g->edges; |
2673 | if (state->lines[line1_index] != LINE_UNKNOWN) |
121aae4b |
2674 | continue; |
7c95608a |
2675 | j2 = j + 1; |
2676 | if (j2 == N) j2 = 0; |
2677 | line2_index = d->edges[j2] - g->edges; |
2678 | if (state->lines[line2_index] != LINE_UNKNOWN) |
121aae4b |
2679 | continue; |
7c95608a |
2680 | /* Infer dline flags from linedsf */ |
2681 | can1 = edsf_canonify(sstate->hard->linedsf, line1_index, &inv1); |
2682 | can2 = edsf_canonify(sstate->hard->linedsf, line2_index, &inv2); |
2683 | if (can1 == can2 && inv1 != inv2) { |
2684 | /* These are opposites, so set dline atmostone/atleastone */ |
2685 | if (set_atmostone(dlines, dline_index)) |
2686 | diff = min(diff, DIFF_NORMAL); |
2687 | if (set_atleastone(dlines, dline_index)) |
2688 | diff = min(diff, DIFF_NORMAL); |
121aae4b |
2689 | continue; |
7c95608a |
2690 | } |
2691 | /* Infer linedsf from dline flags */ |
2692 | if (is_atmostone(dlines, dline_index) |
2693 | && is_atleastone(dlines, dline_index)) { |
2694 | if (merge_lines(sstate, line1_index, line2_index, 1)) |
121aae4b |
2695 | diff = min(diff, DIFF_HARD); |
121aae4b |
2696 | } |
2697 | } |
7c95608a |
2698 | |
2699 | /* Deductions with small number of LINE_UNKNOWNs, based on overall |
2700 | * parity of lines. */ |
2701 | yes = sstate->dot_yes_count[i]; |
2702 | no = sstate->dot_no_count[i]; |
2703 | unknown = N - yes - no; |
2704 | diff_tmp = parity_deductions(sstate, d->edges, |
2705 | yes % 2, unknown); |
2706 | diff = min(diff, diff_tmp); |
121aae4b |
2707 | } |
6193da8d |
2708 | |
7c95608a |
2709 | /* ------ Edge dsf deductions ------ */ |
2710 | |
2711 | /* If the state of a line is known, deduce the state of its canonical line |
2712 | * too, and vice versa. */ |
2713 | for (i = 0; i < g->num_edges; i++) { |
2714 | int can, inv; |
2715 | enum line_state s; |
2716 | can = edsf_canonify(sstate->hard->linedsf, i, &inv); |
2717 | if (can == i) |
2718 | continue; |
2719 | s = sstate->state->lines[can]; |
2720 | if (s != LINE_UNKNOWN) { |
2721 | if (solver_set_line(sstate, i, inv ? OPP(s) : s)) |
2722 | diff = min(diff, DIFF_EASY); |
2723 | } else { |
2724 | s = sstate->state->lines[i]; |
2725 | if (s != LINE_UNKNOWN) { |
2726 | if (solver_set_line(sstate, can, inv ? OPP(s) : s)) |
121aae4b |
2727 | diff = min(diff, DIFF_EASY); |
2728 | } |
2729 | } |
2730 | } |
6193da8d |
2731 | |
121aae4b |
2732 | return diff; |
2733 | } |
6193da8d |
2734 | |
121aae4b |
2735 | static int loop_deductions(solver_state *sstate) |
2736 | { |
2737 | int edgecount = 0, clues = 0, satclues = 0, sm1clues = 0; |
2738 | game_state *state = sstate->state; |
7c95608a |
2739 | grid *g = state->game_grid; |
2740 | int shortest_chainlen = g->num_dots; |
121aae4b |
2741 | int loop_found = FALSE; |
121aae4b |
2742 | int dots_connected; |
2743 | int progress = FALSE; |
7c95608a |
2744 | int i; |
6193da8d |
2745 | |
121aae4b |
2746 | /* |
2747 | * Go through the grid and update for all the new edges. |
2748 | * Since merge_dots() is idempotent, the simplest way to |
2749 | * do this is just to update for _all_ the edges. |
7c95608a |
2750 | * Also, while we're here, we count the edges. |
121aae4b |
2751 | */ |
7c95608a |
2752 | for (i = 0; i < g->num_edges; i++) { |
2753 | if (state->lines[i] == LINE_YES) { |
2754 | loop_found |= merge_dots(sstate, i); |
121aae4b |
2755 | edgecount++; |
2756 | } |
7c95608a |
2757 | } |
6193da8d |
2758 | |
7c95608a |
2759 | /* |
2760 | * Count the clues, count the satisfied clues, and count the |
2761 | * satisfied-minus-one clues. |
2762 | */ |
2763 | for (i = 0; i < g->num_faces; i++) { |
2764 | int c = state->clues[i]; |
2765 | if (c >= 0) { |
2766 | int o = sstate->face_yes_count[i]; |
121aae4b |
2767 | if (o == c) |
2768 | satclues++; |
2769 | else if (o == c-1) |
2770 | sm1clues++; |
2771 | clues++; |
2772 | } |
2773 | } |
6193da8d |
2774 | |
7c95608a |
2775 | for (i = 0; i < g->num_dots; ++i) { |
2776 | dots_connected = |
121aae4b |
2777 | sstate->looplen[dsf_canonify(sstate->dotdsf, i)]; |
2778 | if (dots_connected > 1) |
2779 | shortest_chainlen = min(shortest_chainlen, dots_connected); |
6193da8d |
2780 | } |
6193da8d |
2781 | |
121aae4b |
2782 | assert(sstate->solver_status == SOLVER_INCOMPLETE); |
6c42c563 |
2783 | |
121aae4b |
2784 | if (satclues == clues && shortest_chainlen == edgecount) { |
2785 | sstate->solver_status = SOLVER_SOLVED; |
2786 | /* This discovery clearly counts as progress, even if we haven't |
2787 | * just added any lines or anything */ |
7c95608a |
2788 | progress = TRUE; |
121aae4b |
2789 | goto finished_loop_deductionsing; |
2790 | } |
6193da8d |
2791 | |
121aae4b |
2792 | /* |
2793 | * Now go through looking for LINE_UNKNOWN edges which |
2794 | * connect two dots that are already in the same |
2795 | * equivalence class. If we find one, test to see if the |
2796 | * loop it would create is a solution. |
2797 | */ |
7c95608a |
2798 | for (i = 0; i < g->num_edges; i++) { |
2799 | grid_edge *e = g->edges + i; |
2800 | int d1 = e->dot1 - g->dots; |
2801 | int d2 = e->dot2 - g->dots; |
2802 | int eqclass, val; |
2803 | if (state->lines[i] != LINE_UNKNOWN) |
2804 | continue; |
121aae4b |
2805 | |
7c95608a |
2806 | eqclass = dsf_canonify(sstate->dotdsf, d1); |
2807 | if (eqclass != dsf_canonify(sstate->dotdsf, d2)) |
2808 | continue; |
121aae4b |
2809 | |
7c95608a |
2810 | val = LINE_NO; /* loop is bad until proven otherwise */ |
6193da8d |
2811 | |
7c95608a |
2812 | /* |
2813 | * This edge would form a loop. Next |
2814 | * question: how long would the loop be? |
2815 | * Would it equal the total number of edges |
2816 | * (plus the one we'd be adding if we added |
2817 | * it)? |
2818 | */ |
2819 | if (sstate->looplen[eqclass] == edgecount + 1) { |
2820 | int sm1_nearby; |
121aae4b |
2821 | |
2822 | /* |
7c95608a |
2823 | * This edge would form a loop which |
2824 | * took in all the edges in the entire |
2825 | * grid. So now we need to work out |
2826 | * whether it would be a valid solution |
2827 | * to the puzzle, which means we have to |
2828 | * check if it satisfies all the clues. |
2829 | * This means that every clue must be |
2830 | * either satisfied or satisfied-minus- |
2831 | * 1, and also that the number of |
2832 | * satisfied-minus-1 clues must be at |
2833 | * most two and they must lie on either |
2834 | * side of this edge. |
121aae4b |
2835 | */ |
7c95608a |
2836 | sm1_nearby = 0; |
2837 | if (e->face1) { |
2838 | int f = e->face1 - g->faces; |
2839 | int c = state->clues[f]; |
2840 | if (c >= 0 && sstate->face_yes_count[f] == c - 1) |
121aae4b |
2841 | sm1_nearby++; |
6c42c563 |
2842 | } |
7c95608a |
2843 | if (e->face2) { |
2844 | int f = e->face2 - g->faces; |
2845 | int c = state->clues[f]; |
2846 | if (c >= 0 && sstate->face_yes_count[f] == c - 1) |
2847 | sm1_nearby++; |
6c42c563 |
2848 | } |
7c95608a |
2849 | if (sm1clues == sm1_nearby && |
2850 | sm1clues + satclues == clues) { |
2851 | val = LINE_YES; /* loop is good! */ |
6c42c563 |
2852 | } |
121aae4b |
2853 | } |
7c95608a |
2854 | |
2855 | /* |
2856 | * Right. Now we know that adding this edge |
2857 | * would form a loop, and we know whether |
2858 | * that loop would be a viable solution or |
2859 | * not. |
2860 | * |
2861 | * If adding this edge produces a solution, |
2862 | * then we know we've found _a_ solution but |
2863 | * we don't know that it's _the_ solution - |
2864 | * if it were provably the solution then |
2865 | * we'd have deduced this edge some time ago |
2866 | * without the need to do loop detection. So |
2867 | * in this state we return SOLVER_AMBIGUOUS, |
2868 | * which has the effect that hitting Solve |
2869 | * on a user-provided puzzle will fill in a |
2870 | * solution but using the solver to |
2871 | * construct new puzzles won't consider this |
2872 | * a reasonable deduction for the user to |
2873 | * make. |
2874 | */ |
2875 | progress = solver_set_line(sstate, i, val); |
2876 | assert(progress == TRUE); |
2877 | if (val == LINE_YES) { |
2878 | sstate->solver_status = SOLVER_AMBIGUOUS; |
2879 | goto finished_loop_deductionsing; |
2880 | } |
6193da8d |
2881 | } |
6193da8d |
2882 | |
7c95608a |
2883 | finished_loop_deductionsing: |
121aae4b |
2884 | return progress ? DIFF_EASY : DIFF_MAX; |
c0eb17ce |
2885 | } |
6193da8d |
2886 | |
2887 | /* This will return a dynamically allocated solver_state containing the (more) |
2888 | * solved grid */ |
7c95608a |
2889 | static solver_state *solve_game_rec(const solver_state *sstate_start, |
1a739e2f |
2890 | int diff) |
121aae4b |
2891 | { |
7c95608a |
2892 | solver_state *sstate, *sstate_saved; |
121aae4b |
2893 | int solver_progress; |
2894 | game_state *state; |
6193da8d |
2895 | |
121aae4b |
2896 | /* Indicates which solver we should call next. This is a sensible starting |
2897 | * point */ |
2898 | int current_solver = DIFF_EASY, next_solver; |
121aae4b |
2899 | sstate = dup_solver_state(sstate_start); |
7c95608a |
2900 | |
121aae4b |
2901 | /* Cache the values of some variables for readability */ |
2902 | state = sstate->state; |
c0eb17ce |
2903 | |
121aae4b |
2904 | sstate_saved = NULL; |
6193da8d |
2905 | |
121aae4b |
2906 | solver_progress = FALSE; |
99dd160e |
2907 | |
121aae4b |
2908 | check_caches(sstate); |
6193da8d |
2909 | |
121aae4b |
2910 | do { |
121aae4b |
2911 | if (sstate->solver_status == SOLVER_MISTAKE) |
2912 | return sstate; |
2913 | |
121aae4b |
2914 | next_solver = solver_fns[current_solver](sstate); |
2915 | |
2916 | if (next_solver == DIFF_MAX) { |
121aae4b |
2917 | if (current_solver < diff && current_solver + 1 < DIFF_MAX) { |
2918 | /* Try next beefier solver */ |
2919 | next_solver = current_solver + 1; |
2920 | } else { |
121aae4b |
2921 | next_solver = loop_deductions(sstate); |
2922 | } |
2923 | } |
2924 | |
7c95608a |
2925 | if (sstate->solver_status == SOLVER_SOLVED || |
121aae4b |
2926 | sstate->solver_status == SOLVER_AMBIGUOUS) { |
2927 | /* fprintf(stderr, "Solver completed\n"); */ |
2928 | break; |
2929 | } |
99dd160e |
2930 | |
121aae4b |
2931 | /* Once we've looped over all permitted solvers then the loop |
2932 | * deductions without making any progress, we'll exit this while loop */ |
2933 | current_solver = next_solver; |
2934 | } while (current_solver < DIFF_MAX); |
2935 | |
2936 | if (sstate->solver_status == SOLVER_SOLVED || |
2937 | sstate->solver_status == SOLVER_AMBIGUOUS) { |
2938 | /* s/LINE_UNKNOWN/LINE_NO/g */ |
7c95608a |
2939 | array_setall(sstate->state->lines, LINE_UNKNOWN, LINE_NO, |
2940 | sstate->state->game_grid->num_edges); |
121aae4b |
2941 | return sstate; |
2942 | } |
6193da8d |
2943 | |
121aae4b |
2944 | return sstate; |
6193da8d |
2945 | } |
2946 | |
6193da8d |
2947 | static char *solve_game(game_state *state, game_state *currstate, |
2948 | char *aux, char **error) |
2949 | { |
2950 | char *soln = NULL; |
2951 | solver_state *sstate, *new_sstate; |
2952 | |
121aae4b |
2953 | sstate = new_solver_state(state, DIFF_MAX); |
2954 | new_sstate = solve_game_rec(sstate, DIFF_MAX); |
6193da8d |
2955 | |
2956 | if (new_sstate->solver_status == SOLVER_SOLVED) { |
2957 | soln = encode_solve_move(new_sstate->state); |
2958 | } else if (new_sstate->solver_status == SOLVER_AMBIGUOUS) { |
2959 | soln = encode_solve_move(new_sstate->state); |
2960 | /**error = "Solver found ambiguous solutions"; */ |
2961 | } else { |
2962 | soln = encode_solve_move(new_sstate->state); |
2963 | /**error = "Solver failed"; */ |
2964 | } |
2965 | |
2966 | free_solver_state(new_sstate); |
2967 | free_solver_state(sstate); |
2968 | |
2969 | return soln; |
2970 | } |
2971 | |
121aae4b |
2972 | /* ---------------------------------------------------------------------- |
2973 | * Drawing and mouse-handling |
2974 | */ |
6193da8d |
2975 | |
2976 | static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds, |
2977 | int x, int y, int button) |
2978 | { |
7c95608a |
2979 | grid *g = state->game_grid; |
2980 | grid_edge *e; |
2981 | int i; |
6193da8d |
2982 | char *ret, buf[80]; |
2983 | char button_char = ' '; |
2984 | enum line_state old_state; |
2985 | |
2986 | button &= ~MOD_MASK; |
2987 | |
7c95608a |
2988 | /* Convert mouse-click (x,y) to grid coordinates */ |
2989 | x -= BORDER(ds->tilesize); |
2990 | y -= BORDER(ds->tilesize); |
2991 | x = x * g->tilesize / ds->tilesize; |
2992 | y = y * g->tilesize / ds->tilesize; |
2993 | x += g->lowest_x; |
2994 | y += g->lowest_y; |
6193da8d |
2995 | |
7c95608a |
2996 | e = grid_nearest_edge(g, x, y); |
2997 | if (e == NULL) |
6193da8d |
2998 | return NULL; |
2999 | |
7c95608a |
3000 | i = e - g->edges; |
6193da8d |
3001 | |
3002 | /* I think it's only possible to play this game with mouse clicks, sorry */ |
3003 | /* Maybe will add mouse drag support some time */ |
7c95608a |
3004 | old_state = state->lines[i]; |
6193da8d |
3005 | |
3006 | switch (button) { |
7c95608a |
3007 | case LEFT_BUTTON: |
3008 | switch (old_state) { |
3009 | case LINE_UNKNOWN: |
3010 | button_char = 'y'; |
3011 | break; |
3012 | case LINE_YES: |
3013 | case LINE_NO: |
3014 | button_char = 'u'; |
3015 | break; |
3016 | } |
3017 | break; |
3018 | case MIDDLE_BUTTON: |
3019 | button_char = 'u'; |
3020 | break; |
3021 | case RIGHT_BUTTON: |
3022 | switch (old_state) { |
3023 | case LINE_UNKNOWN: |
3024 | button_char = 'n'; |
3025 | break; |
3026 | case LINE_NO: |
3027 | case LINE_YES: |
3028 | button_char = 'u'; |
3029 | break; |
3030 | } |
3031 | break; |
3032 | default: |
3033 | return NULL; |
3034 | } |
3035 | |
3036 | |
3037 | sprintf(buf, "%d%c", i, (int)button_char); |
6193da8d |
3038 | ret = dupstr(buf); |
3039 | |
3040 | return ret; |
3041 | } |
3042 | |
3043 | static game_state *execute_move(game_state *state, char *move) |
3044 | { |
7c95608a |
3045 | int i; |
6193da8d |
3046 | game_state *newstate = dup_game(state); |
3047 | |
3048 | if (move[0] == 'S') { |
3049 | move++; |
3050 | newstate->cheated = TRUE; |
3051 | } |
3052 | |
3053 | while (*move) { |
3054 | i = atoi(move); |
6193da8d |
3055 | move += strspn(move, "1234567890"); |
3056 | switch (*(move++)) { |
7c95608a |
3057 | case 'y': |
3058 | newstate->lines[i] = LINE_YES; |
3059 | break; |
3060 | case 'n': |
3061 | newstate->lines[i] = LINE_NO; |
3062 | break; |
3063 | case 'u': |
3064 | newstate->lines[i] = LINE_UNKNOWN; |
3065 | break; |
3066 | default: |
3067 | goto fail; |
6193da8d |
3068 | } |
3069 | } |
3070 | |
3071 | /* |
3072 | * Check for completion. |
3073 | */ |
b6bf0adc |
3074 | if (check_completion(newstate)) |
121aae4b |
3075 | newstate->solved = TRUE; |
6193da8d |
3076 | |
6193da8d |
3077 | return newstate; |
3078 | |
7c95608a |
3079 | fail: |
6193da8d |
3080 | free_game(newstate); |
3081 | return NULL; |
3082 | } |
3083 | |
3084 | /* ---------------------------------------------------------------------- |
3085 | * Drawing routines. |
3086 | */ |
7c95608a |
3087 | |
3088 | /* Convert from grid coordinates to screen coordinates */ |
3089 | static void grid_to_screen(const game_drawstate *ds, const grid *g, |
3090 | int grid_x, int grid_y, int *x, int *y) |
3091 | { |
3092 | *x = grid_x - g->lowest_x; |
3093 | *y = grid_y - g->lowest_y; |
3094 | *x = *x * ds->tilesize / g->tilesize; |
3095 | *y = *y * ds->tilesize / g->tilesize; |
3096 | *x += BORDER(ds->tilesize); |
3097 | *y += BORDER(ds->tilesize); |
3098 | } |
3099 | |
3100 | /* Returns (into x,y) position of centre of face for rendering the text clue. |
3101 | */ |
3102 | static void face_text_pos(const game_drawstate *ds, const grid *g, |
3103 | const grid_face *f, int *x, int *y) |
3104 | { |
3105 | int i; |
3106 | |
3107 | /* Simplest solution is the centroid. Might not work in some cases. */ |
3108 | |
3109 | /* Another algorithm to look into: |
3110 | * Find the midpoints of the sides, find the bounding-box, |
3111 | * then take the centre of that. */ |
3112 | |
3113 | /* Best solution probably involves incentres (inscribed circles) */ |
3114 | |
3115 | int sx = 0, sy = 0; /* sums */ |
3116 | for (i = 0; i < f->order; i++) { |
3117 | grid_dot *d = f->dots[i]; |
3118 | sx += d->x; |
3119 | sy += d->y; |
3120 | } |
3121 | sx /= f->order; |
3122 | sy /= f->order; |
3123 | |
3124 | /* convert to screen coordinates */ |
3125 | grid_to_screen(ds, g, sx, sy, x, y); |
3126 | } |
3127 | |
6193da8d |
3128 | static void game_redraw(drawing *dr, game_drawstate *ds, game_state *oldstate, |
3129 | game_state *state, int dir, game_ui *ui, |
3130 | float animtime, float flashtime) |
3131 | { |
7c95608a |
3132 | grid *g = state->game_grid; |
3133 | int border = BORDER(ds->tilesize); |
3134 | int i, n; |
6193da8d |
3135 | char c[2]; |
3136 | int line_colour, flash_changed; |
c0eb17ce |
3137 | int clue_mistake; |
7c95608a |
3138 | int clue_satisfied; |
6193da8d |
3139 | |
3140 | if (!ds->started) { |
3141 | /* |
3142 | * The initial contents of the window are not guaranteed and |
3143 | * can vary with front ends. To be on the safe side, all games |
3144 | * should start by drawing a big background-colour rectangle |
3145 | * covering the whole window. |
3146 | */ |
7c95608a |
3147 | int grid_width = g->highest_x - g->lowest_x; |
3148 | int grid_height = g->highest_y - g->lowest_y; |
3149 | int w = grid_width * ds->tilesize / g->tilesize; |
3150 | int h = grid_height * ds->tilesize / g->tilesize; |
6bb2af84 |
3151 | draw_rect(dr, 0, 0, w + 2 * border + 1, h + 2 * border + 1, |
3152 | COL_BACKGROUND); |
6193da8d |
3153 | |
3154 | /* Draw clues */ |
7c95608a |
3155 | for (i = 0; i < g->num_faces; i++) { |
1515b973 |
3156 | grid_face *f; |
3157 | int x, y; |
3158 | |
7c95608a |
3159 | c[0] = CLUE2CHAR(state->clues[i]); |
121aae4b |
3160 | c[1] = '\0'; |
1515b973 |
3161 | f = g->faces + i; |
7c95608a |
3162 | face_text_pos(ds, g, f, &x, &y); |
3163 | draw_text(dr, x, y, FONT_VARIABLE, ds->tilesize/2, |
121aae4b |
3164 | ALIGN_VCENTRE | ALIGN_HCENTRE, COL_FOREGROUND, c); |
6193da8d |
3165 | } |
7c95608a |
3166 | draw_update(dr, 0, 0, w + 2 * border, h + 2 * border); |
6193da8d |
3167 | } |
3168 | |
7c95608a |
3169 | if (flashtime > 0 && |
6193da8d |
3170 | (flashtime <= FLASH_TIME/3 || |
3171 | flashtime >= FLASH_TIME*2/3)) { |
3172 | flash_changed = !ds->flashing; |
3173 | ds->flashing = TRUE; |
6193da8d |
3174 | } else { |
3175 | flash_changed = ds->flashing; |
3176 | ds->flashing = FALSE; |
6193da8d |
3177 | } |
3178 | |
7c95608a |
3179 | /* Some platforms may perform anti-aliasing, which may prevent clean |
3180 | * repainting of lines when the colour is changed. |
3181 | * If a line needs to be over-drawn in a different colour, erase a |
3182 | * bounding-box around the line, then flag all nearby objects for redraw. |
3183 | */ |
3184 | if (ds->started) { |
3466f373 |
3185 | const char redraw_flag = (char)(1<<7); |
7c95608a |
3186 | for (i = 0; i < g->num_edges; i++) { |
b6bf0adc |
3187 | char prev_ds = (ds->lines[i] & ~redraw_flag); |
3188 | char new_ds = state->lines[i]; |
3189 | if (state->line_errors[i]) |
3190 | new_ds = DS_LINE_ERROR; |
3191 | |
7c95608a |
3192 | /* If we're changing state, AND |
3193 | * the previous state was a coloured line */ |
b6bf0adc |
3194 | if ((prev_ds != new_ds) && (prev_ds != LINE_NO)) { |
7c95608a |
3195 | grid_edge *e = g->edges + i; |
3196 | int x1 = e->dot1->x; |
3197 | int y1 = e->dot1->y; |
3198 | int x2 = e->dot2->x; |
3199 | int y2 = e->dot2->y; |
3200 | int xmin, xmax, ymin, ymax; |
3201 | int j; |
3202 | grid_to_screen(ds, g, x1, y1, &x1, &y1); |
3203 | grid_to_screen(ds, g, x2, y2, &x2, &y2); |
3204 | /* Allow extra margin for dots, and thickness of lines */ |
3205 | xmin = min(x1, x2) - 2; |
3206 | xmax = max(x1, x2) + 2; |
3207 | ymin = min(y1, y2) - 2; |
3208 | ymax = max(y1, y2) + 2; |
3209 | /* For testing, I find it helpful to change COL_BACKGROUND |
3210 | * to COL_SATISFIED here. */ |
3211 | draw_rect(dr, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1, |
3212 | COL_BACKGROUND); |
3213 | draw_update(dr, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1); |
3214 | |
3215 | /* Mark nearby lines for redraw */ |
3216 | for (j = 0; j < e->dot1->order; j++) |
3217 | ds->lines[e->dot1->edges[j] - g->edges] |= redraw_flag; |
3218 | for (j = 0; j < e->dot2->order; j++) |
3219 | ds->lines[e->dot2->edges[j] - g->edges] |= redraw_flag; |
3220 | /* Mark nearby clues for redraw. Use a value that is |
3221 | * neither TRUE nor FALSE for this. */ |
3222 | if (e->face1) |
3223 | ds->clue_error[e->face1 - g->faces] = 2; |
3224 | if (e->face2) |
3225 | ds->clue_error[e->face2 - g->faces] = 2; |
3226 | } |
3227 | } |
3228 | } |
3229 | |
c0eb17ce |
3230 | /* Redraw clue colours if necessary */ |
7c95608a |
3231 | for (i = 0; i < g->num_faces; i++) { |
3232 | grid_face *f = g->faces + i; |
3233 | int sides = f->order; |
3234 | int j; |
3235 | n = state->clues[i]; |
121aae4b |
3236 | if (n < 0) |
3237 | continue; |
c0eb17ce |
3238 | |
7c95608a |
3239 | c[0] = CLUE2CHAR(n); |
121aae4b |
3240 | c[1] = '\0'; |
3241 | |
7c95608a |
3242 | clue_mistake = (face_order(state, i, LINE_YES) > n || |
3243 | face_order(state, i, LINE_NO ) > (sides-n)); |
3244 | |
3245 | clue_satisfied = (face_order(state, i, LINE_YES) == n && |
3246 | face_order(state, i, LINE_NO ) == (sides-n)); |
3247 | |
3248 | if (clue_mistake != ds->clue_error[i] |
3249 | || clue_satisfied != ds->clue_satisfied[i]) { |
3250 | int x, y; |
3251 | face_text_pos(ds, g, f, &x, &y); |
3252 | /* There seems to be a certain amount of trial-and-error |
3253 | * involved in working out the correct bounding-box for |
3254 | * the text. */ |
3255 | draw_rect(dr, x - ds->tilesize/4 - 1, y - ds->tilesize/4 - 3, |
3256 | ds->tilesize/2 + 2, ds->tilesize/2 + 5, |
121aae4b |
3257 | COL_BACKGROUND); |
7c95608a |
3258 | draw_text(dr, x, y, |
3259 | FONT_VARIABLE, ds->tilesize/2, |
3260 | ALIGN_VCENTRE | ALIGN_HCENTRE, |
3261 | clue_mistake ? COL_MISTAKE : |
3262 | clue_satisfied ? COL_SATISFIED : COL_FOREGROUND, c); |
3263 | draw_update(dr, x - ds->tilesize/4 - 1, y - ds->tilesize/4 - 3, |
3264 | ds->tilesize/2 + 2, ds->tilesize/2 + 5); |
3265 | |
3266 | ds->clue_error[i] = clue_mistake; |
3267 | ds->clue_satisfied[i] = clue_satisfied; |
3268 | |
3269 | /* Sometimes, the bounding-box encroaches into the surrounding |
3270 | * lines (particularly if the window is resized fairly small). |
3271 | * So redraw them. */ |
3272 | for (j = 0; j < f->order; j++) |
3273 | ds->lines[f->edges[j] - g->edges] = -1; |
c0eb17ce |
3274 | } |
3275 | } |
3276 | |
7c95608a |
3277 | /* Lines */ |
3278 | for (i = 0; i < g->num_edges; i++) { |
3279 | grid_edge *e = g->edges + i; |
3280 | int x1, x2, y1, y2; |
3281 | int xmin, ymin, xmax, ymax; |
b6bf0adc |
3282 | char new_ds, need_draw; |
3283 | new_ds = state->lines[i]; |
3284 | if (state->line_errors[i]) |
3285 | new_ds = DS_LINE_ERROR; |
3286 | need_draw = (new_ds != ds->lines[i]) ? TRUE : FALSE; |
7c95608a |
3287 | if (flash_changed && (state->lines[i] == LINE_YES)) |
3288 | need_draw = TRUE; |
3289 | if (!ds->started) |
3290 | need_draw = TRUE; /* draw everything at the start */ |
b6bf0adc |
3291 | ds->lines[i] = new_ds; |
7c95608a |
3292 | if (!need_draw) |
3293 | continue; |
b6bf0adc |
3294 | if (state->line_errors[i]) |
3295 | line_colour = COL_MISTAKE; |
3296 | else if (state->lines[i] == LINE_UNKNOWN) |
7c95608a |
3297 | line_colour = COL_LINEUNKNOWN; |
3298 | else if (state->lines[i] == LINE_NO) |
3299 | line_colour = COL_BACKGROUND; |
3300 | else if (ds->flashing) |
3301 | line_colour = COL_HIGHLIGHT; |
3302 | else |
3303 | line_colour = COL_FOREGROUND; |
3304 | |
3305 | /* Convert from grid to screen coordinates */ |
3306 | grid_to_screen(ds, g, e->dot1->x, e->dot1->y, &x1, &y1); |
3307 | grid_to_screen(ds, g, e->dot2->x, e->dot2->y, &x2, &y2); |
3308 | |
3309 | xmin = min(x1, x2); |
3310 | xmax = max(x1, x2); |
3311 | ymin = min(y1, y2); |
3312 | ymax = max(y1, y2); |
3313 | |
3314 | if (line_colour != COL_BACKGROUND) { |
3315 | /* (dx, dy) points roughly from (x1, y1) to (x2, y2). |
3316 | * The line is then "fattened" in a (roughly) perpendicular |
3317 | * direction to create a thin rectangle. */ |
3318 | int dx = (x1 > x2) ? -1 : ((x1 < x2) ? 1 : 0); |
3319 | int dy = (y1 > y2) ? -1 : ((y1 < y2) ? 1 : 0); |
3466f373 |
3320 | int points[8]; |
3321 | points[0] = x1 + dy; |
3322 | points[1] = y1 - dx; |
3323 | points[2] = x1 - dy; |
3324 | points[3] = y1 + dx; |
3325 | points[4] = x2 - dy; |
3326 | points[5] = y2 + dx; |
3327 | points[6] = x2 + dy; |
3328 | points[7] = y2 - dx; |
7c95608a |
3329 | draw_polygon(dr, points, 4, line_colour, line_colour); |
3330 | } |
3331 | if (ds->started) { |
3332 | /* Draw dots at ends of the line */ |
3333 | draw_circle(dr, x1, y1, 2, COL_FOREGROUND, COL_FOREGROUND); |
3334 | draw_circle(dr, x2, y2, 2, COL_FOREGROUND, COL_FOREGROUND); |
6193da8d |
3335 | } |
7c95608a |
3336 | draw_update(dr, xmin-2, ymin-2, xmax - xmin + 4, ymax - ymin + 4); |
6193da8d |
3337 | } |
3338 | |
7c95608a |
3339 | /* Draw dots */ |
3340 | if (!ds->started) { |
3341 | for (i = 0; i < g->num_dots; i++) { |
3342 | grid_dot *d = g->dots + i; |
3343 | int x, y; |
3344 | grid_to_screen(ds, g, d->x, d->y, &x, &y); |
3345 | draw_circle(dr, x, y, 2, COL_FOREGROUND, COL_FOREGROUND); |
6193da8d |
3346 | } |
3347 | } |
7c95608a |
3348 | ds->started = TRUE; |
6193da8d |
3349 | } |
3350 | |
6193da8d |
3351 | static float game_flash_length(game_state *oldstate, game_state *newstate, |
3352 | int dir, game_ui *ui) |
3353 | { |
3354 | if (!oldstate->solved && newstate->solved && |
3355 | !oldstate->cheated && !newstate->cheated) { |
3356 | return FLASH_TIME; |
3357 | } |
3358 | |
3359 | return 0.0F; |
3360 | } |
3361 | |
6193da8d |
3362 | static void game_print_size(game_params *params, float *x, float *y) |
3363 | { |
3364 | int pw, ph; |
3365 | |
3366 | /* |
7c95608a |
3367 | * I'll use 7mm "squares" by default. |
6193da8d |
3368 | */ |
3369 | game_compute_size(params, 700, &pw, &ph); |
3370 | *x = pw / 100.0F; |
3371 | *y = ph / 100.0F; |
3372 | } |
3373 | |
3374 | static void game_print(drawing *dr, game_state *state, int tilesize) |
3375 | { |
6193da8d |
3376 | int ink = print_mono_colour(dr, 0); |
7c95608a |
3377 | int i; |
6193da8d |
3378 | game_drawstate ads, *ds = &ads; |
7c95608a |
3379 | grid *g = state->game_grid; |
4413ef0f |
3380 | |
3381 | game_set_size(dr, ds, NULL, tilesize); |
6193da8d |
3382 | |
7c95608a |
3383 | for (i = 0; i < g->num_dots; i++) { |
3384 | int x, y; |
3385 | grid_to_screen(ds, g, g->dots[i].x, g->dots[i].y, &x, &y); |
3386 | draw_circle(dr, x, y, ds->tilesize / 15, ink, ink); |
121aae4b |
3387 | } |
6193da8d |
3388 | |
3389 | /* |
3390 | * Clues. |
3391 | */ |
7c95608a |
3392 | for (i = 0; i < g->num_faces; i++) { |
3393 | grid_face *f = g->faces + i; |
3394 | int clue = state->clues[i]; |
3395 | if (clue >= 0) { |
121aae4b |
3396 | char c[2]; |
7c95608a |
3397 | int x, y; |
3398 | c[0] = CLUE2CHAR(clue); |
121aae4b |
3399 | c[1] = '\0'; |
7c95608a |
3400 | face_text_pos(ds, g, f, &x, &y); |
3401 | draw_text(dr, x, y, |
3402 | FONT_VARIABLE, ds->tilesize / 2, |
121aae4b |
3403 | ALIGN_VCENTRE | ALIGN_HCENTRE, ink, c); |
3404 | } |
3405 | } |
6193da8d |
3406 | |
3407 | /* |
7c95608a |
3408 | * Lines. |
6193da8d |
3409 | */ |
7c95608a |
3410 | for (i = 0; i < g->num_edges; i++) { |
3411 | int thickness = (state->lines[i] == LINE_YES) ? 30 : 150; |
3412 | grid_edge *e = g->edges + i; |
3413 | int x1, y1, x2, y2; |
3414 | grid_to_screen(ds, g, e->dot1->x, e->dot1->y, &x1, &y1); |
3415 | grid_to_screen(ds, g, e->dot2->x, e->dot2->y, &x2, &y2); |
3416 | if (state->lines[i] == LINE_YES) |
3417 | { |
3418 | /* (dx, dy) points from (x1, y1) to (x2, y2). |
3419 | * The line is then "fattened" in a perpendicular |
3420 | * direction to create a thin rectangle. */ |
3421 | double d = sqrt(SQ((double)x1 - x2) + SQ((double)y1 - y2)); |
3422 | double dx = (x2 - x1) / d; |
3423 | double dy = (y2 - y1) / d; |
1515b973 |
3424 | int points[8]; |
3425 | |
7c95608a |
3426 | dx = (dx * ds->tilesize) / thickness; |
3427 | dy = (dy * ds->tilesize) / thickness; |
b1535c90 |
3428 | points[0] = x1 + (int)dy; |
3429 | points[1] = y1 - (int)dx; |
3430 | points[2] = x1 - (int)dy; |
3431 | points[3] = y1 + (int)dx; |
3432 | points[4] = x2 - (int)dy; |
3433 | points[5] = y2 + (int)dx; |
3434 | points[6] = x2 + (int)dy; |
3435 | points[7] = y2 - (int)dx; |
7c95608a |
3436 | draw_polygon(dr, points, 4, ink, ink); |
3437 | } |
3438 | else |
3439 | { |
3440 | /* Draw a dotted line */ |
3441 | int divisions = 6; |
3442 | int j; |
3443 | for (j = 1; j < divisions; j++) { |
3444 | /* Weighted average */ |
3445 | int x = (x1 * (divisions -j) + x2 * j) / divisions; |
3446 | int y = (y1 * (divisions -j) + y2 * j) / divisions; |
3447 | draw_circle(dr, x, y, ds->tilesize / thickness, ink, ink); |
3448 | } |
3449 | } |
121aae4b |
3450 | } |
6193da8d |
3451 | } |
3452 | |
3453 | #ifdef COMBINED |
3454 | #define thegame loopy |
3455 | #endif |
3456 | |
3457 | const struct game thegame = { |
750037d7 |
3458 | "Loopy", "games.loopy", "loopy", |
6193da8d |
3459 | default_params, |
3460 | game_fetch_preset, |
3461 | decode_params, |
3462 | encode_params, |
3463 | free_params, |
3464 | dup_params, |
3465 | TRUE, game_configure, custom_params, |
3466 | validate_params, |
3467 | new_game_desc, |
3468 | validate_desc, |
3469 | new_game, |
3470 | dup_game, |
3471 | free_game, |
3472 | 1, solve_game, |
fa3abef5 |
3473 | TRUE, game_can_format_as_text_now, game_text_format, |
6193da8d |
3474 | new_ui, |
3475 | free_ui, |
3476 | encode_ui, |
3477 | decode_ui, |
3478 | game_changed_state, |
3479 | interpret_move, |
3480 | execute_move, |
3481 | PREFERRED_TILE_SIZE, game_compute_size, game_set_size, |
3482 | game_colours, |
3483 | game_new_drawstate, |
3484 | game_free_drawstate, |
3485 | game_redraw, |
3486 | game_anim_length, |
3487 | game_flash_length, |
3488 | TRUE, FALSE, game_print_size, game_print, |
121aae4b |
3489 | FALSE /* wants_statusbar */, |
6193da8d |
3490 | FALSE, game_timing_state, |
121aae4b |
3491 | 0, /* mouse_priorities */ |
6193da8d |
3492 | }; |