ac511ec9 |
1 | /* |
2 | * slide.c: Implementation of the block-sliding puzzle `Klotski'. |
3 | */ |
4 | |
5 | /* |
6 | * TODO: |
7 | * |
ac511ec9 |
8 | * - The dragging semantics are still subtly wrong in complex |
9 | * cases. |
10 | * |
11 | * - Improve the generator. |
39bdcaad |
12 | * * actually, we seem to be mostly sensible already now. I |
13 | * want more choice over the type of main block and location |
14 | * of the exit/target, and I think I probably ought to give |
15 | * up on compactness and just bite the bullet and have the |
16 | * target area right outside the main wall, but mostly I |
17 | * think it's OK. |
b83e4849 |
18 | * * the move limit tends to make the game _slower_ to |
19 | * generate, which is odd. Perhaps investigate why. |
ac511ec9 |
20 | * |
39bdcaad |
21 | * - Improve the graphics. |
22 | * * All the colours are a bit wishy-washy. _Some_ dark |
23 | * colours would surely not be excessive? Probably darken |
24 | * the tiles, the walls and the main block, and leave the |
25 | * target marker pale. |
26 | * * The cattle grid effect is still disgusting. Think of |
27 | * something completely different. |
a60aa018 |
28 | * * I think TRCIRC and BLCIRC should actually be drawn, as a |
29 | * pair of differently coloured octants. Haul out the |
30 | * Bresenham code, I suspect. |
31 | * * The highlight for next-piece-to-move in the solver is |
32 | * excessive, and the shadow blends in too well with the |
33 | * piece lowlights. Adjust both. |
ac511ec9 |
34 | */ |
35 | |
36 | #include <stdio.h> |
37 | #include <stdlib.h> |
38 | #include <string.h> |
39 | #include <assert.h> |
40 | #include <ctype.h> |
41 | #include <math.h> |
42 | |
43 | #include "puzzles.h" |
44 | #include "tree234.h" |
45 | |
46 | /* |
47 | * The implementation of this game revolves around the insight |
48 | * which makes an exhaustive-search solver feasible: although |
49 | * there are many blocks which can be rearranged in many ways, any |
50 | * two blocks of the same shape are _indistinguishable_ and hence |
51 | * the number of _distinct_ board layouts is generally much |
52 | * smaller. So we adopt a representation for board layouts which |
53 | * is inherently canonical, i.e. there are no two distinct |
54 | * representations which encode indistinguishable layouts. |
55 | * |
56 | * The way we do this is to encode each square of the board, in |
57 | * the normal left-to-right top-to-bottom order, as being one of |
58 | * the following things: |
59 | * - the first square (in the given order) of a block (`anchor') |
60 | * - special case of the above: the anchor for the _main_ block |
61 | * (i.e. the one which the aim of the game is to get to the |
62 | * target position) |
63 | * - a subsequent square of a block whose previous square was N |
64 | * squares ago |
65 | * - an impassable wall |
66 | * |
67 | * (We also separately store data about which board positions are |
68 | * forcefields only passable by the main block. We can't encode |
69 | * that in the main board data, because then the main block would |
70 | * destroy forcefields as it went over them.) |
71 | * |
72 | * Hence, for example, a 2x2 square block would be encoded as |
73 | * ANCHOR, followed by DIST(1), and w-2 squares later on there |
74 | * would be DIST(w-1) followed by DIST(1). So if you start at the |
75 | * last of those squares, the DIST numbers give you a linked list |
76 | * pointing back through all the other squares in the same block. |
77 | * |
78 | * So the solver simply does a bfs over all reachable positions, |
79 | * encoding them in this format and storing them in a tree234 to |
80 | * ensure it doesn't ever revisit an already-analysed position. |
81 | */ |
82 | |
83 | enum { |
84 | /* |
85 | * The colours are arranged here so that every base colour is |
86 | * directly followed by its highlight colour and then its |
87 | * lowlight colour. Do not break this, or draw_tile() will get |
88 | * confused. |
89 | */ |
90 | COL_BACKGROUND, |
91 | COL_HIGHLIGHT, |
92 | COL_LOWLIGHT, |
93 | COL_DRAGGING, |
94 | COL_DRAGGING_HIGHLIGHT, |
95 | COL_DRAGGING_LOWLIGHT, |
96 | COL_MAIN, |
97 | COL_MAIN_HIGHLIGHT, |
98 | COL_MAIN_LOWLIGHT, |
99 | COL_MAIN_DRAGGING, |
100 | COL_MAIN_DRAGGING_HIGHLIGHT, |
101 | COL_MAIN_DRAGGING_LOWLIGHT, |
102 | COL_TARGET, |
103 | COL_TARGET_HIGHLIGHT, |
104 | COL_TARGET_LOWLIGHT, |
105 | NCOLOURS |
106 | }; |
107 | |
108 | /* |
109 | * Board layout is a simple array of bytes. Each byte holds: |
110 | */ |
111 | #define ANCHOR 255 /* top-left-most square of some piece */ |
112 | #define MAINANCHOR 254 /* anchor of _main_ piece */ |
113 | #define EMPTY 253 /* empty square */ |
114 | #define WALL 252 /* immovable wall */ |
115 | #define MAXDIST 251 |
116 | /* all other values indicate distance back to previous square of same block */ |
117 | #define ISDIST(x) ( (unsigned char)((x)-1) <= MAXDIST-1 ) |
118 | #define DIST(x) (x) |
119 | #define ISANCHOR(x) ( (x)==ANCHOR || (x)==MAINANCHOR ) |
120 | #define ISBLOCK(x) ( ISANCHOR(x) || ISDIST(x) ) |
121 | |
122 | /* |
123 | * MAXDIST is the largest DIST value we can encode. This must |
124 | * therefore also be the maximum puzzle width in theory (although |
125 | * solver running time will dictate a much smaller limit in |
126 | * practice). |
127 | */ |
128 | #define MAXWID MAXDIST |
129 | |
130 | struct game_params { |
131 | int w, h; |
b83e4849 |
132 | int maxmoves; |
ac511ec9 |
133 | }; |
134 | |
135 | struct game_immutable_state { |
136 | int refcount; |
137 | unsigned char *forcefield; |
138 | }; |
139 | |
a60aa018 |
140 | struct game_solution { |
141 | int nmoves; |
142 | int *moves; /* just like from solve_board() */ |
143 | int refcount; |
144 | }; |
145 | |
ac511ec9 |
146 | struct game_state { |
147 | int w, h; |
148 | unsigned char *board; |
149 | int tx, ty; /* target coords for MAINANCHOR */ |
150 | int minmoves; /* for display only */ |
151 | int lastmoved, lastmoved_pos; /* for move counting */ |
152 | int movecount; |
153 | int completed; |
a60aa018 |
154 | int cheated; |
ac511ec9 |
155 | struct game_immutable_state *imm; |
a60aa018 |
156 | struct game_solution *soln; |
157 | int soln_index; |
ac511ec9 |
158 | }; |
159 | |
160 | static game_params *default_params(void) |
161 | { |
162 | game_params *ret = snew(game_params); |
163 | |
b83e4849 |
164 | ret->w = 7; |
ac511ec9 |
165 | ret->h = 6; |
b83e4849 |
166 | ret->maxmoves = 40; |
ac511ec9 |
167 | |
168 | return ret; |
169 | } |
170 | |
171 | static const struct game_params slide_presets[] = { |
b83e4849 |
172 | {7, 6, 25}, |
173 | {7, 6, -1}, |
174 | {8, 6, -1}, |
ac511ec9 |
175 | }; |
176 | |
177 | static int game_fetch_preset(int i, char **name, game_params **params) |
178 | { |
179 | game_params *ret; |
180 | char str[80]; |
181 | |
182 | if (i < 0 || i >= lenof(slide_presets)) |
183 | return FALSE; |
184 | |
185 | ret = snew(game_params); |
186 | *ret = slide_presets[i]; |
187 | |
188 | sprintf(str, "%dx%d", ret->w, ret->h); |
b83e4849 |
189 | if (ret->maxmoves >= 0) |
190 | sprintf(str + strlen(str), ", max %d moves", ret->maxmoves); |
191 | else |
192 | sprintf(str + strlen(str), ", no move limit"); |
ac511ec9 |
193 | |
194 | *name = dupstr(str); |
195 | *params = ret; |
196 | return TRUE; |
197 | } |
198 | |
199 | static void free_params(game_params *params) |
200 | { |
201 | sfree(params); |
202 | } |
203 | |
204 | static game_params *dup_params(game_params *params) |
205 | { |
206 | game_params *ret = snew(game_params); |
207 | *ret = *params; /* structure copy */ |
208 | return ret; |
209 | } |
210 | |
211 | static void decode_params(game_params *params, char const *string) |
212 | { |
213 | params->w = params->h = atoi(string); |
214 | while (*string && isdigit((unsigned char)*string)) string++; |
215 | if (*string == 'x') { |
216 | string++; |
217 | params->h = atoi(string); |
b83e4849 |
218 | while (*string && isdigit((unsigned char)*string)) string++; |
219 | } |
220 | if (*string == 'm') { |
221 | string++; |
222 | params->maxmoves = atoi(string); |
223 | while (*string && isdigit((unsigned char)*string)) string++; |
224 | } else if (*string == 'u') { |
225 | string++; |
226 | params->maxmoves = -1; |
ac511ec9 |
227 | } |
228 | } |
229 | |
230 | static char *encode_params(game_params *params, int full) |
231 | { |
232 | char data[256]; |
233 | |
234 | sprintf(data, "%dx%d", params->w, params->h); |
b83e4849 |
235 | if (params->maxmoves >= 0) |
236 | sprintf(data + strlen(data), "m%d", params->maxmoves); |
237 | else |
238 | sprintf(data + strlen(data), "u"); |
ac511ec9 |
239 | |
240 | return dupstr(data); |
241 | } |
242 | |
243 | static config_item *game_configure(game_params *params) |
244 | { |
245 | config_item *ret; |
246 | char buf[80]; |
247 | |
b83e4849 |
248 | ret = snewn(4, config_item); |
ac511ec9 |
249 | |
250 | ret[0].name = "Width"; |
251 | ret[0].type = C_STRING; |
252 | sprintf(buf, "%d", params->w); |
253 | ret[0].sval = dupstr(buf); |
254 | ret[0].ival = 0; |
255 | |
256 | ret[1].name = "Height"; |
257 | ret[1].type = C_STRING; |
258 | sprintf(buf, "%d", params->h); |
259 | ret[1].sval = dupstr(buf); |
260 | ret[1].ival = 0; |
261 | |
b83e4849 |
262 | ret[2].name = "Solution length limit"; |
263 | ret[2].type = C_STRING; |
264 | sprintf(buf, "%d", params->maxmoves); |
265 | ret[2].sval = dupstr(buf); |
ac511ec9 |
266 | ret[2].ival = 0; |
267 | |
b83e4849 |
268 | ret[3].name = NULL; |
269 | ret[3].type = C_END; |
270 | ret[3].sval = NULL; |
271 | ret[3].ival = 0; |
272 | |
ac511ec9 |
273 | return ret; |
274 | } |
275 | |
276 | static game_params *custom_params(config_item *cfg) |
277 | { |
278 | game_params *ret = snew(game_params); |
279 | |
280 | ret->w = atoi(cfg[0].sval); |
281 | ret->h = atoi(cfg[1].sval); |
b83e4849 |
282 | ret->maxmoves = atoi(cfg[2].sval); |
ac511ec9 |
283 | |
284 | return ret; |
285 | } |
286 | |
287 | static char *validate_params(game_params *params, int full) |
288 | { |
289 | if (params->w > MAXWID) |
290 | return "Width must be at most " STR(MAXWID); |
291 | |
292 | if (params->w < 5) |
293 | return "Width must be at least 5"; |
294 | if (params->h < 4) |
295 | return "Height must be at least 4"; |
296 | |
297 | return NULL; |
298 | } |
299 | |
300 | static char *board_text_format(int w, int h, unsigned char *data, |
301 | unsigned char *forcefield) |
302 | { |
303 | int wh = w*h; |
304 | int *dsf = snew_dsf(wh); |
305 | int i, x, y; |
306 | int retpos, retlen = (w*2+2)*(h*2+1)+1; |
307 | char *ret = snewn(retlen, char); |
308 | |
309 | for (i = 0; i < wh; i++) |
310 | if (ISDIST(data[i])) |
311 | dsf_merge(dsf, i - data[i], i); |
312 | retpos = 0; |
313 | for (y = 0; y < 2*h+1; y++) { |
314 | for (x = 0; x < 2*w+1; x++) { |
315 | int v; |
316 | int i = (y/2)*w+(x/2); |
317 | |
318 | #define dtype(i) (ISBLOCK(data[i]) ? \ |
319 | dsf_canonify(dsf, i) : data[i]) |
320 | #define dchar(t) ((t)==EMPTY ? ' ' : (t)==WALL ? '#' : \ |
321 | data[t] == MAINANCHOR ? '*' : '%') |
322 | |
323 | if (y % 2 && x % 2) { |
324 | int j = dtype(i); |
325 | v = dchar(j); |
326 | } else if (y % 2 && !(x % 2)) { |
327 | int j1 = (x > 0 ? dtype(i-1) : -1); |
328 | int j2 = (x < 2*w ? dtype(i) : -1); |
329 | if (j1 != j2) |
330 | v = '|'; |
331 | else |
332 | v = dchar(j1); |
333 | } else if (!(y % 2) && (x % 2)) { |
334 | int j1 = (y > 0 ? dtype(i-w) : -1); |
335 | int j2 = (y < 2*h ? dtype(i) : -1); |
336 | if (j1 != j2) |
337 | v = '-'; |
338 | else |
339 | v = dchar(j1); |
340 | } else { |
341 | int j1 = (x > 0 && y > 0 ? dtype(i-w-1) : -1); |
342 | int j2 = (x > 0 && y < 2*h ? dtype(i-1) : -1); |
343 | int j3 = (x < 2*w && y > 0 ? dtype(i-w) : -1); |
344 | int j4 = (x < 2*w && y < 2*h ? dtype(i) : -1); |
345 | if (j1 == j2 && j2 == j3 && j3 == j4) |
346 | v = dchar(j1); |
347 | else if (j1 == j2 && j3 == j4) |
348 | v = '|'; |
349 | else if (j1 == j3 && j2 == j4) |
350 | v = '-'; |
351 | else |
352 | v = '+'; |
353 | } |
354 | |
355 | assert(retpos < retlen); |
356 | ret[retpos++] = v; |
357 | } |
358 | assert(retpos < retlen); |
359 | ret[retpos++] = '\n'; |
360 | } |
361 | assert(retpos < retlen); |
362 | ret[retpos++] = '\0'; |
363 | assert(retpos == retlen); |
364 | |
365 | return ret; |
366 | } |
367 | |
368 | /* ---------------------------------------------------------------------- |
369 | * Solver. |
370 | */ |
371 | |
372 | /* |
373 | * During solver execution, the set of visited board positions is |
374 | * stored as a tree234 of the following structures. `w', `h' and |
375 | * `data' are obvious in meaning; `dist' represents the minimum |
376 | * distance to reach this position from the starting point. |
377 | * |
378 | * `prev' links each board to the board position from which it was |
379 | * most efficiently derived. |
380 | */ |
381 | struct board { |
382 | int w, h; |
383 | int dist; |
384 | struct board *prev; |
385 | unsigned char *data; |
386 | }; |
387 | |
388 | static int boardcmp(void *av, void *bv) |
389 | { |
390 | struct board *a = (struct board *)av; |
391 | struct board *b = (struct board *)bv; |
392 | return memcmp(a->data, b->data, a->w * a->h); |
393 | } |
394 | |
395 | static struct board *newboard(int w, int h, unsigned char *data) |
396 | { |
397 | struct board *b = malloc(sizeof(struct board) + w*h); |
398 | b->data = (unsigned char *)b + sizeof(struct board); |
399 | memcpy(b->data, data, w*h); |
400 | b->w = w; |
401 | b->h = h; |
402 | b->dist = -1; |
403 | b->prev = NULL; |
404 | return b; |
405 | } |
406 | |
407 | /* |
408 | * The actual solver. Given a board, attempt to find the minimum |
409 | * length of move sequence which moves MAINANCHOR to (tx,ty), or |
b48c4c04 |
410 | * -1 if no solution exists. Returns that minimum length. |
411 | * |
412 | * Also, if `moveout' is provided, writes out the moves in the |
413 | * form of a sequence of pairs of integers indicating the source |
414 | * and destination points of the anchor of the moved piece in each |
415 | * move. Exactly twice as many integers are written as the number |
416 | * returned from solve_board(), and `moveout' receives an int * |
417 | * which is a pointer to a dynamically allocated array. |
ac511ec9 |
418 | */ |
419 | static int solve_board(int w, int h, unsigned char *board, |
b83e4849 |
420 | unsigned char *forcefield, int tx, int ty, |
b48c4c04 |
421 | int movelimit, int **moveout) |
ac511ec9 |
422 | { |
423 | int wh = w*h; |
424 | struct board *b, *b2, *b3; |
425 | int *next, *anchors, *which; |
426 | int *movereached, *movequeue, mqhead, mqtail; |
427 | tree234 *sorted, *queue; |
428 | int i, j, dir; |
429 | int qlen, lastdist; |
430 | int ret; |
431 | |
432 | #ifdef SOLVER_DIAGNOSTICS |
433 | { |
434 | char *t = board_text_format(w, h, board); |
435 | for (i = 0; i < h; i++) { |
436 | for (j = 0; j < w; j++) { |
437 | int c = board[i*w+j]; |
438 | if (ISDIST(c)) |
439 | printf("D%-3d", c); |
440 | else if (c == MAINANCHOR) |
441 | printf("M "); |
442 | else if (c == ANCHOR) |
443 | printf("A "); |
444 | else if (c == WALL) |
445 | printf("W "); |
446 | else if (c == EMPTY) |
447 | printf("E "); |
448 | } |
449 | printf("\n"); |
450 | } |
451 | |
452 | printf("Starting solver for:\n%s\n", t); |
453 | sfree(t); |
454 | } |
455 | #endif |
456 | |
457 | sorted = newtree234(boardcmp); |
458 | queue = newtree234(NULL); |
459 | |
460 | b = newboard(w, h, board); |
461 | b->dist = 0; |
462 | add234(sorted, b); |
463 | addpos234(queue, b, 0); |
464 | qlen = 1; |
465 | |
466 | next = snewn(wh, int); |
467 | anchors = snewn(wh, int); |
468 | which = snewn(wh, int); |
469 | movereached = snewn(wh, int); |
470 | movequeue = snewn(wh, int); |
471 | lastdist = -1; |
472 | |
473 | while ((b = delpos234(queue, 0)) != NULL) { |
474 | qlen--; |
b83e4849 |
475 | if (movelimit >= 0 && b->dist >= movelimit) { |
476 | /* |
477 | * The problem is not soluble in under `movelimit' |
478 | * moves, so we can quit right now. |
479 | */ |
480 | b2 = NULL; |
481 | goto done; |
482 | } |
ac511ec9 |
483 | if (b->dist != lastdist) { |
484 | #ifdef SOLVER_DIAGNOSTICS |
485 | printf("dist %d (%d)\n", b->dist, count234(sorted)); |
486 | #endif |
487 | lastdist = b->dist; |
488 | } |
489 | /* |
490 | * Find all the anchors and form a linked list of the |
491 | * squares within each block. |
492 | */ |
493 | for (i = 0; i < wh; i++) { |
494 | next[i] = -1; |
495 | anchors[i] = FALSE; |
496 | which[i] = -1; |
497 | if (ISANCHOR(b->data[i])) { |
498 | anchors[i] = TRUE; |
499 | which[i] = i; |
500 | } else if (ISDIST(b->data[i])) { |
501 | j = i - b->data[i]; |
502 | next[j] = i; |
503 | which[i] = which[j]; |
504 | } |
505 | } |
506 | |
507 | /* |
508 | * For each anchor, do an array-based BFS to find all the |
509 | * places we can slide it to. |
510 | */ |
511 | for (i = 0; i < wh; i++) { |
512 | if (!anchors[i]) |
513 | continue; |
514 | |
515 | mqhead = mqtail = 0; |
516 | for (j = 0; j < wh; j++) |
517 | movereached[j] = FALSE; |
518 | movequeue[mqtail++] = i; |
519 | while (mqhead < mqtail) { |
520 | int pos = movequeue[mqhead++]; |
521 | |
522 | /* |
523 | * Try to move in each direction from here. |
524 | */ |
525 | for (dir = 0; dir < 4; dir++) { |
526 | int dx = (dir == 0 ? -1 : dir == 1 ? +1 : 0); |
527 | int dy = (dir == 2 ? -1 : dir == 3 ? +1 : 0); |
528 | int offset = dy*w + dx; |
529 | int newpos = pos + offset; |
530 | int d = newpos - i; |
531 | |
532 | /* |
533 | * For each square involved in this block, |
534 | * check to see if the square d spaces away |
535 | * from it is either empty or part of the same |
536 | * block. |
537 | */ |
538 | for (j = i; j >= 0; j = next[j]) { |
539 | int jy = (pos+j-i) / w + dy, jx = (pos+j-i) % w + dx; |
540 | if (jy >= 0 && jy < h && jx >= 0 && jx < w && |
541 | ((b->data[j+d] == EMPTY || which[j+d] == i) && |
542 | (b->data[i] == MAINANCHOR || !forcefield[j+d]))) |
543 | /* ok */; |
544 | else |
545 | break; |
546 | } |
547 | if (j >= 0) |
548 | continue; /* this direction wasn't feasible */ |
549 | |
550 | /* |
551 | * If we've already tried moving this piece |
552 | * here, leave it. |
553 | */ |
554 | if (movereached[newpos]) |
555 | continue; |
556 | movereached[newpos] = TRUE; |
557 | movequeue[mqtail++] = newpos; |
558 | |
559 | /* |
560 | * We have a viable move. Make it. |
561 | */ |
562 | b2 = newboard(w, h, b->data); |
563 | for (j = i; j >= 0; j = next[j]) |
564 | b2->data[j] = EMPTY; |
565 | for (j = i; j >= 0; j = next[j]) |
566 | b2->data[j+d] = b->data[j]; |
567 | |
568 | b3 = add234(sorted, b2); |
569 | if (b3 != b2) { |
570 | sfree(b2); /* we already got one */ |
571 | } else { |
572 | b2->dist = b->dist + 1; |
573 | b2->prev = b; |
574 | addpos234(queue, b2, qlen++); |
575 | if (b2->data[ty*w+tx] == MAINANCHOR) |
576 | goto done; /* search completed! */ |
577 | } |
578 | } |
579 | } |
580 | } |
581 | } |
582 | b2 = NULL; |
583 | |
584 | done: |
585 | |
b48c4c04 |
586 | if (b2) { |
ac511ec9 |
587 | ret = b2->dist; |
b48c4c04 |
588 | if (moveout) { |
589 | /* |
590 | * Now b2 represents the solved position. Backtrack to |
591 | * output the solution. |
592 | */ |
593 | *moveout = snewn(ret * 2, int); |
594 | j = ret * 2; |
595 | |
596 | while (b2->prev) { |
597 | int from = -1, to = -1; |
598 | |
599 | b = b2->prev; |
600 | |
601 | /* |
602 | * Scan b and b2 to find out which piece has |
603 | * moved. |
604 | */ |
605 | for (i = 0; i < wh; i++) { |
606 | if (ISANCHOR(b->data[i]) && !ISANCHOR(b2->data[i])) { |
607 | assert(from == -1); |
608 | from = i; |
609 | } else if (!ISANCHOR(b->data[i]) && ISANCHOR(b2->data[i])){ |
610 | assert(to == -1); |
611 | to = i; |
612 | } |
613 | } |
614 | |
615 | assert(from >= 0 && to >= 0); |
616 | assert(j >= 2); |
617 | (*moveout)[--j] = to; |
618 | (*moveout)[--j] = from; |
619 | |
620 | b2 = b; |
621 | } |
622 | assert(j == 0); |
623 | } |
624 | } else { |
ac511ec9 |
625 | ret = -1; /* no solution */ |
b48c4c04 |
626 | if (moveout) |
627 | *moveout = NULL; |
628 | } |
ac511ec9 |
629 | |
630 | freetree234(queue); |
631 | |
632 | while ((b = delpos234(sorted, 0)) != NULL) |
633 | sfree(b); |
634 | freetree234(sorted); |
635 | |
636 | sfree(next); |
637 | sfree(anchors); |
638 | sfree(movereached); |
639 | sfree(movequeue); |
640 | sfree(which); |
641 | |
642 | return ret; |
643 | } |
644 | |
645 | /* ---------------------------------------------------------------------- |
646 | * Random board generation. |
647 | */ |
648 | |
649 | static void generate_board(int w, int h, int *rtx, int *rty, int *minmoves, |
650 | random_state *rs, unsigned char **rboard, |
b83e4849 |
651 | unsigned char **rforcefield, int movelimit) |
ac511ec9 |
652 | { |
653 | int wh = w*h; |
654 | unsigned char *board, *board2, *forcefield; |
39bdcaad |
655 | unsigned char *tried_merge; |
656 | int *dsf; |
ac511ec9 |
657 | int *list, nlist, pos; |
658 | int tx, ty; |
659 | int i, j; |
660 | int moves; |
661 | |
662 | /* |
663 | * Set up a board and fill it with singletons, except for a |
664 | * border of walls. |
665 | */ |
666 | board = snewn(wh, unsigned char); |
667 | forcefield = snewn(wh, unsigned char); |
668 | board2 = snewn(wh, unsigned char); |
669 | memset(board, ANCHOR, wh); |
670 | memset(forcefield, FALSE, wh); |
671 | for (i = 0; i < w; i++) |
672 | board[i] = board[i+w*(h-1)] = WALL; |
673 | for (i = 0; i < h; i++) |
674 | board[i*w] = board[i*w+(w-1)] = WALL; |
675 | |
39bdcaad |
676 | tried_merge = snewn(wh * wh, unsigned char); |
677 | memset(tried_merge, 0, wh*wh); |
678 | dsf = snew_dsf(wh); |
679 | |
ac511ec9 |
680 | /* |
681 | * Invent a main piece at one extreme. (FIXME: vary the |
682 | * extreme, and the piece.) |
683 | */ |
684 | board[w+1] = MAINANCHOR; |
685 | board[w+2] = DIST(1); |
686 | board[w*2+1] = DIST(w-1); |
687 | board[w*2+2] = DIST(1); |
688 | |
689 | /* |
690 | * Invent a target position. (FIXME: vary this too.) |
691 | */ |
692 | tx = w-2; |
693 | ty = h-3; |
694 | forcefield[ty*w+tx+1] = forcefield[(ty+1)*w+tx+1] = TRUE; |
695 | board[ty*w+tx+1] = board[(ty+1)*w+tx+1] = EMPTY; |
696 | |
697 | /* |
698 | * Gradually remove singletons until the game becomes soluble. |
699 | */ |
700 | for (j = w; j-- > 0 ;) |
701 | for (i = h; i-- > 0 ;) |
702 | if (board[i*w+j] == ANCHOR) { |
703 | /* |
704 | * See if the board is already soluble. |
705 | */ |
706 | if ((moves = solve_board(w, h, board, forcefield, |
b48c4c04 |
707 | tx, ty, movelimit, NULL)) >= 0) |
ac511ec9 |
708 | goto soluble; |
709 | |
710 | /* |
711 | * Otherwise, remove this piece. |
712 | */ |
713 | board[i*w+j] = EMPTY; |
714 | } |
715 | assert(!"We shouldn't get here"); |
716 | soluble: |
717 | |
718 | /* |
719 | * Make a list of all the inter-block edges on the board. |
720 | */ |
721 | list = snewn(wh*2, int); |
722 | nlist = 0; |
723 | for (i = 0; i+1 < w; i++) |
724 | for (j = 0; j < h; j++) |
725 | list[nlist++] = (j*w+i) * 2 + 0; /* edge to the right of j*w+i */ |
726 | for (j = 0; j+1 < h; j++) |
727 | for (i = 0; i < w; i++) |
728 | list[nlist++] = (j*w+i) * 2 + 1; /* edge below j*w+i */ |
729 | |
730 | /* |
731 | * Now go through that list in random order, trying to merge |
732 | * the blocks on each side of each edge. |
ac511ec9 |
733 | */ |
734 | shuffle(list, nlist, sizeof(*list), rs); |
735 | while (nlist > 0) { |
39bdcaad |
736 | int x1, y1, p1, c1; |
737 | int x2, y2, p2, c2; |
ac511ec9 |
738 | |
739 | pos = list[--nlist]; |
740 | y1 = y2 = pos / (w*2); |
741 | x1 = x2 = (pos / 2) % w; |
742 | if (pos % 2) |
743 | y2++; |
744 | else |
745 | x2++; |
746 | p1 = y1*w+x1; |
747 | p2 = y2*w+x2; |
748 | |
749 | /* |
39bdcaad |
750 | * Immediately abandon the attempt if we've already tried |
751 | * to merge the same pair of blocks along a different |
752 | * edge. |
753 | */ |
754 | c1 = dsf_canonify(dsf, p1); |
755 | c2 = dsf_canonify(dsf, p2); |
756 | if (tried_merge[c1 * wh + c2]) |
39bdcaad |
757 | continue; |
39bdcaad |
758 | |
759 | /* |
ac511ec9 |
760 | * In order to be mergeable, these two squares must each |
761 | * either be, or belong to, a non-main anchor, and their |
762 | * anchors must also be distinct. |
763 | */ |
764 | if (!ISBLOCK(board[p1]) || !ISBLOCK(board[p2])) |
765 | continue; |
766 | while (ISDIST(board[p1])) |
767 | p1 -= board[p1]; |
768 | while (ISDIST(board[p2])) |
769 | p2 -= board[p2]; |
770 | if (board[p1] == MAINANCHOR || board[p2] == MAINANCHOR || p1 == p2) |
771 | continue; |
772 | |
773 | /* |
774 | * We can merge these blocks. Try it, and see if the |
775 | * puzzle remains soluble. |
776 | */ |
777 | memcpy(board2, board, wh); |
778 | j = -1; |
779 | while (p1 < wh || p2 < wh) { |
780 | /* |
781 | * p1 and p2 are the squares at the head of each block |
782 | * list. Pick the smaller one and put it on the output |
783 | * block list. |
784 | */ |
785 | i = min(p1, p2); |
786 | if (j < 0) { |
787 | board[i] = ANCHOR; |
788 | } else { |
789 | assert(i - j <= MAXDIST); |
790 | board[i] = DIST(i - j); |
791 | } |
792 | j = i; |
793 | |
794 | /* |
795 | * Now advance whichever list that came from. |
796 | */ |
797 | if (i == p1) { |
798 | do { |
799 | p1++; |
800 | } while (p1 < wh && board[p1] != DIST(p1-i)); |
801 | } else { |
802 | do { |
803 | p2++; |
804 | } while (p2 < wh && board[p2] != DIST(p2-i)); |
805 | } |
806 | } |
b48c4c04 |
807 | j = solve_board(w, h, board, forcefield, tx, ty, movelimit, NULL); |
ac511ec9 |
808 | if (j < 0) { |
809 | /* |
810 | * Didn't work. Revert the merge. |
811 | */ |
812 | memcpy(board, board2, wh); |
39bdcaad |
813 | tried_merge[c1 * wh + c2] = tried_merge[c2 * wh + c1] = TRUE; |
ac511ec9 |
814 | } else { |
39bdcaad |
815 | int c; |
816 | |
ac511ec9 |
817 | moves = j; |
39bdcaad |
818 | |
819 | dsf_merge(dsf, c1, c2); |
820 | c = dsf_canonify(dsf, c1); |
821 | for (i = 0; i < wh; i++) |
822 | tried_merge[c*wh+i] = (tried_merge[c1*wh+i] | |
823 | tried_merge[c2*wh+i]); |
824 | for (i = 0; i < wh; i++) |
825 | tried_merge[i*wh+c] = (tried_merge[i*wh+c1] | |
826 | tried_merge[i*wh+c2]); |
ac511ec9 |
827 | } |
828 | } |
829 | |
830 | sfree(board2); |
831 | |
832 | *rtx = tx; |
833 | *rty = ty; |
834 | *rboard = board; |
835 | *rforcefield = forcefield; |
836 | *minmoves = moves; |
837 | } |
838 | |
839 | /* ---------------------------------------------------------------------- |
840 | * End of solver/generator code. |
841 | */ |
842 | |
843 | static char *new_game_desc(game_params *params, random_state *rs, |
844 | char **aux, int interactive) |
845 | { |
846 | int w = params->w, h = params->h, wh = w*h; |
847 | int tx, ty, minmoves; |
848 | unsigned char *board, *forcefield; |
849 | char *ret, *p; |
850 | int i; |
851 | |
852 | generate_board(params->w, params->h, &tx, &ty, &minmoves, rs, |
b83e4849 |
853 | &board, &forcefield, params->maxmoves); |
ac511ec9 |
854 | #ifdef GENERATOR_DIAGNOSTICS |
855 | { |
856 | char *t = board_text_format(params->w, params->h, board); |
857 | printf("%s\n", t); |
858 | sfree(t); |
859 | } |
860 | #endif |
861 | |
862 | /* |
863 | * Encode as a game ID. |
864 | */ |
865 | ret = snewn(wh * 6 + 40, char); |
866 | p = ret; |
867 | i = 0; |
868 | while (i < wh) { |
869 | if (ISDIST(board[i])) { |
870 | p += sprintf(p, "d%d", board[i]); |
871 | i++; |
872 | } else { |
873 | int count = 1; |
874 | int b = board[i], f = forcefield[i]; |
875 | int c = (b == ANCHOR ? 'a' : |
876 | b == MAINANCHOR ? 'm' : |
877 | b == EMPTY ? 'e' : |
878 | /* b == WALL ? */ 'w'); |
879 | if (f) *p++ = 'f'; |
880 | *p++ = c; |
881 | i++; |
882 | while (i < wh && board[i] == b && forcefield[i] == f) |
883 | i++, count++; |
884 | if (count > 1) |
885 | p += sprintf(p, "%d", count); |
886 | } |
887 | } |
888 | p += sprintf(p, ",%d,%d,%d", tx, ty, minmoves); |
889 | ret = sresize(ret, p+1 - ret, char); |
890 | |
ac511ec9 |
891 | sfree(board); |
892 | sfree(forcefield); |
893 | |
894 | return ret; |
895 | } |
896 | |
897 | static char *validate_desc(game_params *params, char *desc) |
898 | { |
899 | int w = params->w, h = params->h, wh = w*h; |
900 | int *active, *link; |
901 | int mains = 0, mpos = -1; |
6ce42e60 |
902 | int i, tx, ty, minmoves; |
ac511ec9 |
903 | char *ret; |
904 | |
905 | active = snewn(wh, int); |
906 | link = snewn(wh, int); |
907 | i = 0; |
908 | |
909 | while (*desc && *desc != ',') { |
910 | if (i >= wh) { |
911 | ret = "Too much data in game description"; |
912 | goto done; |
913 | } |
914 | link[i] = -1; |
915 | active[i] = FALSE; |
916 | if (*desc == 'f' || *desc == 'F') { |
917 | desc++; |
918 | if (!*desc) { |
919 | ret = "Expected another character after 'f' in game " |
920 | "description"; |
921 | goto done; |
922 | } |
923 | } |
924 | |
925 | if (*desc == 'd' || *desc == 'D') { |
926 | int dist; |
927 | |
928 | desc++; |
929 | if (!isdigit((unsigned char)*desc)) { |
930 | ret = "Expected a number after 'd' in game description"; |
931 | goto done; |
932 | } |
933 | dist = atoi(desc); |
934 | while (*desc && isdigit((unsigned char)*desc)) desc++; |
935 | |
936 | if (dist <= 0 || dist > i) { |
937 | ret = "Out-of-range number after 'd' in game description"; |
938 | goto done; |
939 | } |
940 | |
941 | if (!active[i - dist]) { |
942 | ret = "Invalid back-reference in game description"; |
943 | goto done; |
944 | } |
945 | |
946 | link[i] = i - dist; |
ac511ec9 |
947 | |
948 | active[i] = TRUE; |
949 | active[link[i]] = FALSE; |
950 | i++; |
951 | } else { |
952 | int c = *desc++; |
953 | int count = 1; |
954 | |
955 | if (!strchr("aAmMeEwW", c)) { |
956 | ret = "Invalid character in game description"; |
957 | goto done; |
958 | } |
959 | if (isdigit((unsigned char)*desc)) { |
960 | count = atoi(desc); |
961 | while (*desc && isdigit((unsigned char)*desc)) desc++; |
962 | } |
963 | if (i + count > wh) { |
964 | ret = "Too much data in game description"; |
965 | goto done; |
966 | } |
967 | while (count-- > 0) { |
968 | active[i] = (strchr("aAmM", c) != NULL); |
969 | link[i] = -1; |
970 | if (strchr("mM", c) != NULL) { |
971 | mains++; |
972 | mpos = i; |
973 | } |
974 | i++; |
975 | } |
976 | } |
977 | } |
978 | if (mains != 1) { |
979 | ret = (mains == 0 ? "No main piece specified in game description" : |
980 | "More than one main piece specified in game description"); |
981 | goto done; |
982 | } |
983 | if (i < wh) { |
984 | ret = "Not enough data in game description"; |
985 | goto done; |
986 | } |
987 | |
988 | /* |
989 | * Now read the target coordinates. |
990 | */ |
991 | i = sscanf(desc, ",%d,%d,%d", &tx, &ty, &minmoves); |
992 | if (i < 2) { |
993 | ret = "No target coordinates specified"; |
994 | goto done; |
995 | /* |
996 | * (but minmoves is optional) |
997 | */ |
998 | } |
999 | |
1000 | ret = NULL; |
1001 | |
1002 | done: |
1003 | sfree(active); |
1004 | sfree(link); |
1005 | return ret; |
1006 | } |
1007 | |
1008 | static game_state *new_game(midend *me, game_params *params, char *desc) |
1009 | { |
1010 | int w = params->w, h = params->h, wh = w*h; |
1011 | game_state *state; |
1012 | int i; |
1013 | |
1014 | state = snew(game_state); |
1015 | state->w = w; |
1016 | state->h = h; |
1017 | state->board = snewn(wh, unsigned char); |
1018 | state->lastmoved = state->lastmoved_pos = -1; |
1019 | state->movecount = 0; |
1020 | state->imm = snew(struct game_immutable_state); |
1021 | state->imm->refcount = 1; |
1022 | state->imm->forcefield = snewn(wh, unsigned char); |
1023 | |
1024 | i = 0; |
1025 | |
1026 | while (*desc && *desc != ',') { |
1027 | int f = FALSE; |
1028 | |
1029 | assert(i < wh); |
1030 | |
1031 | if (*desc == 'f') { |
1032 | f = TRUE; |
1033 | desc++; |
1034 | assert(*desc); |
1035 | } |
1036 | |
1037 | if (*desc == 'd' || *desc == 'D') { |
1038 | int dist; |
1039 | |
1040 | desc++; |
1041 | dist = atoi(desc); |
1042 | while (*desc && isdigit((unsigned char)*desc)) desc++; |
1043 | |
1044 | state->board[i] = DIST(dist); |
1045 | state->imm->forcefield[i] = f; |
1046 | |
1047 | i++; |
1048 | } else { |
1049 | int c = *desc++; |
1050 | int count = 1; |
1051 | |
1052 | if (isdigit((unsigned char)*desc)) { |
1053 | count = atoi(desc); |
1054 | while (*desc && isdigit((unsigned char)*desc)) desc++; |
1055 | } |
1056 | assert(i + count <= wh); |
1057 | |
1058 | c = (c == 'a' || c == 'A' ? ANCHOR : |
1059 | c == 'm' || c == 'M' ? MAINANCHOR : |
1060 | c == 'e' || c == 'E' ? EMPTY : |
1061 | /* c == 'w' || c == 'W' ? */ WALL); |
1062 | |
1063 | while (count-- > 0) { |
1064 | state->board[i] = c; |
1065 | state->imm->forcefield[i] = f; |
1066 | i++; |
1067 | } |
1068 | } |
1069 | } |
1070 | |
1071 | /* |
1072 | * Now read the target coordinates. |
1073 | */ |
1074 | state->tx = state->ty = 0; |
1075 | state->minmoves = -1; |
1076 | i = sscanf(desc, ",%d,%d,%d", &state->tx, &state->ty, &state->minmoves); |
1077 | |
1078 | if (state->board[state->ty*w+state->tx] == MAINANCHOR) |
1079 | state->completed = 0; /* already complete! */ |
1080 | else |
1081 | state->completed = -1; |
1082 | |
a60aa018 |
1083 | state->cheated = FALSE; |
1084 | state->soln = NULL; |
1085 | state->soln_index = -1; |
1086 | |
ac511ec9 |
1087 | return state; |
1088 | } |
1089 | |
1090 | static game_state *dup_game(game_state *state) |
1091 | { |
1092 | int w = state->w, h = state->h, wh = w*h; |
1093 | game_state *ret = snew(game_state); |
1094 | |
1095 | ret->w = state->w; |
1096 | ret->h = state->h; |
1097 | ret->board = snewn(wh, unsigned char); |
1098 | memcpy(ret->board, state->board, wh); |
1099 | ret->tx = state->tx; |
1100 | ret->ty = state->ty; |
1101 | ret->minmoves = state->minmoves; |
1102 | ret->lastmoved = state->lastmoved; |
1103 | ret->lastmoved_pos = state->lastmoved_pos; |
1104 | ret->movecount = state->movecount; |
1105 | ret->completed = state->completed; |
a60aa018 |
1106 | ret->cheated = state->cheated; |
ac511ec9 |
1107 | ret->imm = state->imm; |
1108 | ret->imm->refcount++; |
a60aa018 |
1109 | ret->soln = state->soln; |
1110 | ret->soln_index = state->soln_index; |
1111 | if (ret->soln) |
1112 | ret->soln->refcount++; |
ac511ec9 |
1113 | |
1114 | return ret; |
1115 | } |
1116 | |
1117 | static void free_game(game_state *state) |
1118 | { |
1119 | if (--state->imm->refcount <= 0) { |
1120 | sfree(state->imm->forcefield); |
1121 | sfree(state->imm); |
1122 | } |
a60aa018 |
1123 | if (state->soln && --state->soln->refcount <= 0) { |
1124 | sfree(state->soln->moves); |
1125 | sfree(state->soln); |
1126 | } |
ac511ec9 |
1127 | sfree(state->board); |
1128 | sfree(state); |
1129 | } |
1130 | |
1131 | static char *solve_game(game_state *state, game_state *currstate, |
1132 | char *aux, char **error) |
1133 | { |
a60aa018 |
1134 | int *moves; |
1135 | int nmoves; |
1136 | int i; |
1137 | char *ret, *p, sep; |
1138 | |
ac511ec9 |
1139 | /* |
a60aa018 |
1140 | * Run the solver and attempt to find the shortest solution |
1141 | * from the current position. |
ac511ec9 |
1142 | */ |
a60aa018 |
1143 | nmoves = solve_board(state->w, state->h, state->board, |
1144 | state->imm->forcefield, state->tx, state->ty, |
1145 | -1, &moves); |
1146 | |
1147 | if (nmoves < 0) { |
1148 | *error = "Unable to find a solution to this puzzle"; |
1149 | return NULL; |
1150 | } |
1151 | if (nmoves == 0) { |
1152 | *error = "Puzzle is already solved"; |
1153 | return NULL; |
1154 | } |
1155 | |
1156 | /* |
1157 | * Encode the resulting solution as a move string. |
1158 | */ |
1159 | ret = snewn(nmoves * 40, char); |
1160 | p = ret; |
1161 | sep = 'S'; |
1162 | |
1163 | for (i = 0; i < nmoves; i++) { |
1164 | p += sprintf(p, "%c%d-%d", sep, moves[i*2], moves[i*2+1]); |
1165 | sep = ','; |
1166 | } |
1167 | |
1168 | sfree(moves); |
1169 | assert(p - ret < nmoves * 40); |
1170 | ret = sresize(ret, p+1 - ret, char); |
1171 | |
1172 | return ret; |
ac511ec9 |
1173 | } |
1174 | |
1175 | static char *game_text_format(game_state *state) |
1176 | { |
1177 | return board_text_format(state->w, state->h, state->board, |
1178 | state->imm->forcefield); |
1179 | } |
1180 | |
1181 | struct game_ui { |
1182 | int dragging; |
1183 | int drag_anchor; |
1184 | int drag_offset_x, drag_offset_y; |
1185 | int drag_currpos; |
1186 | unsigned char *reachable; |
1187 | int *bfs_queue; /* used as scratch in interpret_move */ |
1188 | }; |
1189 | |
1190 | static game_ui *new_ui(game_state *state) |
1191 | { |
1192 | int w = state->w, h = state->h, wh = w*h; |
1193 | game_ui *ui = snew(game_ui); |
1194 | |
1195 | ui->dragging = FALSE; |
1196 | ui->drag_anchor = ui->drag_currpos = -1; |
1197 | ui->drag_offset_x = ui->drag_offset_y = -1; |
1198 | ui->reachable = snewn(wh, unsigned char); |
1199 | memset(ui->reachable, 0, wh); |
1200 | ui->bfs_queue = snewn(wh, int); |
1201 | |
1202 | return ui; |
1203 | } |
1204 | |
1205 | static void free_ui(game_ui *ui) |
1206 | { |
1207 | sfree(ui->bfs_queue); |
1208 | sfree(ui->reachable); |
1209 | sfree(ui); |
1210 | } |
1211 | |
1212 | static char *encode_ui(game_ui *ui) |
1213 | { |
1214 | return NULL; |
1215 | } |
1216 | |
1217 | static void decode_ui(game_ui *ui, char *encoding) |
1218 | { |
1219 | } |
1220 | |
1221 | static void game_changed_state(game_ui *ui, game_state *oldstate, |
1222 | game_state *newstate) |
1223 | { |
1224 | } |
1225 | |
1226 | #define PREFERRED_TILESIZE 32 |
1227 | #define TILESIZE (ds->tilesize) |
1228 | #define BORDER (TILESIZE/2) |
1229 | #define COORD(x) ( (x) * TILESIZE + BORDER ) |
1230 | #define FROMCOORD(x) ( ((x) - BORDER + TILESIZE) / TILESIZE - 1 ) |
1231 | #define BORDER_WIDTH (1 + TILESIZE/20) |
1232 | #define HIGHLIGHT_WIDTH (1 + TILESIZE/16) |
1233 | |
1234 | #define FLASH_INTERVAL 0.10F |
1235 | #define FLASH_TIME 3*FLASH_INTERVAL |
1236 | |
1237 | struct game_drawstate { |
1238 | int tilesize; |
1239 | int w, h; |
1240 | unsigned long *grid; /* what's currently displayed */ |
1241 | int started; |
1242 | }; |
1243 | |
1244 | static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds, |
1245 | int x, int y, int button) |
1246 | { |
1247 | int w = state->w, h = state->h, wh = w*h; |
1248 | int tx, ty, i, j; |
1249 | int qhead, qtail; |
1250 | |
1251 | if (button == LEFT_BUTTON) { |
1252 | tx = FROMCOORD(x); |
1253 | ty = FROMCOORD(y); |
1254 | |
1255 | if (tx < 0 || tx >= w || ty < 0 || ty >= h || |
1256 | !ISBLOCK(state->board[ty*w+tx])) |
1257 | return NULL; /* this click has no effect */ |
1258 | |
1259 | /* |
1260 | * User has clicked on a block. Find the block's anchor |
1261 | * and register that we've started dragging it. |
1262 | */ |
1263 | i = ty*w+tx; |
1264 | while (ISDIST(state->board[i])) |
1265 | i -= state->board[i]; |
1266 | assert(i >= 0 && i < wh); |
1267 | |
1268 | ui->dragging = TRUE; |
1269 | ui->drag_anchor = i; |
1270 | ui->drag_offset_x = tx - (i % w); |
1271 | ui->drag_offset_y = ty - (i / w); |
1272 | ui->drag_currpos = i; |
1273 | |
1274 | /* |
1275 | * Now we immediately bfs out from the current location of |
1276 | * the anchor, to find all the places to which this block |
1277 | * can be dragged. |
1278 | */ |
1279 | memset(ui->reachable, FALSE, wh); |
1280 | qhead = qtail = 0; |
1281 | ui->reachable[i] = TRUE; |
1282 | ui->bfs_queue[qtail++] = i; |
1283 | for (j = i; j < wh; j++) |
1284 | if (state->board[j] == DIST(j - i)) |
1285 | i = j; |
1286 | while (qhead < qtail) { |
1287 | int pos = ui->bfs_queue[qhead++]; |
1288 | int x = pos % w, y = pos / w; |
1289 | int dir; |
1290 | |
1291 | for (dir = 0; dir < 4; dir++) { |
1292 | int dx = (dir == 0 ? -1 : dir == 1 ? +1 : 0); |
1293 | int dy = (dir == 2 ? -1 : dir == 3 ? +1 : 0); |
1294 | int newpos; |
1295 | |
1296 | if (x + dx < 0 || x + dx >= w || |
1297 | y + dy < 0 || y + dy >= h) |
1298 | continue; |
1299 | |
1300 | newpos = pos + dy*w + dx; |
1301 | if (ui->reachable[newpos]) |
1302 | continue; /* already done this one */ |
1303 | |
1304 | /* |
1305 | * Now search the grid to see if the block we're |
1306 | * dragging could fit into this space. |
1307 | */ |
1308 | for (j = i; j >= 0; j = (ISDIST(state->board[j]) ? |
1309 | j - state->board[j] : -1)) { |
1310 | int jx = (j+pos-ui->drag_anchor) % w; |
1311 | int jy = (j+pos-ui->drag_anchor) / w; |
1312 | int j2; |
1313 | |
1314 | if (jx + dx < 0 || jx + dx >= w || |
1315 | jy + dy < 0 || jy + dy >= h) |
1316 | break; /* this position isn't valid at all */ |
1317 | |
1318 | j2 = (j+pos-ui->drag_anchor) + dy*w + dx; |
1319 | |
1320 | if (state->board[j2] == EMPTY && |
1321 | (!state->imm->forcefield[j2] || |
1322 | state->board[ui->drag_anchor] == MAINANCHOR)) |
1323 | continue; |
1324 | while (ISDIST(state->board[j2])) |
1325 | j2 -= state->board[j2]; |
1326 | assert(j2 >= 0 && j2 < wh); |
1327 | if (j2 == ui->drag_anchor) |
1328 | continue; |
1329 | else |
1330 | break; |
1331 | } |
1332 | |
1333 | if (j < 0) { |
1334 | /* |
1335 | * If we got to the end of that loop without |
1336 | * disqualifying this position, mark it as |
1337 | * reachable for this drag. |
1338 | */ |
1339 | ui->reachable[newpos] = TRUE; |
1340 | ui->bfs_queue[qtail++] = newpos; |
1341 | } |
1342 | } |
1343 | } |
1344 | |
1345 | /* |
1346 | * And that's it. Update the display to reflect the start |
1347 | * of a drag. |
1348 | */ |
1349 | return ""; |
1350 | } else if (button == LEFT_DRAG && ui->dragging) { |
1351 | tx = FROMCOORD(x); |
1352 | ty = FROMCOORD(y); |
1353 | |
1354 | tx -= ui->drag_offset_x; |
1355 | ty -= ui->drag_offset_y; |
1356 | if (tx < 0 || tx >= w || ty < 0 || ty >= h || |
1357 | !ui->reachable[ty*w+tx]) |
1358 | return NULL; /* this drag has no effect */ |
1359 | |
1360 | ui->drag_currpos = ty*w+tx; |
1361 | return ""; |
1362 | } else if (button == LEFT_RELEASE && ui->dragging) { |
1363 | char data[256], *str; |
1364 | |
1365 | /* |
1366 | * Terminate the drag, and if the piece has actually moved |
1367 | * then return a move string quoting the old and new |
1368 | * locations of the piece's anchor. |
1369 | */ |
1370 | if (ui->drag_anchor != ui->drag_currpos) { |
1371 | sprintf(data, "M%d-%d", ui->drag_anchor, ui->drag_currpos); |
1372 | str = dupstr(data); |
1373 | } else |
1374 | str = ""; /* null move; just update the UI */ |
1375 | |
1376 | ui->dragging = FALSE; |
1377 | ui->drag_anchor = ui->drag_currpos = -1; |
1378 | ui->drag_offset_x = ui->drag_offset_y = -1; |
1379 | memset(ui->reachable, 0, wh); |
1380 | |
1381 | return str; |
a60aa018 |
1382 | } else if (button == ' ' && state->soln) { |
1383 | /* |
1384 | * Make the next move in the stored solution. |
1385 | */ |
1386 | char data[256]; |
1387 | int a1, a2; |
1388 | |
1389 | a1 = state->soln->moves[state->soln_index*2]; |
1390 | a2 = state->soln->moves[state->soln_index*2+1]; |
1391 | if (a1 == state->lastmoved_pos) |
1392 | a1 = state->lastmoved; |
1393 | |
1394 | sprintf(data, "M%d-%d", a1, a2); |
1395 | return dupstr(data); |
ac511ec9 |
1396 | } |
1397 | |
1398 | return NULL; |
1399 | } |
1400 | |
1401 | static int move_piece(int w, int h, const unsigned char *src, |
1402 | unsigned char *dst, unsigned char *ff, int from, int to) |
1403 | { |
1404 | int wh = w*h; |
1405 | int i, j; |
1406 | |
1407 | if (!ISANCHOR(dst[from])) |
1408 | return FALSE; |
1409 | |
1410 | /* |
1411 | * Scan to the far end of the piece's linked list. |
1412 | */ |
1413 | for (i = j = from; j < wh; j++) |
1414 | if (src[j] == DIST(j - i)) |
1415 | i = j; |
1416 | |
1417 | /* |
1418 | * Remove the piece from its old location in the new |
1419 | * game state. |
1420 | */ |
1421 | for (j = i; j >= 0; j = (ISDIST(src[j]) ? j - src[j] : -1)) |
1422 | dst[j] = EMPTY; |
1423 | |
1424 | /* |
1425 | * And put it back in at the new location. |
1426 | */ |
1427 | for (j = i; j >= 0; j = (ISDIST(src[j]) ? j - src[j] : -1)) { |
1428 | int jn = j + to - from; |
1429 | if (jn < 0 || jn >= wh) |
1430 | return FALSE; |
1431 | if (dst[jn] == EMPTY && (!ff[jn] || src[from] == MAINANCHOR)) { |
1432 | dst[jn] = src[j]; |
1433 | } else { |
1434 | return FALSE; |
1435 | } |
1436 | } |
1437 | |
1438 | return TRUE; |
1439 | } |
1440 | |
1441 | static game_state *execute_move(game_state *state, char *move) |
1442 | { |
1443 | int w = state->w, h = state->h /* , wh = w*h */; |
1444 | char c; |
a60aa018 |
1445 | int a1, a2, n, movesize; |
ac511ec9 |
1446 | game_state *ret = dup_game(state); |
1447 | |
1448 | while (*move) { |
1449 | c = *move; |
a60aa018 |
1450 | if (c == 'S') { |
1451 | /* |
1452 | * This is a solve move, so we just set up a stored |
1453 | * solution path. |
1454 | */ |
1455 | if (ret->soln && --ret->soln->refcount <= 0) { |
1456 | sfree(ret->soln->moves); |
1457 | sfree(ret->soln); |
1458 | } |
1459 | ret->soln = snew(struct game_solution); |
1460 | ret->soln->nmoves = 0; |
1461 | ret->soln->moves = NULL; |
1462 | ret->soln->refcount = 1; |
1463 | ret->soln_index = 0; |
1464 | ret->cheated = TRUE; |
1465 | |
1466 | movesize = 0; |
1467 | move++; |
1468 | while (1) { |
1469 | if (sscanf(move, "%d-%d%n", &a1, &a2, &n) != 2) { |
1470 | free_game(ret); |
1471 | return NULL; |
1472 | } |
1473 | |
1474 | /* |
1475 | * Special case: if the first move in the solution |
1476 | * involves the piece for which we already have a |
1477 | * partial stored move, adjust the source point to |
1478 | * the original starting point of that piece. |
1479 | */ |
1480 | if (ret->soln->nmoves == 0 && a1 == ret->lastmoved) |
1481 | a1 = ret->lastmoved_pos; |
1482 | |
1483 | if (ret->soln->nmoves >= movesize) { |
1484 | movesize = (ret->soln->nmoves + 48) * 4 / 3; |
1485 | ret->soln->moves = sresize(ret->soln->moves, |
1486 | 2*movesize, int); |
1487 | } |
1488 | |
1489 | ret->soln->moves[2*ret->soln->nmoves] = a1; |
1490 | ret->soln->moves[2*ret->soln->nmoves+1] = a2; |
1491 | ret->soln->nmoves++; |
1492 | move += n; |
1493 | if (*move != ',') |
1494 | break; |
1495 | move++; /* eat comma */ |
1496 | } |
1497 | } else if (c == 'M') { |
ac511ec9 |
1498 | move++; |
1499 | if (sscanf(move, "%d-%d%n", &a1, &a2, &n) != 2 || |
1500 | !move_piece(w, h, state->board, ret->board, |
1501 | state->imm->forcefield, a1, a2)) { |
1502 | free_game(ret); |
1503 | return NULL; |
1504 | } |
1505 | if (a1 == ret->lastmoved) { |
1506 | /* |
1507 | * If the player has moved the same piece as they |
1508 | * moved last time, don't increment the move |
1509 | * count. In fact, if they've put the piece back |
1510 | * where it started from, _decrement_ the move |
1511 | * count. |
1512 | */ |
1513 | if (a2 == ret->lastmoved_pos) { |
1514 | ret->movecount--; /* reverted last move */ |
1515 | ret->lastmoved = ret->lastmoved_pos = -1; |
1516 | } else { |
1517 | ret->lastmoved = a2; |
1518 | /* don't change lastmoved_pos */ |
1519 | } |
1520 | } else { |
1521 | ret->lastmoved = a2; |
1522 | ret->lastmoved_pos = a1; |
1523 | ret->movecount++; |
1524 | } |
a60aa018 |
1525 | |
1526 | /* |
1527 | * If we have a stored solution path, see if we've |
1528 | * strayed from it or successfully made the next move |
1529 | * along it. |
1530 | */ |
1531 | if (ret->soln && ret->lastmoved_pos >= 0) { |
1532 | if (ret->lastmoved_pos != |
1533 | ret->soln->moves[ret->soln_index*2]) { |
1534 | /* strayed from the path */ |
1535 | ret->soln->refcount--; |
1536 | assert(ret->soln->refcount > 0); |
1537 | /* `state' at least still exists */ |
1538 | ret->soln = NULL; |
1539 | ret->soln_index = -1; |
1540 | } else if (ret->lastmoved == |
1541 | ret->soln->moves[ret->soln_index*2+1]) { |
1542 | /* advanced along the path */ |
1543 | ret->soln_index++; |
1544 | if (ret->soln_index >= ret->soln->nmoves) { |
1545 | /* finished the path! */ |
1546 | ret->soln->refcount--; |
1547 | assert(ret->soln->refcount > 0); |
1548 | /* `state' at least still exists */ |
1549 | ret->soln = NULL; |
1550 | ret->soln_index = -1; |
1551 | } |
1552 | } |
1553 | } |
1554 | |
ac511ec9 |
1555 | if (ret->board[a2] == MAINANCHOR && |
1556 | a2 == ret->ty * w + ret->tx && ret->completed < 0) |
1557 | ret->completed = ret->movecount; |
1558 | move += n; |
1559 | } else { |
1560 | free_game(ret); |
1561 | return NULL; |
1562 | } |
1563 | if (*move == ';') |
1564 | move++; |
1565 | else if (*move) { |
1566 | free_game(ret); |
1567 | return NULL; |
1568 | } |
1569 | } |
1570 | |
1571 | return ret; |
1572 | } |
1573 | |
1574 | /* ---------------------------------------------------------------------- |
1575 | * Drawing routines. |
1576 | */ |
1577 | |
1578 | static void game_compute_size(game_params *params, int tilesize, |
1579 | int *x, int *y) |
1580 | { |
1581 | /* fool the macros */ |
1582 | struct dummy { int tilesize; } dummy = { tilesize }, *ds = &dummy; |
1583 | |
1584 | *x = params->w * TILESIZE + 2*BORDER; |
1585 | *y = params->h * TILESIZE + 2*BORDER; |
1586 | } |
1587 | |
1588 | static void game_set_size(drawing *dr, game_drawstate *ds, |
1589 | game_params *params, int tilesize) |
1590 | { |
1591 | ds->tilesize = tilesize; |
1592 | } |
1593 | |
1594 | static void raise_colour(float *target, float *src, float *limit) |
1595 | { |
1596 | int i; |
1597 | for (i = 0; i < 3; i++) |
1598 | target[i] = (2*src[i] + limit[i]) / 3; |
1599 | } |
1600 | |
1601 | static float *game_colours(frontend *fe, int *ncolours) |
1602 | { |
1603 | float *ret = snewn(3 * NCOLOURS, float); |
1604 | |
1605 | game_mkhighlight(fe, ret, COL_BACKGROUND, COL_HIGHLIGHT, COL_LOWLIGHT); |
1606 | |
1607 | /* |
1608 | * When dragging a tile, we light it up a bit. |
1609 | */ |
1610 | raise_colour(ret+3*COL_DRAGGING, |
1611 | ret+3*COL_BACKGROUND, ret+3*COL_HIGHLIGHT); |
1612 | raise_colour(ret+3*COL_DRAGGING_HIGHLIGHT, |
1613 | ret+3*COL_HIGHLIGHT, ret+3*COL_HIGHLIGHT); |
1614 | raise_colour(ret+3*COL_DRAGGING_LOWLIGHT, |
1615 | ret+3*COL_LOWLIGHT, ret+3*COL_HIGHLIGHT); |
1616 | |
1617 | /* |
1618 | * The main tile is tinted blue. |
1619 | */ |
1620 | ret[COL_MAIN * 3 + 0] = ret[COL_BACKGROUND * 3 + 0]; |
1621 | ret[COL_MAIN * 3 + 1] = ret[COL_BACKGROUND * 3 + 1]; |
1622 | ret[COL_MAIN * 3 + 2] = ret[COL_HIGHLIGHT * 3 + 2]; |
1623 | game_mkhighlight_specific(fe, ret, COL_MAIN, |
1624 | COL_MAIN_HIGHLIGHT, COL_MAIN_LOWLIGHT); |
1625 | |
1626 | /* |
1627 | * And we light that up a bit too when dragging. |
1628 | */ |
1629 | raise_colour(ret+3*COL_MAIN_DRAGGING, |
1630 | ret+3*COL_MAIN, ret+3*COL_MAIN_HIGHLIGHT); |
1631 | raise_colour(ret+3*COL_MAIN_DRAGGING_HIGHLIGHT, |
1632 | ret+3*COL_MAIN_HIGHLIGHT, ret+3*COL_MAIN_HIGHLIGHT); |
1633 | raise_colour(ret+3*COL_MAIN_DRAGGING_LOWLIGHT, |
1634 | ret+3*COL_MAIN_LOWLIGHT, ret+3*COL_MAIN_HIGHLIGHT); |
1635 | |
1636 | /* |
1637 | * The target area on the floor is tinted green. |
1638 | */ |
1639 | ret[COL_TARGET * 3 + 0] = ret[COL_BACKGROUND * 3 + 0]; |
1640 | ret[COL_TARGET * 3 + 1] = ret[COL_HIGHLIGHT * 3 + 1]; |
1641 | ret[COL_TARGET * 3 + 2] = ret[COL_BACKGROUND * 3 + 2]; |
1642 | game_mkhighlight_specific(fe, ret, COL_TARGET, |
1643 | COL_TARGET_HIGHLIGHT, COL_TARGET_LOWLIGHT); |
1644 | |
1645 | *ncolours = NCOLOURS; |
1646 | return ret; |
1647 | } |
1648 | |
1649 | static game_drawstate *game_new_drawstate(drawing *dr, game_state *state) |
1650 | { |
1651 | int w = state->w, h = state->h, wh = w*h; |
1652 | struct game_drawstate *ds = snew(struct game_drawstate); |
1653 | int i; |
1654 | |
1655 | ds->tilesize = 0; |
1656 | ds->w = w; |
1657 | ds->h = h; |
1658 | ds->started = FALSE; |
1659 | ds->grid = snewn(wh, unsigned long); |
1660 | for (i = 0; i < wh; i++) |
1661 | ds->grid[i] = ~(unsigned long)0; |
1662 | |
1663 | return ds; |
1664 | } |
1665 | |
1666 | static void game_free_drawstate(drawing *dr, game_drawstate *ds) |
1667 | { |
1668 | sfree(ds->grid); |
1669 | sfree(ds); |
1670 | } |
1671 | |
1672 | #define BG_NORMAL 0x00000001UL |
1673 | #define BG_TARGET 0x00000002UL |
1674 | #define BG_FORCEFIELD 0x00000004UL |
1675 | #define FLASH_LOW 0x00000008UL |
1676 | #define FLASH_HIGH 0x00000010UL |
1677 | #define FG_WALL 0x00000020UL |
1678 | #define FG_MAIN 0x00000040UL |
1679 | #define FG_NORMAL 0x00000080UL |
1680 | #define FG_DRAGGING 0x00000100UL |
a60aa018 |
1681 | #define FG_SHADOW 0x00000200UL |
1682 | #define FG_SOLVEPIECE 0x00000400UL |
1683 | #define FG_MAINPIECESH 11 |
1684 | #define FG_SHADOWSH 19 |
1685 | |
1686 | #define PIECE_LBORDER 0x00000001UL |
1687 | #define PIECE_TBORDER 0x00000002UL |
1688 | #define PIECE_RBORDER 0x00000004UL |
1689 | #define PIECE_BBORDER 0x00000008UL |
1690 | #define PIECE_TLCORNER 0x00000010UL |
1691 | #define PIECE_TRCORNER 0x00000020UL |
1692 | #define PIECE_BLCORNER 0x00000040UL |
1693 | #define PIECE_BRCORNER 0x00000080UL |
1694 | #define PIECE_MASK 0x000000FFUL |
ac511ec9 |
1695 | |
1696 | /* |
1697 | * Utility function. |
1698 | */ |
1699 | #define TYPE_MASK 0xF000 |
1700 | #define COL_MASK 0x0FFF |
1701 | #define TYPE_RECT 0x0000 |
1702 | #define TYPE_TLCIRC 0x4000 |
1703 | #define TYPE_TRCIRC 0x5000 |
1704 | #define TYPE_BLCIRC 0x6000 |
1705 | #define TYPE_BRCIRC 0x7000 |
1706 | static void maybe_rect(drawing *dr, int x, int y, int w, int h, int coltype) |
1707 | { |
1708 | int colour = coltype & COL_MASK, type = coltype & TYPE_MASK; |
1709 | |
1710 | if (colour > NCOLOURS) |
1711 | return; |
1712 | if (type == TYPE_RECT) { |
1713 | draw_rect(dr, x, y, w, h, colour); |
1714 | } else { |
1715 | int cx, cy, r; |
1716 | |
1717 | clip(dr, x, y, w, h); |
1718 | |
1719 | cx = x; |
1720 | cy = y; |
1721 | assert(w == h); |
1722 | r = w-1; |
1723 | if (type & 0x1000) |
1724 | cx += r; |
1725 | if (type & 0x2000) |
1726 | cy += r; |
1727 | draw_circle(dr, cx, cy, r, colour, colour); |
1728 | |
1729 | unclip(dr); |
1730 | } |
1731 | } |
1732 | |
a60aa018 |
1733 | static void draw_wallpart(drawing *dr, game_drawstate *ds, |
1734 | int tx, int ty, unsigned long val, |
1735 | int cl, int cc, int ch) |
1736 | { |
1737 | draw_rect(dr, tx, ty, TILESIZE, TILESIZE, cc); |
1738 | if (val & PIECE_LBORDER) |
1739 | draw_rect(dr, tx, ty, HIGHLIGHT_WIDTH, TILESIZE, |
1740 | ch); |
1741 | if (val & PIECE_RBORDER) |
1742 | draw_rect(dr, tx+TILESIZE-HIGHLIGHT_WIDTH, ty, |
1743 | HIGHLIGHT_WIDTH, TILESIZE, cl); |
1744 | if (val & PIECE_TBORDER) |
1745 | draw_rect(dr, tx, ty, TILESIZE, HIGHLIGHT_WIDTH, ch); |
1746 | if (val & PIECE_BBORDER) |
1747 | draw_rect(dr, tx, ty+TILESIZE-HIGHLIGHT_WIDTH, |
1748 | TILESIZE, HIGHLIGHT_WIDTH, cl); |
1749 | if (!((PIECE_BBORDER | PIECE_LBORDER) &~ val)) |
1750 | draw_rect(dr, tx, ty+TILESIZE-HIGHLIGHT_WIDTH, |
1751 | HIGHLIGHT_WIDTH, HIGHLIGHT_WIDTH, cc); |
1752 | if (!((PIECE_TBORDER | PIECE_RBORDER) &~ val)) |
1753 | draw_rect(dr, tx+TILESIZE-HIGHLIGHT_WIDTH, ty, |
1754 | HIGHLIGHT_WIDTH, HIGHLIGHT_WIDTH, cc); |
1755 | if (val & PIECE_TLCORNER) |
1756 | draw_rect(dr, tx, ty, HIGHLIGHT_WIDTH, HIGHLIGHT_WIDTH, ch); |
1757 | if (val & PIECE_BRCORNER) |
1758 | draw_rect(dr, tx+TILESIZE-HIGHLIGHT_WIDTH, |
1759 | ty+TILESIZE-HIGHLIGHT_WIDTH, |
1760 | HIGHLIGHT_WIDTH, HIGHLIGHT_WIDTH, cl); |
1761 | } |
1762 | |
1763 | static void draw_piecepart(drawing *dr, game_drawstate *ds, |
1764 | int tx, int ty, unsigned long val, |
1765 | int cl, int cc, int ch) |
1766 | { |
1767 | int x[6], y[6]; |
1768 | |
1769 | /* |
1770 | * Drawing the blocks is hellishly fiddly. The blocks don't |
1771 | * stretch to the full size of the tile; there's a border |
1772 | * around them of size BORDER_WIDTH. Then they have bevelled |
1773 | * borders of size HIGHLIGHT_WIDTH, and also rounded corners. |
1774 | * |
1775 | * I tried for some time to find a clean and clever way to |
1776 | * figure out what needed drawing from the corner and border |
1777 | * flags, but in the end the cleanest way I could find was the |
1778 | * following. We divide the grid square into 25 parts by |
1779 | * ruling four horizontal and four vertical lines across it; |
1780 | * those lines are at BORDER_WIDTH and BORDER_WIDTH + |
1781 | * HIGHLIGHT_WIDTH from the top, from the bottom, from the |
1782 | * left and from the right. Then we carefully consider each of |
1783 | * the resulting 25 sections of square, and decide separately |
1784 | * what needs to go in it based on the flags. In complicated |
1785 | * cases there can be up to five possibilities affecting any |
1786 | * given section (no corner or border flags, just the corner |
1787 | * flag, one border flag, the other border flag, both border |
1788 | * flags). So there's a lot of very fiddly logic here and all |
1789 | * I could really think to do was give it my best shot and |
1790 | * then test it and correct all the typos. Not fun to write, |
1791 | * and I'm sure it isn't fun to read either, but it seems to |
1792 | * work. |
1793 | */ |
1794 | |
1795 | x[0] = tx; |
1796 | x[1] = x[0] + BORDER_WIDTH; |
1797 | x[2] = x[1] + HIGHLIGHT_WIDTH; |
1798 | x[5] = tx + TILESIZE; |
1799 | x[4] = x[5] - BORDER_WIDTH; |
1800 | x[3] = x[4] - HIGHLIGHT_WIDTH; |
1801 | |
1802 | y[0] = ty; |
1803 | y[1] = y[0] + BORDER_WIDTH; |
1804 | y[2] = y[1] + HIGHLIGHT_WIDTH; |
1805 | y[5] = ty + TILESIZE; |
1806 | y[4] = y[5] - BORDER_WIDTH; |
1807 | y[3] = y[4] - HIGHLIGHT_WIDTH; |
1808 | |
1809 | #define RECT(p,q) x[p], y[q], x[(p)+1]-x[p], y[(q)+1]-y[q] |
1810 | |
1811 | maybe_rect(dr, RECT(0,0), |
1812 | (val & (PIECE_TLCORNER | PIECE_TBORDER | |
1813 | PIECE_LBORDER)) ? -1 : cc); |
1814 | maybe_rect(dr, RECT(1,0), |
1815 | (val & PIECE_TLCORNER) ? ch : (val & PIECE_TBORDER) ? -1 : |
1816 | (val & PIECE_LBORDER) ? ch : cc); |
1817 | maybe_rect(dr, RECT(2,0), |
1818 | (val & PIECE_TBORDER) ? -1 : cc); |
1819 | maybe_rect(dr, RECT(3,0), |
1820 | (val & PIECE_TRCORNER) ? cl : (val & PIECE_TBORDER) ? -1 : |
1821 | (val & PIECE_RBORDER) ? cl : cc); |
1822 | maybe_rect(dr, RECT(4,0), |
1823 | (val & (PIECE_TRCORNER | PIECE_TBORDER | |
1824 | PIECE_RBORDER)) ? -1 : cc); |
1825 | maybe_rect(dr, RECT(0,1), |
1826 | (val & PIECE_TLCORNER) ? ch : (val & PIECE_LBORDER) ? -1 : |
1827 | (val & PIECE_TBORDER) ? ch : cc); |
1828 | maybe_rect(dr, RECT(1,1), |
1829 | (val & PIECE_TLCORNER) ? cc : -1); |
1830 | maybe_rect(dr, RECT(1,1), |
1831 | (val & PIECE_TLCORNER) ? ch | TYPE_TLCIRC : |
1832 | !((PIECE_TBORDER | PIECE_LBORDER) &~ val) ? ch | TYPE_BRCIRC : |
1833 | (val & (PIECE_TBORDER | PIECE_LBORDER)) ? ch : cc); |
1834 | maybe_rect(dr, RECT(2,1), |
1835 | (val & PIECE_TBORDER) ? ch : cc); |
1836 | maybe_rect(dr, RECT(3,1), |
1837 | (val & (PIECE_TBORDER | PIECE_RBORDER)) == PIECE_TBORDER ? ch : |
1838 | (val & (PIECE_TBORDER | PIECE_RBORDER)) == PIECE_RBORDER ? cl : |
1839 | !((PIECE_TBORDER|PIECE_RBORDER) &~ val) ? cc | TYPE_BLCIRC : |
1840 | cc); |
1841 | maybe_rect(dr, RECT(4,1), |
1842 | (val & PIECE_TRCORNER) ? ch : (val & PIECE_RBORDER) ? -1 : |
1843 | (val & PIECE_TBORDER) ? ch : cc); |
1844 | maybe_rect(dr, RECT(0,2), |
1845 | (val & PIECE_LBORDER) ? -1 : cc); |
1846 | maybe_rect(dr, RECT(1,2), |
1847 | (val & PIECE_LBORDER) ? ch : cc); |
1848 | maybe_rect(dr, RECT(2,2), |
1849 | cc); |
1850 | maybe_rect(dr, RECT(3,2), |
1851 | (val & PIECE_RBORDER) ? cl : cc); |
1852 | maybe_rect(dr, RECT(4,2), |
1853 | (val & PIECE_RBORDER) ? -1 : cc); |
1854 | maybe_rect(dr, RECT(0,3), |
1855 | (val & PIECE_BLCORNER) ? cl : (val & PIECE_LBORDER) ? -1 : |
1856 | (val & PIECE_BBORDER) ? cl : cc); |
1857 | maybe_rect(dr, RECT(1,3), |
1858 | (val & (PIECE_BBORDER | PIECE_LBORDER)) == PIECE_BBORDER ? cl : |
1859 | (val & (PIECE_BBORDER | PIECE_LBORDER)) == PIECE_LBORDER ? ch : |
1860 | !((PIECE_BBORDER|PIECE_LBORDER) &~ val) ? cc | TYPE_TRCIRC : |
1861 | cc); |
1862 | maybe_rect(dr, RECT(2,3), |
1863 | (val & PIECE_BBORDER) ? cl : cc); |
1864 | maybe_rect(dr, RECT(3,3), |
1865 | (val & PIECE_BRCORNER) ? cc : -1); |
1866 | maybe_rect(dr, RECT(3,3), |
1867 | (val & PIECE_BRCORNER) ? cl | TYPE_BRCIRC : |
1868 | !((PIECE_BBORDER | PIECE_RBORDER) &~ val) ? cl | TYPE_TLCIRC : |
1869 | (val & (PIECE_BBORDER | PIECE_RBORDER)) ? cl : cc); |
1870 | maybe_rect(dr, RECT(4,3), |
1871 | (val & PIECE_BRCORNER) ? cl : (val & PIECE_RBORDER) ? -1 : |
1872 | (val & PIECE_BBORDER) ? cl : cc); |
1873 | maybe_rect(dr, RECT(0,4), |
1874 | (val & (PIECE_BLCORNER | PIECE_BBORDER | PIECE_LBORDER)) ? -1 : cc); |
1875 | maybe_rect(dr, RECT(1,4), |
1876 | (val & PIECE_BLCORNER) ? ch : (val & PIECE_BBORDER) ? -1 : |
1877 | (val & PIECE_LBORDER) ? ch : cc); |
1878 | maybe_rect(dr, RECT(2,4), |
1879 | (val & PIECE_BBORDER) ? -1 : cc); |
1880 | maybe_rect(dr, RECT(3,4), |
1881 | (val & PIECE_BRCORNER) ? cl : (val & PIECE_BBORDER) ? -1 : |
1882 | (val & PIECE_RBORDER) ? cl : cc); |
1883 | maybe_rect(dr, RECT(4,4), |
1884 | (val & (PIECE_BRCORNER | PIECE_BBORDER | |
1885 | PIECE_RBORDER)) ? -1 : cc); |
1886 | |
1887 | #undef RECT |
1888 | } |
1889 | |
ac511ec9 |
1890 | static void draw_tile(drawing *dr, game_drawstate *ds, |
1891 | int x, int y, unsigned long val) |
1892 | { |
1893 | int tx = COORD(x), ty = COORD(y); |
1894 | int cc, ch, cl; |
1895 | |
1896 | /* |
1897 | * Draw the tile background. |
1898 | */ |
1899 | if (val & BG_TARGET) |
1900 | cc = COL_TARGET; |
1901 | else |
1902 | cc = COL_BACKGROUND; |
1903 | ch = cc+1; |
1904 | cl = cc+2; |
1905 | if (val & FLASH_LOW) |
1906 | cc = cl; |
1907 | else if (val & FLASH_HIGH) |
1908 | cc = ch; |
1909 | |
1910 | draw_rect(dr, tx, ty, TILESIZE, TILESIZE, cc); |
1911 | if (val & BG_FORCEFIELD) { |
1912 | /* |
1913 | * Cattle-grid effect to indicate that nothing but the |
1914 | * main block can slide over this square. |
1915 | */ |
1916 | int n = 3 * (TILESIZE / (3*HIGHLIGHT_WIDTH)); |
1917 | int i; |
1918 | |
1919 | for (i = 1; i < n; i += 3) { |
1920 | draw_rect(dr, tx,ty+(TILESIZE*i/n), TILESIZE,HIGHLIGHT_WIDTH, cl); |
1921 | draw_rect(dr, tx+(TILESIZE*i/n),ty, HIGHLIGHT_WIDTH,TILESIZE, cl); |
1922 | } |
1923 | } |
1924 | |
1925 | /* |
a60aa018 |
1926 | * Draw the tile midground: a shadow of a block, for |
1927 | * displaying partial solutions. |
1928 | */ |
1929 | if (val & FG_SHADOW) { |
1930 | draw_piecepart(dr, ds, tx, ty, (val >> FG_SHADOWSH) & PIECE_MASK, |
1931 | cl, cl, cl); |
1932 | } |
1933 | |
1934 | /* |
ac511ec9 |
1935 | * Draw the tile foreground, i.e. some section of a block or |
1936 | * wall. |
1937 | */ |
1938 | if (val & FG_WALL) { |
1939 | cc = COL_BACKGROUND; |
1940 | ch = cc+1; |
1941 | cl = cc+2; |
1942 | if (val & FLASH_LOW) |
1943 | cc = cl; |
1944 | else if (val & FLASH_HIGH) |
1945 | cc = ch; |
1946 | |
a60aa018 |
1947 | draw_wallpart(dr, ds, tx, ty, (val >> FG_MAINPIECESH) & PIECE_MASK, |
1948 | cl, cc, ch); |
ac511ec9 |
1949 | } else if (val & (FG_MAIN | FG_NORMAL)) { |
ac511ec9 |
1950 | if (val & FG_DRAGGING) |
1951 | cc = (val & FG_MAIN ? COL_MAIN_DRAGGING : COL_DRAGGING); |
1952 | else |
1953 | cc = (val & FG_MAIN ? COL_MAIN : COL_BACKGROUND); |
1954 | ch = cc+1; |
1955 | cl = cc+2; |
1956 | |
1957 | if (val & FLASH_LOW) |
1958 | cc = cl; |
a60aa018 |
1959 | else if (val & (FLASH_HIGH | FG_SOLVEPIECE)) |
ac511ec9 |
1960 | cc = ch; |
1961 | |
a60aa018 |
1962 | draw_piecepart(dr, ds, tx, ty, (val >> FG_MAINPIECESH) & PIECE_MASK, |
1963 | cl, cc, ch); |
ac511ec9 |
1964 | } |
1965 | |
1966 | draw_update(dr, tx, ty, TILESIZE, TILESIZE); |
1967 | } |
1968 | |
a60aa018 |
1969 | static unsigned long find_piecepart(int w, int h, int *dsf, int x, int y) |
1970 | { |
1971 | int i = y*w+x; |
1972 | int canon = dsf_canonify(dsf, i); |
1973 | unsigned long val = 0; |
1974 | |
1975 | if (x == 0 || canon != dsf_canonify(dsf, i-1)) |
1976 | val |= PIECE_LBORDER; |
1977 | if (y== 0 || canon != dsf_canonify(dsf, i-w)) |
1978 | val |= PIECE_TBORDER; |
1979 | if (x == w-1 || canon != dsf_canonify(dsf, i+1)) |
1980 | val |= PIECE_RBORDER; |
1981 | if (y == h-1 || canon != dsf_canonify(dsf, i+w)) |
1982 | val |= PIECE_BBORDER; |
1983 | if (!(val & (PIECE_TBORDER | PIECE_LBORDER)) && |
1984 | canon != dsf_canonify(dsf, i-1-w)) |
1985 | val |= PIECE_TLCORNER; |
1986 | if (!(val & (PIECE_TBORDER | PIECE_RBORDER)) && |
1987 | canon != dsf_canonify(dsf, i+1-w)) |
1988 | val |= PIECE_TRCORNER; |
1989 | if (!(val & (PIECE_BBORDER | PIECE_LBORDER)) && |
1990 | canon != dsf_canonify(dsf, i-1+w)) |
1991 | val |= PIECE_BLCORNER; |
1992 | if (!(val & (PIECE_BBORDER | PIECE_RBORDER)) && |
1993 | canon != dsf_canonify(dsf, i+1+w)) |
1994 | val |= PIECE_BRCORNER; |
1995 | return val; |
1996 | } |
1997 | |
ac511ec9 |
1998 | static void game_redraw(drawing *dr, game_drawstate *ds, game_state *oldstate, |
1999 | game_state *state, int dir, game_ui *ui, |
2000 | float animtime, float flashtime) |
2001 | { |
2002 | int w = state->w, h = state->h, wh = w*h; |
2003 | unsigned char *board; |
2004 | int *dsf; |
a60aa018 |
2005 | int x, y, mainanchor, mainpos, dragpos, solvepos, solvesrc, solvedst; |
ac511ec9 |
2006 | |
2007 | if (!ds->started) { |
2008 | /* |
2009 | * The initial contents of the window are not guaranteed |
2010 | * and can vary with front ends. To be on the safe side, |
2011 | * all games should start by drawing a big |
2012 | * background-colour rectangle covering the whole window. |
2013 | */ |
2014 | draw_rect(dr, 0, 0, 10*ds->tilesize, 10*ds->tilesize, COL_BACKGROUND); |
2015 | ds->started = TRUE; |
2016 | } |
2017 | |
2018 | /* |
2019 | * Construct the board we'll be displaying (which may be |
2020 | * different from the one in state if ui describes a drag in |
2021 | * progress). |
2022 | */ |
2023 | board = snewn(wh, unsigned char); |
2024 | memcpy(board, state->board, wh); |
2025 | if (ui->dragging) { |
2026 | int mpret = move_piece(w, h, state->board, board, |
2027 | state->imm->forcefield, |
2028 | ui->drag_anchor, ui->drag_currpos); |
2029 | assert(mpret); |
2030 | } |
2031 | |
a60aa018 |
2032 | if (state->soln) { |
2033 | solvesrc = state->soln->moves[state->soln_index*2]; |
2034 | solvedst = state->soln->moves[state->soln_index*2+1]; |
2035 | if (solvesrc == state->lastmoved_pos) |
2036 | solvesrc = state->lastmoved; |
2037 | if (solvesrc == ui->drag_anchor) |
2038 | solvesrc = ui->drag_currpos; |
2039 | } else |
2040 | solvesrc = solvedst = -1; |
2041 | |
ac511ec9 |
2042 | /* |
2043 | * Build a dsf out of that board, so we can conveniently tell |
2044 | * which edges are connected and which aren't. |
2045 | */ |
2046 | dsf = snew_dsf(wh); |
2047 | mainanchor = -1; |
2048 | for (y = 0; y < h; y++) |
2049 | for (x = 0; x < w; x++) { |
2050 | int i = y*w+x; |
2051 | |
2052 | if (ISDIST(board[i])) |
2053 | dsf_merge(dsf, i, i - board[i]); |
2054 | if (board[i] == MAINANCHOR) |
2055 | mainanchor = i; |
2056 | if (board[i] == WALL) { |
2057 | if (x > 0 && board[i-1] == WALL) |
2058 | dsf_merge(dsf, i, i-1); |
2059 | if (y > 0 && board[i-w] == WALL) |
2060 | dsf_merge(dsf, i, i-w); |
2061 | } |
2062 | } |
2063 | assert(mainanchor >= 0); |
2064 | mainpos = dsf_canonify(dsf, mainanchor); |
2065 | dragpos = ui->drag_currpos > 0 ? dsf_canonify(dsf, ui->drag_currpos) : -1; |
a60aa018 |
2066 | solvepos = solvesrc >= 0 ? dsf_canonify(dsf, solvesrc) : -1; |
ac511ec9 |
2067 | |
2068 | /* |
2069 | * Now we can construct the data about what we want to draw. |
2070 | */ |
2071 | for (y = 0; y < h; y++) |
2072 | for (x = 0; x < w; x++) { |
2073 | int i = y*w+x; |
2074 | int j; |
2075 | unsigned long val; |
2076 | int canon; |
2077 | |
2078 | /* |
2079 | * See if this square is part of the target area. |
2080 | */ |
2081 | j = i + mainanchor - (state->ty * w + state->tx); |
2082 | while (j >= 0 && j < wh && ISDIST(board[j])) |
2083 | j -= board[j]; |
2084 | if (j == mainanchor) |
2085 | val = BG_TARGET; |
2086 | else |
2087 | val = BG_NORMAL; |
2088 | |
2089 | if (state->imm->forcefield[i]) |
2090 | val |= BG_FORCEFIELD; |
2091 | |
2092 | if (flashtime > 0) { |
2093 | int flashtype = (int)(flashtime / FLASH_INTERVAL) & 1; |
2094 | val |= (flashtype ? FLASH_LOW : FLASH_HIGH); |
2095 | } |
2096 | |
2097 | if (board[i] != EMPTY) { |
2098 | canon = dsf_canonify(dsf, i); |
2099 | |
2100 | if (board[i] == WALL) |
2101 | val |= FG_WALL; |
2102 | else if (canon == mainpos) |
2103 | val |= FG_MAIN; |
2104 | else |
2105 | val |= FG_NORMAL; |
2106 | if (canon == dragpos) |
2107 | val |= FG_DRAGGING; |
a60aa018 |
2108 | if (canon == solvepos) |
2109 | val |= FG_SOLVEPIECE; |
ac511ec9 |
2110 | |
2111 | /* |
2112 | * Now look around to see if other squares |
2113 | * belonging to the same block are adjacent to us. |
2114 | */ |
a60aa018 |
2115 | val |= find_piecepart(w, h, dsf, x, y) << FG_MAINPIECESH; |
2116 | } |
2117 | |
2118 | /* |
2119 | * If we're in the middle of showing a solution, |
2120 | * display a shadow piece for the target of the |
2121 | * current move. |
2122 | */ |
2123 | if (solvepos >= 0) { |
2124 | int si = i - solvedst + solvesrc; |
2125 | if (si >= 0 && si < wh && dsf_canonify(dsf, si) == solvepos) { |
2126 | val |= find_piecepart(w, h, dsf, |
2127 | si % w, si / w) << FG_SHADOWSH; |
2128 | val |= FG_SHADOW; |
2129 | } |
ac511ec9 |
2130 | } |
2131 | |
2132 | if (val != ds->grid[i]) { |
2133 | draw_tile(dr, ds, x, y, val); |
2134 | ds->grid[i] = val; |
2135 | } |
2136 | } |
2137 | |
2138 | /* |
2139 | * Update the status bar. |
2140 | */ |
2141 | { |
2142 | char statusbuf[256]; |
2143 | |
ac511ec9 |
2144 | sprintf(statusbuf, "%sMoves: %d", |
a60aa018 |
2145 | (state->completed >= 0 ? |
2146 | (state->cheated ? "Auto-solved. " : "COMPLETED! ") : |
2147 | (state->cheated ? "Auto-solver used. " : "")), |
ac511ec9 |
2148 | (state->completed >= 0 ? state->completed : state->movecount)); |
39bdcaad |
2149 | if (state->minmoves >= 0) |
ac511ec9 |
2150 | sprintf(statusbuf+strlen(statusbuf), " (min %d)", |
2151 | state->minmoves); |
2152 | |
2153 | status_bar(dr, statusbuf); |
2154 | } |
2155 | |
2156 | sfree(dsf); |
2157 | sfree(board); |
2158 | } |
2159 | |
2160 | static float game_anim_length(game_state *oldstate, game_state *newstate, |
2161 | int dir, game_ui *ui) |
2162 | { |
2163 | return 0.0F; |
2164 | } |
2165 | |
2166 | static float game_flash_length(game_state *oldstate, game_state *newstate, |
2167 | int dir, game_ui *ui) |
2168 | { |
2169 | if (oldstate->completed < 0 && newstate->completed >= 0) |
2170 | return FLASH_TIME; |
2171 | |
2172 | return 0.0F; |
2173 | } |
2174 | |
2175 | static int game_timing_state(game_state *state, game_ui *ui) |
2176 | { |
2177 | return TRUE; |
2178 | } |
2179 | |
2180 | static void game_print_size(game_params *params, float *x, float *y) |
2181 | { |
2182 | } |
2183 | |
2184 | static void game_print(drawing *dr, game_state *state, int tilesize) |
2185 | { |
2186 | } |
2187 | |
2188 | #ifdef COMBINED |
2189 | #define thegame nullgame |
2190 | #endif |
2191 | |
2192 | const struct game thegame = { |
2193 | "Slide", NULL, NULL, |
2194 | default_params, |
2195 | game_fetch_preset, |
2196 | decode_params, |
2197 | encode_params, |
2198 | free_params, |
2199 | dup_params, |
2200 | TRUE, game_configure, custom_params, |
2201 | validate_params, |
2202 | new_game_desc, |
2203 | validate_desc, |
2204 | new_game, |
2205 | dup_game, |
2206 | free_game, |
a60aa018 |
2207 | TRUE, solve_game, |
ac511ec9 |
2208 | TRUE, game_text_format, |
2209 | new_ui, |
2210 | free_ui, |
2211 | encode_ui, |
2212 | decode_ui, |
2213 | game_changed_state, |
2214 | interpret_move, |
2215 | execute_move, |
2216 | PREFERRED_TILESIZE, game_compute_size, game_set_size, |
2217 | game_colours, |
2218 | game_new_drawstate, |
2219 | game_free_drawstate, |
2220 | game_redraw, |
2221 | game_anim_length, |
2222 | game_flash_length, |
2223 | FALSE, FALSE, game_print_size, game_print, |
2224 | TRUE, /* wants_statusbar */ |
2225 | FALSE, game_timing_state, |
2226 | 0, /* flags */ |
2227 | }; |
b48c4c04 |
2228 | |
2229 | #ifdef STANDALONE_SOLVER |
2230 | |
2231 | #include <stdarg.h> |
2232 | |
2233 | int main(int argc, char **argv) |
2234 | { |
2235 | game_params *p; |
2236 | game_state *s; |
2237 | char *id = NULL, *desc, *err; |
2238 | int count = FALSE; |
2239 | int ret, really_verbose = FALSE; |
2240 | int *moves; |
2241 | |
2242 | while (--argc > 0) { |
2243 | char *p = *++argv; |
2244 | if (!strcmp(p, "-v")) { |
2245 | really_verbose = TRUE; |
2246 | } else if (!strcmp(p, "-c")) { |
2247 | count = TRUE; |
2248 | } else if (*p == '-') { |
2249 | fprintf(stderr, "%s: unrecognised option `%s'\n", argv[0], p); |
2250 | return 1; |
2251 | } else { |
2252 | id = p; |
2253 | } |
2254 | } |
2255 | |
2256 | if (!id) { |
2257 | fprintf(stderr, "usage: %s [-c | -v] <game_id>\n", argv[0]); |
2258 | return 1; |
2259 | } |
2260 | |
2261 | desc = strchr(id, ':'); |
2262 | if (!desc) { |
2263 | fprintf(stderr, "%s: game id expects a colon in it\n", argv[0]); |
2264 | return 1; |
2265 | } |
2266 | *desc++ = '\0'; |
2267 | |
2268 | p = default_params(); |
2269 | decode_params(p, id); |
2270 | err = validate_desc(p, desc); |
2271 | if (err) { |
2272 | fprintf(stderr, "%s: %s\n", argv[0], err); |
2273 | return 1; |
2274 | } |
2275 | s = new_game(NULL, p, desc); |
2276 | |
2277 | ret = solve_board(s->w, s->h, s->board, s->imm->forcefield, |
2278 | s->tx, s->ty, -1, &moves); |
2279 | if (ret < 0) { |
2280 | printf("No solution found\n"); |
2281 | } else { |
2282 | int index = 0; |
2283 | if (count) { |
2284 | printf("%d moves required\n", ret); |
2285 | return 0; |
2286 | } |
2287 | while (1) { |
2288 | int moveret; |
2289 | char *text = board_text_format(s->w, s->h, s->board, |
2290 | s->imm->forcefield); |
2291 | game_state *s2; |
2292 | |
2293 | printf("position %d:\n%s", index, text); |
2294 | |
2295 | if (index >= ret) |
2296 | break; |
2297 | |
2298 | s2 = dup_game(s); |
2299 | moveret = move_piece(s->w, s->h, s->board, |
2300 | s2->board, s->imm->forcefield, |
2301 | moves[index*2], moves[index*2+1]); |
2302 | assert(moveret); |
2303 | |
2304 | free_game(s); |
2305 | s = s2; |
2306 | index++; |
2307 | } |
2308 | } |
2309 | |
2310 | return 0; |
2311 | } |
2312 | |
2313 | #endif |