dafd6cf6 |
1 | /* |
2 | * drawing.c: Intermediary between the drawing interface as |
3 | * presented to the back end, and that implemented by the front |
4 | * end. |
5 | * |
6 | * Mostly just looks up calls in a vtable and passes them through |
7 | * unchanged. However, on the printing side it tracks print colours |
8 | * so the front end API doesn't have to. |
9 | * |
83c0438f |
10 | * FIXME: |
11 | * |
12 | * - I'd _like_ to do automatic draw_updates, but it's a pain for |
13 | * draw_text in particular. I'd have to invent a front end API |
14 | * which retrieved the text bounds. |
15 | * + that might allow me to do the alignment centrally as well? |
16 | * * perhaps not, because PS can't return this information, |
17 | * so there would have to be a special case for it. |
18 | * + however, that at least doesn't stand in the way of using |
19 | * the text bounds for draw_update, because PS doesn't need |
20 | * draw_update since it's printing-only. Any _interactive_ |
21 | * drawing API couldn't get away with refusing to tell you |
22 | * what parts of the screen a text draw had covered, because |
23 | * you would inevitably need to erase it later on. |
dafd6cf6 |
24 | */ |
25 | |
26 | #include <stdio.h> |
27 | #include <stdlib.h> |
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28 | #include <string.h> |
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29 | #include <assert.h> |
30 | #include <math.h> |
31 | |
32 | #include "puzzles.h" |
33 | |
34 | struct print_colour { |
35 | int hatch; |
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36 | int hatch_when; /* 0=never 1=only-in-b&w 2=always */ |
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37 | float r, g, b; |
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38 | float grey; |
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39 | }; |
40 | |
41 | struct drawing { |
42 | const drawing_api *api; |
43 | void *handle; |
44 | struct print_colour *colours; |
45 | int ncolours, coloursize; |
46 | float scale; |
83c0438f |
47 | /* `me' is only used in status_bar(), so print-oriented instances of |
48 | * this may set it to NULL. */ |
49 | midend *me; |
50 | char *laststatus; |
dafd6cf6 |
51 | }; |
52 | |
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53 | drawing *drawing_new(const drawing_api *api, midend *me, void *handle) |
dafd6cf6 |
54 | { |
55 | drawing *dr = snew(drawing); |
56 | dr->api = api; |
57 | dr->handle = handle; |
58 | dr->colours = NULL; |
59 | dr->ncolours = dr->coloursize = 0; |
60 | dr->scale = 1.0F; |
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61 | dr->me = me; |
62 | dr->laststatus = NULL; |
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63 | return dr; |
64 | } |
65 | |
66 | void drawing_free(drawing *dr) |
67 | { |
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68 | sfree(dr->laststatus); |
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69 | sfree(dr->colours); |
70 | sfree(dr); |
71 | } |
72 | |
73 | void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize, |
74 | int align, int colour, char *text) |
75 | { |
76 | dr->api->draw_text(dr->handle, x, y, fonttype, fontsize, align, |
77 | colour, text); |
78 | } |
79 | |
80 | void draw_rect(drawing *dr, int x, int y, int w, int h, int colour) |
81 | { |
82 | dr->api->draw_rect(dr->handle, x, y, w, h, colour); |
83 | } |
84 | |
85 | void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour) |
86 | { |
87 | dr->api->draw_line(dr->handle, x1, y1, x2, y2, colour); |
88 | } |
89 | |
a39c3aa0 |
90 | void draw_thick_line(drawing *dr, float thickness, |
91 | float x1, float y1, float x2, float y2, int colour) |
92 | { |
93 | if (dr->api->draw_thick_line) { |
94 | dr->api->draw_thick_line(dr->handle, thickness, |
95 | x1, y1, x2, y2, colour); |
96 | } else { |
97 | /* We'll fake it up with a filled polygon. The tweak to the |
98 | * thickness empirically compensates for rounding errors, because |
99 | * polygon rendering uses integer coordinates. |
100 | */ |
101 | float len = sqrt((x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1)); |
102 | float tvhatx = (x2 - x1)/len * (thickness/2 - 0.2); |
103 | float tvhaty = (y2 - y1)/len * (thickness/2 - 0.2); |
104 | int p[8]; |
105 | |
106 | p[0] = x1 - tvhaty; |
107 | p[1] = y1 + tvhatx; |
108 | p[2] = x2 - tvhaty; |
109 | p[3] = y2 + tvhatx; |
110 | p[4] = x2 + tvhaty; |
111 | p[5] = y2 - tvhatx; |
112 | p[6] = x1 + tvhaty; |
113 | p[7] = y1 - tvhatx; |
114 | dr->api->draw_polygon(dr->handle, p, 4, colour, colour); |
115 | } |
116 | } |
117 | |
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118 | void draw_polygon(drawing *dr, int *coords, int npoints, |
119 | int fillcolour, int outlinecolour) |
120 | { |
121 | dr->api->draw_polygon(dr->handle, coords, npoints, fillcolour, |
122 | outlinecolour); |
123 | } |
124 | |
125 | void draw_circle(drawing *dr, int cx, int cy, int radius, |
126 | int fillcolour, int outlinecolour) |
127 | { |
128 | dr->api->draw_circle(dr->handle, cx, cy, radius, fillcolour, |
129 | outlinecolour); |
130 | } |
131 | |
132 | void draw_update(drawing *dr, int x, int y, int w, int h) |
133 | { |
134 | if (dr->api->draw_update) |
135 | dr->api->draw_update(dr->handle, x, y, w, h); |
136 | } |
137 | |
138 | void clip(drawing *dr, int x, int y, int w, int h) |
139 | { |
140 | dr->api->clip(dr->handle, x, y, w, h); |
141 | } |
142 | |
143 | void unclip(drawing *dr) |
144 | { |
145 | dr->api->unclip(dr->handle); |
146 | } |
147 | |
148 | void start_draw(drawing *dr) |
149 | { |
150 | dr->api->start_draw(dr->handle); |
151 | } |
152 | |
153 | void end_draw(drawing *dr) |
154 | { |
155 | dr->api->end_draw(dr->handle); |
156 | } |
157 | |
4011952c |
158 | char *text_fallback(drawing *dr, const char *const *strings, int nstrings) |
159 | { |
160 | int i; |
161 | |
162 | /* |
163 | * If the drawing implementation provides one of these, use it. |
164 | */ |
165 | if (dr && dr->api->text_fallback) |
166 | return dr->api->text_fallback(dr->handle, strings, nstrings); |
167 | |
168 | /* |
169 | * Otherwise, do the simple thing and just pick the first string |
170 | * that fits in plain ASCII. It will then need no translation |
171 | * out of UTF-8. |
172 | */ |
173 | for (i = 0; i < nstrings; i++) { |
174 | const char *p; |
175 | |
176 | for (p = strings[i]; *p; p++) |
177 | if (*p & 0x80) |
178 | break; |
179 | if (!*p) |
180 | return dupstr(strings[i]); |
181 | } |
182 | |
183 | /* |
184 | * The caller was responsible for making sure _some_ string in |
185 | * the list was in plain ASCII. |
186 | */ |
187 | assert(!"Should never get here"); |
188 | return NULL; /* placate optimiser */ |
189 | } |
190 | |
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191 | void status_bar(drawing *dr, char *text) |
192 | { |
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193 | char *rewritten; |
194 | |
195 | if (!dr->api->status_bar) |
196 | return; |
197 | |
198 | assert(dr->me); |
199 | |
200 | rewritten = midend_rewrite_statusbar(dr->me, text); |
201 | if (!dr->laststatus || strcmp(rewritten, dr->laststatus)) { |
202 | dr->api->status_bar(dr->handle, rewritten); |
203 | sfree(dr->laststatus); |
204 | dr->laststatus = rewritten; |
205 | } else { |
206 | sfree(rewritten); |
207 | } |
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208 | } |
209 | |
210 | blitter *blitter_new(drawing *dr, int w, int h) |
211 | { |
212 | return dr->api->blitter_new(dr->handle, w, h); |
213 | } |
214 | |
215 | void blitter_free(drawing *dr, blitter *bl) |
216 | { |
217 | dr->api->blitter_free(dr->handle, bl); |
218 | } |
219 | |
220 | void blitter_save(drawing *dr, blitter *bl, int x, int y) |
221 | { |
222 | dr->api->blitter_save(dr->handle, bl, x, y); |
223 | } |
224 | |
225 | void blitter_load(drawing *dr, blitter *bl, int x, int y) |
226 | { |
227 | dr->api->blitter_load(dr->handle, bl, x, y); |
228 | } |
229 | |
230 | void print_begin_doc(drawing *dr, int pages) |
231 | { |
232 | dr->api->begin_doc(dr->handle, pages); |
233 | } |
234 | |
235 | void print_begin_page(drawing *dr, int number) |
236 | { |
237 | dr->api->begin_page(dr->handle, number); |
238 | } |
239 | |
240 | void print_begin_puzzle(drawing *dr, float xm, float xc, |
241 | float ym, float yc, int pw, int ph, float wmm, |
242 | float scale) |
243 | { |
244 | dr->scale = scale; |
245 | dr->ncolours = 0; |
246 | dr->api->begin_puzzle(dr->handle, xm, xc, ym, yc, pw, ph, wmm); |
247 | } |
248 | |
249 | void print_end_puzzle(drawing *dr) |
250 | { |
251 | dr->api->end_puzzle(dr->handle); |
252 | dr->scale = 1.0F; |
253 | } |
254 | |
255 | void print_end_page(drawing *dr, int number) |
256 | { |
257 | dr->api->end_page(dr->handle, number); |
258 | } |
259 | |
260 | void print_end_doc(drawing *dr) |
261 | { |
262 | dr->api->end_doc(dr->handle); |
263 | } |
264 | |
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265 | void print_get_colour(drawing *dr, int colour, int printing_in_colour, |
266 | int *hatch, float *r, float *g, float *b) |
dafd6cf6 |
267 | { |
268 | assert(colour >= 0 && colour < dr->ncolours); |
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269 | if (dr->colours[colour].hatch_when == 2 || |
270 | (dr->colours[colour].hatch_when == 1 && !printing_in_colour)) { |
271 | *hatch = dr->colours[colour].hatch; |
272 | } else { |
273 | *hatch = -1; |
274 | if (printing_in_colour) { |
275 | *r = dr->colours[colour].r; |
276 | *g = dr->colours[colour].g; |
277 | *b = dr->colours[colour].b; |
278 | } else { |
279 | *r = *g = *b = dr->colours[colour].grey; |
280 | } |
281 | } |
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282 | } |
283 | |
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284 | static int print_generic_colour(drawing *dr, float r, float g, float b, |
285 | float grey, int hatch, int hatch_when) |
dafd6cf6 |
286 | { |
287 | if (dr->ncolours >= dr->coloursize) { |
288 | dr->coloursize = dr->ncolours + 16; |
289 | dr->colours = sresize(dr->colours, dr->coloursize, |
290 | struct print_colour); |
291 | } |
292 | dr->colours[dr->ncolours].hatch = hatch; |
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293 | dr->colours[dr->ncolours].hatch_when = hatch_when; |
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294 | dr->colours[dr->ncolours].r = r; |
295 | dr->colours[dr->ncolours].g = g; |
296 | dr->colours[dr->ncolours].b = b; |
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297 | dr->colours[dr->ncolours].grey = grey; |
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298 | return dr->ncolours++; |
299 | } |
300 | |
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301 | int print_mono_colour(drawing *dr, int grey) |
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302 | { |
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303 | return print_generic_colour(dr, grey, grey, grey, grey, -1, 0); |
dafd6cf6 |
304 | } |
305 | |
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306 | int print_grey_colour(drawing *dr, float grey) |
307 | { |
308 | return print_generic_colour(dr, grey, grey, grey, grey, -1, 0); |
309 | } |
310 | |
311 | int print_hatched_colour(drawing *dr, int hatch) |
312 | { |
313 | return print_generic_colour(dr, 0, 0, 0, 0, hatch, 2); |
314 | } |
315 | |
316 | int print_rgb_mono_colour(drawing *dr, float r, float g, float b, int grey) |
317 | { |
318 | return print_generic_colour(dr, r, g, b, grey, -1, 0); |
319 | } |
320 | |
321 | int print_rgb_grey_colour(drawing *dr, float r, float g, float b, float grey) |
322 | { |
323 | return print_generic_colour(dr, r, g, b, grey, -1, 0); |
324 | } |
325 | |
326 | int print_rgb_hatched_colour(drawing *dr, float r, float g, float b, int hatch) |
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327 | { |
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328 | return print_generic_colour(dr, r, g, b, 0, hatch, 1); |
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329 | } |
330 | |
331 | void print_line_width(drawing *dr, int width) |
332 | { |
333 | /* |
334 | * I don't think it's entirely sensible to have line widths be |
335 | * entirely relative to the puzzle size; there is a point |
336 | * beyond which lines are just _stupidly_ thick. On the other |
337 | * hand, absolute line widths aren't particularly nice either |
338 | * because they start to feel a bit feeble at really large |
339 | * scales. |
340 | * |
341 | * My experimental answer is to scale line widths as the |
342 | * _square root_ of the main puzzle scale. Double the puzzle |
343 | * size, and the line width multiplies by 1.4. |
344 | */ |
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345 | dr->api->line_width(dr->handle, (float)sqrt(dr->scale) * width); |
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346 | } |
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347 | |
348 | void print_line_dotted(drawing *dr, int dotted) |
349 | { |
350 | dr->api->line_dotted(dr->handle, dotted); |
351 | } |