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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 | * |
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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. |
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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; |
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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 | |
90 | void draw_polygon(drawing *dr, int *coords, int npoints, |
91 | int fillcolour, int outlinecolour) |
92 | { |
93 | dr->api->draw_polygon(dr->handle, coords, npoints, fillcolour, |
94 | outlinecolour); |
95 | } |
96 | |
97 | void draw_circle(drawing *dr, int cx, int cy, int radius, |
98 | int fillcolour, int outlinecolour) |
99 | { |
100 | dr->api->draw_circle(dr->handle, cx, cy, radius, fillcolour, |
101 | outlinecolour); |
102 | } |
103 | |
104 | void draw_update(drawing *dr, int x, int y, int w, int h) |
105 | { |
106 | if (dr->api->draw_update) |
107 | dr->api->draw_update(dr->handle, x, y, w, h); |
108 | } |
109 | |
110 | void clip(drawing *dr, int x, int y, int w, int h) |
111 | { |
112 | dr->api->clip(dr->handle, x, y, w, h); |
113 | } |
114 | |
115 | void unclip(drawing *dr) |
116 | { |
117 | dr->api->unclip(dr->handle); |
118 | } |
119 | |
120 | void start_draw(drawing *dr) |
121 | { |
122 | dr->api->start_draw(dr->handle); |
123 | } |
124 | |
125 | void end_draw(drawing *dr) |
126 | { |
127 | dr->api->end_draw(dr->handle); |
128 | } |
129 | |
130 | void status_bar(drawing *dr, char *text) |
131 | { |
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132 | char *rewritten; |
133 | |
134 | if (!dr->api->status_bar) |
135 | return; |
136 | |
137 | assert(dr->me); |
138 | |
139 | rewritten = midend_rewrite_statusbar(dr->me, text); |
140 | if (!dr->laststatus || strcmp(rewritten, dr->laststatus)) { |
141 | dr->api->status_bar(dr->handle, rewritten); |
142 | sfree(dr->laststatus); |
143 | dr->laststatus = rewritten; |
144 | } else { |
145 | sfree(rewritten); |
146 | } |
dafd6cf6 |
147 | } |
148 | |
149 | blitter *blitter_new(drawing *dr, int w, int h) |
150 | { |
151 | return dr->api->blitter_new(dr->handle, w, h); |
152 | } |
153 | |
154 | void blitter_free(drawing *dr, blitter *bl) |
155 | { |
156 | dr->api->blitter_free(dr->handle, bl); |
157 | } |
158 | |
159 | void blitter_save(drawing *dr, blitter *bl, int x, int y) |
160 | { |
161 | dr->api->blitter_save(dr->handle, bl, x, y); |
162 | } |
163 | |
164 | void blitter_load(drawing *dr, blitter *bl, int x, int y) |
165 | { |
166 | dr->api->blitter_load(dr->handle, bl, x, y); |
167 | } |
168 | |
169 | void print_begin_doc(drawing *dr, int pages) |
170 | { |
171 | dr->api->begin_doc(dr->handle, pages); |
172 | } |
173 | |
174 | void print_begin_page(drawing *dr, int number) |
175 | { |
176 | dr->api->begin_page(dr->handle, number); |
177 | } |
178 | |
179 | void print_begin_puzzle(drawing *dr, float xm, float xc, |
180 | float ym, float yc, int pw, int ph, float wmm, |
181 | float scale) |
182 | { |
183 | dr->scale = scale; |
184 | dr->ncolours = 0; |
185 | dr->api->begin_puzzle(dr->handle, xm, xc, ym, yc, pw, ph, wmm); |
186 | } |
187 | |
188 | void print_end_puzzle(drawing *dr) |
189 | { |
190 | dr->api->end_puzzle(dr->handle); |
191 | dr->scale = 1.0F; |
192 | } |
193 | |
194 | void print_end_page(drawing *dr, int number) |
195 | { |
196 | dr->api->end_page(dr->handle, number); |
197 | } |
198 | |
199 | void print_end_doc(drawing *dr) |
200 | { |
201 | dr->api->end_doc(dr->handle); |
202 | } |
203 | |
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204 | void print_get_colour(drawing *dr, int colour, int printing_in_colour, |
205 | int *hatch, float *r, float *g, float *b) |
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206 | { |
207 | assert(colour >= 0 && colour < dr->ncolours); |
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208 | if (dr->colours[colour].hatch_when == 2 || |
209 | (dr->colours[colour].hatch_when == 1 && !printing_in_colour)) { |
210 | *hatch = dr->colours[colour].hatch; |
211 | } else { |
212 | *hatch = -1; |
213 | if (printing_in_colour) { |
214 | *r = dr->colours[colour].r; |
215 | *g = dr->colours[colour].g; |
216 | *b = dr->colours[colour].b; |
217 | } else { |
218 | *r = *g = *b = dr->colours[colour].grey; |
219 | } |
220 | } |
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221 | } |
222 | |
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223 | static int print_generic_colour(drawing *dr, float r, float g, float b, |
224 | float grey, int hatch, int hatch_when) |
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225 | { |
226 | if (dr->ncolours >= dr->coloursize) { |
227 | dr->coloursize = dr->ncolours + 16; |
228 | dr->colours = sresize(dr->colours, dr->coloursize, |
229 | struct print_colour); |
230 | } |
231 | dr->colours[dr->ncolours].hatch = hatch; |
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232 | dr->colours[dr->ncolours].hatch_when = hatch_when; |
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233 | dr->colours[dr->ncolours].r = r; |
234 | dr->colours[dr->ncolours].g = g; |
235 | dr->colours[dr->ncolours].b = b; |
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236 | dr->colours[dr->ncolours].grey = grey; |
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237 | return dr->ncolours++; |
238 | } |
239 | |
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240 | int print_mono_colour(drawing *dr, int grey) |
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241 | { |
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242 | return print_generic_colour(dr, grey, grey, grey, grey, -1, 0); |
dafd6cf6 |
243 | } |
244 | |
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245 | int print_grey_colour(drawing *dr, float grey) |
246 | { |
247 | return print_generic_colour(dr, grey, grey, grey, grey, -1, 0); |
248 | } |
249 | |
250 | int print_hatched_colour(drawing *dr, int hatch) |
251 | { |
252 | return print_generic_colour(dr, 0, 0, 0, 0, hatch, 2); |
253 | } |
254 | |
255 | int print_rgb_mono_colour(drawing *dr, float r, float g, float b, int grey) |
256 | { |
257 | return print_generic_colour(dr, r, g, b, grey, -1, 0); |
258 | } |
259 | |
260 | int print_rgb_grey_colour(drawing *dr, float r, float g, float b, float grey) |
261 | { |
262 | return print_generic_colour(dr, r, g, b, grey, -1, 0); |
263 | } |
264 | |
265 | int print_rgb_hatched_colour(drawing *dr, float r, float g, float b, int hatch) |
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266 | { |
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267 | return print_generic_colour(dr, r, g, b, 0, hatch, 1); |
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268 | } |
269 | |
270 | void print_line_width(drawing *dr, int width) |
271 | { |
272 | /* |
273 | * I don't think it's entirely sensible to have line widths be |
274 | * entirely relative to the puzzle size; there is a point |
275 | * beyond which lines are just _stupidly_ thick. On the other |
276 | * hand, absolute line widths aren't particularly nice either |
277 | * because they start to feel a bit feeble at really large |
278 | * scales. |
279 | * |
280 | * My experimental answer is to scale line widths as the |
281 | * _square root_ of the main puzzle scale. Double the puzzle |
282 | * size, and the line width multiplies by 1.4. |
283 | */ |
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284 | dr->api->line_width(dr->handle, (float)sqrt(dr->scale) * width); |
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285 | } |