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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 | * |
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. |
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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; |
36 | float r, g, b; |
37 | }; |
38 | |
39 | struct drawing { |
40 | const drawing_api *api; |
41 | void *handle; |
42 | struct print_colour *colours; |
43 | int ncolours, coloursize; |
44 | float scale; |
83c0438f |
45 | /* `me' is only used in status_bar(), so print-oriented instances of |
46 | * this may set it to NULL. */ |
47 | midend *me; |
48 | char *laststatus; |
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49 | }; |
50 | |
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51 | drawing *drawing_new(const drawing_api *api, midend *me, void *handle) |
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52 | { |
53 | drawing *dr = snew(drawing); |
54 | dr->api = api; |
55 | dr->handle = handle; |
56 | dr->colours = NULL; |
57 | dr->ncolours = dr->coloursize = 0; |
58 | dr->scale = 1.0F; |
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59 | dr->me = me; |
60 | dr->laststatus = NULL; |
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61 | return dr; |
62 | } |
63 | |
64 | void drawing_free(drawing *dr) |
65 | { |
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66 | sfree(dr->laststatus); |
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67 | sfree(dr->colours); |
68 | sfree(dr); |
69 | } |
70 | |
71 | void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize, |
72 | int align, int colour, char *text) |
73 | { |
74 | dr->api->draw_text(dr->handle, x, y, fonttype, fontsize, align, |
75 | colour, text); |
76 | } |
77 | |
78 | void draw_rect(drawing *dr, int x, int y, int w, int h, int colour) |
79 | { |
80 | dr->api->draw_rect(dr->handle, x, y, w, h, colour); |
81 | } |
82 | |
83 | void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour) |
84 | { |
85 | dr->api->draw_line(dr->handle, x1, y1, x2, y2, colour); |
86 | } |
87 | |
88 | void draw_polygon(drawing *dr, int *coords, int npoints, |
89 | int fillcolour, int outlinecolour) |
90 | { |
91 | dr->api->draw_polygon(dr->handle, coords, npoints, fillcolour, |
92 | outlinecolour); |
93 | } |
94 | |
95 | void draw_circle(drawing *dr, int cx, int cy, int radius, |
96 | int fillcolour, int outlinecolour) |
97 | { |
98 | dr->api->draw_circle(dr->handle, cx, cy, radius, fillcolour, |
99 | outlinecolour); |
100 | } |
101 | |
102 | void draw_update(drawing *dr, int x, int y, int w, int h) |
103 | { |
104 | if (dr->api->draw_update) |
105 | dr->api->draw_update(dr->handle, x, y, w, h); |
106 | } |
107 | |
108 | void clip(drawing *dr, int x, int y, int w, int h) |
109 | { |
110 | dr->api->clip(dr->handle, x, y, w, h); |
111 | } |
112 | |
113 | void unclip(drawing *dr) |
114 | { |
115 | dr->api->unclip(dr->handle); |
116 | } |
117 | |
118 | void start_draw(drawing *dr) |
119 | { |
120 | dr->api->start_draw(dr->handle); |
121 | } |
122 | |
123 | void end_draw(drawing *dr) |
124 | { |
125 | dr->api->end_draw(dr->handle); |
126 | } |
127 | |
128 | void status_bar(drawing *dr, char *text) |
129 | { |
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130 | char *rewritten; |
131 | |
132 | if (!dr->api->status_bar) |
133 | return; |
134 | |
135 | assert(dr->me); |
136 | |
137 | rewritten = midend_rewrite_statusbar(dr->me, text); |
138 | if (!dr->laststatus || strcmp(rewritten, dr->laststatus)) { |
139 | dr->api->status_bar(dr->handle, rewritten); |
140 | sfree(dr->laststatus); |
141 | dr->laststatus = rewritten; |
142 | } else { |
143 | sfree(rewritten); |
144 | } |
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145 | } |
146 | |
147 | blitter *blitter_new(drawing *dr, int w, int h) |
148 | { |
149 | return dr->api->blitter_new(dr->handle, w, h); |
150 | } |
151 | |
152 | void blitter_free(drawing *dr, blitter *bl) |
153 | { |
154 | dr->api->blitter_free(dr->handle, bl); |
155 | } |
156 | |
157 | void blitter_save(drawing *dr, blitter *bl, int x, int y) |
158 | { |
159 | dr->api->blitter_save(dr->handle, bl, x, y); |
160 | } |
161 | |
162 | void blitter_load(drawing *dr, blitter *bl, int x, int y) |
163 | { |
164 | dr->api->blitter_load(dr->handle, bl, x, y); |
165 | } |
166 | |
167 | void print_begin_doc(drawing *dr, int pages) |
168 | { |
169 | dr->api->begin_doc(dr->handle, pages); |
170 | } |
171 | |
172 | void print_begin_page(drawing *dr, int number) |
173 | { |
174 | dr->api->begin_page(dr->handle, number); |
175 | } |
176 | |
177 | void print_begin_puzzle(drawing *dr, float xm, float xc, |
178 | float ym, float yc, int pw, int ph, float wmm, |
179 | float scale) |
180 | { |
181 | dr->scale = scale; |
182 | dr->ncolours = 0; |
183 | dr->api->begin_puzzle(dr->handle, xm, xc, ym, yc, pw, ph, wmm); |
184 | } |
185 | |
186 | void print_end_puzzle(drawing *dr) |
187 | { |
188 | dr->api->end_puzzle(dr->handle); |
189 | dr->scale = 1.0F; |
190 | } |
191 | |
192 | void print_end_page(drawing *dr, int number) |
193 | { |
194 | dr->api->end_page(dr->handle, number); |
195 | } |
196 | |
197 | void print_end_doc(drawing *dr) |
198 | { |
199 | dr->api->end_doc(dr->handle); |
200 | } |
201 | |
202 | void print_get_colour(drawing *dr, int colour, int *hatch, |
203 | float *r, float *g, float *b) |
204 | { |
205 | assert(colour >= 0 && colour < dr->ncolours); |
206 | *hatch = dr->colours[colour].hatch; |
207 | *r = dr->colours[colour].r; |
208 | *g = dr->colours[colour].g; |
209 | *b = dr->colours[colour].b; |
210 | } |
211 | |
212 | int print_rgb_colour(drawing *dr, int hatch, float r, float g, float b) |
213 | { |
214 | if (dr->ncolours >= dr->coloursize) { |
215 | dr->coloursize = dr->ncolours + 16; |
216 | dr->colours = sresize(dr->colours, dr->coloursize, |
217 | struct print_colour); |
218 | } |
219 | dr->colours[dr->ncolours].hatch = hatch; |
220 | dr->colours[dr->ncolours].r = r; |
221 | dr->colours[dr->ncolours].g = g; |
222 | dr->colours[dr->ncolours].b = b; |
223 | return dr->ncolours++; |
224 | } |
225 | |
226 | int print_grey_colour(drawing *dr, int hatch, float grey) |
227 | { |
228 | return print_rgb_colour(dr, hatch, grey, grey, grey); |
229 | } |
230 | |
231 | int print_mono_colour(drawing *dr, int grey) |
232 | { |
233 | return print_rgb_colour(dr, grey ? HATCH_CLEAR : HATCH_SOLID, |
234 | grey, grey, grey); |
235 | } |
236 | |
237 | void print_line_width(drawing *dr, int width) |
238 | { |
239 | /* |
240 | * I don't think it's entirely sensible to have line widths be |
241 | * entirely relative to the puzzle size; there is a point |
242 | * beyond which lines are just _stupidly_ thick. On the other |
243 | * hand, absolute line widths aren't particularly nice either |
244 | * because they start to feel a bit feeble at really large |
245 | * scales. |
246 | * |
247 | * My experimental answer is to scale line widths as the |
248 | * _square root_ of the main puzzle scale. Double the puzzle |
249 | * size, and the line width multiplies by 1.4. |
250 | */ |
251 | dr->api->line_width(dr->handle, sqrt(dr->scale) * width); |
252 | } |