2 * drawing.c: Intermediary between the drawing interface as
3 * presented to the back end, and that implemented by the front
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.
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.
36 int hatch_when; /* 0=never 1=only-in-b&w 2=always */
42 const drawing_api *api;
44 struct print_colour *colours;
45 int ncolours, coloursize;
47 /* `me' is only used in status_bar(), so print-oriented instances of
48 * this may set it to NULL. */
53 drawing *drawing_new(const drawing_api *api, midend *me, void *handle)
55 drawing *dr = snew(drawing);
59 dr->ncolours = dr->coloursize = 0;
62 dr->laststatus = NULL;
66 void drawing_free(drawing *dr)
68 sfree(dr->laststatus);
73 void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize,
74 int align, int colour, const char *text)
76 dr->api->draw_text(dr->handle, x, y, fonttype, fontsize, align,
80 void draw_rect(drawing *dr, int x, int y, int w, int h, int colour)
82 dr->api->draw_rect(dr->handle, x, y, w, h, colour);
85 void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour)
87 dr->api->draw_line(dr->handle, x1, y1, x2, y2, colour);
90 void draw_thick_line(drawing *dr, float thickness,
91 float x1, float y1, float x2, float y2, int colour)
95 if (dr->api->draw_thick_line) {
96 dr->api->draw_thick_line(dr->handle, thickness,
97 x1, y1, x2, y2, colour);
99 /* We'll fake it up with a filled polygon. The tweak to the
100 * thickness empirically compensates for rounding errors, because
101 * polygon rendering uses integer coordinates.
103 float len = sqrt((x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1));
104 float tvhatx = (x2 - x1)/len * (thickness/2 - 0.2);
105 float tvhaty = (y2 - y1)/len * (thickness/2 - 0.2);
116 dr->api->draw_polygon(dr->handle, p, 4, colour, colour);
120 void draw_polygon(drawing *dr, int *coords, int npoints,
121 int fillcolour, int outlinecolour)
123 dr->api->draw_polygon(dr->handle, coords, npoints, fillcolour,
127 void draw_circle(drawing *dr, int cx, int cy, int radius,
128 int fillcolour, int outlinecolour)
130 dr->api->draw_circle(dr->handle, cx, cy, radius, fillcolour,
134 void draw_update(drawing *dr, int x, int y, int w, int h)
136 if (dr->api->draw_update)
137 dr->api->draw_update(dr->handle, x, y, w, h);
140 void clip(drawing *dr, int x, int y, int w, int h)
142 dr->api->clip(dr->handle, x, y, w, h);
145 void unclip(drawing *dr)
147 dr->api->unclip(dr->handle);
150 void start_draw(drawing *dr)
152 dr->api->start_draw(dr->handle);
155 void end_draw(drawing *dr)
157 dr->api->end_draw(dr->handle);
160 char *text_fallback(drawing *dr, const char *const *strings, int nstrings)
165 * If the drawing implementation provides one of these, use it.
167 if (dr && dr->api->text_fallback)
168 return dr->api->text_fallback(dr->handle, strings, nstrings);
171 * Otherwise, do the simple thing and just pick the first string
172 * that fits in plain ASCII. It will then need no translation
175 for (i = 0; i < nstrings; i++) {
178 for (p = strings[i]; *p; p++)
182 return dupstr(strings[i]);
186 * The caller was responsible for making sure _some_ string in
187 * the list was in plain ASCII.
189 assert(!"Should never get here");
190 return NULL; /* placate optimiser */
193 void status_bar(drawing *dr, const char *text)
197 if (!dr->api->status_bar)
202 rewritten = midend_rewrite_statusbar(dr->me, text);
203 if (!dr->laststatus || strcmp(rewritten, dr->laststatus)) {
204 dr->api->status_bar(dr->handle, rewritten);
205 sfree(dr->laststatus);
206 dr->laststatus = rewritten;
212 blitter *blitter_new(drawing *dr, int w, int h)
214 return dr->api->blitter_new(dr->handle, w, h);
217 void blitter_free(drawing *dr, blitter *bl)
219 dr->api->blitter_free(dr->handle, bl);
222 void blitter_save(drawing *dr, blitter *bl, int x, int y)
224 dr->api->blitter_save(dr->handle, bl, x, y);
227 void blitter_load(drawing *dr, blitter *bl, int x, int y)
229 dr->api->blitter_load(dr->handle, bl, x, y);
232 void print_begin_doc(drawing *dr, int pages)
234 dr->api->begin_doc(dr->handle, pages);
237 void print_begin_page(drawing *dr, int number)
239 dr->api->begin_page(dr->handle, number);
242 void print_begin_puzzle(drawing *dr, float xm, float xc,
243 float ym, float yc, int pw, int ph, float wmm,
248 dr->api->begin_puzzle(dr->handle, xm, xc, ym, yc, pw, ph, wmm);
251 void print_end_puzzle(drawing *dr)
253 dr->api->end_puzzle(dr->handle);
257 void print_end_page(drawing *dr, int number)
259 dr->api->end_page(dr->handle, number);
262 void print_end_doc(drawing *dr)
264 dr->api->end_doc(dr->handle);
267 void print_get_colour(drawing *dr, int colour, int printing_in_colour,
268 int *hatch, float *r, float *g, float *b)
270 assert(colour >= 0 && colour < dr->ncolours);
271 if (dr->colours[colour].hatch_when == 2 ||
272 (dr->colours[colour].hatch_when == 1 && !printing_in_colour)) {
273 *hatch = dr->colours[colour].hatch;
276 if (printing_in_colour) {
277 *r = dr->colours[colour].r;
278 *g = dr->colours[colour].g;
279 *b = dr->colours[colour].b;
281 *r = *g = *b = dr->colours[colour].grey;
286 static int print_generic_colour(drawing *dr, float r, float g, float b,
287 float grey, int hatch, int hatch_when)
289 if (dr->ncolours >= dr->coloursize) {
290 dr->coloursize = dr->ncolours + 16;
291 dr->colours = sresize(dr->colours, dr->coloursize,
292 struct print_colour);
294 dr->colours[dr->ncolours].hatch = hatch;
295 dr->colours[dr->ncolours].hatch_when = hatch_when;
296 dr->colours[dr->ncolours].r = r;
297 dr->colours[dr->ncolours].g = g;
298 dr->colours[dr->ncolours].b = b;
299 dr->colours[dr->ncolours].grey = grey;
300 return dr->ncolours++;
303 int print_mono_colour(drawing *dr, int grey)
305 return print_generic_colour(dr, grey, grey, grey, grey, -1, 0);
308 int print_grey_colour(drawing *dr, float grey)
310 return print_generic_colour(dr, grey, grey, grey, grey, -1, 0);
313 int print_hatched_colour(drawing *dr, int hatch)
315 return print_generic_colour(dr, 0, 0, 0, 0, hatch, 2);
318 int print_rgb_mono_colour(drawing *dr, float r, float g, float b, int grey)
320 return print_generic_colour(dr, r, g, b, grey, -1, 0);
323 int print_rgb_grey_colour(drawing *dr, float r, float g, float b, float grey)
325 return print_generic_colour(dr, r, g, b, grey, -1, 0);
328 int print_rgb_hatched_colour(drawing *dr, float r, float g, float b, int hatch)
330 return print_generic_colour(dr, r, g, b, 0, hatch, 1);
333 void print_line_width(drawing *dr, int width)
336 * I don't think it's entirely sensible to have line widths be
337 * entirely relative to the puzzle size; there is a point
338 * beyond which lines are just _stupidly_ thick. On the other
339 * hand, absolute line widths aren't particularly nice either
340 * because they start to feel a bit feeble at really large
343 * My experimental answer is to scale line widths as the
344 * _square root_ of the main puzzle scale. Double the puzzle
345 * size, and the line width multiplies by 1.4.
347 dr->api->line_width(dr->handle, (float)sqrt(dr->scale) * width);
350 void print_line_dotted(drawing *dr, int dotted)
352 dr->api->line_dotted(dr->handle, dotted);