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1 | /* |
2 | * ps.c: PostScript printing functions. |
3 | */ |
4 | |
5 | #include <stdio.h> |
6 | #include <stdarg.h> |
7 | #include <string.h> |
8 | #include <assert.h> |
9 | |
10 | #include "puzzles.h" |
11 | |
12 | #define ROOT2 1.414213562 |
13 | |
14 | struct psdata { |
15 | FILE *fp; |
16 | int colour; |
17 | int ytop; |
18 | int clipped; |
19 | float hatchthick, hatchspace; |
20 | int gamewidth, gameheight; |
21 | drawing *drawing; |
22 | }; |
23 | |
24 | static void ps_printf(psdata *ps, char *fmt, ...) |
25 | { |
26 | va_list ap; |
27 | |
28 | va_start(ap, fmt); |
29 | vfprintf(ps->fp, fmt, ap); |
30 | va_end(ap); |
31 | } |
32 | |
33 | static void ps_fill(psdata *ps, int colour) |
34 | { |
35 | int hatch; |
36 | float r, g, b; |
37 | |
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38 | print_get_colour(ps->drawing, colour, ps->colour, &hatch, &r, &g, &b); |
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39 | |
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40 | if (hatch < 0) { |
41 | if (ps->colour) |
42 | ps_printf(ps, "%g %g %g setrgbcolor fill\n", r, g, b); |
43 | else |
44 | ps_printf(ps, "%g setgray fill\n", r); |
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45 | } else { |
46 | /* Clip to the region. */ |
47 | ps_printf(ps, "gsave clip\n"); |
48 | /* Hatch the entire game printing area. */ |
49 | ps_printf(ps, "newpath\n"); |
50 | if (hatch == HATCH_VERT || hatch == HATCH_PLUS) |
51 | ps_printf(ps, "0 %g %d {\n" |
52 | " 0 moveto 0 %d rlineto\n" |
53 | "} for\n", ps->hatchspace, ps->gamewidth, |
54 | ps->gameheight); |
55 | if (hatch == HATCH_HORIZ || hatch == HATCH_PLUS) |
56 | ps_printf(ps, "0 %g %d {\n" |
57 | " 0 exch moveto %d 0 rlineto\n" |
58 | "} for\n", ps->hatchspace, ps->gameheight, |
59 | ps->gamewidth); |
60 | if (hatch == HATCH_SLASH || hatch == HATCH_X) |
61 | ps_printf(ps, "%d %g %d {\n" |
62 | " 0 moveto %d dup rlineto\n" |
63 | "} for\n", -ps->gameheight, ps->hatchspace * ROOT2, |
64 | ps->gamewidth, max(ps->gamewidth, ps->gameheight)); |
65 | if (hatch == HATCH_BACKSLASH || hatch == HATCH_X) |
66 | ps_printf(ps, "0 %g %d {\n" |
67 | " 0 moveto %d neg dup neg rlineto\n" |
68 | "} for\n", ps->hatchspace * ROOT2, |
69 | ps->gamewidth+ps->gameheight, |
70 | max(ps->gamewidth, ps->gameheight)); |
71 | ps_printf(ps, "0 setgray %g setlinewidth stroke grestore\n", |
72 | ps->hatchthick); |
73 | } |
74 | } |
75 | |
76 | static void ps_setcolour_internal(psdata *ps, int colour, char *suffix) |
77 | { |
78 | int hatch; |
79 | float r, g, b; |
80 | |
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81 | print_get_colour(ps->drawing, colour, ps->colour, &hatch, &r, &g, &b); |
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82 | |
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83 | /* |
84 | * Stroking in hatched colours is not permitted. |
85 | */ |
86 | assert(hatch < 0); |
87 | |
88 | if (ps->colour) |
89 | ps_printf(ps, "%g %g %g setrgbcolor%s\n", r, g, b, suffix); |
90 | else |
91 | ps_printf(ps, "%g setgray%s\n", r, suffix); |
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92 | } |
93 | |
94 | static void ps_setcolour(psdata *ps, int colour) |
95 | { |
96 | ps_setcolour_internal(ps, colour, ""); |
97 | } |
98 | |
99 | static void ps_stroke(psdata *ps, int colour) |
100 | { |
101 | ps_setcolour_internal(ps, colour, " stroke"); |
102 | } |
103 | |
104 | static void ps_draw_text(void *handle, int x, int y, int fonttype, |
105 | int fontsize, int align, int colour, char *text) |
106 | { |
107 | psdata *ps = (psdata *)handle; |
108 | |
109 | y = ps->ytop - y; |
110 | ps_setcolour(ps, colour); |
111 | ps_printf(ps, "/%s findfont %d scalefont setfont\n", |
112 | fonttype == FONT_FIXED ? "Courier" : "Helvetica", |
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113 | fontsize); |
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114 | if (align & ALIGN_VCENTRE) { |
115 | ps_printf(ps, "newpath 0 0 moveto (X) true charpath flattenpath" |
116 | " pathbbox\n" |
117 | "3 -1 roll add 2 div %d exch sub %d exch moveto pop pop\n", |
118 | y, x); |
119 | } else { |
120 | ps_printf(ps, "%d %d moveto\n", x, y); |
121 | } |
122 | ps_printf(ps, "("); |
123 | while (*text) { |
124 | if (*text == '\\' || *text == '(' || *text == ')') |
125 | ps_printf(ps, "\\"); |
126 | ps_printf(ps, "%c", *text); |
127 | text++; |
128 | } |
129 | ps_printf(ps, ") "); |
130 | if (align & (ALIGN_HCENTRE | ALIGN_HRIGHT)) |
131 | ps_printf(ps, "dup stringwidth pop %sneg 0 rmoveto show\n", |
132 | (align & ALIGN_HCENTRE) ? "2 div " : ""); |
133 | else |
134 | ps_printf(ps, "show\n"); |
135 | } |
136 | |
137 | static void ps_draw_rect(void *handle, int x, int y, int w, int h, int colour) |
138 | { |
139 | psdata *ps = (psdata *)handle; |
140 | |
141 | y = ps->ytop - y; |
142 | /* |
143 | * Offset by half a pixel for the exactness requirement. |
144 | */ |
145 | ps_printf(ps, "newpath %g %g moveto %d 0 rlineto 0 %d rlineto" |
146 | " %d 0 rlineto closepath\n", x - 0.5, y + 0.5, w, -h, -w); |
147 | ps_fill(ps, colour); |
148 | } |
149 | |
150 | static void ps_draw_line(void *handle, int x1, int y1, int x2, int y2, |
151 | int colour) |
152 | { |
153 | psdata *ps = (psdata *)handle; |
154 | |
155 | y1 = ps->ytop - y1; |
156 | y2 = ps->ytop - y2; |
157 | ps_printf(ps, "newpath %d %d moveto %d %d lineto\n", x1, y1, x2, y2); |
158 | ps_stroke(ps, colour); |
159 | } |
160 | |
161 | static void ps_draw_polygon(void *handle, int *coords, int npoints, |
162 | int fillcolour, int outlinecolour) |
163 | { |
164 | psdata *ps = (psdata *)handle; |
165 | |
166 | int i; |
167 | |
168 | ps_printf(ps, "newpath %d %d moveto\n", coords[0], ps->ytop - coords[1]); |
169 | |
170 | for (i = 1; i < npoints; i++) |
171 | ps_printf(ps, "%d %d lineto\n", coords[i*2], ps->ytop - coords[i*2+1]); |
172 | |
173 | ps_printf(ps, "closepath\n"); |
174 | |
175 | if (fillcolour >= 0) { |
176 | ps_printf(ps, "gsave\n"); |
177 | ps_fill(ps, fillcolour); |
178 | ps_printf(ps, "grestore\n"); |
179 | } |
180 | ps_stroke(ps, outlinecolour); |
181 | } |
182 | |
183 | static void ps_draw_circle(void *handle, int cx, int cy, int radius, |
184 | int fillcolour, int outlinecolour) |
185 | { |
186 | psdata *ps = (psdata *)handle; |
187 | |
188 | cy = ps->ytop - cy; |
189 | |
190 | ps_printf(ps, "newpath %d %d %d 0 360 arc closepath\n", cx, cy, radius); |
191 | |
192 | if (fillcolour >= 0) { |
193 | ps_printf(ps, "gsave\n"); |
194 | ps_fill(ps, fillcolour); |
195 | ps_printf(ps, "grestore\n"); |
196 | } |
197 | ps_stroke(ps, outlinecolour); |
198 | } |
199 | |
200 | static void ps_unclip(void *handle) |
201 | { |
202 | psdata *ps = (psdata *)handle; |
203 | |
204 | assert(ps->clipped); |
205 | ps_printf(ps, "grestore\n"); |
206 | ps->clipped = FALSE; |
207 | } |
208 | |
209 | static void ps_clip(void *handle, int x, int y, int w, int h) |
210 | { |
211 | psdata *ps = (psdata *)handle; |
212 | |
213 | if (ps->clipped) |
214 | ps_unclip(ps); |
215 | |
216 | y = ps->ytop - y; |
217 | /* |
218 | * Offset by half a pixel for the exactness requirement. |
219 | */ |
220 | ps_printf(ps, "gsave\n"); |
221 | ps_printf(ps, "newpath %g %g moveto %d 0 rlineto 0 %d rlineto" |
222 | " %d 0 rlineto closepath\n", x - 0.5, y + 0.5, w, -h, -w); |
223 | ps_printf(ps, "clip\n"); |
224 | ps->clipped = TRUE; |
225 | } |
226 | |
227 | static void ps_line_width(void *handle, float width) |
228 | { |
229 | psdata *ps = (psdata *)handle; |
230 | |
231 | ps_printf(ps, "%g setlinewidth\n", width); |
232 | } |
233 | |
234 | static void ps_begin_doc(void *handle, int pages) |
235 | { |
236 | psdata *ps = (psdata *)handle; |
237 | |
238 | fputs("%!PS-Adobe-3.0\n", ps->fp); |
239 | fputs("%%Creator: Simon Tatham's Portable Puzzle Collection\n", ps->fp); |
240 | fputs("%%DocumentData: Clean7Bit\n", ps->fp); |
241 | fputs("%%LanguageLevel: 1\n", ps->fp); |
242 | fprintf(ps->fp, "%%%%Pages: %d\n", pages); |
243 | fputs("%%DocumentNeededResources:\n", ps->fp); |
244 | fputs("%%+ font Helvetica\n", ps->fp); |
245 | fputs("%%+ font Courier\n", ps->fp); |
246 | fputs("%%EndComments\n", ps->fp); |
247 | fputs("%%BeginSetup\n", ps->fp); |
248 | fputs("%%IncludeResource: font Helvetica\n", ps->fp); |
249 | fputs("%%IncludeResource: font Courier\n", ps->fp); |
250 | fputs("%%EndSetup\n", ps->fp); |
251 | } |
252 | |
253 | static void ps_begin_page(void *handle, int number) |
254 | { |
255 | psdata *ps = (psdata *)handle; |
256 | |
257 | fprintf(ps->fp, "%%%%Page: %d %d\ngsave save\n%g dup scale\n", |
258 | number, number, 72.0 / 25.4); |
259 | } |
260 | |
261 | static void ps_begin_puzzle(void *handle, float xm, float xc, |
262 | float ym, float yc, int pw, int ph, float wmm) |
263 | { |
264 | psdata *ps = (psdata *)handle; |
265 | |
266 | fprintf(ps->fp, "gsave\n" |
267 | "clippath flattenpath pathbbox pop pop translate\n" |
268 | "clippath flattenpath pathbbox 4 2 roll pop pop\n" |
269 | "exch %g mul %g add exch dup %g mul %g add sub translate\n" |
270 | "%g dup scale\n" |
271 | "0 -%d translate\n", xm, xc, ym, yc, wmm/pw, ph); |
272 | ps->ytop = ph; |
273 | ps->clipped = FALSE; |
274 | ps->gamewidth = pw; |
275 | ps->gameheight = ph; |
276 | ps->hatchthick = 0.2 * pw / wmm; |
277 | ps->hatchspace = 1.0 * pw / wmm; |
278 | } |
279 | |
280 | static void ps_end_puzzle(void *handle) |
281 | { |
282 | psdata *ps = (psdata *)handle; |
283 | |
284 | fputs("grestore\n", ps->fp); |
285 | } |
286 | |
287 | static void ps_end_page(void *handle, int number) |
288 | { |
289 | psdata *ps = (psdata *)handle; |
290 | |
291 | fputs("restore grestore showpage\n", ps->fp); |
292 | } |
293 | |
294 | static void ps_end_doc(void *handle) |
295 | { |
296 | psdata *ps = (psdata *)handle; |
297 | |
298 | fputs("%%EOF\n", ps->fp); |
299 | } |
300 | |
301 | static const struct drawing_api ps_drawing = { |
302 | ps_draw_text, |
303 | ps_draw_rect, |
304 | ps_draw_line, |
305 | ps_draw_polygon, |
306 | ps_draw_circle, |
307 | NULL /* draw_update */, |
308 | ps_clip, |
309 | ps_unclip, |
310 | NULL /* start_draw */, |
311 | NULL /* end_draw */, |
312 | NULL /* status_bar */, |
313 | NULL /* blitter_new */, |
314 | NULL /* blitter_free */, |
315 | NULL /* blitter_save */, |
316 | NULL /* blitter_load */, |
317 | ps_begin_doc, |
318 | ps_begin_page, |
319 | ps_begin_puzzle, |
320 | ps_end_puzzle, |
321 | ps_end_page, |
322 | ps_end_doc, |
323 | ps_line_width, |
324 | }; |
325 | |
326 | psdata *ps_init(FILE *outfile, int colour) |
327 | { |
328 | psdata *ps = snew(psdata); |
329 | |
330 | ps->fp = outfile; |
331 | ps->colour = colour; |
332 | ps->ytop = 0; |
333 | ps->clipped = FALSE; |
334 | ps->hatchthick = ps->hatchspace = ps->gamewidth = ps->gameheight = 0; |
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335 | ps->drawing = drawing_new(&ps_drawing, NULL, ps); |
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336 | |
337 | return ps; |
338 | } |
339 | |
340 | void ps_free(psdata *ps) |
341 | { |
342 | drawing_free(ps->drawing); |
343 | sfree(ps); |
344 | } |
345 | |
346 | drawing *ps_drawing_api(psdata *ps) |
347 | { |
348 | return ps->drawing; |
349 | } |