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 | * |
10 | * FIXME: could we also sort out rewrite_statusbar in here? Also |
11 | * I'd _like_ to do automatic draw_updates, but it's a pain for |
12 | * draw_text in particular - I could invent a front end API which |
13 | * retrieved the text bounds and then do the alignment myself as |
14 | * well, except that that doesn't work for PS. As usual. |
15 | */ |
16 | |
17 | #include <stdio.h> |
18 | #include <stdlib.h> |
19 | #include <assert.h> |
20 | #include <math.h> |
21 | |
22 | #include "puzzles.h" |
23 | |
24 | struct print_colour { |
25 | int hatch; |
26 | float r, g, b; |
27 | }; |
28 | |
29 | struct drawing { |
30 | const drawing_api *api; |
31 | void *handle; |
32 | struct print_colour *colours; |
33 | int ncolours, coloursize; |
34 | float scale; |
35 | }; |
36 | |
37 | drawing *drawing_init(const drawing_api *api, void *handle) |
38 | { |
39 | drawing *dr = snew(drawing); |
40 | dr->api = api; |
41 | dr->handle = handle; |
42 | dr->colours = NULL; |
43 | dr->ncolours = dr->coloursize = 0; |
44 | dr->scale = 1.0F; |
45 | return dr; |
46 | } |
47 | |
48 | void drawing_free(drawing *dr) |
49 | { |
50 | sfree(dr->colours); |
51 | sfree(dr); |
52 | } |
53 | |
54 | void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize, |
55 | int align, int colour, char *text) |
56 | { |
57 | dr->api->draw_text(dr->handle, x, y, fonttype, fontsize, align, |
58 | colour, text); |
59 | } |
60 | |
61 | void draw_rect(drawing *dr, int x, int y, int w, int h, int colour) |
62 | { |
63 | dr->api->draw_rect(dr->handle, x, y, w, h, colour); |
64 | } |
65 | |
66 | void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour) |
67 | { |
68 | dr->api->draw_line(dr->handle, x1, y1, x2, y2, colour); |
69 | } |
70 | |
71 | void draw_polygon(drawing *dr, int *coords, int npoints, |
72 | int fillcolour, int outlinecolour) |
73 | { |
74 | dr->api->draw_polygon(dr->handle, coords, npoints, fillcolour, |
75 | outlinecolour); |
76 | } |
77 | |
78 | void draw_circle(drawing *dr, int cx, int cy, int radius, |
79 | int fillcolour, int outlinecolour) |
80 | { |
81 | dr->api->draw_circle(dr->handle, cx, cy, radius, fillcolour, |
82 | outlinecolour); |
83 | } |
84 | |
85 | void draw_update(drawing *dr, int x, int y, int w, int h) |
86 | { |
87 | if (dr->api->draw_update) |
88 | dr->api->draw_update(dr->handle, x, y, w, h); |
89 | } |
90 | |
91 | void clip(drawing *dr, int x, int y, int w, int h) |
92 | { |
93 | dr->api->clip(dr->handle, x, y, w, h); |
94 | } |
95 | |
96 | void unclip(drawing *dr) |
97 | { |
98 | dr->api->unclip(dr->handle); |
99 | } |
100 | |
101 | void start_draw(drawing *dr) |
102 | { |
103 | dr->api->start_draw(dr->handle); |
104 | } |
105 | |
106 | void end_draw(drawing *dr) |
107 | { |
108 | dr->api->end_draw(dr->handle); |
109 | } |
110 | |
111 | void status_bar(drawing *dr, char *text) |
112 | { |
113 | if (dr->api->status_bar) |
114 | dr->api->status_bar(dr->handle, text); |
115 | } |
116 | |
117 | blitter *blitter_new(drawing *dr, int w, int h) |
118 | { |
119 | return dr->api->blitter_new(dr->handle, w, h); |
120 | } |
121 | |
122 | void blitter_free(drawing *dr, blitter *bl) |
123 | { |
124 | dr->api->blitter_free(dr->handle, bl); |
125 | } |
126 | |
127 | void blitter_save(drawing *dr, blitter *bl, int x, int y) |
128 | { |
129 | dr->api->blitter_save(dr->handle, bl, x, y); |
130 | } |
131 | |
132 | void blitter_load(drawing *dr, blitter *bl, int x, int y) |
133 | { |
134 | dr->api->blitter_load(dr->handle, bl, x, y); |
135 | } |
136 | |
137 | void print_begin_doc(drawing *dr, int pages) |
138 | { |
139 | dr->api->begin_doc(dr->handle, pages); |
140 | } |
141 | |
142 | void print_begin_page(drawing *dr, int number) |
143 | { |
144 | dr->api->begin_page(dr->handle, number); |
145 | } |
146 | |
147 | void print_begin_puzzle(drawing *dr, float xm, float xc, |
148 | float ym, float yc, int pw, int ph, float wmm, |
149 | float scale) |
150 | { |
151 | dr->scale = scale; |
152 | dr->ncolours = 0; |
153 | dr->api->begin_puzzle(dr->handle, xm, xc, ym, yc, pw, ph, wmm); |
154 | } |
155 | |
156 | void print_end_puzzle(drawing *dr) |
157 | { |
158 | dr->api->end_puzzle(dr->handle); |
159 | dr->scale = 1.0F; |
160 | } |
161 | |
162 | void print_end_page(drawing *dr, int number) |
163 | { |
164 | dr->api->end_page(dr->handle, number); |
165 | } |
166 | |
167 | void print_end_doc(drawing *dr) |
168 | { |
169 | dr->api->end_doc(dr->handle); |
170 | } |
171 | |
172 | void print_get_colour(drawing *dr, int colour, int *hatch, |
173 | float *r, float *g, float *b) |
174 | { |
175 | assert(colour >= 0 && colour < dr->ncolours); |
176 | *hatch = dr->colours[colour].hatch; |
177 | *r = dr->colours[colour].r; |
178 | *g = dr->colours[colour].g; |
179 | *b = dr->colours[colour].b; |
180 | } |
181 | |
182 | int print_rgb_colour(drawing *dr, int hatch, float r, float g, float b) |
183 | { |
184 | if (dr->ncolours >= dr->coloursize) { |
185 | dr->coloursize = dr->ncolours + 16; |
186 | dr->colours = sresize(dr->colours, dr->coloursize, |
187 | struct print_colour); |
188 | } |
189 | dr->colours[dr->ncolours].hatch = hatch; |
190 | dr->colours[dr->ncolours].r = r; |
191 | dr->colours[dr->ncolours].g = g; |
192 | dr->colours[dr->ncolours].b = b; |
193 | return dr->ncolours++; |
194 | } |
195 | |
196 | int print_grey_colour(drawing *dr, int hatch, float grey) |
197 | { |
198 | return print_rgb_colour(dr, hatch, grey, grey, grey); |
199 | } |
200 | |
201 | int print_mono_colour(drawing *dr, int grey) |
202 | { |
203 | return print_rgb_colour(dr, grey ? HATCH_CLEAR : HATCH_SOLID, |
204 | grey, grey, grey); |
205 | } |
206 | |
207 | void print_line_width(drawing *dr, int width) |
208 | { |
209 | /* |
210 | * I don't think it's entirely sensible to have line widths be |
211 | * entirely relative to the puzzle size; there is a point |
212 | * beyond which lines are just _stupidly_ thick. On the other |
213 | * hand, absolute line widths aren't particularly nice either |
214 | * because they start to feel a bit feeble at really large |
215 | * scales. |
216 | * |
217 | * My experimental answer is to scale line widths as the |
218 | * _square root_ of the main puzzle scale. Double the puzzle |
219 | * size, and the line width multiplies by 1.4. |
220 | */ |
221 | dr->api->line_width(dr->handle, sqrt(dr->scale) * width); |
222 | } |