1 /*
2 * Copyright (C) 2016 Robin Gareus <robin@gareus.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2, or (at your option)
7 * any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include <stdio.h>
19 #include <math.h>
20 #include <cairo/cairo.h>
21 #include <pango/pango.h>
22 #include <pango/pangocairo.h>
23
draw_text(cairo_t * cr,PangoLayout * pl,const char * txt)24 static void draw_text (cairo_t* cr, PangoLayout* pl, const char* txt) {
25 int tw, th;
26 cairo_save (cr);
27 cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 1.0);
28 pango_layout_set_text (pl, txt, -1);
29 // rotate 90deg ? maybe
30 pango_layout_get_pixel_size (pl, &tw, &th);
31 cairo_translate (cr, -tw / 2.0, -th / 2.0);
32 pango_cairo_layout_path (cr, pl);
33 cairo_fill (cr);
34 cairo_restore (cr);
35 }
36
draw_swinger(cairo_t * cr,int w,int h,int n_steps)37 static void draw_swinger (cairo_t* cr, int w, int h, int n_steps) {
38 int i;
39
40 PangoLayout* pl = pango_cairo_create_layout (cr);
41 PangoFontDescription *desc = pango_font_description_from_string ("Sans 14px"); // XXX use MOD font
42 pango_layout_set_font_description (pl, desc);
43 pango_font_description_free (desc);
44
45 cairo_pattern_t* pat = cairo_pattern_create_linear (0.0, 0.0, 3.0, h);
46 #if 0
47 cairo_pattern_add_color_stop_rgba (pat, 0.00, 1.0, 0.0, 0.0, 1.0);
48 cairo_pattern_add_color_stop_rgba (pat, 0.33, 1.0, 0.6, 0.2, 1.0);
49 cairo_pattern_add_color_stop_rgba (pat, 0.60, 0.0, 1.0, 0.0, 1.0);
50 cairo_pattern_add_color_stop_rgba (pat, 1.00, 0.0, 0.0, 1.0, 1.0);
51 #else
52 cairo_pattern_add_color_stop_rgba (pat, 0.00, 1.0, 0.6, 0.2, 1.0);
53 cairo_pattern_add_color_stop_rgba (pat, 0.33, 1.0, 0.6, 0.2, 1.0);
54 cairo_pattern_add_color_stop_rgba (pat, 1.00, 0.5, 0.3, 0.1, 1.0);
55 #endif
56
57 const int nsm1 = n_steps - 1;
58 for (i = 0; i < n_steps; ++i) {
59 cairo_save (cr);
60 cairo_translate (cr, i * w, 0);
61 cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 1.0);
62 cairo_rectangle (cr, 0, 0, w, h);
63 cairo_fill (cr);
64
65 float vh = h * i / (n_steps - 1.f);
66 cairo_rectangle (cr, 0, h - vh, w, vh);
67 cairo_set_source (cr, pat);
68 cairo_fill (cr);
69
70 cairo_translate (cr, w * .5, h * .5);
71 if (i == 0) {
72 draw_text (cr, pl, "1:1");
73 }
74 if ( 6 * nsm1 == 15 * i) {
75 draw_text (cr, pl, "3:2");
76 }
77 if ( 10 * nsm1 == 15 * i) {
78 draw_text (cr, pl, "2:1");
79 }
80 if ( 15 * nsm1 == 15 * i) {
81 draw_text (cr, pl, "3:1");
82 }
83
84 cairo_restore (cr);
85 }
86
87 g_object_unref (pl);
88
89 }
90
main(int argc,char ** argv)91 int main (int argc, char **argv) {
92 int w = 30;
93 int h = 42;
94 /* need to be able to represent
95 * 0, 0.2, 1/3 and 0.5
96 * common denominator 30:
97 * 0, 6, 10, 15
98 */
99 int n_steps = 31;
100
101 cairo_surface_t* cs = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, n_steps * w, h);
102 cairo_t* cr = cairo_create (cs);
103
104 draw_swinger (cr, w, h, n_steps);
105
106 cairo_surface_write_to_png (cs, "../modgui/swinger.png");
107 cairo_destroy (cr);
108 cairo_surface_destroy (cs);
109 return 0;
110 }
111
