1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
/* Taken from http://cairographics.org/samples/ */
#include <cairo.h>
#include <math.h>
#include <stdio.h>
int main(int argc, char *argv[])
{
char *filename;
if (argc != 2)
{
fprintf (stderr, "Usage: %s OUTPUT_FILENAME\n", argv[0]);
return 1;
}
filename = argv[1];
double xc = 128.0;
double yc = 128.0;
double radius = 100.0;
double angle1 = 45.0 * (M_PI/180.0); /* angles are specified */
double angle2 = 180.0 * (M_PI/180.0); /* in radians */
cairo_surface_t *im = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, xc * 2, yc * 2);
cairo_t *cr = cairo_create(im);
cairo_set_line_width (cr, 10.0);
cairo_arc (cr, xc, yc, radius, angle1, angle2);
cairo_stroke (cr);
/* draw helping lines */
cairo_set_source_rgba (cr, 1, 0.2, 0.2, 0.6);
cairo_set_line_width (cr, 6.0);
cairo_arc (cr, xc, yc, 10.0, 0, 2*M_PI);
cairo_fill (cr);
cairo_arc (cr, xc, yc, radius, angle1, angle1);
cairo_line_to (cr, xc, yc);
cairo_arc (cr, xc, yc, radius, angle2, angle2);
cairo_line_to (cr, xc, yc);
cairo_stroke (cr);
cairo_status_t status = cairo_surface_write_to_png (im, filename);
cairo_surface_destroy (im);
if (status != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "Could not save png to '%s'\n", filename);
}
cairo_destroy(cr);
return 0;
}
|
