| /* 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; |
| } |