#include <cairo.h>
#include <math.h> /* M_PI */

static void
draw (cairo_t *cr, int width, int height)
{
    cairo_pattern_t *pattern;

    cairo_scale (cr, width, height);

    pattern = cairo_pattern_create_radial (0.55, 0.55, 0.25,
					   0.5, 1.0, 0.525);
    cairo_pattern_add_color_stop_rgba (pattern, 0.0,
				       0.0, 0.0, 1.0, 0.811);
    cairo_pattern_add_color_stop_rgba (pattern, 0.64,
				       0.345, 0.345, 1.0, 0.317);
    cairo_pattern_add_color_stop_rgba (pattern, 0.84,
				       0.713, 0.713, 1.0, 0.137);
    cairo_pattern_add_color_stop_rgba (pattern, 1.0,
				       1.0, 1.0, 1.0, 0.0);

    cairo_pattern_set_filter (pattern, CAIRO_FILTER_BILINEAR);
    cairo_set_source (cr, pattern);
    cairo_pattern_destroy (pattern);

    cairo_arc (cr, 0.5, 0.5, 142.0/150.0, 0.0, M_PI * 2.0);
    cairo_fill (cr);
}

int
main (void)
{
    cairo_surface_t *surface;
    cairo_t *cr;
    cairo_status_t status;

    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 256, 256);
    cr = cairo_create (surface);
    cairo_surface_destroy (surface);

    draw (cr, 256, 256);

    status = cairo_surface_write_to_png (cairo_get_target (cr), "test.png");
    cairo_destroy (cr);

    return status != CAIRO_STATUS_SUCCESS;
}