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_set_line_width (cr, 10.0);
cairo_arc_negative (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);
