flower: Clear surface

diff --git a/clients/flower.c b/clients/flower.c
index 68c9062..54d54f2 100644 (file)
--- a/clients/flower.c
+++ b/clients/flower.c
@@ -62,6 +62,11 @@ draw_stuff(cairo_surface_t *surface, int width, int height)
        double x1, y1, x2, y2, x3, y3;
 
        cr = cairo_create(surface);
+       cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+       cairo_set_source_rgba(cr, 0, 0, 0, 0);
+       cairo_paint(cr);
+
+       cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
        cairo_translate(cr, width / 2, height / 2);
        cairo_move_to(cr, cos(0) * r1, sin(0) * r1);
        for (t = 0, i = 0; i < petal_count; i++, t += dt * 2) {