Re: [LAD] OT: gtk rectangle with opacity

gboolean box_expose(GtkWidget *wi, GdkEventExpose *ev, gpointer data) { cairo_t *cr; // create a cairo context // cr = gdk_cairo_create(wi->window); double x0 = wi->allocation.x; double y0 = wi->allocation.y; double rect_width = wi->allocation.width; double rect_height = wi->allocation.height; cairo_rectangle (cr, x0,y0,rect_width,rect_height+3); cairo_set_source_rgba (cr, 0, 0, 0, 0.5); // a set the opacity level cairo_fill (cr); cairo_destroy(cr); } draw a transparent black rectangle to the calling widget. You can connect it with to make sure it will redraw when needed. g_signal_connect(widget, "expose-event", G_CALLBACK(box_expose), NULL); more examples you could found here http://cairographics.org/samples/ regards hermann Am Montag, den 28.12.2009, 04:30 +1100 schrieb Patrick Shirkey: