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Hi, I want to use cairo to draw on top of a window but don't know how to achieve it. Below is my code. bottom_image is always on top of top_image. Any suggestion for beginners is welcome. Richard #include <cairo.h> #include <gtk/gtk.h> cairo_surface_t *top_image; GtkWidget *bottom_image; static gboolean on_expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data) { cairo_t *cr; cr = gdk_cairo_create(widget->window); cairo_set_source_surface(cr, top_image, 0, 0); cairo_paint(cr); cairo_destroy(cr); return FALSE; } int main(int argc, char *argv[]) { GtkWidget *window; gtk_init(&argc, &argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); top_image = cairo_image_surface_create_from_png("top.png"); bottom_image = gtk_image_new_from_file("bottom.png"); gtk_container_add(GTK_CONTAINER(window), bottom_image); g_signal_connect(window, "expose-event", G_CALLBACK (on_expose_event), NULL); g_signal_connect(window, "destroy", G_CALLBACK (gtk_main_quit), NULL); gtk_widget_set_app_paintable(window, TRUE); gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER); gtk_window_set_default_size(GTK_WINDOW(window), 200, 200); gtk_widget_show_all(window); gtk_main(); cairo_surface_destroy(top_image); return 0; } |
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