+/**
+ * gis_callback_new:
+ * @callback: the function to call to draw the object
+ * @user_data: user data to pass to the drawing function
+ *
+ * Create a #GisCallback object with an associated function and user data.
+ *
+ * Returns: the new #GisCallback
+ */
+GisCallback *gis_callback_new(GisCallbackFunc draw_cb, gpointer user_data)
+{
+ GisCallback *cb = g_object_new(GIS_TYPE_CALLBACK, NULL);
+ cb->draw = draw_cb;
+ cb->user_data = user_data;
+ return cb;
+}
+
+/* Proxy class methods to per-object methods */
+static void proxy_draw(GisObject *_cb, GisOpenGL *opengl)
+{
+ GisCallback *cb = GIS_CALLBACK(_cb);
+ if (cb->draw)
+ cb->draw(cb, opengl, cb->user_data);
+}
+