Re: WHY: (gtk_draw_point ) assertion `GDK_IS_DRAWABLE (drawable)' failed ?

[iain <iain prettypeople org>]

On Sat, 2003-09-27 at 14:11, manu aradhya wrote:

>  da = gtk_drawing_area_new ();
>  gtk_drawing_area_size (GTK_DRAWING_AREA (da), 60,
>  60);
>   gtk_widget_show (da);
>  gtk_container_add (GTK_CONTAINER (fixed), da);
>  gdk_draw_point (da->window, da->style->black_gc,
>  x,
>  y);
>  gdk_draw_point (da->window, da->style->black_gc,
>  x, y);
>
> gtk_container_add (GTK_CONTAINER(window),fixed);
>  gtk_widget_set_size_request (window,500,400);
>  gtk_widget_show_all (window);
>  gtk_main ();
>
> Ian now also it is failing why?

2 things:
a) You need to realize widgets before they can be drawn on. Doing a
gtk_widget_show_all on the toplevel window will do it for you, or you
can force it by calling gtk_widget_realize.
b) You can only do drawing in the expose_event callback otherwise it
won't show up.

iain
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