Re: how to draw using GtkDrawingArea?

[Olexiy Avramchenko <ath beast stu cn ua>]

Aaron Phillips wrote:

> Hello 
> I'm new to Gtk and need a bit of direction on how to draw (as to a
> canvas) in Gtk.  The track I'm on now is to use GtkDrawingArea with Gdk
> primitives.  I am having trouble with this.  I am trying to respond to a
> GtkImageMenuItem "activate" event by drawing a figure to the drawing
> area.  Here is the line that does this:
>         gdk_draw_arc (drawingarea->window,
>                         drawingarea->style->fg_gc[GTK_WIDGET_STATE(drawingarea)],
>                         TRUE,
> 			5, 5, 
> 			10, 10, 0, 64 * 360);
> The problem is nothing happens on the drawing area.  Is there some
> refresh-type function I need to call or something, or am i totally on
> the wrong track.
You need to implement an "expose_event" signal handler. Look at 
"scribble-simple" example
(it comes with gtk source) it shows how this can be implemented.

Olexiy