Re: why i can't draw the graphic??

[=?gb2312?b?6Zkg6IM=?= <bdragon2001 hotmail com>]

> From: James Henstridge <james daa com au>
> To: 闂?閼?<bdragon2001 hotmail com>
> CC: gnome-devel-list gnome org
> Subject: Re: why i can't draw the graphic??
> Date: Wed, 10 Jul 2002 17:06:30 +0800
>
>
> 闂?閼?wrote:
>
> > hi,
> >   i am using the GDK to draw graphic,the compilation is ok.but it 
> > still can't draw
> >
> > the graphic.here is my code:
>
> [snip]
>
> >     Drawing_area=gtk_drawing_area_new ();
> >     gtk_drawing_area_size (GTK_DRAWING_AREA 
> > (Drawing_area),640,300);
>
> [snip]
>
> >     /* draw the graphic */
> >     gdk_draw_rectangle(Drawing_area->window,
> >                Drawing_area->style->white_gc,
> >                TRUE,
> >                0,0,
> >                Drawing_area->allocation.width,
> >                Drawing_area->allocation.height);
> >
> >     /*gdk_draw_line(Drawing_area->window,
> >               Drawing_area->style->black_gc,0,0,100,100);
> >        */
>
> [snip]
>
> > Where is the bug?
> > Thanks for any help.
> With a drawing area, you should connect to the expose event, and 
> your handler should redraw the widget on demand.  The following 
> section of the GTK+ tutorial may give you some ideas:
>  http://www.gtk.org/tutorial/sec-thedrawingareawidget.html
>
> James.
>
> --

hi,james
  
  After reading the material showed by you,I don't understand why the 
first time 

drawing can't be viewed?and it is obviously hidden.

  The configure event,i keep it in the code.But only when i hit the 
window,the 

configure event will happen,and draw the graphic.It make me confused 
because it 

should happen when the window originally produced.

  regards,                     



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