Re: [gtk-list] Drawing area color weirdness help?

[Jan Kellmer <jkellmer dialup nacamar de>]

Andrew P. Lentvorski wrote:

> Okay, I created a set of widgets and packed everything together.
> One of the widgets is a GtlDrawingArea.  Fine.  I attach the expose
> event to the callback function at the bottom of this message.
> Everything comes up fine.  It even creates a nice red rectangle.
> Then I resize the window ... urp ... the color in the GtlDrawingArea
> changes to a random color every time I resize it.  Yellow .. Green ...
> Blue ... you name it.  No particular rhyme or reason.
>
> Why?
>
> I'm assuming that I'm doing something wrong, but I have no idea what.
>
> Also, how do you create a GdkColor from an RGB value?
>
> Thanks,
> Andy Lentvorski
>
> Expose callback function starts here:
> static gint
> wave_expose_event(GtkWidget *widget, GdkEventExpose *event)
> {
>   gint width,height;
>   GdkColor foreground;
>   GdkGC *mygc;
>
>   if (!gdk_color_parse("red",&foreground))
>     {
>       fprintf(stderr,"Failed to parse color\n");
>     }
>
>   gdk_window_get_size(widget->window,&width,&height);
>
>   if (!(mygc = gdk_gc_new(widget->window)))
>     {
>       fprintf(stderr,"Failed to allocate GC\n");
>     }
>
>   gdk_gc_set_foreground(mygc,&foreground);
>
>   gdk_draw_rectangle(widget->window,
>                      mygc,
>                      TRUE,
>                      0,0,
>                      width,height);
>
>   gdk_gc_destroy(mygc);
>
>   return FALSE;
> }
>
> --
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Probably you forgot to allocate the color in the widget colormap. Look at FAQ
5.2
"How do I use color allocation?".
    Jan