Hi Jeff
you were right, I got a segmetation error. But the reason was, I deleted
1 linr too many,
but I still got the problem, my backgroundcolour is still black, and I
would like to change it to different colours
Here is the new code :
gint MaleDrehscheibe(gpointer data)
{
GtkWidget* drawing_area = (GtkWidget *) data;
GdkDrawable *drawable;
GdkGC *gc;
GdkFont *font;
GdkColormap *colormap;
GdkColor color = { 0xffff,0xffff,0xffff,0xffff};
gc = gdk_gc_new (drawing_area->window);
colormap = gtk_widget_get_colormap (drawing_area);
if (!gdk_colormap_alloc_color (colormap, &color, FALSE,
TRUE))
g_warning ("Failed to allocate color");
drawable = drawing_area->window;
gdk_gc_set_background(gc, &color) ;
gdk_draw_arc(drawable, gc, 1, 0, 0, 127, 127, 0, 360
*64);
font =
gdk_font_load("-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*");
gdk_draw_text (drawable, font,
drawing_area->style->black_gc, 30, 70, "Drehscheibe",11);
return 1;
}
Elisabeth Hibberd
email:[EMAIL PROTECTED]
Vossloh System-Technik
24145 Kiel
Edisonstraße 3
Tel: (49) 431 7109 354
Fax: (49) 431 7109 502
> -----Ursprüngliche Nachricht-----
> Von: Jeff Gunter [SMTP:[EMAIL PROTECTED]]
> Gesendet am: Keines
> An: [EMAIL PROTECTED]
> Betreff: Re: AW: Drawing circle
>
> >
> > Hi Chaplin,
> >
> > here is the code for drawing the circle
> >
> >
> /*------------DrawDrehscheibe-----------------------------------------
> --
> > ---------------------*/
> > gint MaleDrehscheibe(gpointer data)
> > {
> > GtkWidget* drawing_area = (GtkWidget *) data;
> > GdkDrawable *drawable;
> > GdkGC *gc;
> > GdkFont *font;
> >
> > GdkColor color = { 0xffff,0xffff,0xffff,0xffff};
> > drawable = drawing_area->window;
> >
> > gdk_gc_set_background(gc, &color) ;
> > gdk_draw_arc(drawable, gc, 1, 0, 0, 127, 127, 0, 360 *64);
> >
> > font =
> >
> gdk_font_load("-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*");
> > gdk_draw_text (drawable, font, drawing_area->style->black_gc,
> > 30, 70, "Drehscheibe",11);
> > return 1;
> > }
> >
>
>
>
> Don't you get a SEGFAULT when this runs? You have defined gc as a
> pointer to
> a graphics context but never allocated that graphics context or set gc
> to
> point to a known graphics context. I would suggest adding something
> like this:
>
>
> static GdkGC *gc=NULL;
>
> .
> .
> .
> if(!gc)
> {
> GdkColor color= {0xffff,0xffff,0xffff,0xffff};
> gc=gdk_gc_new(drawable);
> gdk_gc_set_background(gc, &color) ;
> }
>
> The idea is to create a basically valid gc from your drawing area and
> modify
> it. Since this involve shipping things back and forth to the X-server
> do it
> once and remember the pointer.
>
>
>
>
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