>
> 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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