"Hibberd, Elisabeth" wrote:
>
> 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;
> }
You need to create the GdkGC, and also to allocate the GdkColor.
GdkGC *gc;
GdkColormap *colormap;
GdkColor color = { 0xffff,0xffff,0xffff,0xffff};
gc = gdk_gc_new (widget->window);
colormap = gtk_widget_get_colormap (widget);
if (!gdk_colormap_alloc_color (colormap, &color, FALSE, TRUE))
g_warning ("Failed to allocate color");
You'd typically only want to do all this once, and the GdkGC can only
be created after the widget is realized.
Damon
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