Re: [gtk-list] small circles are square ... :(

[Sven LUTHER <luther maxime u-strasbg fr>]

On Thu, May 20, 1999 at 02:58:01PM +0000, José Miguel R. Barrientos wrote:
> Sven LUTHER wrote:
> > 
> > Hello,
> > 
> > Why are small circles square ?
> > 
> > try
> > 
> > gdk_draw_arc drawable white true x y 5 5 0 (360*64)
> > 
> > this draws :   while this is more round :
> > 
> >   XXXXX                XXX
> >   XXXXX               XXXXX
> >   XXXXX               XXXXX
> >   XXXXX               XXXXX
> >   XXXXX                XXX
> > 
> > 
> > But then this is a X problem, right ?
> > 
> > but could we not supply our own circle drawing primitive in case the default
> > one is not ok ? just for very small diameters ? i was forced to draw the second
> > shape by hand for this with lots of gdk_draw_points :(
> > 
> > 
> > Friendly,
> > 
> > Sven LUTHER
> > 
> > --
> > To unsubscribe: mail -s unsubscribe gtk-list-request@redhat.com < /dev/null
> 
> It's a problem with XFillArc (a X11 primitive).
> 
> But there's a workaround (don't ask me why it works), create a drawing_area and
> try this:
> 
> /* */
> void widget_exposed(GtkWidget *wid, GdkEventExpose *ev) {
> 	int	w;
> 
> 	for(w = 10; w > 2; w--) {
> 		/* Empty */
> 		gdk_draw_arc(wid->window, wid->style->white_gc,
> 				FALSE, 90-(8*w), 90-(8*w), w, w, 0, (long)(64*360));
> 		/* Filled */
> 		gdk_draw_arc(wid->window, wid->style->white_gc,
> 				FALSE, 90-(8*w), 110-(8*w), w, w, 0, (long)(64*360));
> 		gdk_draw_arc(wid->window, wid->style->white_gc,
> 				TRUE, 90-(8*w), 110-(8*w), w, w, 0, (long)(64*360));
> 	}
> }

It works, ...

guess it has to do with the empty circles that we draw first ...

Thanks,

Friendly,

Sven LUTHER