Sorry for mudling the issue. After looking at my code again the reason I used 1.5 width and height is because x,y can be non-integer to enable smooth sub-pixel animation. The 1.5 enables a full pixel to be visible at all times, otherwise pixels seem to flicker as they move. ~Gerdus <div class="gmail_quote">On Thu, Apr 10, 2008 at 7:20 PM, Carl Worth <<a href="mailto:cworth@cworth.org">cworth@cworth.org</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="Ih2E3d">On Thu, 10 Apr 2008 18:13:23 +0200, "Gerdus van Zyl" wrote: > I use the following: > ctx.rectangle(p.x,p.y,1.5,1.5) > ctx.fill() > > the reason for the 0.5 larger is the little squares,sample point model > described in "How do I draw a sharp, single-pixel-wide line?" in > <a href="http://www.cairographics.org/FAQ/#sharp_lines" target="_blank">http://www.cairographics.org/FAQ/#sharp_lines</a> </div>Hi Gerdus, I think I really need to clarify that FAQ answer somehow. The correct code for drawing a single pixel, (assuming the default identity transformation matrix), is:        cairo_rectangle (cr, x, y, 1.0, 1.0);        cairo_fill (cr); with both x and y as integers. Please let me know what text on that page might have caused the misunderstanding so that I can fix it. Thanks, -Carl </blockquote></div>