[cairo] Draw a single pixel or group of pixels

Carl Worth cworth at cworth.org
Thu Apr 10 10:20:16 PDT 2008

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
> http://www.cairographics.org/FAQ/#sharp_lines

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.


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