[cairo] Problem in using cairo_set_source_rgb

Carl Worth cworth at cworth.org
Mon Feb 5 21:09:41 PST 2007


On Mon, 5 Feb 2007 23:03:39 -0600, "ken carlino" wrote:
> But nothing shows up. Here is my code:
> // does not work (nothing shows) when  I use lime green
>       cairo_set_source_rgb(cr2, 50.0, 205.0, 50.0);

Oops. Cairo is expecting values in the range of 0.0 to 1.0. So try
dividing each of those values by 255.0 and see if it doesn't work
better for you.

> // works when i set the color to red
> 	    //            cairo_set_source_rgb(cr2, 1.0, 0.0, 0.0);

Here you're using the range properly, (note that the web page you
listed shows red as (255, 0, 0).

-Carl
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