What is the Algorithm behind a color wheel? [closed]

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I would like to draw a color wheel on my iPhone Application, how can I do so?

What is the Algorithm behind the color wheel? Thank you.

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If you are familiar with HSA color system the algorithm will be simple.

A color wheel depicts Hue and Saturation. The hue varies with the angle, and the saturation varies with the radius. For more information you can take a look at http://www.stackoverflow.com/questions/4235072/math-behind-the-colour-wheel