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iOS Programming Recipe 24: Creating a Mask for Clipping Drawings

This Recipe is inspired by a recent problem I ran into and had quite a bit of trouble with it. Basically I wanted to create a shape and fill it with a gradient. Sounds pretty easy huh? well, not quite as we’ll find out shortly. While my particular application required filling a circle with an ellipse, we can create any shape. In essence we’re creating a window (shaped however we want) where the user can see only a portion of the drawing behind it.

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