Using vector graphics in iPhone games

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Quartz 2D is a pretty lightweight framework for vector based graphics. It’s very well documented…

Quartz Documentation

In particular I’d pay particular notice to layering and performance…

Quartz Layering and Performance

If performance is a worry I’d also have a read through the core animation documentation. Core animation uses CALayers to cache vectors drawn with Quartz to in-memory bitmaps. These CALayers can then be transformed and translated through the animation APIs. If you intend to perform a lot of drawing this is the route I would recommend.