Which framework is the most suitable to create a primitive shape drawing app?

I am creating a drawing app on iPad which allow开发者_运维知识库 the user to create primitive shapes like rectangles, polygons, arcs, etc. This app enables the user to rotate and scale these shapes. So, which would you prefer: OpenGL ES or Quartz?

Have a look at CoreAnimation (QuartzCore.framework), particularly CAShapeLayer class - it will allow you easily draw shapes + will provides animation effects for many scenarios "out of the box".