Changes

This chapter has covered some of the basic principles behind the drawing of two dimensional graphics on the iPad using the Quartz 2D API. Topics covered included obtaining the graphics context, implementing the drawRect method and the handling of colors and transparency. In [[An iOS4 iOS 4 iPad Graphics Drawing Tutorial using Quartz 2D (Xcode 4)|An iOS4 iPad Graphics Drawing Tutorial using Quartz 2D]], this theory will be put into practice with examples of how to draw a variety of shapes and images on an iPad screen.