Changes

This chapter has covered some of the basic principles behind the drawing of two dimensional graphics on the iPhone 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 iOS 6 iPhone Graphics Drawing Tutorial using Quartz 2Dand Core Image]], this theory will be put into practice with examples of how to draw a variety of shapes and images on an iPhone screen.