iPhone in Action

Chapter 19. Graphics: Quartz, Core Animation, and OpenGL

This chapter covers

Using Quartz 2D for drawing Understanding context, paths, and state Using Core Animation Learning about OpenGL ES

As we saw in the last chapter, creating and displaying images often isn’t enough. In games and other more complex programs, you’ll also want to manipulate those images in various ways at runtime. The iPhone OS offers two major ways to do this.

The first is through Quartz 2D, a two-dimensional drawing library that allows for complex line drawings, much as Canvas did on the web. It’s also the heart of the Core Graphics frameworks. We already touched upon Quartz in the previous chapter, when we drew images straight to the CALayer of a UIView; it’ll ...