The Jungle, Part 7: Quartz Demos (Section 3 of 3)

In this last section, we will combine the drawing abilities of Quartz with the blazing fast animations that are provided by Core Animation. Core Animation Primer Core Animation is a framework for animating a number of properties on views. It was introduced with OS X 10.5 (Leopard) and iPhone OS 3.0. Animation is important because it conveys visual feedback , especially in state change. For example, zooming in on OS X and iOS is an animated process, rather than jumping from one zoom level to another. This shows what happened, rather than providing a visual disconnect. Core Animation handles the animation implicitly, which means that, if you choose to accept the default options, you can simply set a property and the transition will be animated. Of course, you can also have fine-grained control of the animation. Core Animation animations are fully GPU-backed and coded through OpenGL. This allows the animations to be incredibly fast—the original iPhone could hit 30fps on UI animations while Windows XP and earlier versions of Android performed all the animation code in the CPU, which is a significant performance bottleneck (the benefits of hardware accelerated graphics).

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