Flash iOS Apps Cookbook

Using Cache as Bitmap Matrix

Cache as Bitmap is extremely useful for display objects that are only affected by two-dimensional translation. However, it is also possible to benefit from bitmap caching when applying other changes to a display object such as scaling and rotation. This is achieved by using a transform matrix in conjunction with a cached bitmap and is known as Cache as Bitmap Matrix.

Let us work through an example.

Getting ready

An FLA has been provided as a starting point. From the book's accompanying code bundle, open chapter6\recipe5\recipe.fla into Flash Professional.

Ten instances of a Monkey movie clip are positioned on top of a Background movie clip. All ten movie clips are continuously rotated and after five seconds, the average ...