Macromedia Flash 8 for Windows and Macintosh: Visual Quickstart Guide

6. Graphics on Multiple Layers

In Flash 8, you create an illusion of three-dimensional depth by overlapping graphic elements. As you learned in Chapter 5, you can create this overlapping effect on one layer by stacking drawing-objects, groups, and symbols. The more elements the layer contains, however, the more difficult it becomes to manipulate and keep track of their stacking order. Layers help you to bring that task under control.

You can think of a Flash document as being like a stack of filmstrips: a sheaf of long, clear acetate strips divided into frames. Each filmstrip is analogous to a Flash layer. Shapes painted on the top filmstrip obscure shapes on lower strips; where the top filmstrip is blank, elements from lower strips show through. ...