Chapter 6. Symbols, Instances, and the Library
IN THIS CHAPTER
Working with Libraries in Flash: Document Library and External Libraries
Organizing your Library and resolving conflicts
Defining content types and managing assets
Understanding basic symbol types: Graphic symbols, Button symbols, Movie Clips
Special symbol types: Components and Timeline Effect symbols
Linking and updating symbols with Authortime Shared libraries
Symbols are the key to file-size efficiency and interactive power in Flash. A symbol is a reusable element that resides in the current movie's document Library, which you access with Window
Using symbols helps reduce the file size of your finished movie because Flash needs to save the symbol only once. Each time a given symbol is used in the project, Flash refers to its original profile. To support the variations of an instance, Flash needs to save information about the differences only — such as size, position, proportions, and color effects. If a separate graphic was used for each change, Flash would have to store a complete profile of all the information about that graphic — not just the changes, but also all of the points that specify what the original graphic looks like.
Furthermore, symbols can save you a lot of time and trouble, particularly when it comes to editing your movie. That's because changes made to a symbol are reflected in each instance of that symbol ...