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Using Symbols and the Library in Flash MX

Chapter Description

In this sample chapter, you'll learn to use Flash MX's symbols, libraries, and the Movie Explorer to manage your movies and keep them small, fast, and organized. You will also learn how to use and how to import bitmaps.

Creating a symbol

Each object you create increases the size of your final movie. What if you could reuse objects? You can. Any object that you intend to use more than once should be turned into a symbol.

Symbols reside in the Flash library. You can drag multiple copies of a symbol from the library to the stage. Each copy of the symbol on the stage is an instance of the symbol. Adding multiple instances to your movie does not significantly increase the movie size. Flash only records the properties of the new instance; its description already exists in the library. When you change an instance in the library, all instances on the stage are updated.

Instances of symbols can have different colors, sizes, and behaviors.

In this exercise, you'll create a symbol. Later in the lesson, you'll edit this symbol in your Flash movie.

1) Select both of the bitmaps in the Main Page Bitmaps layer and choose Insert > Convert to Symbol.

To select both bitmaps, hold down the Shift key and click on one bitmap, and then select the second one.

When you choose Insert > Convert to Symbol, the Convert to Symbol dialog box opens. The Convert to Symbol command nests whatever you have selected into a symbol. You can also create a new, empty symbol by choosing Insert > New Symbol, that will open the Create New Symbol dialog box. The Create New Symbol dialog box is identical to the Convert to Symbol dialog box.

NOTE

For future reference, both Convert to Symbol and Create New Symbol will be referred to as the Symbol Properties dialog box. The dialog boxes are identical, except for their titles.

2) In the Symbol Properties dialog box, set the Name to Bitmap Animation. Make sure the Behavior is set to Movie Clip.

Figure 10

NOTE

Remember, for the remainder of this book, the Convert to Symbol and Create New Symbol dialog boxes will be referred to as the Symbol Properties dialog box.

The Symbol Properties dialog box lets you set a name and behavior for a symbol. The name is important because it allows you to keep track of all your symbols; each symbol must have a unique name.

Flash has four symbol behaviors: graphic, button, movie clip, and font. You can create graphic, button, and movie clip symbols using the Symbol Properties dialog box.

Graphic symbols are useful for static images and reusable animations that are tied to the timeline. Graphic is the best behavior for a static graphic that you plan to use more than once in your movie. Graphic symbols can contain bitmaps, graphics, and other graphic symbols, but cannot contain interactions or sounds. Graphic symbols can also contain movie clips, but if the movie clip includes interactions or sounds, the clips might not work properly in the graphic symbol.

You can use the button behavior to create interactive buttons with different graphics for each button state—you'll make and use a button in Lesson 5. Buttons can contain sounds, graphic symbols, bitmaps, movie clips, and vector graphics.

Many of the symbols that you create through the course of this book will be movie clips. Movie clips are great for reusable pieces of animation, which is exactly what the Bitmap Animation is going to be. Unlike graphic symbols, the animation in a movie clip is not tied to the timeline. You'll learn more about timelines in Lesson 4 when you start creating animations. Movie clips are basically mini-movies inside the main movie. Movie-clips can contain interactions, sounds, and other movie clips, as well as vector graphics, bitmaps, and graphic symbols.

3) Set the Registration to the top-left corner. Click OK.

Figure 11

To set the registration, click the top left square of the diagram in the Symbol Properties dialog box. Selecting the top left square will set the center point of the symbol to its top-left corner.

When you click OK, Flash creates an instance of the Bitmap Animation movie clip. You should see a bounding box around both of the bitmaps, which are now nested inside of the symbol. You should also notice a crosshair and white dot, the registration point, in the top-left corner of the symbol.

Figure 12

In addition to the name, behavior, and registration properties, the Symbol Properties dialog box has an Advanced button. You can use the advanced button to expand the properties to include Linkage and Source. You'll learn more about these properties later in the book.

NOTE

When you set the behavior and registration properties for a symbol, the next symbol you create automatically has the same properties. For example, if you create a symbol and set its behavior to movie clip, the next time you open the symbol properties dialog box to create a new symbol, the behavior will be set to movie clip. You can easily change the settings for the behavior and registration.

4) Save the file as zoo8.fla.

You now have a symbol in your movie. An instance of that symbol sits on the stage in the Main Page Bitmaps layer. Remember an instance is just a copy of the original symbol.

Keep the file open, as you will continue with the next exercise.

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