ActionScript 3.0 Design Patterns

Using Flash’s Built-in Composite Structure: the Display List | 239

ences the root node of the airplane. The whole composite plane structure plane is

then added to the display object container linked to theMainclass (line 18). Because

theMainclass is thedocument classof the Flash document, the airplane is added to

thestage, which is the root node of the display list.

Figure 6-9. Hierarchical tree structure of the airplane

Example 6-25. Main.as

1 package

2 {

3 import flash.display.Sprite;

4

5 /**

6 * Main Class

7 * @ purpose: Document class for movie

8 */

9 public class Main extends Sprite

10 {

11 private var airPlane:Composite;

12

13 public function Main( )

14 {

15 // create airplane

16 airPlane = new Composite(0.0);

17 airPlane.x = 250; airPlane.y = 100;

18 addChild(airPlane);

19

20 // add fuselage

21 var fuselage:Composite = new Fuselage(1000, 0)

22 airPlane.addChild(fuselage);

23

24 // add main wing on the left (port side)

25 var rightWing:Composite = new MainWing(200, 0);

26 rightWing.x = 20; rightWing.y = 50;

27 fuselage.addChild(rightWing);

28

29 // add main wing on the right (starbord side)

30 var leftWing:Composite = new MainWing(200, 0);

airplane

fuselage

Main wing Main wing Tail wing Tail wing

engine engine