ActionScript 3.0 Design Patterns.pdf - VideoTutorials-bg.com

Example 6-18 shows the IPlane interface. It defines two operations, getDamage( )and
getWeight( ), that return the weight and damage.
Example 6-18. IPlane.as
package
{
public interface IPlane
{
function getDamage( ):Number;
function getWeight( ):Number;
}
}
Example 6-19 shows the component class for the airplane. It extends the Shape class
and implements the IPlane interface. As explained previously, Shape subclasses the
DisplayObject class. The constructor takes the weight and initial damage parameters,
and assigns them to the nWeight and nDamage properties. The implementation for
getWeight( ) and getDamage( ) is to simply return the requested property, as components
do not have children.
Example 6-19. Component.as
package
{
import flash.display.Shape;
}
public class Component extends Shape implements IPlane
{
protected var nDamage:Number;
protected var nWeight:Number;
}
public function Component(weight:Number, damage:Number = 0)
{
this.nDamage = damage;
this.nWeight = weight;
}
public function getDamage( ):Number
{
return nDamage;
}
public function getWeight( ):Number
{
return nWeight;
}
It is important to note that the Shape class doesn’t inherit from the InteractiveObject
class. Therefore, airplane component class cannot respond to user input such as
mouse clicks and key presses.
Using Flash’s Built-in Composite Structure: the Display List | 235