ActionScript3游戏中的图像编程（连载七）

 1 package{
 2 [SWF(width = "800", height = "600")]
 3  public class ShapeColorTransformTest extends Sprite{
 4   private var _testSprite_src:Sprite; //用于测试的显示对象（变换前）
 5   private var _testSprite_dst:Sprite;  //用于测试的显示对象（变换后）   private var _myColorTransform:ColorTransform;  //颜色转换对象
 6   public function ShapeColorTransformTest(){
 7    init();
 8   }
 9   private function init():void{
10    _testSprite_src = getTestSprite();            addChild(_testSprite_src);
11    _testSprite_dst = getTestSprite();   
12    _testSprite_dst.x = 200;
13    addChild(_testSprite_dst);
14    applyTransform();
15   }
16   //创建用于测试的显示对象
17   private function getTestSprite():Sprite{
18    var _testSprite:Sprite = new Sprite();
19    var _shape1:Shape = new Shape();  //添加一个黑色的矩形底
20    _shape1.graphics.beginFill(0x000000);
21    _shape1.graphics.drawRect(40, 30, 170, 290);
22    _shape1.graphics.endFill();
23    _testSprite.addChild(_shape1);
24    /*依次添加颜色分别为暗蓝，暗红，暗绿和纯白的4个圆*/
25    _testSprite.addChild(new Circle(50, 0x0000CC, 100, 200, "add"));
26    _testSprite.addChild(new Circle(50, 0xCC0000, 150, 200, "add"));
27    _testSprite.addChild(new Circle(50, 0x00CC00, 125, 250, 1,"add"));
28    _testSprite.addChild(new Circle(50, 0xFFFFFF, 125, 100, 1, add"));
29    return _testSprite;
30   }
31   private function applyTransform():void{
32    _myColorTransform = _testSprite_dst.transform.colorTransform; //初始化颜色变换对象（从显示对象里获取）
33    _myColorTransform.redMultiplier = 1.5;
34    _testSprite_dst.transform.colorTransform = _myColorTransform; //应用到显示对象上（变换后必须重新赋值，否则变换效果不起作用，详情可查阅帮助文档）
35  }
36 }

 1 package com.gemei.display{
 2  public class Circle extends Sprite{
 3  //为节省本书篇幅，我把x，y，alpha, blendMode这些基本属性都封装到Circle类里面了，项目开发中不推荐这么做
 4   public function Circle(radius:Number = 50, color:uint = 0x000000, x:Number = 0, y:Number = 0, alpha:Number = 1, blendMode:String = BlendMode.NORMAL){
 5    super();
 6    this.x = x; this.y = y; this.blendMode = blendMode;
 7    graphics.beginFill(color, alpha);
 8    graphics.drawCircle(0, 0, radius);
 9    graphics.endFill(); 
10   }
11   }
12 }