卡卡西的木叶村

           以前收集的一个老外的代码，像素级别的碰撞，效率还可以，做RPG类游戏的可能用的到，下面是我做的一个测试，方向键控制，碰到后绿色的圆会变成红色的，试一把吧~~

以下是HitTest.as类，里面有静态方法

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package {   import flash.display.BitmapData;   import flash.display.BlendMode;   import flash.display.DisplayObject;   import flash.display.Sprite;   import flash.geom.ColorTransform;   import flash.geom.Matrix;   import flash.geom.Point;   import flash.geom.Rectangle;   public class HitTest {     public static function complexHitTestObject(target1:DisplayObject,target2:DisplayObject,accurracy:Number=1):Boolean {       return complexIntersectionRectangle(target1,target2,accurracy).width != 0;     }     public static function intersectionRectangle(target1:DisplayObject,target2:DisplayObject):Rectangle {       // If either of the items don't have a reference to stage, then they are not in a display list       // or if a simple hitTestObject is false, they cannot be intersecting.       if (! target1.root || ! target2.root || ! target1.hitTestObject(target2)) {         return new Rectangle ;       }       // Get the bounds of each DisplayObject.       var bounds1:Rectangle=target1.getBounds(target1.root);       var bounds2:Rectangle=target2.getBounds(target2.root);       // Determine test area boundaries.       var intersection:Rectangle=new Rectangle ;       intersection.x=Math.max(bounds1.x,bounds2.x);       intersection.y=Math.max(bounds1.y,bounds2.y);       intersection.width=Math.min(bounds1.x + bounds1.width - intersection.x,bounds2.x + bounds2.width - intersection.x);       intersection.height=Math.min(bounds1.y + bounds1.height - intersection.y,bounds2.y + bounds2.height - intersection.y);       return intersection;     }     public static function complexIntersectionRectangle(target1:DisplayObject,target2:DisplayObject,accurracy:Number=1):Rectangle {       if (accurracy <= 0) {         throw new Error("ArgumentError: Error #5001: Invalid value for accurracy",5001);       }       // If a simple hitTestObject is false, they cannot be intersecting.       if (! target1.hitTestObject(target2)) {         return new Rectangle ;       }       var hitRectangle:Rectangle=intersectionRectangle(target1,target2);       // If their boundaries are no interesecting, they cannot be intersecting.       if (hitRectangle.width * accurracy < 1 || hitRectangle.height * accurracy < 1) {         return new Rectangle ;       }       var bitmapData:BitmapData=new BitmapData(hitRectangle.width * accurracy,hitRectangle.height * accurracy,false,0x000000);       // Draw the first target.       bitmapData.draw(target1,HitTest.getDrawMatrix(target1,hitRectangle,accurracy),new ColorTransform(1,1,1,1,255,-255,-255,255));       // Overlay the second target.       bitmapData.draw(target2,HitTest.getDrawMatrix(target2,hitRectangle,accurracy),new ColorTransform(1,1,1,1,255,255,255,255),BlendMode.DIFFERENCE);       // Find the intersection.       var intersection:Rectangle=bitmapData.getColorBoundsRect(0xFFFFFFFF,0xFF00FFFF);       bitmapData.dispose();       // Alter width and positions to compensate for accurracy       if (accurracy != 1) {         intersection.x/= accurracy;         intersection.y/= accurracy;         intersection.width/= accurracy;         intersection.height/= accurracy;       }       intersection.x+= hitRectangle.x;       intersection.y+= hitRectangle.y;       return intersection;     }     protected static function getDrawMatrix(target:DisplayObject,hitRectangle:Rectangle,accurracy:Number):Matrix {       var localToGlobal:Point;       var matrix:Matrix;       var rootConcatenatedMatrix:Matrix=target.root.transform.concatenatedMatrix;       localToGlobal=target.localToGlobal(new Point );       matrix=target.transform.concatenatedMatrix;       matrix.tx=localToGlobal.x - hitRectangle.x;       matrix.ty=localToGlobal.y - hitRectangle.y;       matrix.a=matrix.a / rootConcatenatedMatrix.a;       matrix.d=matrix.d / rootConcatenatedMatrix.d;       if (accurracy != 1) {         matrix.scale(accurracy,accurracy);       }       return matrix;     }   } }

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