超高效的不规则物体碰撞检测

public function Test() {
init();
mc1.addEventListener(MouseEvent.MOUSE_DOWN,mouseDownHandler);
}
public function init() {
tempX = tempY = 0;
newColor = new ColorTransform();
matrix = target.transform.concatenatedMatrix;
matrix.tx = localToGlobal.x - hitRectangle.x;
matrix.ty = localToGlobal.y - hitRectangle.y;
matrix.a = matrix.a / rootConcatenatedMatrix.a;
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 );
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 );
mc1.removeEventListener(MouseEvent.MOUSE_UP,mouseUpHandler);
}
private function mouseDownHandler(e:MouseEvent){
tempX = mouseX - mc1.x;
tempY = mouseY - mc1.y;
}
private function changeMC2Color(){
newColor.color = 0xFF6600;
mc2.transform.colorTransform = newColor;
}
private function eventFinishAction(){
newColor.color = 0x173264;
mc2.transform.colorTransform = newColor;
}
private function mouseUpHandler(e:MouseEvent){
mc1.removeEventListener(MouseEvent.MOUSE_MOVE,mouseMoveHandler);
matrix.d = matrix.d / rootConcatenatedMatrix.d;
if( accurracy != 1 ) matrix.scale( accurracy, accurracy );
return matrix;
}
}
}
原文地址：http://www.tink.ws/blog/as-30-hittest
import flash.events.*;
import CostomHitTest.CostomHitTest;
public class Test extends MovieClip{
private var tempX:Number, tempY:Number;
private var newColor:ColorTransform;
{
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.
var bitmapData:BitmapData = new BitmapData( hitRectangle.width * accurracy, hitRectangle.height * accurracy, false, 0x000000 );
// Draw the first target.
intersection.y = Math.max( bounds1.y, bounds2.y );
intersection.width = Math.min( ( bounds1.x + bounds1.width ) - intersection.x, ( bounds2.x + bounds2.width ) - intersection.x );
mc1.addEventListener(MouseEvent.MOUSE_UP,mouseUpHandler);
mc1.addEventListener(MouseEvent.MOUSE_MOVE,mouseMoveHandler);
}
private function mouseMoveHandler(e:MouseEvent){
// Find the intersection.
var intersection:Rectangle = bitmapData.getColorBoundsRect( 0xFFFFFFFF,0xFF00FFFF );
bitmapData.dispose();
// Alter width and positions to compensate for accurracy
// If their boundaries are no interesecting, they cannot be intersecting.
if( hitRectangle.width * accurracy <1 || hitRectangle.height * accurracy <1 ) return new Rectangle();
超高效的不规则物体碰撞检测的类
测试代码:
package {
//author:Michael
//home:/wwwanq/
//QQ:444153452
//E-mail:xuzhenhui0425@
import flash.display.*;
iቤተ መጻሕፍቲ ባይዱport flash.geom.*;
if( accurracy != 1 )
{
intersection.x /= accurracy;
intersection.y /= accurracy;
intersection.width /= accurracy;
intersection.height /= accurracy;
}
intersection.x += hitRectangle.x;
var bounds2:Rectangle = target2.getBounds( target2.root );
// Determine test area boundaries.
var intersection:Rectangle = new Rectangle();
intersection.x = Math.max( bounds1.x, bounds2.x );
{
var localToGlobal:Point;;
var matrix:Matrix;
var rootConcatenatedMatrix:Matrix = target.root.transform.concatenatedMatrix;
localToGlobal = target.localToGlobal( new Point( ) );