//像素級碰撞檢測

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

{

/**

* --------------------- 像素級碰撞檢測

* @param target1 DisplayObject

* @param target2 DisplayObject

* @param accurracy Number 檢測的精度 [0 , 1] 0 <= n <= 1

* @return Boolean

*/

public static function complexHitTestObject ( target1:DisplayObject, target2:DisplayObject, accurracy:Number = 1 ):Boolean

{

accurracy > 1 ? accurracy = 1 : 0;

return accurracy <= 0?false:complexIntersectionRectangle(target1,target2,accurracy).width != 0;

}

/**

* -------------------獲取矩形邊框重疊區域

* @param target1 DisplayObject

* @param target2 DisplayObject

* @return Rectangle

*/

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;

}

/**

* -------------------------- 獲取像素重疊區域

* @param target1 DisplayObject

* @param target2 DisplayObject

* @param accurracy Number 精度

* @return Rectangle

*/

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;

}

/**

* -------------------------獲取MC的矩陣

* @param target DisplayObject

* @param hitRectangle Rectangle

* @param accurracy Number

* @return Matrix

*/

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;

}

}

}

總結

以上是生活随笔為你收集整理的java 像素级碰撞检测,» 像素级碰撞检测类的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。