我使用'drawPath'绘制了一个Sprite。
然后我使用以下方法对此Sprite应用过滤器:
var myBlur:BlurFilter = new BlurFilter();
myBlur.blurX = 10;
myBlur.blurY = 10;
_alphaMask.filters = [myBlur];
然后我需要'剪掉'精灵的一部分并将其用作不同精灵的面具。
问题是 - 当我剪掉雪碧时 - 我需要剪切'边缘'不要模糊,
但'BlurFilter'应用于'cut'Sprite,因此边缘模糊。
problem in pictures http://s11.postimage.org/820by8y29/Prblm_Mask2.png
我想到了解决它的方法有两个问题:
将带有过滤器的Sprite中的BitmapData绘制到新的Sprite上, 然后在新的Sprite上使用'scrollRect'。
这种方法存在两个问题:
有人能告诉我如何在不复制位图数据的情况下解决这个问题吗?
更新
以下是我使用的代码段:
private var _alphaMask:Sprite;
private createMask():void
{
_alphaMask = new Sprite();
_alphaMask.visible = true;
// Clear the mask
_alphaMask.graphics.clear();
// Create the mask vertices (the 'drawPath' coordinates)
var maskPoints:Vector.<Number> = new Vector.<Number>(5);
maskPoints.push(100); maskPoints.push(100);
maskPoints.push(200); maskPoints.push(200);
maskPoints.push(230); maskPoints.push(310);
maskPoints.push(140); maskPoints.push(170);
maskPoints.push(130); maskPoints.push(190);
// Create the 'drawPath' commands
var commands:Vector.<int> = new Vector.<int>(commandLen);
commands.push(1);
commands.push(2);
commands.push(2);
commands.push(2);
commands.push(2);
// Draw the vertices on the mask
_alphaMask.graphics.beginFill(0x0000FF);
_alphaMask.graphics.drawPath(commands, clonedMaskPoints);
_alphaMask.graphics.endFill();
// Add the Blur filter to the mask
var myBlur:BlurFilter = new BlurFilter();
myBlur.blurX = myBlur.blurY = 10;
_alphaMask.filters = [myBlur];
// Now I need to 'Cut Out' a section of the mask (and use it for something else...)
// This section cuts out the part of the mask I need, but it 'reapplies' the blur filter on the entire cut mask
var scrollRect_x:Number = 100;
var scrollRect_y:Number = 100;
var scrollRect_width:Number = 300;
var scrollRect_height:Number = 200
_alphaMask.scrollRect = new Rectangle(scrollRect_x, scrollRect_y, scrollRect_width, scrollRect_height);
}
这就是我试图解决问题的方法(没有成功):
var alphaBitmapData:BitmapData = new BitmapData(_alphaMask.width, _alphaMask.height);
alphaBitmapData.draw(_alphaMask);
_alphaMask.graphics.clear();
_alphaMask.graphics.beginBitmapFill(alphaBitmapData);
_alphaMask.graphics.endFill();