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3. 比图Data——一个矩阵中的比额表和选定领域?
原标题:BitmapData - scale and select area in one matrix?

• 采用变式矩阵作为蓝图的一部分,选择我的目标领域,而不是从0:

var bmd:BitmapData = new BitmapData(target.width,target.height,true,0);
var mat:Matrix = new Matrix(1,0,0,1,-target.x,-target.y);
bmd.draw(this,mat);

这一工作十分完善,将<条码>本/条码>的内容作为边界列入<条码>。 我也能够使用一个矩阵来进行规模化。

var scale:Number = .32;
var bmd:BitmapData = new BitmapData(target.width/scale,target.height/scale,true,0);
var mat:Matrix = new Matrix(scale,0,0,scale);
bmd.draw(this,mat);

问题在于我试图把这两者合并为一个行动:

var scale:Number = .32;
var bmd:BitmapData = new BitmapData(target.width/scale,target.height/scale,true,0);
var mat:Matrix = new Matrix(scale,0,0,scale,-target.x,-target.y);
bmd.draw(this,mat);

我不敢肯定这里会发生什么错误,但是,如果在舞台上把这加起来,就没有任何东西可以显示,如果我只做一个行动,或者他们都按照预期工作。 任何想法?

最佳回答

今天,我回答第二个问题。 t和ty属必须乘以比额表因素,以维护正确的抵消价值。 简言之,这是与矩阵翻译顺序做些什么?

解决办法:

var scale:Number = .32;
var bmd:BitmapData = new BitmapData(target.width/scale,target.height/scale,true,0);
var mat:Matrix = new Matrix(scale,0,0,scale,-(target.x*scale),-(target.y*scale));
bmd.draw(this,mat);
问题回答

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