凤林松山

Actionscript的drawTriangles方法原来是为了三维的三角面准备的，我在实际项目中简单的用了下，用来简单的扭曲位图，效果还不错。下面写一个简单的例子，主要记用法，效果就不管了，呵呵。

package 
{
	import flash.display.BitmapData;
	import flash.display.Shape;
	import flash.display.Sprite;
	
	public class  DrawTrianglesDemo extends Sprite{
	
	private var _sp:Shape;
	
	public function DrawTrianglesDemo() {

		var vertices:Vector.;
		var indices:Vector.;
		var uvtData:Vector.;
		
		vertices = new Vector.(); //这里在这120×120的位图上定义了6个点
		vertices.push(0, 0);
		vertices.push(-10, 60); //这里如果是 vertices.push(0, 60);则左边不扭曲
		vertices.push(0, 120);
		vertices.push(120, 0);
		vertices.push(130, 60); //这里如果是 vertices.push(120, 60);则右边不扭曲
		vertices.push(120,120);
		
		indices = new Vector.();//这里用之前的6个点将图形分成4个三角形
		indices.push(0, 3, 4);
		indices.push(0, 1, 4);
		indices.push(1, 4, 5);
		indices.push(1, 2, 5);

		uvtData = new Vector.();//这里是定义6各点原来应在的位置
		uvtData.push(0, 0);
		uvtData.push(0, 0.5);
		uvtData.push(0, 1);
		uvtData.push(1, 0);
		uvtData.push(1, 0.5);
		uvtData.push(1, 1);
		
		_sp = face.getChildAt(0) as Shape;
		var myBitmapData:BitmapData = new BitmapData(_sp.width, _sp.height, true, 0xFFFFFF);
		myBitmapData.draw(_sp);
		
		_sp.graphics.clear();
		_sp.graphics.beginBitmapFill(myBitmapData);
		_sp.graphics.drawTriangles(vertices, indices, uvtData);
		_sp.graphics.endFill();
	}
	
	}
	
}