WebGLContext2D 类里面 如下方法 修改后即可
public function addPath(points:Array, close:Boolean, convex:Boolean, dx:Number, dy:Number):void {
var ci:int = 0;
for (var i:int = 0, sz:int = points.length / 2; i < sz; i++) {
var x1:Number = points[ci]+dx, y1:Number = points[ci + 1]+dy;
points[ci] = x1;
points[ci + 1] = y1;
ci += 2;
}
_getPath().push(points, convex);
}
