全局坐标与局部坐标互相转换

import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.geom.Point;

var square:Sprite = new Sprite();
square.graphics.beginFill(0xFFCC00);
square.graphics.drawRect(0, 0, 100, 100);
square.x = 100;
square.y = 200;

addChild(square);

square.addEventListener(MouseEvent.CLICK, traceCoordinates);

function traceCoordinates(event:MouseEvent):void
{
	//将 point 对象从显示对象的(本地)坐标转换为舞台(全局)坐标。 
	var squareClickPoint:Point = new Point(square.mouseX,square.mouseY);
	trace("display object coordinates:", squareClickPoint);
	var stageClickPoint:Point = square.localToGlobal(squareClickPoint);
	trace("stage coordinates:", stageClickPoint);
	//将 point 对象从舞台(全局)坐标转换为显示对象的(本地)坐标。 
	var _stageClickPoint:Point=new Point(mouseX,mouseY);
	var _squareClickPoint:Point = square.globalToLocal (_stageClickPoint);
	trace("display object coordinates:", _squareClickPoint);
	trace("stage coordinates:", _stageClickPoint);
}