AS3实例：框选对象

[img]http://dl.iteye.com/upload/attachment/0066/1784/bd081d38-da73-3065-bd3b-9330c699cb53.jpg[/img]


[img]http://dl.iteye.com/upload/attachment/0066/1786/b93e8cd9-5c01-37c1-98b6-ef4e943bc02f.jpg[/img]


代码：

package  
{
	import com.duowan.util.DrawUtil;
	import flash.display.DisplayObject;
	import flash.display.Sprite;
	import flash.events.MouseEvent;
	import flash.geom.Point;
	import flash.geom.Rectangle;
	import flash.text.TextField;

	/**
	 * ...
	 * @author hacker47
	 */
	public class SelectMain extends Sprite 
	{
		private var p0:Point = new Point();
		private var drawWidth:Number;
		private var drawHeight:Number;

		public function SelectMain() 
		{
			stage.addEventListener(MouseEvent.MOUSE_DOWN, onDown);
		}

		private function onDown(e:MouseEvent):void {
			p0.x=mouseX;
			p0.y= mouseY;
			stage.addEventListener(MouseEvent.MOUSE_MOVE, onMove);
			stage.addEventListener(MouseEvent.MOUSE_UP, onUp);
		}

		private function onMove(e:MouseEvent):void {
			drawWidth = mouseX - p0.x;
			drawHeight = mouseY -p0.y;
			graphics.clear();
			DrawUtil.drawRect(graphics, p0, drawWidth, drawHeight);
		}

		private function onUp(e:MouseEvent):void {
			stage.removeEventListener(MouseEvent.MOUSE_MOVE, onMove);
			checkRange();
		}

		private function checkRange():void {
			if (drawWidth < 0) {
				drawWidth = -drawWidth;
				p0.x -= drawWidth;
			}

			if (drawHeight < 0) {
				drawHeight = -drawHeight;
				p0.y -= drawHeight;
			}

			for (var i:int = 0; i < this.numChildren; i++ ) {
				var d:DisplayObject = getChildAt(i);
				var rect:Rectangle = d.getRect(this);
				if (rect.x > p0.x && rect.x < (p0.x + drawWidth)) {
					if (rect.y > p0.y && rect.y < (p0.y + drawHeight)) {
						selectedDraw(rect);
					}
				}

			}
		}

		private function selectedDraw(rect:Rectangle):void {
			graphics.lineStyle(2, 0x336699);
			graphics.drawRect(rect.x, rect.y, rect.width, rect.height);
		}

	}

}