Beautifl - Flash Gallery

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SquareLines
ton 2010年3月12日 All rights reserved
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      package {
    import flash.display.*;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.geom.Point;
    
    public class SquareLines extends Sprite {
        private var _bmd:BitmapData;
        private var _prev:Point;
        private var _rect:Shape;
        private var _canvas:Sprite;
        public function SquareLines():void {
            _bmd = new BitmapData(465, 465);
            addChild(new Bitmap(_bmd));
            _canvas = new Sprite();
            _rect = new Shape();
            _canvas.addChild(_rect);
            stage.addEventListener(MouseEvent.MOUSE_MOVE, update);
            stage.addEventListener(Event.MOUSE_LEAVE, leave);
        }
        
        private function update(e:MouseEvent):void {
            if(_prev == null) _prev = new Point(mouseX, mouseY);
            var dx:Number = mouseX - _prev.x;
            var dy:Number = mouseY - _prev.y;
            var dis:Number = Math.sqrt(dx * dx + dy * dy);
            var rad:Number = Math.atan2(dy, dx) * 180 / Math.PI;
            _prev.x = mouseX;
            _prev.y = mouseY;
            
            _rect.graphics.clear();
            _rect.graphics.beginFill(0xffffff);
            _rect.graphics.lineStyle(0, 0x000000, 0.5);
            _rect.graphics.drawRect( -dis, -dis/4, dis, dis/2);
            _rect.rotation = rad;
            _rect.x = mouseX;
            _rect.y = mouseY;
            
            _bmd.draw(_canvas);        
        }
        
        private function leave(e:Event):void {
            _prev = null;
        }        
    }
}