flash on 2013-6-1

/**
 * Copyright hemingway ( http://wonderfl.net/user/hemingway )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/vjYH
 */

package {
    import flash.display.*;
    import flash.events.*;
    import flash.geom.*;
    
    public class Main extends Sprite
    {
        private var pixelBallisticBegin :Point;
        private var pixelBallisticEnd :Point;
        private var pixelBallisticVX :int;
        private var pixelBallisticVY :int;
        
        public function Main()
        {
            pixelBallisticBegin = new Point();
            pixelBallisticEnd = new Point();
            
            stage.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
            stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
            stage.addEventListener(Event.ENTER_FRAME, onFrame);
        }
        
        private function onMouseDown($e:MouseEvent) :void
        {
            pixelBallisticBegin = new Point($e.stageX, $e.stageY);
            
            stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
        }
        
        private function onMouseMove($e:MouseEvent) :void
        {
            pixelBallisticEnd = new Point($e.stageX, $e.stageY);
        }
        
        private function onMouseUp($e:MouseEvent) :void
        {
            stage.removeEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
            
            pixelBallisticEnd = new Point($e.stageX, $e.stageY);
        }
        
        private function onFrame($e:*) :void
        {
            pixelBallisticVX = 
            
            graphics.clear();
            graphics.lineStyle(1);
            graphics.moveTo(pixelBallisticBegin.x, pixelBallisticBegin.y);
            graphics.lineTo(pixelBallisticEnd.x, pixelBallisticEnd.y);
        }
    }
}