Æliens

  
  
 www.senocular.com/flash/tutorials/as3withmxmlc


          
          import mx.core.UIComponent;
          import flash.display.Sprite;
          import flash.events.Event;
          import flash.events.MouseEvent;
          import flash.geom.Point;
          import flash.geom.Rectangle;
  
  

          
          public class temp extends UIComponent {
          
                  private var ball:TossableBall;
                  private var lastMouse:Point = new Point();
                  private var mouseMoved:Point = new Point();
                  public var w:Number = 500;
                  public var h:Number = 500;
                  
                  public function temp() {
                          //var bounds:Rectangle = new Rectangle(0, 0, stage.stageWidth, stage.stageHeight);
                          var bounds:Rectangle = new Rectangle(0, 0, w,h);
                          ball = new TossableBall(50, bounds);
                          ball.x = bounds.x + bounds.width/2;
                          ball.y = bounds.y + bounds.height/2;
                          addChild(ball);
                          
                          ball.addEventListener(MouseEvent.MOUSE_DOWN, grabBall);
                          ball.addEventListener(MouseEvent.MOUSE_UP, releaseBall);
                  }
                  
  

                  private function grabBall(evt:MouseEvent):void {
                          ball.toss(new Point(0,0));
                          ball.startDrag();
                          lastMouse = new Point(mouseX, mouseY);
                          
                          addEventListener(Event.ENTER_FRAME, moveBall);
                          moveBall(new Event(Event.ENTER_FRAME));
                  }
                  
  

                  private function releaseBall(evt:MouseEvent):void {
                          ball.stopDrag();
                          ball.toss(mouseMoved);
                          
                          removeEventListener(Event.ENTER_FRAME, moveBall);
                  }
                  
  

                  private function moveBall(evt:Event):void {
                          var currMouse:Point = new Point(mouseX, mouseY);
                          mouseMoved = currMouse.subtract(lastMouse);
                          lastMouse = currMouse;
                  }
          }
  }
  
  

  // only visible within file
  
  import flash.display.Sprite;
  import flash.events.Event;
  import flash.geom.Point;
  import flash.geom.Rectangle;
  
  class TossableBall extends Sprite {
          
          private var bounds:Rectangle;
          private var vector:Point = new Point();
          private var friction:Number = .95;
                  
  

          public function TossableBall(size:Number, throwBounds:Rectangle) {
                  bounds = throwBounds;
                  graphics.lineStyle(1);
                  graphics.beginFill(0xFF8000);
                  graphics.drawCircle(0, 0, size/2);
                  
                  addEventListener(Event.ENTER_FRAME, soar);
          }
  

          
          public function toss(tossVector:Point):void {
                  vector = tossVector;
          }
          
  

          private function soar(evt:Event):void {
                  x += vector.x;
                  y += vector.y;
                  var shapeBounds:Rectangle = getBounds(parent);
                  if (shapeBounds.left < bounds.left) {
                          vector.x = Math.abs(vector.x);
                  }else if (shapeBounds.right > bounds.right) {
                          vector.x = -Math.abs(vector.x);
                  }
                  if (shapeBounds.top < bounds.top) {
                          vector.y = Math.abs(vector.y);
                  }else if (shapeBounds.bottom > bounds.bottom) {
                          vector.y = -Math.abs(vector.y);
                  }
                  vector.x *= friction;
                  vector.y *= friction;
          }
  }