flash on 2009-2-16

...
flashの超基礎的なサンプル

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license : All rights reserved
modified : 2009-02-16 17:41:01

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package {
   import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	
	/**
	 * ...
	 * flashの超基礎的なサンプル
	 */
	public class BoundBall extends Sprite
	{
		private var vy:Number = 0;
		private var vx:Number = 0;
		private var tempX:Number = 0;
		private var tempY:Number = 0;
		private const g:Number = 0.98;
		private const diameter:int = 50;
		private var ball:Sprite;
		public function BoundBall() 
		{
			createObject();
			addEventListener(Event.ENTER_FRAME,loopHandler);
		}
		private function createObject():void {
			ball = new Sprite();
			ball.x = stage.stageWidth / 2;
			ball.y = stage.stageHeight / 2;
			ball.graphics.beginFill(0xff0000);
			ball.graphics.drawCircle(0, 0, diameter);
			ball.graphics.endFill();
			addChild(ball);
			ball.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
			ball.addEventListener(MouseEvent.MOUSE_UP,mouseUpHandler);
		}
		private function loopHandler(e:Event):void {
			ball.x += vx;
			ball.y += vy;
			hitWall();
			vy += g;
		}
		private function dragHandler(e:Event):void {
			tempX = mouseX;
			tempY = mouseY;
		}
		private function hitWall():void {
			if (diameter > ball.x) {
				ball.x = diameter;
				vx *= -0.5;
			}
			else if (stage.stageWidth < ball.x + diameter) {
				ball.x = stage.stageWidth - diameter;
				vx *= -0.5;
			}
			if (ball.y < diameter) {
				ball.y = diameter;
				vy *= -0.5;
                                     vx *= 0.98;
			}
			else if (stage.stageHeight < ball.y + diameter) {
				ball.y = stage.stageHeight - diameter;
				vy *= -0.5;
                                    vx *= 0.98;
			}
		}
		private function mouseDownHandler(e:MouseEvent):void {
			vx = 0;
			vy = 0;
			removeEventListener(Event.ENTER_FRAME, loopHandler);
			addEventListener(Event.ENTER_FRAME, dragHandler);
			ball.startDrag();
		}
		private function mouseUpHandler(e:MouseEvent):void {
			vx = mouseX - tempX;
			vy = mouseY - tempY;
			removeEventListener(Event.ENTER_FRAME, dragHandler);
			addEventListener(Event.ENTER_FRAME, loopHandler);
			ball.stopDrag();
		}
	}
}

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