package {
    import flash.display.*;
    import flash.geom.*;
    import flash.text.*;
    import flash.events.*;
    public class FlashTest extends Sprite {
        private var screen:BitmapData;
        private const W:int = 465, H:int = 465;
        private var ba:Number, bv:Number;
        private var cnt:int, noColCnt:int;
        private var running:Boolean;
        private var ball:Shape = new Shape();
        private var wall:Shape = new Shape();
        private var score:TextField;
        private var text:TextField;
        private function makeTextField(x:int, y:int, s:int):TextField {
            var t:TextField = new TextField();
            t.x = x;
            t.y = y;
            t.width = W;
            t.height = H;
            var fm:TextFormat = new TextFormat;
            fm.color = 0xffffff;
            fm.font = '_typewriter';
            fm.size = s;
            fm.bold = true;
            t.defaultTextFormat = fm;
            return t;
        }
        public function FlashTest() {
            this.addEventListener(Event.ENTER_FRAME, update);
            screen = new BitmapData(W, H, false, 0);
            addChild(new Bitmap(screen));
            ball.graphics.beginFill(0xffffff);
            ball.graphics.drawCircle(0, 0, 7);
            addChild(ball);
            wall.graphics.beginFill(0xffffff);
            wall.graphics.drawRect(-25, -2, 50, 5);
            addChild(wall);
            addChild(score = makeTextField(10, 10, 20));
            score.text = '0';
            addChild(text = makeTextField(110, 200, 30));
            stage.addEventListener(MouseEvent.CLICK, init);
            ball.x = -20;
            running = true;
        }
        public function init(event:MouseEvent): void {
            if (running) return;
            running = true;
            bv = 2;
            ba = 0;
            ball.x = W / 2;
            ball.y = H / 2;
            score.text = '' + (cnt = 0);
            text.text = '';
        }
        public function update(event:Event): void {
            var a:Number = Math.atan2(stage.mouseX - W / 2,
                                      stage.mouseY - H / 2);
            var bx:Number = ball.x - W / 2;
            var by:Number = ball.y - H / 2;
            var da:Number = Math.abs(Math.atan2(bx, by) - a);
            if ((noColCnt -= 1) < 0 &&
                (da < 0.2 || da > Math.PI * 2 - 0.2) &&
                Math.abs(Math.sqrt(bx*bx + by*by) - 200) < 10) {
                ba = Math.PI - ba + a * 2;
                bv += 0.3;
                score.text = '' + (cnt += 1);
                noColCnt = 10;
            }
            wall.rotation = - a / 3.141592 * 180;
            ball.x += bv * Math.sin(ba);
            ball.y += bv * Math.cos(ba);
            wall.x = W / 2 + Math.sin(a) * 200;
            wall.y = H / 2 + Math.cos(a) * 200;
            if ((ball.x < 0 || ball.x > W ||
                 ball.y < 0 || ball.y > H) && running) {
                text.text = '  GAME OVER\nCLICK TO START';
                running = false;
            }
        }
    }
}

circle pong