flash on 2010-11-21

/**
 * Copyright aruerula ( http://wonderfl.net/user/aruerula )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/1bYS
 */

package  
{
    //http://d.hatena.ne.jp/ActionScript/20090412/as3_math_sin_cos#
    
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.events.TextEvent;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.text.TextFormat;
    
    [SWF(width = 465, height = 465, backgroundColor = 0xffffff, frameRate = 30)]
    
    public class Main extends Sprite 
    {
        private var _scx:Number;
        private var _scy:Number;
        
        private var _angle:Number = 0; // 角度
        private var _change:Number = 1; // 増やす角度
        private var _radius:Number = 150; // 半径
        private var _ball:Sprite;
        private var _gsp:Sprite; // ガイド
        private var _tf:TextField;
        
        private var _flag:Boolean = true;
        
        public function Main():void 
        {
            _scx = stage.stageWidth * 0.5;
            _scy = stage.stageHeight * 0.5;
            
            setup();
            
            this.stage.addEventListener(Event.ENTER_FRAME, draw);
            this.stage.addEventListener(MouseEvent.CLICK, goAndStop);
        }
        
        private function setup():void
        {
            var circle:Sprite = new Sprite();
            circle.graphics.lineStyle(1, 0x0, 1);
            circle.graphics.drawCircle(0, 0, _radius);
            circle.graphics.beginFill(0x0, 1);
            circle.graphics.drawCircle(0, 0, 3);
            circle.graphics.endFill();
            circle.x = _scx;
            circle.y = _scy;
            circle.alpha = 0.3;
            this.stage.addChild(circle);
            
            var line:Sprite = new Sprite();
            line.graphics.lineStyle(1, 0x0, 1);
            line.graphics.moveTo(_scx, 0);
            line.graphics.lineTo(_scx, stage.stageHeight);
            line.graphics.moveTo(0, _scy);
            line.graphics.lineTo(stage.stageWidth, _scy);
            line.alpha = 0.3;
            this.stage.addChild(line);
            
            _ball = new Sprite();
            _ball.graphics.beginFill(0x336699, 0.7);
            _ball.graphics.drawCircle(0, 0, 7);
            _ball.graphics.endFill();
            _ball.x = _scx + _radius;
            _ball.y = _scy;
            this.stage.addChild(_ball);
            
            _gsp = new Sprite();
            this.stage.addChild(_gsp);
            
            var tfmt:TextFormat = new TextFormat("Arial", 12, 0x0);
            _tf = new TextField();
            _tf.defaultTextFormat = tfmt;
            _tf.autoSize = TextFieldAutoSize.LEFT;
            this.stage.addChild(_tf);
        }
        
        private function goAndStop(event:MouseEvent):void 
        {
            
            if (_flag)
            {
                this.stage.removeEventListener(Event.ENTER_FRAME, draw);
            } else 
            {
                this.stage.addEventListener(Event.ENTER_FRAME, draw);
            }
            
            _flag = !_flag;
        }
        
        private function draw(event:Event):void 
        {
            // 円運動の計算
            var radian:Number = _angle * Math.PI / 180; // 度をラジアンに変換
            _ball.x = _scx + _radius * Math.cos(radian);
            _ball.y = _scy + _radius * Math.sin(radian);
            _angle += _change;
            _angle %= 360;
            
            // 以下ガイドの描画
            _gsp.graphics.clear();
            
            // 斜辺(半径)
            _gsp.graphics.lineStyle(2, 0x00ff00, 1);
            _gsp.graphics.moveTo(_scx, _scy);
            _gsp.graphics.lineTo(_ball.x, _ball.y);
            
            // 対辺
            _gsp.graphics.lineStyle(2, 0xff0000, 1);
            _gsp.graphics.moveTo(_ball.x, _ball.y);
            _gsp.graphics.lineTo(_ball.x, _scy);
            
            // 隣辺
            _gsp.graphics.lineStyle(2, 0x0000ff, 1);
            _gsp.graphics.moveTo(_ball.x, _scx);
            _gsp.graphics.lineTo(_scx, _scy);
            
            // 数値表示
            _tf.text = "画面クリックで再生/停止\n\n"
                     + "角度: " + _angle + "\n"
                     + "隣辺: " + _radius * Math.cos(radian) + " px\n"
                     + "対辺: " + _radius * Math.sin(radian) + " px\n\n"
                     + "ラジアン: " + radian + "\n"
                     + "コサイン: " + Math.cos(radian) + "\n"
                     + "サイン: " + Math.sin(radian) + "\n\n"
                     + "半径: " + _radius + " px\n";
        }
        
    }
    
}