forked from: forked from: SPRING WITH HANDLES

Main
メインクラス.

by man_jin111 21 Jul 2011

Tags

physics
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/**
 * Copyright man_jin111 ( http://wonderfl.net/user/man_jin111 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/ihgm
 */

// forked from ekis's forked from: SPRING WITH HANDLES
// forked from kazy's SPRING WITH HANDLES
package {
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    /**
     * Main
     * メインクラス.
     */
    public class Main extends Sprite {
        private var ball:Ball;
        private var handles:Array;
        private var spring:Number = 0.1;
        private var friction:Number = 0.8;
        //ハンドルの数
        private var numHandles:Number = 2;
        /**
         * コンストラクタ.
         */
        public function Main() {
            init();
        }
        /**
         * 初期化.
         */
        private function init():void {
            //ボール生成
            ball = new Ball(20);
            addChild(ball);
                        ball. addEventListener(MouseEvent.MOUSE_DOWN,onPress);
                        ball. addEventListener(MouseEvent.MOUSE_UP,onRelease);
                        ball.buttonMode = true;
            handles = new Array();
            //指定のハンドル数だけ繰り返す
            for (var i:uint = 0; i < numHandles; i++) {
                //ハンドル生成
                var handle:Ball = new Ball(15, 0x666666);
                //初期位置をランダムに
                handle.x = Math.random() * stage.stageWidth;
                handle.y = Math.random() * stage.stageHeight;
                //リスナー登録
                handle.addEventListener(MouseEvent.MOUSE_DOWN, onPress);
                //表示
                addChild(handle);
                //配列に追加
                handles.push(handle);
            }
            addEventListener(Event.ENTER_FRAME, onEnterFrame);
            addEventListener(MouseEvent.MOUSE_UP, onRelease);
        }
        /**
         * onEnterFrame.
         */
        private function onEnterFrame(event:Event):void {
            //ハンドルの数だけ繰り返す
            for (var i:uint = 0; i < numHandles; i++) {
                //ハンドルの参照を設定
                var handle:Ball = handles[i] as Ball;
                var dx:Number = handle.x - ball.x;
                var dy:Number = handle.y - ball.y;
                //ボールにスプリングの加速を加える
                ball.vx += dx * spring;
                ball.vy += dy * spring;
            }
            //減速
            ball.vx *= friction;
            ball.vy *= friction;
            //ボールの座標に適応
            ball.x += ball.vx;
            ball.y += ball.vy;
            //線を描く
            graphics.clear();
            graphics.lineStyle(1);
            for (i = 0; i < numHandles; i++) {
                graphics.moveTo(ball.x, ball.y);
                graphics.lineTo(handles[i].x, handles[i].y);
            }
        }
        /**
         * onPress.
         */
        private function onPress(event:MouseEvent):void {
            //ドラッグ開始
            event.target.startDrag();
        }
        /**
         * onRelease.
         */
        private function onRelease(event:MouseEvent):void {
            //ドラッグ停止
            event.target.stopDrag();
        }
    }
}



/**
 * Ball
 * ボール生成クラス.
 */
class Ball extends flash.display.Sprite {
    public var radius:Number;
    private var color:uint;
    public var vx:Number = 0;
    public var vy:Number = 0;
    /**
     * コンストラクタ.
     */
    public function Ball(radius:Number=40, color:uint=0x990033) {
        this.radius = radius;
        this.color = color;
        init();
    }
    /**
     * 初期化.
     */
    public function init():void {
        graphics.beginFill(color);
        graphics.drawCircle(0, 0, radius);
        graphics.endFill();
    }
}