バネ運動をつなげる

by _wonder 21 May 2010

Embed

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

// forked from _wonder's バネ運動
// forked from _wonder's base
package {
    import flash.display.Sprite;
    import flash.events.Event;
    
    public class Spring extends Sprite {
    		private var ball0:Ball;
    		private var ball1:Ball;
    		private var ball2:Ball;
    		private var spring:Number = 0.1;
    		private var friction:Number = 0.8;
    		private var gravity:Number = 5;
    		
    		public function Spring() {
            init();
        }
        
        private function init():void {
        		ball0 = new Ball(20);
        		addChild( ball0 );
        		ball1 = new Ball(20);
        		addChild( ball1 );
        		ball2 = new Ball(20);
        		addChild( ball2 );
        		addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
        
        private function onEnterFrame(e:Event):void {
        		moveBall(ball0, mouseX, mouseY);
        		moveBall(ball1, ball0.x, ball0.y);
        		moveBall(ball2, ball1.x, ball1.y);
        		graphics.clear();
        		graphics.lineStyle(1);
        		graphics.moveTo(mouseX, mouseY);
        		graphics.lineTo(ball0.x, ball0.y);
        		graphics.lineTo(ball1.x, ball1.y);
        		graphics.lineTo(ball2.x, ball2.y);
        }
        
        private function moveBall(ball:Ball, targetX:Number, targetY:Number):void {
        		ball.vx += (targetX - ball.x) * spring;
        		ball.vy += (targetY - ball.y) * spring;
        		ball.vy += gravity;
        		ball.vx *= friction;
        		ball.vy *= friction;
        		ball.x += ball.vx;
        		ball.y += ball.vy;
        }
    }
}

import flash.display.Sprite;

class Ball extends Sprite {
	public var radius:Number;
	public var color:uint;
	public var vx:Number = 0;
	public var vy:Number = 0;
	
	public function Ball(radius:Number=40, color:uint=0Xff0000){
		this.radius = radius;
		this.color = color;
		init();
	}
	
	public function init():void {
		graphics.beginFill(color);
		graphics.drawCircle(0, 0, radius);
		graphics.endFill();
	}
}