flash on 2010-2-4

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license : MIT License
modified : 2010-02-05 10:22:29

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package {
    import flash.display.MovieClip;
    import flash.events.Event;
    import flash.geom.Point;
    
    [swf(width=465,height=465,backgroundColor=0xffffff,frameRate=30)]
    public class FlashTest extends MovieClip {
    		// 物体の数
    		private const PARTICLE_COUNT:uint = 5;
    		// 物体の半径
    		private const PARTICLE_SIZE:uint = 20;
    		// 物体の質量
    		//private const PARTICLE_MASS:uint = 5;
    		// 重力の設定
    		private const GRAVITY:Number = 0.9;
    		 // 摩擦係数
    		private const FRICTION:Number = 0.7;
    		// ばねの強さ
    		private const SPRING:Number = 0.1;
    		
    		// particle list
    		private var _particles:Array;
    		
        public function FlashTest() {
            // create particles
            _particles = [];
            var initX:Number = mouseX;
            var initY:Number = mouseY;
            for(var i:uint=0;i<PARTICLE_COUNT;i++){
            		_particles.push(new Particle(PARTICLE_SIZE));
            		_particles[i].alpha = 0.7;
            		_particles[i].x = initX;
            		_particles[i].y = initY;
            		addChild(_particles[i]);
            }
            addEventListener(Event.ENTER_FRAME, enterFrameListener);
        }
        private function move(particle:Particle, targetX:Number, targetY:Number):void{
        		// 加速度にスプリング係数を書けて、速度へ加算
        		particle.vx += (targetX - particle.x)*SPRING;
        		particle.vy += (targetY - particle.y)*SPRING;
        		
        		//重力加速度を加算
        		particle.vy += GRAVITY*particle.mass;
        		
        		//速度に摩擦係数を乗算
        		particle.vx *= FRICTION;
        		particle.vy *= FRICTION;
        		
        		// 位置に加算
        		particle.x += particle.vx;
        		particle.y += particle.vy;
        }
        private function enterFrameListener(event:Event):void{
        		graphics.clear();
        		/*graphics.lineStyle(1);
        		//マウスの位置へ移動
        		graphics.moveTo(mouseX, mouseY);
        		//マウスの位置から最初の物体の位置へ線を引く
        		graphics.lineTo(_particles[0].x, _particles[0].y);*/
        		move(_particles[0], mouseX, mouseY);
        		
        		for(var i:uint=1;i<_particles.length;i++){
        			//次の物体の位置へ線を引く
        			//graphics.lineTo(_particles[i].x, _particles[i].y);
        			move(_particles[i], _particles[i-1].x, _particles[i-1].y);     
        		}
        }
    }
}

import flash.display.Graphics;
import flash.display.MovieClip;

class Particle extends MovieClip{
	public var vx:Number = 0;
	public var vy:Number = 0;
	public var mass:Number = 5;
	
	public function Particle(size:Number = 20, mass:Number = 5):void{
		var gr:Graphics = graphics;
		gr.beginFill(0xeeeeee*Math.random()+0x111111,0.9);
		gr.drawCircle(0, 0, size);
	}
}

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