自己計測するパーティクル

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favorite:12
lines:67
license : MIT License
modified : 2010-03-10 21:09:09

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package {
    import flash.display.Sprite;
    import flash.events.Event;
    
    [SWF(backgroundColor="0x0")]
    public class FlashTest extends Sprite {
    		private var _particles:Array;
        public function FlashTest() {
            // write as3 code here..
            
            _particles = [];
            for (var i:int = 0; i < 100; i++)
            {
            		var p:Particle = new Particle();
            		_particles.push(p);
            		addChild(p);
            }
            
            addEventListener(Event.ENTER_FRAME, loop);
        }
        
        private function loop(e:Event):void
        {
        		for (var i:int = 0; i < 100; i++)
        		{
        			var p:Particle = _particles[i];
        			p.update();
        			if (p.x > 465 || p.x < -60)
        			{
        				p.init();
        				this.setChildIndex(p, 0);
        			}
        			if (p.y > 465 || p.y < -80)
        			{
        				p.init();
        				this.setChildIndex(p, 0);
        			}
        		}
        }
    }
}

import net.hires.debug.Stats;

class Particle extends Stats
{
	private var _x0:Number;
	private var _y0:Number;
	private var _theta0:Number;
	private var _theta:Number;
	
	public function Particle()
	{
		super();
		_x0 =200;
		_y0 =180;
		_theta0 = 2 * Math.PI * Math.random();
		_theta = 2.5 * Math.random();
	}
	public function update():void
	{
		_theta += 0.01;
		var r:Number = _theta * 10;
		r *= r;
		x = _x0 + r * Math.cos(_theta + _theta0);
		y = _y0 + r * Math.sin(_theta + _theta0);
	}
	public function init():void
	{
		x = _x0;
		y = _y0;
		_theta = 0;
		_theta0 = 2 * Math.PI * Math.random();
	}
}

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