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Particle part2

パーティクルが必要になったのでざっくり作ってみた。
まだ途中。

ドラッグ中にぱーってっくるー

part2
回転とかアルファとか大きさとか
眠いのでいろいろてっけとー
ちょっと重くなった


こちらを参考に作らせていただきました。

パーティクルクラスを作ってみた |5ive™.blog
http://www.5ive.info/blog/archives/78
Get Adobe Flash player
by ll_koba_ll 16 Feb 2009
// forked from ll_koba_ll's Particle part1
/*
パーティクルが必要になったのでざっくり作ってみた。
まだ途中。

ドラッグ中にぱーってっくるー

part2
回転とかアルファとか大きさとか
眠いのでいろいろてっけとー
ちょっと重くなった


こちらを参考に作らせていただきました。

パーティクルクラスを作ってみた |5ive™.blog
http://www.5ive.info/blog/archives/78

*/

package
{

    import flash.display.*;
    import flash.events.*;
    import flash.system.*;
    import net.hires.debug.Stats;
    
    [SWF(frameRate="30", backgroundColor="#000000")]
     public class ParticlesTest extends Sprite
    {

        private var pr:ParticleRender;
        private var mouseDown:Boolean = false;

		public function ParticlesTest()
        {
            addEventListener(Event.ADDED_TO_STAGE, init);
		}

        private function init(e:Event):void
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            stage.align = StageAlign.TOP_LEFT;
            stage.quality = StageQuality.HIGH;
            stage.scaleMode = StageScaleMode.NO_SCALE;
            
            var sp:Sprite = new Sprite();
            with(sp.graphics)
            {
                beginFill(0xFFFFFF);
                //drawCircle(0,0,10);
                drawRect(0, 0, 20, 10);
                endFill();
            }

            // ここでパーティクルの設定もろもろ
            pr = new ParticleRender(500, 500, 5, 4, 5, sp);
            pr.gravity = -1;
            pr.wind = 0;
            pr.vrotation = 10;
            pr.valpha = -0.03;
            pr.vscale = -0.01;
        
            addChild(pr);
            
            stage.addEventListener(MouseEvent.MOUSE_DOWN, down);
            stage.addEventListener(MouseEvent.MOUSE_UP, up);
            addEventListener(Event.ENTER_FRAME, enterFrame);
            addChild(new Stats());
        }

        private function down(e:MouseEvent):void
        {
            mouseDown = true;
        }

        private function up(e:MouseEvent):void
        {
            mouseDown = false;
        }
        
        private function enterFrame(e:Event):void
        {
            if (mouseDown) pr.start(mouseX, mouseY);
        }
        
	}
}

import flash.display.*;
import flash.utils.Timer;
import flash.events.*;
import flash.geom.*;


class ParticleRender extends Sprite
{
    private var _canvas:BitmapData;
    private var _particleNum:int
    private var _particles:Array;
    private var _view:DisplayObjectContainer;
    private var _vx:Number;
    private var _vy:Number;

    private var _gravity:Number;
    public function get gravity():Number { return _gravity; }
    public function set gravity(value:Number):void { _gravity = value; }
    
    private var _wind:Number;
    public function get wind():Number { return _wind; }
    public function set wind(value:Number):void { _wind = value; }
    
    private var _vrotation:Number;
    public function get vrotation():Number { return _vrotation; }
    public function set vrotation(value:Number):void { _vrotation = value; }

    private var _valpha:Number
    public function get valpha():Number { return _valpha; }
    public function set valpha(value:Number):void { _valpha = value; }

    private var _vscale:Number;
    public function get vscale():Number { return _vscale; }
    public function set vscale(value:Number):void { _vscale = value; }
    
    private var _lifeTime:Number;

    /**
     * @param w canvas width
     * @param h canvas height
     * @param vx max speed x
     * @param vy max speed y
     * @param particleNum paritcle number
     * @param view particle view
     * @param gravity
     * @param wind
     * @param vrotation vx vyと同じでmaxとしてランダム+-
     * @param valpha renderで加算
     * @param vscale renderで加算
     */
    public function ParticleRender(w:Number, 
                                   h:Number, 
                                   vx:Number,
                                   vy:Number,
                                   particleNum:int,
                                   view:DisplayObjectContainer,
                                   gravity:Number = 0,
                                   wind:Number = 0,
                                   vrotation:Number = 0,
                                   valpha:Number = 0,
                                   vscale:Number = 0
                                   ):void
    {

        _canvas = new BitmapData(w,h,true,0x00FFFFFF);
        addChild(new Bitmap(_canvas));
        _particleNum = particleNum;
        _gravity = gravity;
        _wind = wind;
        _particles = [];
        _view = view;
        _vx = vx;
        _vy = vy;
        _vrotation = rotation;
        _valpha = 0;
        _vscale = 0;

        addEventListener(Event.ENTER_FRAME, update);
        
    }

    public function start(x:Number = 0, y:Number = 0):void
    {
        var tmp:Particle;
        for (var i:int =0; i<_particleNum; i++)
        {
            tmp = new Particle();
            tmp.vx = randomRange(-_vx, _vx);
            tmp.vy = randomRange(-_vy, _vy);
            tmp.x = x;
            tmp.y = y;
            tmp.rotation = randomRange(-_vrotation, _vrotation);
            _particles.push(tmp);
        }
    }

    public function stop():void
    {

    }
    
    private function update(e:Event):void
    {
        _canvas.lock();
        _canvas.fillRect(this._canvas.rect, 0x00FFFFFF);
        var mtx:Matrix;
        var ct:ColorTransform;
        var p:Particle;
        var l:int = _particles.length;

        for (var i:int = 0; i<l; i++)
        {
            p = _particles[i];
            p.update();
            p.vy += _gravity*0.1;
            p.vx += _wind*0.1;
            p.scale = (p.scale <= 0)? 0:p.scale+_vscale;
            p.alpha += _valpha;
            //_view.alpha = p.alpha;
            mtx = new Matrix();
            mtx.scale(p.scale, p.scale);
            mtx.rotate(p.rotation);
            mtx.translate(p.x, p.y);
            ct = new ColorTransform();
            ct.alphaMultiplier = p.alpha;
            _canvas.draw(_view, mtx, ct);
            
            if (p.x < 0 || p.x > _canvas.width ||
                p.y < 0 || p.y > _canvas.height)
            {
                _particles[i] = null;
                _particles.splice(i, 1);
                l = _particles.length;
                i--;
            }
        }

        _canvas.unlock();

    }

    private function randomRange(min:Number, max:Number):Number
    {
        return (Math.random() * (max - min)) + min;
    }    
}

class Particle
{
    public var x:Number;
    public var y:Number;
    public var vx:Number;
    public var vy:Number;
    public var rotation:Number;
    public var alpha:Number;
    public var scale:Number;
    public var lifetime:Number;

    public function Particle()
    {
        alpha = 1;
        scale = 1;
    }

    public function update():void
    {
        x += vx;
        y += vy;
    }
    
}