Forked from:: cellfusion's Particle Sample Part2

Particle Sample Part3

大量のパーティクルを発生させてみた
動きの指定方法を模索中
Emitter の初期化時にレンダリングする DisplayObject や、1フレームで追加するパーティクル数やパーティクルの初期化時のステータスおよび update ごとに更新する部分をオブジェクトで指定するようにしてみた

cellfusion

forked:4
favorite:9
lines:207
license : All rights reserved
modified : 2010-02-04 16:19:56

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// forked from cellfusion's Particle Sample Part2
// forked from cellfusion's Particle Sample
// write as3 code here..
// 大量のパーティクルを発生させてみた
// 動きの指定方法を模索中
// Emitter の初期化時にレンダリングする DisplayObject や、1フレームで追加するパーティクル数やパーティクルの初期化時のステータスおよび update ごとに更新する部分をオブジェクトで指定するようにしてみた
package
{
    import flash.display.Sprite;
    import flash.display.StageQuality;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import net.hires.debug.Stats;        
    
    [SWF(width="465", height="465", backgroundColor="0x000000", frameRate="30")]  
	
    public class ParticleSample extends Sprite
    {
        private var _emitter:Emitter;

public function ParticleSample()
        {
            stage.quality = StageQuality.LOW;
            setup();
            addChild(new Stats());
        }
        
        private function setup():void
        {
            _emitter = new Emitter(this, 5,
            {x:0, y:{min:0, max:10}, vx:{min:-1, max:1}, vy:function(p:Particle):Number{ return Math.random() * -10; }, life:{min:5, max:60}}, 
            {
                vx:function(p:Particle):Number { return p.vx + Math.random()*3-1.5; },
                alpha:function(p:Particle):Number { return (p.life - p.count) / p.life; },
                vy:-5
            });
            addChild(_emitter);

addEventListener(Event.ENTER_FRAME, update);
            
            stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDown);
        }
        
        private function update(event:Event):void
        {
            _emitter.update();
        }
        
        private function mouseDown(event:MouseEvent):void
        {
            _emitter.isCreate = true;
            stage.addEventListener(MouseEvent.MOUSE_UP, mouseUp);
        }

private function mouseUp(event:MouseEvent):void
        {
            _emitter.isCreate = false;
            stage.removeEventListener(MouseEvent.MOUSE_UP, mouseUp);
        }
    }
}

import flash.display.GradientType;
import flash.display.SpreadMethod;
import flash.display.Sprite;
import flash.geom.Matrix;

class Emitter extends Sprite
{
    //private var _particles:Vector.<Particle> = new Vector.<Particle>();
    private var _particles:Array = [];
    private var _display:Sprite;
    private var _num:uint;
    private var _init:Object;
    private var _obj:Object;
    private var _isCreate:Boolean;
    
    public var vx:Number = 0;
    public var vy:Number = 0;
    
    public function get isCreate():Boolean { return _isCreate; }
    public function set isCreate(b:Boolean):void { _isCreate = b; }
    
    public function get motionObj():Object { return _obj; }
    public function set motionObj(obj:Object):void { _obj = obj; }

public function Emitter(display:Sprite, num:uint, init:Object, obj:Object)
    {
        _display = display;
        _num = num;
        _init = init;
        _obj = obj;
        _isCreate = false;
        
        for (var i:uint = 0; i < 10000; i++) {
            _particles.push(new Particle());
        }
    }

/**
     * Emitter 自身の位置と particle の位置を更新
     */
    public function update():void
    {
        var dx:Number = root.mouseX - x;
        var dy:Number = root.mouseY - y;
        var d:Number = Math.sqrt(dx*dx+dy*dy) * 0.2;
        var rad:Number = Math.atan2(dy, dx);

vx += Math.cos(rad)*d;
        vy += Math.sin(rad)*d;

vx *= 0.7;
        vy *= 0.7;

x += vx;
        y += vy;
        
        //if (_isCreate) create();
        create();
        
        for each (var p:Particle in _particles) {
            if (!p.destroy) {
                setParticleParam(p, _obj);
                p.update();
            }
        }
    }
    
    private function setParticleParam(p:Particle, obj:Object):void
    {
        for (var name:String in obj) {
            if (obj[name] is Function) {
                p[name] = obj[name](p);
            } else if (obj[name] is Number) {
                p[name] = obj[name];
            } else if (obj[name] is String) {
                p[name] += Number(obj[name]);
            } else {
                if (obj[name].max != null && obj[name].min != null) {
                    p[name] = (obj[name].max - obj[name].min) * Math.random() + obj[name].min;
                }
            }
        }
    }
    
    private function initParticleParam(p:Particle, obj:Object):void
    {
        for (var name:String in obj) {
            if (name == "x" || name == "y") {
                if (obj[name] is Number) {
                    p[name] = this[name] + obj[name];
                } else if (obj[name] is String) {
                    p[name] = this[name] + Number(obj[name]);
                } else if (obj[name] is Function) {
                    p[name] = this[name] + obj[name](p);
                } else {
                    if (obj[name].max != null&& obj[name].min != null) {
                        p[name] = this[name] + (obj[name].max - obj[name].min) * Math.random() + obj[name].min;
                    }
                }
            } else {
                if (obj[name] is Function) {
                    p[name] = obj[name](p);
                } else if (obj[name] is Number) {
                    p[name] = obj[name];
                } else if (obj[name] is String) {
                    p[name] += Number(obj[name]);
                } else {
                    if (obj[name].max != null && obj[name].min != null) {
                        p[name] = (obj[name].max - obj[name].min) * Math.random() + obj[name].min;
                    }
                }
            }
        }
    }
    
    
    /**
     * Particle を生成する
     */
    private function create():void
    {
        var count:uint = 0;
        for each (var p:Particle in _particles) {
            // 停止している Particle を探す
            if (p.destroy) {
                initParticleParam(p, _init);
                p.init();
                _display.addChild(p);
                count++;
            }
            if (count > _num) break;
        }
    }
}

class Particle extends Sprite
{
    public var vx:Number;
    public var vy:Number;
    public var life:Number;
    public var size:Number;

private var _count:uint;
    private var _destroy:Boolean;

public function Particle()
    {
        size = Math.random() * 30;
        
        var red:uint = Math.floor(Math.random()*100+156);
        var blue:uint = Math.floor(Math.random()*100+100);
        var green:uint = Math.floor(Math.random()*156);
        var color:Number = (red << 16) | (green << 8) | (blue);
        
        var fillType:String = GradientType.RADIAL;
        var colors:Array = [color , 0x000000];
        var alphas:Array = [100, 100];
        var ratios:Array = [0x00, 0xFF];
        var mat:Matrix = new Matrix();
        mat.createGradientBox(size * 2, size * 2, 0, -size, -size);
        var spreadMethod:String = SpreadMethod.PAD;

graphics.clear();
        graphics.beginGradientFill(fillType, colors, alphas, ratios, mat, spreadMethod);
        graphics.drawCircle(0, 0, size);
        graphics.endFill();
        
        blendMode = "add";

_destroy = true;
    }
    
    public function get count():uint {
        return _count;
    }
    
    public function init():void
    {
        _count = 0;
        _destroy = false;
    }

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

_count++;
        
        // 死亡フラグ
        if (life < _count) {
            _destroy = true;
            parent.removeChild(this);
        }
    }

public function get destroy():Boolean
    {
        return _destroy;
    }
}

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