Forked from:: siba2260's 爆発エフェクト（クリックしたとこで爆発します）

forked from: 爆発エフェクト（クリックしたとこで爆発します）

爆発のエフェクト。
@author SIBA

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lines:110
license : All rights reserved
modified : 2011-01-29 23:56:15

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// forked from siba2260's 爆発エフェクト（クリックしたとこで爆発します）
// write as3 code here..
package {
    import flash.display.DisplayObject;
    import flash.display.Sprite;
    import flash.events.MouseEvent;
    
    [SWF(width=800, height=600, backgroundColor=0xAADDFF)]

/**
     * 爆発のエフェクト。
     * @author SIBA
     */
    public class Main04 extends Sprite {
        
        public function Main04() {
            stage.addEventListener(MouseEvent.CLICK, onClick);
        }
        
        private function onClick(event:MouseEvent):void {
            var burst:Burst = new Burst();
            burst.x = event.stageX - burst.width/2;
            burst.y = event.stageY - burst.height/2;
            addChild(burst);
            
            burst.addEventListener(BurstEvent.COMPLETE, onFinishBurst);
        }
        
        private function onFinishBurst(event:BurstEvent):void {
            removeChild(event.currentTarget as DisplayObject);
                        event.currentTarget.removeEventListener(BurstEvent.COMPLETE, onFinishBurst);
        }
        
    }
}

import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Sprite;
import flash.display.Graphics;
import flash.filters.BlurFilter;
import flash.events.Event;
import flash.geom.ColorTransform;
import flash.geom.Matrix;
import flash.display.BlendMode;

class Burst extends Bitmap {
    
    private var particleDesign:Sprite = new Sprite();
    private var particleList:Array = [];
    
    public function Burst() {
        var tempBmp:BitmapData = new BitmapData(200, 200, true, 0x00000000);
        super(tempBmp);
        
        // パーティクルのデザインを作成する
        createParticleDesign();
        
        // パーティクルを作成する
        createParticle();
        
        addEventListener(Event.ENTER_FRAME, onEnterFrame);
    }
    
    private function createParticleDesign():void {
        // 円を描く
        const g:Graphics = particleDesign.graphics;
        g.beginFill(0xFF8022, 0.5);
        g.drawCircle(0, 0, 10);
        g.endFill();
        
        // ぼかし効果を適用する
        particleDesign.filters = [new BlurFilter(10, 10, 1)];
    }
    
    private function createParticle():void {
        for (var i:int=0; i<50; i++) {
            var x:int = bitmapData.width/2;
            var y:int = bitmapData.height/2;
            var v:Number = Math.random()*5;
            var angle:uint = Math.random()*360;
            var ax:Number = 0;
            var ay:Number = 0;
            var enagy:Number = 1;
            var particle:Particle = new Particle(x, y, v, angle, ax, ay, enagy);
            particleList[particleList.length] = particle;
        }
    }
    
    private function onEnterFrame(event:Event):void {
        bitmapData.colorTransform(bitmapData.rect, new ColorTransform(1, 1, 1, 1, 0, 0, 0, -32));
        for (var i:int=particleList.length-1; i>-1; i--) {
            var particle:Particle = Particle(particleList[i]);
            particle.move();
            var mat:Matrix = new Matrix();
            mat.translate(particle.x, particle.y);
            bitmapData.draw(particleDesign, mat, new ColorTransform(1, 1, 1, particle.enagy), BlendMode.ADD);
            if (particle.enagy < 0.01) {
                particleList.splice(i, 1);
            }
        }
                if (particleList.length <= 0) {
            removeEventListener(Event.ENTER_FRAME, onEnterFrame);
            dispatchEvent(new BurstEvent(BurstEvent.COMPLETE));
        }
    }
    
}

class BurstEvent extends Event {
    
    public static const COMPLETE:String = "complete";
    
    public function BurstEvent(type:String) {
        super(type);
    }
}

class Particle {
    
    public var x:Number;
    public var y:Number;
    private var vx:Number;
    private var vy:Number;
    private var ax:Number;
    private var ay:Number
    public var enagy:Number;
    
    public function Particle(x:int, y:int, v:Number, angle:uint, ax:Number, ay:Number, enagy:Number) {
        this.x = x;
        this.y = y;
        this.vx = Math.cos(angle*Math.PI/180) * v;
        this.vy = Math.sin(angle*Math.PI/180) * v;
        this.ax = ax;
        this.ay = ay;
        this.enagy = enagy;
    }
    
    public function move():void {
        x += vx;
        y += vy;
        
        vx += ax;
        vy += ay;
        
        enagy *= 0.9;
    }
    
}

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