10万パーティクル60FPS(最適化)

これ以上は無理っぽい

by saharan 12 Mar 2011

Embed

/**
 * Copyright saharan ( http://wonderfl.net/user/saharan )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/j9tz
 */

// forked from saharan's forked from: 重力マウス100000パーティクル（更に最適化）
// forked from fumix's 重力マウス（リンクリストにしてみた）
// forked from undo's 重力マウス
//　リンクリストにしてみたけどそんなに速くない？？
//　Math.*を最初以外全部削除。

/*
 * もうちょい最適化＆リファクタリング
 */
package {
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    import flash.geom.ColorTransform;
    import flash.geom.Point;
    import flash.geom.Rectangle;
    import net.hires.debug.Stats;
    [SWF(frameRate="60", width="465", height="465")]
    public class ParticleTest1 extends Sprite {
        private var bmd:BitmapData;
        private var bmdRect:Rectangle;
        private var ctf:ColorTransform;
        private var first:Particle;
        private const maxNum:int = 100000;

        public function ParticleTest1() {
            addEventListener(Event.ADDED_TO_STAGE, init);
        }

        private function init(evt:Event):void {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            var prev:Particle;
            bmd = new BitmapData(465, 465, false, 0x000000);
            ctf = new ColorTransform(0.4, 0.95, 0.7, 1.0);
            bmdRect = bmd.rect;
            addChild(new Bitmap(bmd));
            var debug:Stats = new Stats();
            debug.alpha = 0.8;
            addChild(debug);
            for (var i:int = 0; i < maxNum; i++) {
                var p:Particle = new Particle();
                p.px = Math.random() * 465;
                p.py = Math.random() * 465;
                if (first == null)
                    prev = first = p;
                else {
                    prev.next = p;
                    prev = p;
                }
            }
            addEventListener(Event.ENTER_FRAME, onEnter);
        }

        private function onEnter(evt:Event):void {
            bmd.lock();
            var p:Particle = first;
            const mX:Number = mouseX;
            const mY:Number = mouseY;
            bmd.colorTransform(bmdRect, ctf);
            const pixels:Vector.<uint> = bmd.getVector(bmdRect);
            while(p) {
                const diffX:Number = mX - p.px;
                const diffY:Number = mY - p.py;
                const grav:Number = 50 / (diffX * diffX + diffY * diffY);
                p.px += p.vx = (p.vx + diffX * grav) * 0.96;
                p.py += p.vy = (p.vy + diffY * grav) * 0.96;
                if(p.px > 465)
                    p.px = 0;
                else if(p.px < 0)
                    p.px = 465;
                if(p.py > 465)
                    p.py = 0;
                else if(p.py < 0)
                    p.py = 465;
                const intX:uint = p.px - 0.5;
                const intY:uint = p.py - 0.5;
                pixels[intY * 465 + intX] = 0xffffff;
                p = p.next;
            }
            bmd.setVector(bmdRect, pixels);
            bmd.unlock();
        }
    }
}

class Particle {
    public var vx:Number;
    public var vy:Number;
    public var px:Number;
    public var py:Number;
    public var next:Particle;
    public function Particle() {
        vx = vy = 0;
    }
}