forked from: forked from: 重力マウス

by hacker_5wqxxhjd 27 Jul 2010

Embed

/**
 * Copyright hacker_5wqxxhjd ( http://wonderfl.net/user/hacker_5wqxxhjd )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/43gZ
 */

// forked from hacker_5wqxxhjd's forked from: 重力マウス
// forked from undo's 重力マウス
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;

    [SWF(frameRate='60', width='1920', height='1080', backgroundColor='0x0')]

    public class ParticleTest1 extends Sprite
    {
        private var _bmp:Bitmap;
        private var _bmd:BitmapData;
        private var _bmdRect:Rectangle;
        private var _colorTransform:ColorTransform = new ColorTransform(0, 0.9, 0.6, 0.9);

        private var _nodeArray:Array = [];
        private var _maxNum:int = 10000;

        public function ParticleTest1()
        {
            this.stage.align = StageAlign.TOP_LEFT;
            this.stage.scaleMode = StageScaleMode.NO_SCALE;

            addEventListener(Event.ADDED_TO_STAGE, init);
        }

        private function init(evt:Event):void
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);

            _bmd = new BitmapData(465, 465, false, 0x000000);
            _bmp = new Bitmap(_bmd);
            addChild(_bmp);
            this._bmdRect = new Rectangle(0, 0, 465, 465);

            for (var i:int = 0; i < this._maxNum; i++)
            {
                var n:Node = new Node();
                n.pos.x = Math.random() * 640;
                n.pos.y = Math.random() * 640;
                this._nodeArray.push(n);
            }

            addEventListener(Event.ENTER_FRAME, onEnter);
        }

        private function onEnter(evt:Event):void
        {
            var gravPoint:Point = new Point(mouseX, mouseY);
            for (var i:int = 0; i < this._maxNum; i++)
            {
                var n:Node = this._nodeArray[i] as Node;
                var diff:Point = new Point(gravPoint.x - n.pos.x, gravPoint.y - n.pos.y);
                var rad:Number = Math.atan2(diff.y, diff.x);
                var grav:Number = 10 / Math.sqrt(diff.x * diff.x + diff.y * diff.y);
                n.acc.x = (Math.cos(rad) * grav);
                n.acc.y = (Math.sin(rad) * grav);
                n.v.x += n.acc.x;
                n.v.y += n.acc.y;
                n.pos.x += n.v.x;
                n.pos.y += n.v.y;

                n.acc.x *= 0.98;
                n.acc.y *= 0.98;
                n.v.x *= 0.96;
                n.v.y *= 0.96;

                if (n.pos.x > 465)
                    n.pos.x = 0;
                else if (n.pos.x < 0)
                    n.pos.x = 465;
                if (n.pos.y > 465)
                    n.pos.y = 0;
                else if (n.pos.y < 0)
                    n.pos.y = 465;

                this._bmd.fillRect(new Rectangle(n.pos.x, n.pos.y, 1, 1), 0xffffff);
            }

            this._bmd.colorTransform(this._bmdRect, this._colorTransform);
        }
    }
}

import flash.geom.Point;

class Node
{
    public var acc:Point;
    public var v:Point;
    public var pos:Point;

    public function Node()
    {
        this.acc = new Point();
        this.v = new Point();
        this.pos = new Point();
    }
}