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ActionScript

/*
from http://wonderfl.net/c/dHyt/
ソース見難くてすいません。
インデントつけたらエラーになったもので・・・。
↓
2009/07/31 22:56 修正
コメントアウトを手当たり次第に消していったらインデントできました。
原因はコメントアウトなのかな？以降気をつけます。
*/
package {
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.BlendMode;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.TimerEvent;
    import flash.filters.BlurFilter;
    import flash.geom.ColorTransform;
    import flash.geom.Matrix;
    import flash.geom.Point;
    import flash.geom.Rectangle;
    import flash.utils.Timer;
    [SWF(width = "480", height = "480", frameRate = "60")];
    public class Main extends Sprite {
        private const SEGMENT:uint = 10;
        private const COUNT:uint = 30;
        private const MAGNIFICATION:Number = 1.05;
        private var _canvas:BitmapData;
        private var _drawField:BitmapData;
        private var _bm:Bitmap;
        private var _container:Sprite;
        private var _bezierPointList:/*BezierPoint*/Array = [];
        private var _pointList:/*SimplePoint*/Array = [];
        private var _colorList:/*uint*/Array = [];

public function Main():void {
            addEventListener(Event.ADDED_TO_STAGE, _init);
        }
        private function _init(e:Event = null):void {
            for (var i:int = 0; i < COUNT; i++) {
                var bp:BezierPoint = new BezierPoint();
                _layout(bp, i / COUNT);
                bp.saveDefault();
                _bezierPointList[i] = bp;
            }
            _canvas = new BitmapData(480, 480, false, 0x000000);
            addChild(new Bitmap(_canvas));
            _container = new Sprite();
            addEventListener(Event.ENTER_FRAME, _onEnterFrameHandler);
            var timer:Timer = new Timer(1000, 0);
            timer.addEventListener(TimerEvent.TIMER, _onTimerHandler);
            timer.start();
            _onTimerHandler();
        }
        private function _layout(bp:BezierPoint, percent:Number):void {
            var r:Number = 50;
            var h:Number = 10;
            var rad:Number = 2 * Math.PI * percent;
            bp.x = r * Math.cos(rad) + 240;
            bp.y = r * Math.sin(rad) + 240;
            bp.inPoint = new SimplePoint(h * Math.cos(Math.PI * 0.5 + rad) + bp.x, h * Math.sin(Math.PI * 0.5 + rad) + bp.y);
        }
        private function _drawBezier(arr:Array):void {
            _container.graphics.clear();
            _container.graphics.lineStyle(2, 0xFFFFFF, 1);
            _container.graphics.moveTo(arr[0].x, arr[0].y);
            for (var i:int = 1; i < arr.length; i++) {
                _container.graphics.lineTo(arr[i].x, arr[i].y);
            }
        }
        public function _lineTo(p0:BezierPoint, p1:BezierPoint):void {
            var bezierSegment:BezierSegment = new BezierSegment(p0.ancherPont, p0.inPoint, p1.outPoint, p1.ancherPont);
            _pointList.push(p0.ancherPont);
            for (var i:int = 0; i < SEGMENT; i++) {
                _pointList.push(bezierSegment.getValue(1 / SEGMENT * i));
            }
            _pointList.push(p1.ancherPont);
        }
        private function _draw():void {
            for (var i:int = 0; i < _bezierPointList.length-1; i++) {
                _lineTo(_bezierPointList[i], _bezierPointList[i+1]);
            }
            _lineTo(_bezierPointList[_bezierPointList.length - 1], _bezierPointList[0]);

_drawBezier(_pointList);
            _pointList = [];

_drawField.draw(_container);
        }
        private function _fade():void {
            var mat:Matrix = new Matrix();
            mat.translate( -240, -240);
            mat.scale(MAGNIFICATION, MAGNIFICATION);
            mat.rotate(0.03);
            mat.translate(240, 240);
            _canvas.draw(_drawField, mat);
            _canvas.applyFilter(_canvas, _canvas.rect, new Point(), new BlurFilter(7, 7, 1));
            _canvas.colorTransform(_canvas.rect, new ColorTransform(1, 1, 1, 1, _colorList[0], _colorList[1], _colorList[2], 0) );
            var curtain:BitmapData = new BitmapData(480, 480, true, 0x01000000);
            _canvas.draw(curtain);
        }
        private function _move():void {
            for (var i:int = 0; i < _bezierPointList.length; i++) {
                BezierPoint(_bezierPointList[i]).move();
            }
        }
        private function _onEnterFrameHandler(e:Event = null):void {
            if (_drawField) {
                _drawField.dispose();
            }
            _drawField = _canvas.clone();

_move();
            _draw();
            _fade();
        }
        private function _onTimerHandler(e:TimerEvent = null):void {
            var h:Number = -7;
            var b:Number = -0.5;
            _colorList = [ h * Math.random() +b,h * Math.random() +b, h * Math.random() +b];
        }
    }
}
class BezierPoint {
    private var _controllR:Number = 100;
    private var _anchorR:Number = 10;

private var _controllRad:Number = 0;
    private var _anchorRad:Number = 0;

private var _controllDefaultPoint:SimplePoint;
    private var _anchorDefaultPoint:SimplePoint;

private var _aP:SimplePoint;
    private var _cP0:SimplePoint;
    private var _cP1:SimplePoint;

private var _x:Number;
    private var _y:Number;

public function BezierPoint() {
        _init();
    }
    private function _init():void {
        _aP = new SimplePoint();
        _cP0 = new SimplePoint();
        _cP1 = new SimplePoint();
        _controllRad = 2 * Math.PI * Math.random();
        _anchorRad = 2 * Math.PI * Math.random();
    }
    private function _moveControll(controllPoint:SimplePoint):void {
        var targetPoint:SimplePoint = (controllPoint == _cP0) ? _cP1 : _cP0;

targetPoint.x = _aP.x * 2 - controllPoint.x;
        targetPoint.y = _aP.y * 2 - controllPoint.y;
    }
    public function saveDefault():void {
        _controllDefaultPoint = new SimplePoint(inPoint.x, inPoint.y);
        _anchorDefaultPoint = new SimplePoint(x, y);
    }
    public function move():void {
        var speed:Number = 0.05 + 0.1 * Math.random();

_controllRad = (_controllRad + speed) % (2 * Math.PI);
        _anchorRad = (_anchorRad + speed) % (2 * Math.PI);

inPoint.x = _controllR * Math.cos(_controllRad) +_controllDefaultPoint.x;
        inPoint.y = _controllR * Math.sin(_anchorRad) +_controllDefaultPoint.y;
        x = _anchorR * Math.cos(_anchorRad) +_anchorDefaultPoint.x;
        y = _anchorR * Math.sin(_controllRad) +_anchorDefaultPoint.y;
    }
    public function get inPoint():SimplePoint {
        return new SimplePoint(_cP0.x + x,_cP0.y + y);
    }
    public function set inPoint(value:SimplePoint):void {
        _cP0.x = value.x - x;
        _cP0.y = value.y - y;
        _moveControll(_cP0);
    }
    public function get outPoint():SimplePoint {
        return new SimplePoint(_cP1.x + x,_cP1.y + y);
    }
    public function set outPoint(value:SimplePoint):void {
        _cP1.x = value.x - x;
        _cP1.y = value.y - y;
        _moveControll(_cP1);
    }
    public function get ancherPont():SimplePoint {
        return new SimplePoint(x,y);
    }

public function get x():Number {
        return _x;
    }
    public function set x(value:Number):void {
        _x = value;
    }
    public function get y():Number {
        return _y;
    }
    public function set y(value:Number):void {
        _y = value;
    }
}
class BezierSegment {
    private var _anchor0:SimplePoint;
    private var _anchor1:SimplePoint;
    private var _controll0:SimplePoint;
    private var _controll1:SimplePoint;
    public function BezierSegment(anchor0:SimplePoint, controll0:SimplePoint, controll1:SimplePoint, anchor1:SimplePoint) {
        _anchor0 = anchor0;
        _anchor1 = anchor1;
        _controll0 = controll0;
        _controll1 = controll1;
    }
    public function getValue(per:Number):SimplePoint {
        if (per < 0 || 1 < per) {
            throw new Error(' 0≦per≦1でお願いしますm(_ _;)m');
        }
        var p:Number = 1 - per;
        return new SimplePoint(p * p * p * _anchor0.x + 3 * p * p * per * _controll0.x + 3 * p * per * per * _controll1.x + per * per * per * _anchor1.x,p * p * p * _anchor0.y + 3 * p * p * per * _controll0.y + 3 * p * per * per * _controll1.y + per * per * per * _anchor1.y);
    }
}
class SimplePoint {
    private var _x:Number;
    private var _y:Number;
    public function SimplePoint(x:Number = 0, y:Number = 0) {
        _x = x;
        _y = y;
    }
    public function get x():Number {
        return _x;
    }
    public function set x(value:Number):void {
        _x = value;
    }
    public function get y():Number {
        return _y;
    }
    public function set y(value:Number):void {
        _y = value;
    }
}

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