/** * Stardust Rainbow * 長い時間見続けると酔うという、いわくつきのFlash * * forked from checkmate's Saqoosha challenge for amateurs */ package { import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.BlendMode; import flash.display.Sprite; import flash.display.StageQuality; import flash.display.StageScaleMode; import flash.events.Event; import flash.filters.BlurFilter; import flash.geom.Point; import flash.geom.Rectangle; import org.libspark.betweenas3.easing.Quint; [SWF(width = 465, height = 465, backgroundColor = 0x0, frameRate = 30)] public class StardustRainbow extends Sprite { //------------------------------------- //CLASS CONSTANTS private const W:uint = 465; private const H:uint = 465; private const SPRING:Number = 0.96; private const FRICTION:Number = 0.15; private const PI:Number = Math.PI; private const PI2:Number = PI * 2; private const PI1_2:Number = PI * 0.5; private const ZEROS:Point = new Point(0, 0); private const RECT:Rectangle = new Rectangle(0, 0, W, H); //------------------------------------- //VARIABLES private var _gradation:Gradation; private var _container:Sprite; private var _particles:Array; private var _blurFilter:BlurFilter; private var _canvasFront:BitmapData; private var _canvasBlur:BitmapData; private var _px:Number; private var _py:Number; private var _ox:Number; private var _oy:Number; private var _vx:Number; private var _vy:Number; static public var starShapeX:Array; static public var starShapeY:Array; //------------------------------------- //METHODS public function StardustRainbow():void { Wonderfl.disable_capture(); addEventListener(Event.ADDED_TO_STAGE, _initialize); } /** * EntryPoint */ private function _initialize(e:Event):void { removeEventListener(Event.ADDED_TO_STAGE, _initialize); stage.scaleMode = StageScaleMode.NO_SCALE; stage.quality = StageQuality.LOW; //虹色グラデーション _gradation = new Gradation(0xff0000, 0xff8000, 0xffff00, 0x00ff00, 0x00ffff, 0x0000ff, 0x8000ff); _gradation.setEasing(Quint.easeInOut); _container = new Sprite(); _particles = new Array(); addChild(new Bitmap( _canvasFront = new BitmapData(W, H, true, 0x0) ) ) as Bitmap; _canvasBlur = _canvasFront.clone(); _blurFilter = new BlurFilter(48, 48, 1); _ox = _px = mouseX; _oy = _py = mouseY; _vx = _vy = 0; starShapeX = new Array(10); starShapeY = new Array(10); for (var i:uint = 0; i < 10; ++i) { var angle:Number = (i / 10) * Math.PI * 2; var s:Number = (i % 2 == 0) ? 10 : 10 * 0.5; starShapeX[i] = s * Math.cos(angle); starShapeY[i] = s * Math.sin(angle); } addEventListener(Event.ENTER_FRAME, _update); } /** * Updator */ private function _update(e:Event):void { var dx:Number = mouseX - _px, dy:Number = mouseY - _py, ax:Number = dx * SPRING, ay:Number = dy * SPRING, p:Star, a:Number, i:int, n:int = _particles.length, angle:Number = Math.atan2(_vy, _vx); _vx += ax; _vy += ay; _px += _vx; _py += _vy; for (i = n - 1; i >= 0; --i) { p = _particles[i]; p.v += p.a; p.x += p.v * Math.cos(p.angle); p.y += p.v * Math.sin(p.angle); p.rotation += p.rot; p.scaleX = p.scaleY += p.v * 0.01; //画面外のは削除 if (p.x < 0 || p.x > W || p.y < 0 || p.y > H) { _container.removeChild( _particles.splice(i, 1)[0] ); } } n = 20; for (i = 0; i < n; ++i) { p = new Star(); p.x = mouseX; p.y = mouseY; p.a = 1.0 + (Math.random() - 0.5) * 0.2; p.v = 0; p.rot = (Math.random() - 0.5) * 10; p.rotation = Math.random() * PI2; p.angle = angle * 2 + (i - n / 2) * 0.2 + PI1_2; p.createShape(_gradation.getColor(i / n)); p.blendMode = BlendMode.ADD; _container.addChildAt(p, 0); _particles.push(p); } _vx *= FRICTION; _vy *= FRICTION; _ox = _px; _oy = _py; //drawing _canvasFront.lock(); _canvasBlur.lock(); _canvasFront.fillRect(RECT, 0x0); _canvasFront.draw(_container); _canvasBlur.copyPixels(_canvasFront, RECT, ZEROS); _canvasBlur.applyFilter(_canvasBlur, RECT, ZEROS, _blurFilter); _canvasFront.draw(_canvasBlur); _canvasFront.unlock(); _canvasBlur.unlock(); } } } import flash.display.Graphics; import flash.display.Shape; import flash.display.Sprite; class Star extends Sprite { public var a:Number; public var v:Number; public var angle:Number; public var rot:Number; public function Star():void { } public function createShape(color:uint):void { var i:uint; var g:Graphics = graphics; g.beginFill(color, 1); g.moveTo(StardustRainbow.starShapeX[0], StardustRainbow.starShapeY[0]); for (i = 0; i < 10; ++i) g.lineTo(StardustRainbow.starShapeX[i], StardustRainbow.starShapeY[i]); g.moveTo(StardustRainbow.starShapeX[0] * 0.5, StardustRainbow.starShapeY[0] * 0.5); for (i = 0; i < 10; ++i) g.lineTo(StardustRainbow.starShapeX[i] * 0.5, StardustRainbow.starShapeY[i] * 0.5); g.endFill(); } } /** * @author saqoosha * @see http://wonderfl.net/code/7ed2d650b9d513edf9a499fb704c19ecb7aa4694 */ import frocessing.color.ColorLerp; import org.libspark.betweenas3.core.easing.IEasing; import org.libspark.betweenas3.easing.Linear; class Gradation { private var _colors:Array; private var _easing:IEasing; public function Gradation(...args):void { _colors = args.concat(); _easing = Linear.linear; } public function setEasing(easing:IEasing):void { _easing = easing; } public function getColor(position:Number):uint { position = (position < 0 ? 0 : position > 1 ? 1 : position) * (_colors.length - 1); var idx:int = position; var alpha:Number = _easing.calculate(position - idx, 0, 1, 1); if (alpha == 0) { return _colors[idx]; } else { return ColorLerp.lerp(_colors[idx], _colors[idx + 1], alpha); } } }