// forked from Saqoosha's forked from: forked from: RainyDay // forked from Saqoosha's forked from: RainyDay // forked from ahchang's RainyDay // forked from Saqoosha's forked from: Snow // forked from Saqoosha's Snow /* * blog@http://tirirenge.undo.jp/?p=1821 */ package { import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.BlendMode; import flash.display.PixelSnapping; import flash.display.Sprite; import flash.events.Event; import flash.filters.BlurFilter; import flash.filters.ColorMatrixFilter; import flash.geom.Matrix; import flash.geom.Point; import flash.text.TextField; import flash.text.TextFieldAutoSize; import flash.text.TextFormat; import flash.utils.Dictionary; import net.hires.debug.Stats; import frocessing.color.ColorHSV; [SWF(width=465, height=465, backgroundColor=0x0, frameRate=120)] public class RainyDay extends Sprite { private static const GRAVITY:Number = 20; private static const DRAG:Number = 0.7; private static const ZERO_POINT:Point = new Point(0, 0); private var _canvas:BitmapData; private var _glow:BitmapData; private var _glowMtx:Matrix; private var _forceMap:BitmapData; // private var _snow:Array; private var _snow:Dictionary; private var _color:ColorMatrixFilter = new ColorMatrixFilter([ 1, 0, 0, 0, -5, 0, 1, 0, 0, -5, 0, 0, 1, 0, -5, 0, 0, 0, 1, 0 ]); private var _hsv:ColorHSV = new ColorHSV(); private var _blur:BlurFilter = new BlurFilter(1.5, 1.5, 1); public function RainyDay() { this._canvas = new BitmapData(465, 465, false, 0x0); // カンバスをつくる。ここに 1 pixel ずつ描いていくよ this.addChild(new Bitmap(this._canvas)) as Bitmap; // stage に配置 /*this._glow = new BitmapData(465 / 4, 465 / 4, false, 0x0); // キラキラを描く用のん。カンバスの 4 分の 1 のサイズ var bm:Bitmap = this.addChild(new Bitmap(this._glow, PixelSnapping.NEVER, true)) as Bitmap; // smoothing を true にして配置 //bm.scaleX = bm.scaleY = 4; // 4 倍にする。 bm.blendMode = BlendMode.ADD; // 加算モードで合成 this._glowMtx = new Matrix(0.25, 0, 0, 0.25);*/ // 雪を積もらせるかたちを BitmapData に描く。 var tf:TextField = new TextField(); tf.defaultTextFormat = new TextFormat('Verdana', 64, 0xffffff, true); tf.autoSize = TextFieldAutoSize.LEFT; tf.text = 'Rainyday'; tf.x = (465 - tf.width) / 2; tf.y = (465 - tf.height) / 2; this._forceMap = new BitmapData(465, 465, false, 0x0); this._forceMap.draw(tf, tf.transform.matrix); this._forceMap.applyFilter(this._forceMap, this._forceMap.rect, new Point(0, 0), new BlurFilter(8, 8)); // this._snow = []; // 雪パーティクルはここにいれておくよ。 this._snow = new Dictionary(); this.addChild(new Stats()); this.addEventListener(Event.ENTER_FRAME, this.update); // 毎フレーム update を呼ぶよ } // 雪を 1 粒発生させる関数 public function emitParticle(ex:Number, ey:Number, s:Number = 1, c:int = 0x00bfff, vx:Number = 0, vy:Number = 0):SnowParticle { var p:SnowParticle = new SnowParticle(); // 作って // パラメータ設定して p.x = ex; p.y = ey; p.vx = vx; p.vy = vy; p.s = s; p.c = c; // this._snow.push(p); // 保存 this._snow[p] = true; return p; } // 雪を動かすよーー public function update(e:Event):void { this._canvas.lock(); // いっぱい setPixel するときは必ず lock しよう this._canvas.applyFilter(this._canvas, this._canvas.rect, ZERO_POINT, this._color); this._canvas.applyFilter(this._canvas, this._canvas.rect, ZERO_POINT, this._blur); // this._canvas.fillRect(this._canvas.rect, 0x0); // カンバスをクリア // var n:int = this._snow.length; var d:Number; var gravity:Number = GRAVITY / 100; // あらかじめ計算しとく // while (n--) { for (var key:* in this._snow) { var p:SnowParticle = SnowParticle(key); // var p:SnowParticle = this._snow[n]; // p.vx += 0.02; p.vy += gravity * p.s; // まず重力を加える p.vx *= 0.99; // 空気抵抗 p.vy *= 0.99; // y 方向にも d = 1 - (this._forceMap.getPixel(p.x, p.y) / 0xffffff) * DRAG; // forceMap にもとづいて抵抗値を計算。黒→速い、白→遅い。 p.vx *= d; // forceMap から得た抵抗値を適用 var vy:Number = p.vy; p.vy *= d; // y 方向にも if ((vy - p.vy) > 1 && Math.random() < 0.3) { //p.vy = -2; //p.vx = (Math.random() - 0.5) * 3; this.emitParticle(p.x, p.y - 2, 1, p.c, (Math.random() - 0.5) * 6, -(Math.random() * 2 + 1)); this.emitParticle(p.x, p.y - 2, 1, p.c, (Math.random() - 0.5) * 6, -(Math.random() * 2 + 1)); this.emitParticle(p.x, p.y - 2, 1, p.c, (Math.random() - 0.5) * 6, -(Math.random() * 2 + 1)); } var px:int = p.x; var py:int = p.y; p.x += p.vx; // 動かす p.y += p.vy; // this._canvas.setPixel(p.x, p.y, p.c); // 雪 1 粒描く _drawLine(p.x, p.y, px, py, p.c, 1); if (p.y > this.stage.stageHeight) { // もし画面外にでちゃったら // this._snow.splice(n, 1); // とりのぞく delete this._snow[p]; } } this._canvas.unlock(); // lock したやつは必ず unlock //this._glow.draw(this._canvas, this._glowMtx); // キラキラを描く // 雪を発生させますよ // var n = 10; // while (n--) { for (var i:int = 0; i < 4; i++) { _hsv.h = Math.random() * 20 + 180; this.emitParticle(Math.random() * this.stage.stageWidth, -20, Math.random() + 0.5, _hsv.value); } } private function _drawLine(x0:int, y0:int, x1:int, y1:int, color:int, alpha:Number):void { var steep:Boolean = Math.abs(y1 - y0) > Math.abs(x1 - x0); var tmp:int; if (steep) { tmp = x0; x0 = y0; y0 = tmp; tmp = x1; x1 = y1; y1 = tmp; } if (x0 > x1) { tmp = x0; x0 = x1; x1 = tmp; tmp = y0; y0 = y1; y1 = tmp; } var deltax:int = x1 - x0; var deltay:int = Math.abs(y1 - y0); var error:int = deltax / 2; var ystep:int; var y:int = y0; if (y0 < y1) { ystep = 1; } else { ystep = -1; } for (var x:int = x0; x <= x1; x++) { if (steep) { this._canvas.setPixel32(y, x, color | ((alpha * 0xff) << 24)); } else { this._canvas.setPixel32(x, y, color | ((alpha * 0xff) << 24)); } error = error - deltay; if (error < 0) { y = y + ystep; error = error + deltax; } } } } } class SnowParticle { public var x:Number; public var y:Number; public var vx:Number; public var vy:Number; public var s:Number; public var c:int; public function SnowParticle() { this.x = 0; this.y = 0; this.vx = 0; this.vy = 0; this.s = 1; this.c = 0xffffff; } }