// forked from brick's 秒速5センチメートル // write as3 code here.. package { import flash.display.Sprite; import flash.display.StageAlign; import flash.display.StageScaleMode; import flash.events.Event; import flash.filters.BlurFilter; public class FivecmPerSecSnow extends Sprite { private var vx:Number; private var vy:Number; private var _vx:Number = 35; private var _vy:Number = 25; private var largeSnows:Array; private var midSnows:Array; private var smallSnows:Array; private var numSnow:int =1; private var largeScale:Number = 1.1; private var midScale:Number = 0.6; private var smallScale:Number = 0.3; public function FivecmPerSecSnow() { init(); } private function init() { stage.scaleMode = StageScaleMode.NO_SCALE; stage.align = StageAlign.TOP_LEFT; graphics.beginFill(0x555f76); graphics.drawRect(0, 0, stage.stageWidth, stage.stageHeight); graphics.endFill(); largeSnows = new Array(); addSnows(largeSnows, numSnow, largeScale); midSnows = new Array(); addSnows(midSnows, numSnow, midScale); smallSnows = new Array(); addSnows(smallSnows, 20, smallScale); addEventListener(Event.ENTER_FRAME, onEnterFrame); } private function onEnterFrame(event:Event):void { moveSnow(largeSnows, largeScale); moveSnow(midSnows, midScale); moveSnow(smallSnows, smallScale); } private function addSnows(snows:Array, numSnow:int, scale:Number = 1) { for (var i:int = 0; i < numSnow; i++) { var snow:Sprite = makeSnow(0xffffff); addChild(snow); snow.x = Math.random() * stage.stageWidth; snow.y = Math.random() * stage.stageHeight; snow.rotation = Math.atan2(_vy, _vx) * 180 / Math.PI + 90; snow.scaleX = scale; snow.scaleY = scale; snows.push(snow); var blur:BlurFilter = new BlurFilter(5, 5, 3); snow.filters = [blur]; } } private function moveSnow(snows:Array, scale:Number = 1):void { for (var i:int = 0; i < snows.length; i++) { var snow = snows[i]; vx = Math.random() * _vx + _vx / 2; vy = Math.random() * _vy + _vy / 2; snow.x += vx * scale; snow.y += vy * scale; snow.rotation = Math.atan2(vy, vx) * 180 / Math.PI + 90; if (snow.x > stage.stageWidth || snow.y > stage.stageHeight) { if (Math.random() > 0.5) { snow.x = 0; snow.y = Math.random() * stage.stageHeight; } else { snow.x = Math.random() * stage.stageWidth; snow.y = 0; } } } } private function makeSnow(color:uint):Sprite { var sp = new Sprite(); sp.graphics.lineStyle(1, color); sp.graphics.beginFill(color); sp.graphics.moveTo(0, 0); sp.graphics.lineTo(5, 0); sp.graphics.lineTo(5, 30); sp.graphics.lineTo(0, 30); sp.graphics.lineTo(0, 0); sp.graphics.endFill(); return sp; } } }