forked from: 秒速5センチメートル

by fukt 01 Nov 2009

• Forked from brick's 秒速5センチメートル
• Diff: 6
• Related works: 3
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// 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 = 10;
		
		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, 5, 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(0x800000);
				addChild(snow);
				snow.x = Math.random() * stage.stageWidth;
				snow.y = Math.random() * stage.stageHeight;
				snow.rotation = Math.atan2(_vy, _vx) * 180 / Math.PI + 10;
				snow.scaleX = scale;
				snow.scaleY = scale;				
				snows.push(snow);
				var blur:BlurFilter = new BlurFilter(0, 0, 0);
				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 / 1.5;
				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;
		}
		
	}
}