Snowfall

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favorite:3
lines:158
license : MIT License
modified : 2009-12-14 04:10:47

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package {
	import flash.display.*;
	import flash.events.*;
	import flash.geom.*;
	import flash.filters.*;
	
	public class Main extends Sprite {
		private var points:Array;
		private var nPoints:uint =4000;
		private var obstacles:Array;
		private var nObstacles:uint = 5;
		private var vp:Object;
		private var i:uint, j:uint, k:uint;
		private var cx:uint, cy:uint;
		private var canvas:Bitmap;
		private var r:Number = 0;
		private const FP:uint = 100;
		
		public function Main() {
			Wonderfl.capture_delay(10);
			cx = stage.stageWidth / 2;
			cy = stage.stageHeight / 2;
			vp = {x:0, y:150, z:- 200, rx:0.3, ry:0, rz:0}
			points = [];
			obstacles = [];
			
			var i:uint;
			
			for (i = 0; i < nObstacles; i ++) {
				obstacles.push(initObstacle({}));
			}
			addChild(canvas = new Bitmap(new BitmapData(stage.stageWidth, stage.stageHeight,false,0x000000)));
			addEventListener(Event.ENTER_FRAME, h_enterframe);
		}
		
		private function initPoint(o:Object):Object {
			o.x = (Math.random() * 10 - 5 ) * 15;
			o.y = (Math.random() * 10 - 5) * 5;
			o.z = (Math.random() * 10 - 5) * 15;
			o.vx = (Math.random() - 0.5) / 6;
			o.vy = 1;
			o.vz = (Math.random() - 0.5) / 6;
			//o.col = 0xffffffff & Math.floor(Math.random() * 0xffffffff);
			o.col = 0xff555555;
			o.trapped = false;
			o.drawFlag = false;
			return o;
		}
		
		
		private function initObstacle(o:Object):Object {
			o.x = (Math.random() * 10 - 5 ) * 15;
			o.y = (Math.random() * 10) * 10 + 50;
			o.z = (Math.random() * 10 - 5) * 15;
			o.w = Math.random()  * 50 +30;
			o.h = Math.random()  * 50 + 30;
			o.x -= o.w / 2;
			o.z -= o.h / 2;
			return o;
		}
		
		private function h_enterframe(evt:Event):void {
			if (points.length <= nPoints) {
				for(var i:uint = 0; i < 100; i ++) {
				points.push(initPoint({}));
				}
			}
			if (Math.random() < 0.05) {
				var ind:uint = Math.floor(obstacles.length * Math.random());
				initObstacle(obstacles[ind]);
			}
			
			r += 0.001;
			vp.x = Math.cos(r) * 200;
			vp.z = Math.sin(r) * 200;
			vp.ry = Math.atan2(vp.x, -vp.z);
			render();
		}
		
		private function render():void {
			var i:uint;
			for (i = 0; i < points.length; i ++) {
				move(points[i]);
			}
			var p2ds:Array = p3dTo2d(points);

var brush:BitmapData = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0x00000000);
			for (i = 0; i < p2ds.length; i ++) {
				brush.setPixel32(p2ds[i].x + cx, p2ds[i].y + cy,p2ds[i].col);
			}
			var b:BitmapData = canvas.bitmapData;
			b.applyFilter(b,b.rect,new Point(0,0),new BlurFilter(6,6));
			
			b.applyFilter(b,b.rect, new Point(0,0),
			new ColorMatrixFilter([
								  0.95,0,0,0,
								  0,0.95,0,0,0,
								  0.0,0.95,0,0,
								  0,0,0,1.0,0]));
			
			b.draw(brush, null, null, BlendMode.ADD);
		}
		
		private function move(o:Object):void {
			var flag:Boolean = false;
			for (var i:uint = 0; i < obstacles.length; i ++) {
				if (obstacles[i].y >= o.y && obstacles[i].y <= o.y + o.vy) {
					var rect:Rectangle = new Rectangle(obstacles[i].x, obstacles[i].z, obstacles[i].w, obstacles[i].h);
					if (rect.contains(o.x, o.z)) {
						o.y = obstacles[i].y;
						flag = true;
					}
				}
			}
			
			if (flag) {
				o.drawFlag = true;
			 	if (!o.trapped) {
					o.trapped =true;
				var r:Number = Math.random() * Math.PI * 2;
					var s:Number = (Math.random() + 1) / 50;
					o.vx = Math.cos(r) * s;
					o.vz = Math.sin(r) * s;
					o.vy = 0;
				} 
			} else {
				o.trapped = false;
				o.vx = 0;
				o.vz = 0;
				o.vy += 0.01;
			}
			
			o.x += o.vx;
			o.y += o.vy;
			o.z += o.vz;
			
			if (o.y >= 200) {
				initPoint(o);
				//o.y = 0;
			}
			
		}
		
		private function p3dTo2d(p3ds:Array):Array {
			var i:uint;
			var p2ds:Array = [];
			
			//var p3ds2:Array = [];
			var rxs:Number = Math.sin(vp.rx);
			var rxc:Number = Math.cos(vp.rx);
			var rys:Number = Math.sin(vp.ry);
			var ryc:Number = Math.cos(vp.ry);
			var rzs:Number = Math.sin(vp.rz);
			var rzc:Number = Math.cos(vp.rz);
			
			for (i = 0; i < p3ds.length; i ++) {
				var to:Object = {}, tto:Object = {};
				tto.x = p3ds[i].x - vp.x;
				tto.y = p3ds[i].y - vp.y;
				tto.z = p3ds[i].z - vp.z;
				
				to = {x:tto.x, y:tto.y, z:tto.z};
				var tx:Number,ty:Number,tz:Number;
				
				
				tx = to.x; ty = to.y;
				to.x =  rzc * tx + rzs * ty;
				to.y =  rzc * ty - rzs * tx;
				
				tx = to.x; tz = to.z;
				to.x =  ryc * tx + rys * tz;
				to.z =  ryc * tz - rys * tx;
				
				ty = to.y; tz = to.z;
				to.y =  rxc * ty + rxs * tz;
				to.z =  rxc * tz - rxs * ty;
				
				if (i == 0) {
					//trace(Math.floor(to.x), Math.floor(to.y), Math.floor(to.z));
				}
				if (to.z  >= FP) {
					var ratio:Number = (to.z + FP) / FP;
					p2ds.push({x:to.x * ratio, y:to.y * ratio, z:to.z, col:p3ds[i].col,drawFlag:p3ds[i].drawFlag, trapped:p3ds[i].trapped});
				}
			}
			return p2ds
		}
		
	}
}

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