forked from: lightning

by okoi 31 Mar 2010

• Forked from kiyobu's lightning
• Diff: 43
• Related works: 4
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/**
 * Copyright okoi ( http://wonderfl.net/user/okoi )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/uDMD
 */

// forked from kiyobu's lightning
package {
    import flash.display.Sprite;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.events.Event;
    import flash.filters.GlowFilter;
    import flash.filters.BlurFilter;
    import flash.display.BlendMode;
    import flash.geom.ColorTransform;
    [SWF(width = "465", height = "465", backgroundColor = "0x000000", frameRate = "30")]
    public class FlashTest extends Sprite {
    		public var layer:Array = new Array();
    		
    		private static const LIGHT_LENGTH:int = 250;
    		private static const LIGHT_NUM:int = 40;
    		private var r:Number = 0;
    		
        public function FlashTest() {
	        	layer[0] = new Bitmap(new BitmapData(stage.stageWidth, stage.stageHeight, true, 0x00000000));
	        layer[0].filters = [new BlurFilter(2,2,1)]
			layer[1] = new Sprite();
			layer[1].filters = [new BlurFilter(2,2,1), new GlowFilter(0x4411ff, 1, 32, 32, 8, 3)]
			addChild(layer[0]);
			addChild(layer[1]);
        		addEventListener(Event.ENTER_FRAME, loop);
        }
        public function loop(e:Event):void{
        		lightning(layer[1]);
        		var cash:BitmapData = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0x00000000);
        		cash.draw(this, null, new ColorTransform(1,1,1,0.9), BlendMode.ADD);
   			layer[0].bitmapData = cash;
   			
   			r = (r + 1) % 360;
        }
        public function lightning(tg:Sprite):void{
        		var defX:Number = stage.stageWidth/2;
        		var defY:Number = stage.stageHeight/2;
        		var xx:Number = 0;
        		var yy:Number = 0;
        		
        		var rx:Number = xx;
        		var ry:Number = yy;
        		
        		var th:Number = random(2) +1
        		tg.graphics.clear();
        		
        		for( var i:int = 0; i < LIGHT_NUM; i++ )
        		{
        			var angle:Number;
        			if( i % 2 == 0 )	angle = ((360 * i / LIGHT_NUM) + r) % 360;
        			else				angle = ((360 * i / LIGHT_NUM) - r) % 360;
        			
        			var radians:Number = angle * Math.PI/ 180;
        			var sin:Number = Math.sin( radians );
        			var cos:Number = Math.cos( radians );
        			xx = 0;
        			yy = 50;
        			
	        		rx = cos * xx - sin * yy;	
        			ry = sin * xx + cos * yy;
        			
	        		tg.graphics.moveTo(rx+defX, ry+defY);
	        		
	        		while(Math.abs(yy) < LIGHT_LENGTH){
	        			xx += random(20) * (random(2)*2 -1);
	        			yy += random(30) * 3;
	      	  		rx = cos * xx - sin * yy;	
        				ry = sin * xx + cos * yy;
	        			tg.graphics.lineStyle(th,0xffffff,1);
	        			tg.graphics.lineTo(rx+defX,ry+defY);
	        			
	        		}
        		}
        }
        public function random(n:Number):Number{
        		return Math.floor(Math.random() * n);
        }
    }
}