package {
	import flash.display.BitmapData;
	import flash.utils.ByteArray;
	public class Shadow {
		public var width:int = 200;
		public var height:int = 150;
		public var white:uint = 0xFFFFFF90; // 光の色 黄
		public var black:uint = 0x00000000; // 影の色
		protected var bytes:ByteArray;
		protected var bmd:BitmapData;
		
		public function Shadow() {
			bytes = new ByteArray();
			bytes.length = width*height/8;
			bmd = new BitmapData(width, height, true, 0xFF000000);
			trace("Construct: Shadow");
		}
		
		public function setPixel(x:int, y:int, pix:Boolean):void{
			var i:int = x+y*width;
			if(pix) bytes[Math.floor(i/8)] &= ~(1<<(i%8));
			else bytes[Math.floor(i/8)] |= (1<<(i%8));
		}
		
		public function getPixel(x:int, y:int):Boolean{
			var i:int = x+y*width;
			if( bytes[ Math.floor(i/8) ]&(1<<(i%8)) ) return false;
			else return true;
		}
		
		public function getBitmapData():BitmapData{
			return bmd;
		}
		
		public function updateBitmapData():void{
			bmd.lock();
			for(var y:int = 0; y < height; y++){
				for(var x:int = 0; x < width; x++){
					if(getPixel(x, y)) bmd.setPixel(x, y, black);
					else bmd.setPixel(x, y, white);
				}
			}
			bmd.unlock();
		}

		public function getByteArray():ByteArray{
			return bytes;
		}
		
		public function setByteArray(bytes:ByteArray):void{
			this.bytes = bytes;
		}
	}

}