//Seamless Background Class
//Ben Pritchard 2006
//Pixelfumes.com

import flash.display.BitmapData;

class SeamlessBackground{
	var stageWidth:Number;
	var stageHeight:Number;
	var scope:MovieClip;
	var linkageID:String;
	var clipWidth:Number;
	var clipHeight:Number;
	var stageListener:Object;
	var centeredClip:MovieClip = null;
	var tileCount:Number;
	var useBitmap:Boolean;
	
	function SeamlessBackground(s:MovieClip,linkage:String,useBMP:Boolean){
		linkageID = linkage;
		useBitmap = useBMP;
		
		stageListener = new Object();
		stageListener.cRef = this;
		stageListener.onResize = function(){
			this.cRef.updateTiles();
		}
		Stage.addListener(stageListener);
		
		scope = s;
		scope.createEmptyMovieClip("tile_1",1);
		if(useBitmap != true){
			scope["tile_1"].attachMovie(linkageID,"tile",1);
			clipWidth = scope["tile_1"]._width;
			clipHeight = scope["tile_1"]._height;
		}else{
			var bmpd:BitmapData = BitmapData.loadBitmap(linkageID);
			with(scope["tile_1"]){
				beginBitmapFill(bmpd, matrix, repeat, smoothing);
				repeat = true;
				moveTo(0, 0);
				lineTo(0, Stage.height);
				lineTo(Stage.width, Stage.height);
				lineTo(Stage.width, 0);
				lineTo(0, 0);
				endFill();
			}
		}
	}
	
	public function setCenteredClip(mc:MovieClip):Void{
		centeredClip = mc;
		updateTiles();
	}
	
	private function updateTiles():Void{
		if(useBitmap != true){
			destroyTiles();
			
			var fitsX:Number = Math.ceil(Stage.width/clipWidth);
			var fitsY:Number = Math.ceil(Stage.height/clipHeight);
			var colCount:Number = 1;
	
			for(var x:Number=1; x<fitsX*fitsY; x++){
				
				scope.createEmptyMovieClip("tile_"+(x+1),x+1);
				var nClip:MovieClip = scope["tile_"+(x+1)];
				nClip.attachMovie(linkageID,"tile",1);
				var lClip:MovieClip = scope["tile_"+x];
				
				if(colCount+1 > fitsX){
					colCount = 0;
					nClip._x = 0;
					nClip._y = lClip._y + lClip._height;
				}else{
					nClip._x = lClip._x + lClip._width;
					nClip._y = lClip._y;
				}
				colCount++;
			}
					
			tileCount = fitsX*fitsY;
		}else{
			var bmpd:BitmapData = BitmapData.loadBitmap(linkageID);
			with(scope["tile_1"]){
				clear();
				beginBitmapFill(bmpd, matrix, repeat, smoothing);
				moveTo(0, 0);
				lineTo(0, Stage.height);
				lineTo(Stage.width, Stage.height);
				lineTo(Stage.width, 0);
				lineTo(0, 0);
				endFill();
			}
		}
		
		if(centeredClip != null){
			centeredClip._x = (Stage.width/2)-centeredClip._width/2;
			centeredClip._y = (Stage.height/2)-centeredClip._height/2;
		}
	}
	
	public function destroyTiles():Void{
		for(var x:Number=1;x<tileCount;x++){
			scope["tile_"+(x+1)].removeMovieClip();
		}
	}
}