Fitting OpenFL DisplayObject within bounds and center

FitWithinAndCenter.hx

var w = 800; //or whatever
var h = 300;
var obj = new Bitmap(someBitmapData);
var s = new Sprite();
s.graphics.beginFill(0x000000,0);
s.graphics.drawRect(0,0,w,h);
s.graphics.endFill();
var hRatio = obj.height / h;
var wRatio = obj.width / w;
if (wRatio > hRatio) {
	obj.scaleX = obj.scaleY = 1/wRatio;
} else if (hRatio > wRatio) {
	obj.scaleX = obj.scaleY = 1/hRatio;
} else {
	obj.scaleX = obj.scaleY = 1;
}
obj.x = (w - obj.width) / 2;
obj.y = (h - obj.height) / 2;
s.addChild(obj);