docs: function (rect) {
  			return Crafty.viewport._x + rect._x + rect._w > 0 && Crafty.viewport._y + rect._y + rect._h > 0 &&
  				   Crafty.viewport._x + rect._x < Crafty.viewport.width && Crafty.viewport._y + rect._y < Crafty.viewport.height;
  		}