Tommy's Module Pattern 1

background_positioner.js

var BackgroundPositioner = (function(){
  var xVal = 0,
      yVal = 0;
  
  var getCoords = function(){
    return xVal + "px " + yVal + "px";
  },
  
  setCoords = function(coords){
    xVal = parseInt(coords[0]);
    yVal = parseInt(coords[1]);
  },
  
  move = function(direction, val){
    val = 1 || val;
    switch(direction){
      case "up":
        yVal -= val;
        break;
      case "down":
        yVal += val;
        break;
      case "left":
        xVal -= val;
        break;
      case "right":
        xVal += val;
        break;
    }
  };
  
  return {
    move: move,
    setCoords: setCoords,
    getCoords: getCoords
  }
  
}());