code: function(x, y, w, h) {
          if (x || y) this._setPosition(this._x + x, this._y + y);
          if (w) this.w += w;
          if (h) this.h += h;
  
          return this;
      }
docs: @
  #.shift
  @comp 2D
  @kind Method
  
  @sign public this .shift(Number x, Number y, Number w, Number h)
  @param x - Amount to move X
  @param y - Amount to move Y
  @param w - Amount to widen
  @param h - Amount to increase height
  
  Shift or move the entity by an amount. Use negative values
  for an opposite direction.