code: function (xUnits, x, yUnits, y) {
  
              /**
               * The offset in the X dimension, interpreted according to this instance's xUnits argument.
               * @type {Number}
               */
              this.x = x;
  
              /**
               * The offset in the Y dimension, interpreted according to this instance's yUnits argument.
               * @type {Number}
               */
              this.y = y;
  
              /**
               * The units of this instance's X offset. See this class' constructor description for a list of the
               * possible values.
               * @type {String}
               */
              this.xUnits = xUnits;
  
              /**
               * The units of this instance's Y offset. See this class' constructor description for a list of the
               * possible values.
               * @type {String}
               */
              this.yUnits = yUnits;
          }
docs: Constructs an offset instance given specified units and offsets.
  @alias Offset
  @constructor
  @classdesc Specifies an offset relative to a rectangle. Used by [Placemark]{@link Placemark} and
  other shapes.
  @param {String} xUnits The type of units specified for the X dimension. May be one of the following:
  <ul>
  <li>[WorldWind.OFFSET_FRACTION]{@link WorldWind#OFFSET_FRACTION}</li>
  <li>[WorldWind.OFFSET_INSET_PIXELS]{@link WorldWind#OFFSET_INSET_PIXELS}</li>
  <li>[WorldWind.OFFSET_PIXELS]{@link WorldWind#OFFSET_PIXELS}</li>
  </ul>
  @param {Number} x The offset in the X dimension.
  @param {String} yUnits The type of units specified for the Y dimension, assuming a lower-left Y origin.
  May be one of the following:
  <ul>
  <li>[WorldWind.OFFSET_FRACTION]{@link WorldWind#OFFSET_FRACTION}</li>
  <li>[WorldWind.OFFSET_INSET_PIXELS]{@link WorldWind#OFFSET_INSET_PIXELS}</li>
  <li>[WorldWind.OFFSET_PIXELS]{@link WorldWind#OFFSET_PIXELS}</li>
  </ul>
  @param {Number} y The offset in the Y dimension.