text:         // Copyright: 2015 AlignAlytics
          // License: "https://github.com/PMSI-AlignAlytics/dimple/blob/master/MIT-LICENSE.txt"
          // Source: /src/objects/chart/methods/_xPixels.js
          // Access the pixel position of the x co-ordinate of the plot area
          this._xPixels = function () {
              return dimple._parseXPosition(this.x, this.svg.node());
          };