code: function (coord, dim) {
          var axisLayout = this._axesLayout[dim];
          return graphic.applyTransform([coord, 0], axisLayout.transform);
      }
docs: Convert coords of each axis to Point.
  Return point. For example: [10, 20]
  @param {Array.<number>} coords
  @param {string} dim
  @return {Array.<number>}