applyPixelRatio(dashArray) {
    const pixelRatio = this.pixelRatio;
    return pixelRatio == 1
      ? dashArray
      : dashArray.map(function (dash) {
          return dash * pixelRatio;
        });
  }
@protected
@param {Array<number>} dashArray Dash array.
@return {Array<number>} Dash array with pixel ratio applied