static getTouchCoordinates(event) {
    return [
      {
        x: event.touches[0].clientX,
        y: event.touches[0].clientY
      },
      {
        x: event.touches[1].clientX,
        y: event.touches[1].clientY
      }
    ];
  }
Get X,Y coordinates from touch pointers.
@param {Event} event
@return {Object}