text: var _ol_geom_flat_length_ = {};
  
  
  /**
   * @param {Array.<number>} flatCoordinates Flat coordinates.
   * @param {number} offset Offset.
   * @param {number} end End.
   * @param {number} stride Stride.
   * @return {number} Length.
   */
  _ol_geom_flat_length_.lineString = function(flatCoordinates, offset, end, stride) {
    var x1 = flatCoordinates[offset];
    var y1 = flatCoordinates[offset + 1];
    var length = 0;
    var i;
    for (i = offset + stride; i < end; i += stride) {
      var x2 = flatCoordinates[i];
      var y2 = flatCoordinates[i + 1];
      length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
      x1 = x2;
      y1 = y2;
    }
    return length;
  };
  
  
  /**
   * @param {Array.<number>} flatCoordinates Flat coordinates.
   * @param {number} offset Offset.
   * @param {number} end End.
   * @param {number} stride Stride.
   * @return {number} Perimeter.
   */
  _ol_geom_flat_length_.linearRing = function(flatCoordinates, offset, end, stride) {
    var perimeter =
        _ol_geom_flat_length_.lineString(flatCoordinates, offset, end, stride);
    var dx = flatCoordinates[end - stride] - flatCoordinates[offset];
    var dy = flatCoordinates[end - stride + 1] - flatCoordinates[offset + 1];
    perimeter += Math.sqrt(dx * dx + dy * dy);
    return perimeter;
  };
  export default _ol_geom_flat_length_;
  