code: function (start, stop, line) {
          var sum = 0;
          var slice = [];
  
          for (var i = 0; i < line.length - 1; i++) {
              var p0 = line[i];
              var p1 = line[i + 1];
              var d = this.distance(p0, p1);
  
              sum += d;
  
              if (sum > start && slice.length === 0) {
                  slice.push(interpolate(p0, p1, (start - (sum - d)) / d));
              }
  
              if (sum >= stop) {
                  slice.push(interpolate(p0, p1, (stop - (sum - d)) / d));
                  return slice;
              }
  
              if (sum > start) slice.push(p1);
          }
  
          return slice;
      }
docs: Returns a part of the given line between the start and the stop points indicated by distance along the line.
  
  @param {number} start distance
  @param {number} stop distance
  @param {Array<Array<number>>} line
  @returns {Array<Array<number>>} line part of a line
  @example
  var line2 = ruler.lineSliceAlong(10, 20, line1);
  //=line2