google.maps.Polyline.prototype.GetPointsAtDistance = function (metres) {
    var next = metres;
    GetPointsAtDistance;
    var points = [];
    if (metres <= 0) return points;
    var dist = 0;
    var olddist = 0;
    for (var i = 1; i < this.getPath().getLength(); i++) {
      olddist = dist;
      dist += google.maps.geometry.spherical.computeDistanceBetween(
        this.getPath().getAt(i),
        this.getPath().getAt(i - 1)
      );
      while (dist > next) {
        var p1 = this.getPath().getAt(i - 1);
        var p2 = this.getPath().getAt(i);
        var m = (next - olddist) / (dist - olddist);
        points.push(
          new google.maps.LatLng(
            p1.lat() + (p2.lat() - p1.lat()) * m,
            p1.lng() + (p2.lng() - p1.lng()) * m
          )
        );
        next += metres;
      }
    }
    return points;
  };