// Copyright 2018 Google Inc. All Rights Reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS-IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

//

// Author: ericv@google.com (Eric Veach)

#include "s2/s2polyline_measures.h"

#include "absl/types/span.h"

#include "s2/s1angle.h"

#include "s2/s2centroids.h"

#include "s2/s2point.h"

#include "s2/s2point_span.h"

namespace S2 {

S1Angle GetLength(S2PointSpan polyline) {

  S1Angle length;

  for (size_t i = 1; i < polyline.size(); ++i) {

    length += S1Angle(polyline[i - 1], polyline[i]);

  }

  return length;

}

S2Point GetCentroid(S2PointSpan polyline) {

  S2Point centroid;

  for (size_t i = 1; i < polyline.size(); ++i) {

    centroid += S2::TrueCentroid(polyline[i - 1], polyline[i]);

  }

  return centroid;

}

}  // namespace S2