// Copyright (c) 2015, Google Inc.
//
// 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.

syntax = "proto3";

package google.type;

option objc_class_prefix = "GTP";


// An object representing a latitude/longitude pair. This is expressed as a pair
// of doubles representing degrees latitude and degrees longitude. Unless
// specified otherwise, this must conform to the
// <a href="http://www.unoosa.org/pdf/icg/2012/template/WGS_84.pdf">WGS84
// standard</a>. Values must be within normalized ranges.
//
// Example of normalization code in Python:
//
//     def NormalizeLongitude(longitude):
//       """Wraps decimal degrees longitude to [-180.0, 180.0]."""
//       q, r = divmod(longitude, 360.0)
//       if r > 180.0 or (r == 180.0 and q <= -1.0):
//         return r - 360.0
//       return r
//
//     def NormalizeLatLng(latitude, longitude):
//       """Wraps decimal degrees latitude and longitude to
//       [-180.0, 180.0] and [-90.0, 90.0], respectively."""
//       r = latitude % 360.0
//       if r <= 90.0:
//         return r, NormalizeLongitude(longitude)
//       elif r >= 270.0:
//         return r - 360, NormalizeLongitude(longitude)
//       else:
//         return 180 - r, NormalizeLongitude(longitude + 180.0)
//
//     assert 180.0 == NormalizeLongitude(180.0)
//     assert -180.0 == NormalizeLongitude(-180.0)
//     assert -179.0 == NormalizeLongitude(181.0)
//     assert (0.0, 0.0) == NormalizeLatLng(360.0, 0.0)
//     assert (0.0, 0.0) == NormalizeLatLng(-360.0, 0.0)
//     assert (85.0, 180.0) == NormalizeLatLng(95.0, 0.0)
//     assert (-85.0, -170.0) == NormalizeLatLng(-95.0, 10.0)
//     assert (90.0, 10.0) == NormalizeLatLng(90.0, 10.0)
//     assert (-90.0, -10.0) == NormalizeLatLng(-90.0, -10.0)
//     assert (0.0, -170.0) == NormalizeLatLng(-180.0, 10.0)
//     assert (0.0, -170.0) == NormalizeLatLng(180.0, 10.0)
//     assert (-90.0, 10.0) == NormalizeLatLng(270.0, 10.0)
//     assert (90.0, 10.0) == NormalizeLatLng(-270.0, 10.0)
message LatLng {
  // The latitude in degrees. It must be in the range [-90.0, +90.0].
  double latitude = 1;

  // The longitude in degrees. It must be in the range [-180.0, +180.0].
  double longitude = 2;
}