Polylines

.NET Library to handle Google polylines. This library is heavily inspired by the polylines gem https://github.com/joshuaclayton/polylines

Install

Install-Package Polylines

Usage

To encode latitude/longitude points:

//Encode Points
var points = new List<PolylineCoordinate>
  {
    new PolylineCoordinate {Latitude = 38.5, Longitude = -120.2},
    new PolylineCoordinate {Latitude = 40.7, Longitude = -120.95},
    new PolylineCoordinate {Latitude = 43.252, Longitude = -126.453}
  };

var polylineForPoints = Polyline.EncodePoints(points);
Console.WriteLine(polylineForPoints);

//Output _p~iF~ps|U_ulLnnqC_mqNvxq`@

To decode a polyline into latitude/longitude points:

//Decode Polyline
var polyline = "_p~iF~ps|U_ulLnnqC_mqNvxq`@";
var decodedPoints = Polyline.DecodePolyline(polyline);
foreach (var decodedPoint in decodedPoints)
{
  Console.WriteLine(string.Format("Latitude: {0}, Longitude {1}", decodedPoint.Latitude, decodedPoint.Longitude));
}

//Output
Latitude: 38.5, Longitude -120.2
Latitude: 40.7, Longitude -120.95
Latitude: 43.252, Longitude -126.453

This follows the steps outlined in http://code.google.com/apis/maps/documentation/utilities/polylinealgorithm.html.

Author

Written by Mike Williams