Lightweight .NET Standard 2.0 library implementing Google Polyline Algorithm. Designed with respect to flexibility, but still with easy to use.

.NET Polyline Algorithm is avalable as nuget package Cloudikka.PolylineAlgorithm targeting .NET Standard 2.0.

Command line:

Install-Package Cloudikka.PolylineAlgorithm

NuGet Package Manager:

Cloudikka.PolylineAlgorithm

Library is using ValueTuple<T1, T2> Structure. ValueTuple struct is avalable in .NET Framework 4.7 and above. Incase your project is targeting lower version of .NET Framework you probably have to install System.ValueTuple NuGet package. (not tested yet)

Command line:

Install-Package System.ValueTuple

NuGet Package Manager:

System.ValueTuple

There are three ways how to use .NET Polyline Algorithm library based on your needs. For each is available Encode and Decode methods.

Whenever you just need to encode or decode Google polyline you can use static methods defined in static PolylineAlgorithm class.

	string polyline = "polyline";
	IEnumerable<(double, double)> coordinates = PolylineAlgorithm.Decode(polyline);

	IEnumerable<(double, double)> coordinates = new (double, double) [] { (35.635, 76.27182), (35.2435, 75.625), ... };
	string polyline = PolylineAlgorithm.Encode(coordinates);

If you need to use dependency injection, you would like to have instance to deliver the work for you. In that case you can use default instance of PolylineEncoding class, which implements IPolylineEncoding<(double Latitude, double Longitude)> interface.

	string polyline = "polyline";
	var encoding = new PolylineEncoding();
	IEnumerable<(double, double)> coordinates = encoding.Decode(polyline);

	IEnumerable<(double, double)> coordinates = new (double, double) [] { (35.635, 76.27182), (35.2435, 75.625), ... };
	var encoding = new PolylineEncoding();
	string polyline = encoding.Encode(coordinates);

There may be a scenario you need to pass and return different types to and from without a need to add another extra layer. In this case you can inherit PolylineEncodingBase class and override template methods CreateResult and GetCoordinates.

	public class MyPolylineEncoding : PolylineEncodingBase<Coordinate> {
	
		protected override Coordinate CreateResult(double latitude, double longitude) {
				return new Coordinate(latitude, longitude);
		}
	
		protected override (double Latitude, double Longitude) GetCoordinate(Coordinate source) {
				return (source.Latitude, source.Longitude);
		}
		
	}

	string polyline = "polyline";
	var encoding = new MyPolylineEncoding();
	IEnumerable<Coordinate> coordinates = encoding.Decode(polyline);

	IEnumerable<Coordinate> coordinates = new Coordinate [] { new Coordinate(35.635, 76.27182), new Coordinate(35.2435, 75.625), ... };
	var encoding = new MyPolylineEncoding();
	string polyline = encoding.Encode(coordinates);

Documentation is can be found at https://dropoutcoder.github.io/polyline-algorithm-csharp/api/index.html.

Happy coding!