GMap.NET.Core/GMap.NET.Projections/MercatorProjectionYandex.cs

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namespace GMap.NET.Projections
{
   using System;

   class MercatorProjectionYandex : PureProjection
   {
      public static readonly MercatorProjectionYandex Instance = new MercatorProjectionYandex();

      static readonly double MinLatitude = -85.05112878;
      static readonly double MaxLatitude = 85.05112878;
      static readonly double MinLongitude = -177;
      static readonly double MaxLongitude = 177;
      static readonly double RAD_DEG = 180 / Math.PI;
      static readonly double DEG_RAD = Math.PI / 180;
      static readonly double MathPiDiv4 = Math.PI / 4;

      GSize tileSize = new GSize(256, 256);
      public override GSize TileSize
      {
         get
         {
            return tileSize;
         }
      }

      public override double Axis
      {
         get
         {
            return 6356752.3142;
         }
      }

      public override double Flattening
      {
         get
         {
            return (1.0 / 298.257223563);
         }
      }

      public override GPoint FromLatLngToPixel(double lat, double lng, int zoom)
      {
         lat = Clip(lat, MinLatitude, MaxLatitude);
         lng = Clip(lng, MinLongitude, MaxLongitude);

         double rLon = lng * DEG_RAD; // Math.PI / 180; 
         double rLat = lat * DEG_RAD; // Math.PI / 180; 

         double a = 6378137;
         double k = 0.0818191908426;

         double z = Math.Tan(MathPiDiv4 + rLat / 2) / Math.Pow((Math.Tan(MathPiDiv4 + Math.Asin(k * Math.Sin(rLat)) / 2)), k);
         double z1 = Math.Pow(2, 23 - zoom);

         double DX = ((20037508.342789 + a * rLon) * 53.5865938 / z1);
         double DY = ((20037508.342789 - a * Math.Log(z)) * 53.5865938 / z1);

         GPoint ret = GPoint.Empty;