GMap.NET.Core/GMap.NET.Projections/MapsLVProjection.cs

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namespace GMap.NET.Projections
{
   using System;

   /// <summary>
   /// GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.01745329251994328,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4326\"]]
   /// PROJCS["LKS92 / Latvia TM",GEOGCS["LKS92",DATUM["D_Latvia_1992",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",24],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",-6000000],UNIT["Meter",1]]
   /// </summary>
   public class LKS92Projection : PureProjection
   {
      public static readonly LKS92Projection Instance = new LKS92Projection();

      static readonly double MinLatitude = 55.55;
      static readonly double MaxLatitude = 58.58;
      static readonly double MinLongitude = 20.22;
      static readonly double MaxLongitude = 28.28;
      static readonly double orignX = 5120900;
      static readonly double orignY = 3998100;

      static readonly double scaleFactor = 0.9996;	                // scale factor				
      static readonly double centralMeridian = 0.41887902047863912;// Center longitude (projection center) 
      static readonly double latOrigin = 0.0;	                   // center latitude			
      static readonly double falseNorthing = -6000000.0;	          // y offset in meters			
      static readonly double falseEasting = 500000.0;	       // x offset in meters			
      static readonly double semiMajor = 6378137.0;		    // major axis
      static readonly double semiMinor = 6356752.3141403561; // minor axis
      static readonly double semiMinor2 = 6356752.3142451793;		// minor axis
      static readonly double metersPerUnit = 1.0;
      static readonly double COS_67P5 = 0.38268343236508977; // cosine of 67.5 degrees
      static readonly double AD_C = 1.0026000;               // Toms region 1 constant

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

      public override double Axis
      {
         get
         {
            return 6378137;
         }
      }

      public override double Flattening
      {
         get
         {
            return (1.0 / 298.257222101);
         }
      }

      public override GPoint FromLatLngToPixel(double lat, double lng, int zoom)
      {
         GPoint ret = GPoint.Empty;