GMap.NET.Core/GMap.NET.Projections/MapyCZProjection.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["Mapy.cz",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",15],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",134400000],PARAMETER["false_northing",-41600000],UNIT["1/32meter",0.03125]]
   /// </summary>
   public class MapyCZProjection : PureProjection
   {
      public static readonly MapyCZProjection Instance = new MapyCZProjection();

      static readonly double MinLatitude = 26;
      static readonly double MaxLatitude = 76;
      static readonly double MinLongitude = -26;
      static readonly double MaxLongitude = 38;

      #region -- Common --
      static int getLCM(int zone)
      {
         if((zone < 1) || (zone > 60))
         {
            throw new Exception("MapyCZProjection: UTM Zone number is not between 1 and 60.");
         }
         else
         {
            return ((zone * 6) - 183);
         }
      }

      static double roundoff(double xx, double yy)
      {
         var x = xx;
         var y = yy;
         x = Math.Round(x * Math.Pow(10, y)) / Math.Pow(10, y);
         return x;
      }

      static readonly double UTMSIZE = 2;
      static readonly double UNITS = 1;

      #endregion

      #region -- WGSToMapyCZ --

      public long[] WGSToPP(double la, double lo)
      {
         var utmEE = wgsToUTM(DegreesToRadians(la), DegreesToRadians(lo), 33);
         var pp = utmEEToPP(utmEE[0], utmEE[1]);
         return pp;
      }

      static long[] utmEEToPP(double east, double north)
      {
         var x = (Math.Round(east) - (-3700000.0)) * Math.Pow(2, 5);
         var y = (Math.Round(north) - (1300000.0)) * Math.Pow(2, 5);

         return new long[] { (long)x, (long)y };
      }