GMap.NET.Core/GMap.NET/PureProjection.cs

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namespace GMap.NET
{
   using System;
   using System.Collections.Generic;
   using System.Diagnostics;

   /// <summary>
   /// defines projection
   /// </summary>
   public abstract class PureProjection
   {
      readonly List<Dictionary<PointLatLng, GPoint>> FromLatLngToPixelCache = new List<Dictionary<PointLatLng, GPoint>>(33);
      readonly List<Dictionary<GPoint, PointLatLng>> FromPixelToLatLngCache = new List<Dictionary<GPoint, PointLatLng>>(33);

      public PureProjection()
      {
         for(int i = 0; i < FromLatLngToPixelCache.Capacity; i++)
         {
            FromLatLngToPixelCache.Add(new Dictionary<PointLatLng, GPoint>());
            FromPixelToLatLngCache.Add(new Dictionary<GPoint, PointLatLng>());
         }
      }

      /// <summary>
      /// size of tile
      /// </summary>
      public abstract GSize TileSize
      {
         get;
      }

      /// <summary>
      /// Semi-major axis of ellipsoid, in meters
      /// </summary>
      public abstract double Axis
      {
         get;
      }

      /// <summary>
      /// Flattening of ellipsoid
      /// </summary>
      public abstract double Flattening
      {
         get;
      }

      /// <summary>
      /// get pixel coordinates from lat/lng
      /// </summary>
      /// <param name="lat"></param>
      /// <param name="lng"></param>
      /// <param name="zoom"></param>
      /// <returns></returns>
      public abstract GPoint FromLatLngToPixel(double lat, double lng, int zoom);

      /// <summary>
      /// gets lat/lng coordinates from pixel coordinates
      /// </summary>