GMap.NET.Core/GMap.NET.Internals/TileMatrix.cs

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

   /// <summary>
   /// matrix for tiles
   /// </summary>
   internal class TileMatrix : IDisposable
   {
      List<Dictionary<GPoint, Tile>> Levels = new List<Dictionary<GPoint, Tile>>(33);
      FastReaderWriterLock Lock = new FastReaderWriterLock();

      public TileMatrix()
      {
         for(int i = 0; i < Levels.Capacity; i++)
         {
            Levels.Add(new Dictionary<GPoint, Tile>(55));
         }
      }

      public void ClearAllLevels()
      {
         Lock.AcquireWriterLock();
         try
         {
            foreach(var matrix in Levels)
            {
               foreach(var t in matrix)
               {
                  t.Value.Dispose();
               }
               matrix.Clear();
            }
         }
         finally
         {
            Lock.ReleaseWriterLock();
         }
      }

      public void ClearLevel(int zoom)
      {
         Lock.AcquireWriterLock();
         try
         {
            if(zoom < Levels.Count)
            {
               var l = Levels[zoom];

               foreach(var t in l)
               {
                  t.Value.Dispose();
               }

               l.Clear();
            }