基于GMap.NET地图下载器的开发和研究

基于GMap.NET地图下载器的开发和研究

软件下载地址：https://pan.baidu.com/s/1ay0aOm3fiZ35vlfD8kFYFw

1、地图浏览功能

可以浏览谷歌地图、百度、arcgis、bing地图等多种卫星、道路地图。

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2、按照行政区域地图下载

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3、地图瓦片存贮到本地，通过本地缓存永久保存地图数据

     public class MemoryCache : IDisposable
     {
         private FastReaderWriterLock kiberCacheLock;
         private readonly KiberTileCache TilesInMemory;

         public MemoryCache()
         {

             this.TilesInMemory = new KiberTileCache();
             this.kiberCacheLock = new FastReaderWriterLock();
         }

         internal void AddTileToMemoryCache(RawTile tile, byte[] data)
         {
             if (data != null)
             {
                 this.kiberCacheLock.AcquireWriterLock();
                 try
                 {
                     if (!this.TilesInMemory.ContainsKey(tile))
                     {
                         this.TilesInMemory.Add(tile, data);
                     }
                 }
                 finally
                 {
                     this.kiberCacheLock.ReleaseWriterLock();
                 }
             }
         }

         public void Clear()
         {
             this.kiberCacheLock.AcquireWriterLock();
             try
             {
                 this.TilesInMemory.Clear();
             }
             finally
             {
                 this.kiberCacheLock.ReleaseWriterLock();
             }
         }

         public void Dispose()
         {
             this.Dispose(true);
             GC.SuppressFinalize(this);
         }

         private void Dispose(bool disposing)
         {
             if (this.kiberCacheLock != null)
             {
                 if (disposing)
                 {
                     this.Clear();
                 }
                 this.kiberCacheLock.Dispose();
                 this.kiberCacheLock = null;
             }
         }

         ~MemoryCache()
         {
             this.Dispose(false);
         }

         internal byte[] GetTileFromMemoryCache(RawTile tile)
         {
             this.kiberCacheLock.AcquireReaderLock();
             try
             {
                 byte[] buffer = null;
                 if (this.TilesInMemory.TryGetValue(tile, out buffer))
                 {
                     return buffer;
                 }
             }
             finally
             {
                 this.kiberCacheLock.ReleaseReaderLock();
             }
             return null;
         }

         internal void RemoveOverload()
         {
             this.kiberCacheLock.AcquireWriterLock();
             try
             {
                 this.TilesInMemory.RemoveMemoryOverload();
             }
             finally
             {
                 this.kiberCacheLock.ReleaseWriterLock();
             }
         }

         public int Capacity
         {
             get
             {
                 int memoryCacheCapacity;
                 this.kiberCacheLock.AcquireReaderLock();
                 try
                 {
                     memoryCacheCapacity = this.TilesInMemory.MemoryCacheCapacity;
                 }
                 finally
                 {
                     this.kiberCacheLock.ReleaseReaderLock();
                 }
                 return memoryCacheCapacity;
             }
             set
             {
                 this.kiberCacheLock.AcquireWriterLock();
                 try
                 {
                     this.TilesInMemory.MemoryCacheCapacity = value;
                 }
                 finally
                 {
                     this.kiberCacheLock.ReleaseWriterLock();
                 }
             }
         }

         public double Size
         {
             get
             {
                 double memoryCacheSize;
                 this.kiberCacheLock.AcquireReaderLock();
                 try
                 {
                     memoryCacheSize = this.TilesInMemory.MemoryCacheSize;
                 }
                 finally
                 {
                     this.kiberCacheLock.ReleaseReaderLock();
                 }
                 return memoryCacheSize;
             }
         }
     }

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