Beispiel #1
0
        public void ReadHeader()
        {
            List <long> tileOffsets = new List <long>();

            _mapFile.StreamReader.Position = ZoomIntervalConfig.AbsStartPositionSubFile;
            MinX = (int)MapFile.GetTileX((double)_mapFile.Header.MinLon, ZoomIntervalConfig.BaseZoomLevel);
            MaxX = (int)MapFile.GetTileX((double)_mapFile.Header.MaxLon, ZoomIntervalConfig.BaseZoomLevel);
            MinY = (int)MapFile.GetTileY((double)_mapFile.Header.MaxLat, ZoomIntervalConfig.BaseZoomLevel);
            MaxY = (int)MapFile.GetTileY((double)_mapFile.Header.MinLat, ZoomIntervalConfig.BaseZoomLevel);
            if (_mapFile.Header.DebugInformationPresent)
            {
                TileIndexSignature = _mapFile.ReadFixedString(16);
            }
            else
            {
                TileIndexSignature = null;
            }
            long hTiles     = MaxX - MinX + 1;
            long vTiles     = MaxY - MinY + 1;
            long blockCount = hTiles * vTiles;
            long endOfIndex = ZoomIntervalConfig.AbsStartPositionSubFile + (blockCount * 5);

            //tile entries
            byte[] buffer = new byte[8];
            while (_mapFile.StreamReader.Position < endOfIndex)
            {
                Array.Clear(buffer, 0, 8);
                _mapFile.StreamReader.Read(buffer, 3, 5);
                long offset;
                if ((buffer[3] & 0x80) == 0x80)
                {
                    //in water
                    offset = 0;
                }
                else
                {
                    offset = BitConverter.ToInt64(MapFile.ReverseBytes(buffer, 0, 8), 0);
                }
                tileOffsets.Add(offset);
            }
            _tileAbsOffsets = tileOffsets.ToArray();
        }
Beispiel #2
0
 private static double toRelTileX(double longitude, long tileX, int zoom)
 {
     return((MapFile.GetTileX(longitude / 1000000.0, zoom) - tileX) * 256.0);
 }