public void Dispose()
{
if (request != null)
{
request.Dispose();
request = null;
}
GC.SuppressFinalize(this);
}
/// <summary>
/// This method initializes the terrain tile add switches to
/// Initialize floating point/int 16 tiles
/// </summary>
public void Initialize()
{
if (IsInitialized)
{
return;
}
if (!File.Exists(TerrainTileFilePath))
{
// Download elevation
if (request == null)
{
using (request = new TerrainDownloadRequest(this, m_owner, Row, Col, TargetLevel))
{
request.SaveFilePath = TerrainTileFilePath;
request.DownloadInForeground();
}
}
}
if (ElevationData == null)
{
ElevationData = new float[SamplesPerTile, SamplesPerTile];
}
if (File.Exists(TerrainTileFilePath))
{
// Load elevation file
try
{
// TerrainDownloadRequest's FlagBadTile() creates empty files
// as a way to flag "bad" terrain tiles.
// Remove the empty 'flag' files after preset time.
try
{
FileInfo tileInfo = new FileInfo(TerrainTileFilePath);
if (tileInfo.Length == 0)
{
TimeSpan age = DateTime.Now.Subtract(tileInfo.LastWriteTime);
if (age < m_owner.TerrainTileRetryInterval)
{
// This tile is still flagged bad
IsInitialized = true;
}
else
{
// remove the empty 'flag' file
File.Delete(TerrainTileFilePath);
}
return;
}
}
catch
{
// Ignore any errors in the above block, and continue.
// For example, if someone had the empty 'flag' file
// open, the delete would fail.
}
using (Stream s = File.OpenRead(TerrainTileFilePath))
{
BinaryReader reader = new BinaryReader(s);
if (m_owner.DataType == "Int16")
{
/*
* byte[] tfBuffer = new byte[SamplesPerTile*SamplesPerTile*2];
* if (s.Read(tfBuffer,0,tfBuffer.Length) < tfBuffer.Length)
* throw new IOException(string.Format("End of file error while reading terrain file '{0}'.", TerrainTileFilePath) );
*
* int offset = 0;
* for(int y = 0; y < SamplesPerTile; y++)
* for(int x = 0; x < SamplesPerTile; x++)
* ElevationData[x,y] = tfBuffer[offset++] + (short)(tfBuffer[offset++]<<8);
*/
for (int y = 0; y < SamplesPerTile; y++)
{
for (int x = 0; x < SamplesPerTile; x++)
{
ElevationData[x, y] = reader.ReadInt16();
}
}
}
if (m_owner.DataType == "Float32")
{
/*
* byte[] tfBuffer = new byte[SamplesPerTile*SamplesPerTile*4];
* if (s.Read(tfBuffer,0,tfBuffer.Length) < tfBuffer.Length)
* throw new IOException(string.Format("End of file error while reading terrain file '{0}'.", TerrainTileFilePath) );
*/
for (int y = 0; y < SamplesPerTile; y++)
{
for (int x = 0; x < SamplesPerTile; x++)
{
ElevationData[x, y] = reader.ReadSingle();
}
}
}
IsInitialized = true;
IsValid = true;
}
return;
}
catch (IOException)
{
// If there is an IO exception when reading the terrain tile,
// then either something is wrong with the file, or with
// access to the file, so try and remove it.
try
{
File.Delete(TerrainTileFilePath);
}
catch (Exception ex)
{
throw new ApplicationException(String.Format("Error while trying to delete corrupt terrain tile {0}", TerrainTileFilePath), ex);
}
}
catch (Exception ex)
{
// Some other type of error when reading the terrain tile.
throw new ApplicationException(String.Format("Error while trying to read terrain tile {0}", TerrainTileFilePath), ex);
}
}
}
