public override void Dispose()
{
if (m_terrainTileService != null)
{
m_terrainTileService.Dispose();
m_terrainTileService = null;
}
}
/// <summary>
/// Initializes a new instance of the <see cref= "T:WorldWind.Terrain.TerrainDownloadRequest"/> class.
/// </summary>
/// <param name="tile"></param>
/// <param name="owner"></param>
/// <param name="row"></param>
/// <param name="col"></param>
/// <param name="targetLevel"></param>
public TerrainDownloadRequest(TerrainTile tile, TerrainTileService owner, int row, int col, int targetLevel) : base(owner)
{
TerrainTile = tile;
download.Url = String.Format(CultureInfo.InvariantCulture,
"{0}?T={1}&L={2}&X={3}&Y={4}",
owner.ServerUrl,
owner.DataSet,
targetLevel, col, row);
}
/// <summary>
/// Initializes a new instance of the <see cref= "T:WorldWind.Terrain.NltTerrainAccessor"/> class.
/// </summary>
/// <param name="name"></param>
/// <param name="west"></param>
/// <param name="south"></param>
/// <param name="east"></param>
/// <param name="north"></param>
/// <param name="terrainTileService"></param>
/// <param name="higherResolutionSubsets"></param>
public NltTerrainAccessor(string name, double west, double south, double east, double north,
TerrainTileService terrainTileService, TerrainAccessor[] higherResolutionSubsets)
{
m_name = name;
m_west = west;
m_south = south;
m_east = east;
m_north = north;
m_terrainTileService = terrainTileService;
m_higherResolutionSubsets = higherResolutionSubsets;
}
/// <summary>
/// Get fast terrain elevation at specified location from already loaded data.
/// Will not trigger any download or data loading from files in cache - just memory.
/// </summary>
/// <param name="latitude">Latitude in decimal degrees.</param>
/// <param name="longitude">Longitude in decimal degrees.</param>
/// <returns>Returns NaN if no tile is available in cache.</returns>
public override float GetCachedElevationAt(double latitude, double longitude)
{
try
{
if (m_terrainTileService == null)
{
return(0);
}
// Use higher res subset if any
if (m_higherResolutionSubsets != null)
{
foreach (TerrainAccessor higherResSub in m_higherResolutionSubsets)
{
if (!higherResSub.IsOn)
{
continue;
}
if (latitude > higherResSub.South && latitude < higherResSub.North &&
longitude > higherResSub.West && longitude < higherResSub.East)
{
return(higherResSub.GetCachedElevationAt(latitude, longitude));
}
}
}
// Look for a tile starting from higher res level, moving down the levels
TerrainTileCacheEntry ttce = null;
for (int targetLevel = m_terrainTileService.NumberLevels - 1; targetLevel >= 0; targetLevel--)
{
// File name and path for that level
double tileSize = m_terrainTileService.LevelZeroTileSizeDegrees * Math.Pow(0.5, targetLevel);
int row = TerrainTileService.GetRowFromLatitude(latitude, tileSize);
int col = TerrainTileService.GetColFromLongitude(longitude, tileSize);
string terrainTileFilePath = string.Format(CultureInfo.InvariantCulture,
@"{0}\{4}\{1:D4}\{1:D4}_{2:D4}.{3}",
m_terrainTileService.TerrainTileDirectory, row, col, m_terrainTileService.FileExtension, targetLevel);
// Look in cache
ttce = (TerrainTileCacheEntry)m_tileCache[terrainTileFilePath];
if (ttce != null)
{
// Tile found, get elevation from it
ttce.LastAccess = DateTime.Now;
return(ttce.TerrainTile.GetElevationAt(latitude, longitude));
}
}
}
catch (Exception)
{
}
// No tile found - sorry.
return(float.NaN);
}
public TerrainTile(TerrainTileService owner)
{
m_owner = owner;
}