public ImageTileInfo GetImageTileInfo(int level, int row, int col, bool allowCache)
{
if (level >= m_numberLevels)
{
throw new ArgumentException("Level " + level.ToString() + " not available.");
}
string relativePath = String.Format(@"{0}\{1:D4}\{1:D4}_{2:D4}.{3}", level, row, col, m_imageFileExtension);
if (m_dataDirectory != null)
{
// Search data directory first
string rawFullPath = Path.Combine(m_dataDirectory, relativePath);
if (File.Exists(rawFullPath))
{
return(new ImageTileInfo(rawFullPath));
}
}
// Try cache with default file extension
string cacheFullPath = Path.Combine(m_cacheDirectory, relativePath);
if (File.Exists(cacheFullPath))
{
return(new ImageTileInfo(cacheFullPath));
}
// Try cache but accept any valid image file extension
const string ValidExtensions = ".bmp.dds.dib.hdr.jpg.jpeg.pfm.png.ppm.tga.gif.tif";
if (allowCache)
{
string cacheSearchPath = Path.GetDirectoryName(cacheFullPath);
if (Directory.Exists(cacheSearchPath))
{
foreach (string imageFile in Directory.GetFiles(
cacheSearchPath,
Path.GetFileNameWithoutExtension(cacheFullPath) + ".*"))
{
string extension = Path.GetExtension(imageFile).ToLower();
if (ValidExtensions.IndexOf(extension) < 0)
{
continue;
}
if (m_imageTileService != null)
{
return(new ImageTileInfo(
imageFile,
m_imageTileService.GetImageTileServiceUri(level, row, col)));
}
if (m_wmsLayerAccessor != null)
{
double tileRange = m_levelZeroTileSizeDegrees * Math.Pow(0.5, level);
double west = -180.0 + col * tileRange;
double south = -90.0 + row * tileRange;
string fileUri = m_wmsLayerAccessor.GetWMSRequestUrl(
west, south, west + tileRange, south + tileRange,
m_textureSizePixels, m_textureSizePixels);
return(new ImageTileInfo(imageFile, fileUri));
}
return(new ImageTileInfo(imageFile));
}
}
}
if (m_imageTileService != null)
{
return(new ImageTileInfo(
cacheFullPath,
m_imageTileService.GetImageTileServiceUri(level, row, col)));
}
if (m_wmsLayerAccessor != null)
{
double tileRange = m_levelZeroTileSizeDegrees * Math.Pow(0.5, level);
double west = -180.0 + col * tileRange;
double south = -90.0 + row * tileRange;
string fileUri = m_wmsLayerAccessor.GetWMSRequestUrl(
west, south, west + tileRange, south + tileRange,
m_textureSizePixels, m_textureSizePixels);
return(new ImageTileInfo(Path.Combine(m_cacheDirectory, relativePath), fileUri));
}
// No success, return our "duplicate" tile if any
if (m_duplicateTexturePath != null && File.Exists(m_duplicateTexturePath))
{
return(new ImageTileInfo(m_duplicateTexturePath,
Path.Combine(m_cacheDirectory, m_duplicateTexturePath)));
}
return(null);
//throw new ApplicationException("No image access method available.");
}