private bool CalculateTileBBox(int level, int row, int col, out double xmin, out double ymin, out double xmax, out double ymax)
{
//calculate the bbox
bool ret = false;
if (level >= 0 && level < _service.DataSource.TilingScheme.LODs.Length)
{
double resolution = _service.DataSource.TilingScheme.LODs[level].Resolution;
PBS.Util.Point origin = _service.DataSource.TilingScheme.TileOrigin;
int tileRows = _service.DataSource.TilingScheme.TileRows;
int tileCols = _service.DataSource.TilingScheme.TileCols;
xmin = origin.X + resolution * tileCols * col;
ymin = origin.Y - resolution * tileRows * (row + 1);
xmax = origin.X + resolution * tileCols * (col + 1);
ymax = origin.Y - resolution * tileRows * row;
ret = true;
}
else
{
xmin = double.NaN;
ymin = double.NaN;
xmax = double.NaN;
ymax = double.NaN;
}
return(ret);
}
private void CalculateTileBBox(int level, int row, int col, out double xmin, out double ymin, out double xmax, out double ymax)
{
//calculate the bbox
double resolution = _service.DataSource.TilingScheme.LODs[level].Resolution;
PBS.Util.Point origin = _service.DataSource.TilingScheme.TileOrigin;
int tileRows = _service.DataSource.TilingScheme.TileRows;
int tileCols = _service.DataSource.TilingScheme.TileCols;
xmin = origin.X + resolution * tileCols * col;
ymin = origin.Y - resolution * tileRows * (row + 1);
xmax = origin.X + resolution * tileCols * (col + 1);
ymax = origin.Y - resolution * tileRows * row;
}
/// <summary>
///
/// </summary>
/// <param name="levels"></param>
/// <param name="extent">sr=3857</param>
/// <returns></returns>
public static long CalculateTileCount(int[] levels, ESRI.ArcGIS.Client.Geometry.Envelope extent)
{
long total = 0;
int constTileSize = 256;
LODInfo[] LODs = new LODInfo[20];
const double cornerCoordinate = 20037508.3427892;
double resolution = cornerCoordinate * 2 / 256;
double scale = 591657527.591555;
for (int i = 0; i < LODs.Length; i++)
{
LODs[i] = new LODInfo()
{
Resolution = resolution,
LevelID = i,
Scale = scale
};
resolution /= 2;
scale /= 2;
}
PBS.Util.Point TileOrigin = new PBS.Util.Point(-cornerCoordinate, cornerCoordinate);
foreach (int level in levels)
{
LODInfo lod = LODs[level];
double oneTileDistance = lod.Resolution * constTileSize;
//calculate start tile and end tile
int startTileRow = (int)(Math.Abs(TileOrigin.Y - extent.YMax) / oneTileDistance);
int startTileCol = (int)(Math.Abs(TileOrigin.X - extent.XMin) / oneTileDistance);
int endTileRow = (int)(Math.Abs(TileOrigin.Y - extent.YMin) / oneTileDistance);
int endTileCol = (int)(Math.Abs(TileOrigin.X - extent.XMax) / oneTileDistance);
//"startR,startC,endR,endC"
total += Math.Abs((endTileCol - startTileCol + 1) * (endTileRow - startTileRow + 1));
}
return(total);
}
