/// <summary>
/// Constructing an ObjectGrid this way assumes the values are not in ram and will
/// simply buffer 3 rows.
/// </summary>
/// <param name="sourceRaster"></param>
public ShortValueGrid(ShortRaster sourceRaster)
{
_sourceRaster = sourceRaster;
if (sourceRaster.IsInRam == true)
{
// we will just be forwarding requests to the data array
}
else
{
_rowBuffer = new short[3][];
_topRow = 0;
for (int row = 0; row < 3; row++)
{
_rowBuffer[row] = _sourceRaster.ReadRow(row);
}
}
}
// ----------------------------------- FROM AND TO IN RAM ONLY ---------------------------------
/// <summary>
/// This creates an IN MEMORY ONLY window from the in-memory window of this raster. If, however, the requested range
/// is outside of what is contained in the in-memory portions of this raster, an appropriate cast
/// is required to ensure that you have the correct File handling, like a BinaryRaster etc.
/// </summary>
/// <param name="startRow">The 0 based integer index of the top row to get from this raster. If this raster is itself a window, 0 represents the startRow from the file.</param>
/// <param name="endRow">The integer index of the bottom row to get from this raster. The largest allowed value is NumRows - 1.</param>
/// <param name="startColumn">The 0 based integer index of the leftmost column to get from this raster. If this raster is a window, 0 represents the startColumn from the file.</param>
/// <param name="endColumn">The 0 based integer index of the rightmost column to get from this raster. The largest allowed value is NumColumns - 1</param>
/// <param name="inRam">Boolean. If this is true and the window is small enough, a copy of the values will be loaded To memory.</param>
/// <returns>An implementation of IRaster</returns>
public IRaster GetWindow(int startRow, int endRow, int startColumn, int endColumn, bool inRam)
{
if (IsInRam == false)
{
throw new ArgumentException(MessageStrings.RasterRequiresCast);
}
if (startRow < StartRow || endRow > EndRow || StartColumn < startColumn || EndColumn > endColumn)
{
// the requested extents are outside of the extents that have been windowed into ram. File Handling is required.
throw new ArgumentException(MessageStrings.RasterRequiresCast);
}
int numCols = endColumn - startColumn + 1;
int numRows = endRow - startRow + 1;
ShortRaster result = new ShortRaster(numRows, numCols);
result.Filename = Filename;
result.Projection = Projection;
result.DataType = typeof(short);
result.NumRows = numRows;
result.NumColumns = numCols;
result.NumRowsInFile = NumRowsInFile;
result.NumColumnsInFile = NumColumnsInFile;
result.NoDataValue = NoDataValue;
result.StartColumn = startColumn;
result.StartRow = startRow;
result.EndColumn = endColumn;
result.EndRow = EndRow;
result.FileType = FileType;
// Reposition the new "raster" so that it matches the specified window, not the whole raster
// X = [0] + [1] * column + [2] * row;
// Y = [3] + [4] * column + [5] * row;
result.Bounds = new RasterBounds(result.NumRows, result.NumColumns, new double[6]);
result.Bounds.AffineCoefficients[0] = Bounds.AffineCoefficients[0] + Bounds.AffineCoefficients[1] * startColumn + Bounds.AffineCoefficients[2] * startRow;
result.Bounds.AffineCoefficients[1] = Bounds.AffineCoefficients[1];
result.Bounds.AffineCoefficients[2] = Bounds.AffineCoefficients[2];
result.Bounds.AffineCoefficients[3] = Bounds.AffineCoefficients[3] + Bounds.AffineCoefficients[4] * startColumn + Bounds.AffineCoefficients[5] * startRow;
result.Bounds.AffineCoefficients[4] = Bounds.AffineCoefficients[4];
result.Bounds.AffineCoefficients[5] = Bounds.AffineCoefficients[5];
// Now we can copy any values currently in memory.
ProgressMeter pm = new ProgressMeter(ProgressHandler, MessageStrings.CopyingValues, endRow);
pm.StartValue = startRow;
// copy values directly using both data structures
for (int row = 0; row < numRows; row++)
{
for (int col = 0; col < numCols; col++)
{
result.Data[row][col] = Data[startRow + row][startColumn + col];
}
pm.CurrentValue = row;
}
pm.Reset();
result.Value = new ShortValueGrid(result);
return result;
}
// ------------------------------------------FROM AND TO IN RAM ONLY -----------------
/// <summary>
/// This creates a completely new raster from the windowed domain on the original raster. This new raster
/// will not have a source file, and values like NumRowsInFile will correspond to the in memory version.
/// All the values will be copied to the new source file. InRam must be true at this level.
/// </summary>
/// <param name="filename"></param>
/// <param name="startRow">The 0 based integer index of the top row to copy from this raster. If this raster is itself a window, 0 represents the startRow from the file.</param>
/// <param name="endRow">The integer index of the bottom row to copy from this raster. The largest allowed value is NumRows - 1.</param>
/// <param name="startColumn">The 0 based integer index of the leftmost column to copy from this raster. If this raster is a window, 0 represents the startColumn from the file.</param>
/// <param name="endColumn">The 0 based integer index of the rightmost column to copy from this raster. The largest allowed value is NumColumns - 1</param>
/// <param name="copyValues">If this is true, the valeus are saved to the file. If this is false and the data can be loaded into Ram, no file handling is done. Otherwise, a file of NoData values is created.</param>
/// <param name="inRam">Boolean. If this is true and the window is small enough, a copy of the values will be loaded into memory.</param>
/// <returns>An implementation of IRaster</returns>
public IRaster CopyWindow(string filename, int startRow, int endRow, int startColumn, int endColumn, bool copyValues, bool inRam)
{
if (inRam == false || (endColumn - startColumn + 1) * (endRow - startRow + 1) > 64000000)
{
throw new ArgumentException(MessageStrings.RasterRequiresCast);
}
if (IsInRam == false)
{
throw new ArgumentException(MessageStrings.RasterRequiresCast);
}
int numCols = endColumn - startColumn + 1;
int numRows = endRow - startRow + 1;
ShortRaster result = new ShortRaster(numRows, numCols);
result.Projection = Projection;
// The affine coefficients defining the world file are the same except that they are translated over. Only the position of the
// upper left corner changes. Everything else is the same as the previous raster.
// X = [0] + [1] * column + [2] * row;
// Y = [3] + [4] * column + [5] * row;
result.Bounds = new RasterBounds(result.NumRows, result.NumColumns, new double[6]);
result.Bounds.AffineCoefficients[0] = Bounds.AffineCoefficients[0] + Bounds.AffineCoefficients[1] * startColumn + Bounds.AffineCoefficients[2] * startRow;
result.Bounds.AffineCoefficients[1] = Bounds.AffineCoefficients[1];
result.Bounds.AffineCoefficients[2] = Bounds.AffineCoefficients[2];
result.Bounds.AffineCoefficients[3] = Bounds.AffineCoefficients[3] + Bounds.AffineCoefficients[4] * startColumn + Bounds.AffineCoefficients[5] * startRow;
result.Bounds.AffineCoefficients[4] = Bounds.AffineCoefficients[4];
result.Bounds.AffineCoefficients[5] = Bounds.AffineCoefficients[5];
ProgressMeter pm = new ProgressMeter(ProgressHandler, MessageStrings.CopyingValues, numRows);
// copy values directly using both data structures
for (int row = 0; row < numRows; row++)
{
for (int col = 0; col < numCols; col++)
{
result.Data[row][col] = Data[startRow + row][startColumn + col];
}
pm.CurrentValue = row;
}
pm.Reset();
result.Value = new ShortValueGrid(result);
return result;
}
