/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkDataWriter.h,v $

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkDataWriter - helper class for objects that write vtk data files
// .SECTION Description
// vtkDataWriter is a helper class that opens and writes the vtk header and 
// point data (e.g., scalars, vectors, normals, etc.) from a vtk data file. 
// See text for various formats.

// .SECTION See Also
// vtkDataSetWriter vtkPolyDataWriter vtkStructuredGridWriter
// vtkStructuredPointsWriter vtkUnstructuredGridWriter
// vtkFieldDataWriter vtkRectilinearGridWriter

#ifndef __vtkDataWriter_h
#define __vtkDataWriter_h

#include "vtkWriter.h"

class vtkDataSet;
class vtkPoints;
class vtkCellArray;
class vtkDataArray;
class vtkFieldData;

class VTK_IO_EXPORT vtkDataWriter : public vtkWriter
{
public:
  vtkTypeRevisionMacro(vtkDataWriter,vtkWriter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Created object with default header, ASCII format, and default names for 
  // scalars, vectors, tensors, normals, and texture coordinates.
  static vtkDataWriter *New();

  // Description:
  // Specify file name of vtk polygon data file to write.
  vtkSetStringMacro(FileName);
  vtkGetStringMacro(FileName);

  // Description:
  // Enable writing to an OutputString instead of the default, a file.
  vtkSetMacro(WriteToOutputString,int);
  vtkGetMacro(WriteToOutputString,int);
  vtkBooleanMacro(WriteToOutputString,int);

  // Description:
  // When WriteToOutputString in on, then a string is allocated, written to,
  // and can be retrieved with these methods.  The string is deleted during
  // the next call to write ...
  vtkGetMacro(OutputStringLength, int);  
  vtkGetStringMacro(OutputString);
  unsigned char *GetBinaryOutputString() {
      return (unsigned char *)this->OutputString;};
      
  // Description:
  // This convenience method returns the string, sets the IVAR to NULL,
  // so that the user is responsible for deleting the string.
  // I am not sure what the name should be, so it may change in the future.
  char *RegisterAndGetOutputString();
  
  // Description:
  // Specify the header for the vtk data file.
  vtkSetStringMacro(Header);
  vtkGetStringMacro(Header);

  // Description:
  // Specify file type (ASCII or BINARY) for vtk data file.
  vtkSetClampMacro(FileType,int,VTK_ASCII,VTK_BINARY);
  vtkGetMacro(FileType,int);
  void SetFileTypeToASCII() {this->SetFileType(VTK_ASCII);};
  void SetFileTypeToBinary() {this->SetFileType(VTK_BINARY);};

  // Description:
  // Give a name to the scalar data. If not specified, uses default
  // name "scalars".
  vtkSetStringMacro(ScalarsName);
  vtkGetStringMacro(ScalarsName);

  // Description:
  // Give a name to the vector data. If not specified, uses default
  // name "vectors".
  vtkSetStringMacro(VectorsName);
  vtkGetStringMacro(VectorsName);

  // Description:
  // Give a name to the tensors data. If not specified, uses default
  // name "tensors".
  vtkSetStringMacro(TensorsName);
  vtkGetStringMacro(TensorsName);

  // Description:
  // Give a name to the normals data. If not specified, uses default
  // name "normals".
  vtkSetStringMacro(NormalsName);
  vtkGetStringMacro(NormalsName);

  // Description:
  // Give a name to the texture coordinates data. If not specified, uses 
  // default name "textureCoords".
  vtkSetStringMacro(TCoordsName);
  vtkGetStringMacro(TCoordsName);

  // Description:
  // Give a name to the lookup table. If not specified, uses default
  // name "lookupTable".
  vtkSetStringMacro(LookupTableName);
  vtkGetStringMacro(LookupTableName);

  // Description:
  // Give a name to the field data. If not specified, uses default 
  // name "field".
  vtkSetStringMacro(FieldDataName);
  vtkGetStringMacro(FieldDataName);

  // Description:
  // Open a vtk data file. Returns NULL if error.
  virtual ostream *OpenVTKFile();

  // Description:
  // Write the header of a vtk data file. Returns 0 if error.
  int WriteHeader(ostream *fp);

  // Description:
  // Write out the points of the data set.
  int WritePoints(ostream *fp, vtkPoints *p);

  // Description:
  // Write out coordinates for rectilinear grids.
  int WriteCoordinates(ostream *fp, vtkDataArray *coords, int axes);

  // Description:
  // Write out the cells of the data set.
  int WriteCells(ostream *fp, vtkCellArray *cells, const char *label);

  // Description:
  // Write the cell data (e.g., scalars, vectors, ...) of a vtk dataset.
  // Returns 0 if error.
  int WriteCellData(ostream *fp, vtkDataSet *ds);

  // Description:
  // Write the point data (e.g., scalars, vectors, ...) of a vtk dataset.
  // Returns 0 if error.
  int WritePointData(ostream *fp, vtkDataSet *ds);

  // Description:
  // Write out the field data.
  int WriteFieldData(ostream *fp, vtkFieldData *f);

  // Description:
  // Write out the data associated with the dataset (i.e. field data owned by
  // the dataset itself - distinct from that owned by the cells or points).
  int WriteDataSetData(ostream *fp, vtkDataSet *ds);

  // Description:
  // Close a vtk file.
  void CloseVTKFile(ostream *fp);


protected:
  vtkDataWriter();
  ~vtkDataWriter();

  int WriteToOutputString;
  char *OutputString;
  int OutputStringLength;
  int OutputStringAllocatedLength;
  
  void WriteData(); //dummy method to allow this class to be instantiated and delegated to

  char *FileName;
  char *Header;
  int FileType;

  char *ScalarsName;
  char *VectorsName;
  char *TensorsName;
  char *TCoordsName;
  char *NormalsName;
  char *LookupTableName;
  char *FieldDataName;

  int WriteArray(ostream *fp, int dataType, vtkDataArray *data, const char *format, 
                 int num, int numComp);
  int WriteScalarData(ostream *fp, vtkDataArray *s, int num);
  int WriteVectorData(ostream *fp, vtkDataArray *v, int num);
  int WriteNormalData(ostream *fp, vtkDataArray *n, int num);
  int WriteTCoordData(ostream *fp, vtkDataArray *tc, int num);
  int WriteTensorData(ostream *fp, vtkDataArray *t, int num);

private:
  vtkDataWriter(const vtkDataWriter&);  // Not implemented.
  void operator=(const vtkDataWriter&);  // Not implemented.
};

#endif