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

  Program:   Visualization Toolkit
  Module:    vtkAbstractMapper.h

  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 vtkAbstractMapper - abstract class specifies interface to map data
// .SECTION Description
// vtkAbstractMapper is an abstract class to specify interface between data and 
// graphics primitives or software rendering techniques. Subclasses of 
// vtkAbstractMapper can be used for rendering 2D data, geometry, or volumetric
// data.
//
// .SECTION See Also
// vtkAbstractMapper3D vtkMapper vtkPolyDataMapper vtkVolumeMapper

#ifndef __vtkAbstractMapper_h
#define __vtkAbstractMapper_h

#include "vtkAlgorithm.h"

#define VTK_SCALAR_MODE_DEFAULT 0
#define VTK_SCALAR_MODE_USE_POINT_DATA 1
#define VTK_SCALAR_MODE_USE_CELL_DATA 2
#define VTK_SCALAR_MODE_USE_POINT_FIELD_DATA 3
#define VTK_SCALAR_MODE_USE_CELL_FIELD_DATA 4
#define VTK_SCALAR_MODE_USE_FIELD_DATA 5

#define VTK_GET_ARRAY_BY_ID 0
#define VTK_GET_ARRAY_BY_NAME 1

class vtkDataArray;
class vtkDataSet;
class vtkPlane;
class vtkPlaneCollection;
class vtkPlanes;
class vtkTimerLog;
class vtkWindow;

class VTK_FILTERING_EXPORT vtkAbstractMapper : public vtkAlgorithm
{
public:
  vtkTypeMacro(vtkAbstractMapper,vtkAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Override Modifiedtime as we have added Clipping planes
  virtual unsigned long GetMTime();

  // Description:
  // Release any graphics resources that are being consumed by this mapper.
  // The parameter window could be used to determine which graphic
  // resources to release.
  virtual void ReleaseGraphicsResources(vtkWindow *) {};

  // Description:
  // Get the time required to draw the geometry last time it was rendered
  vtkGetMacro( TimeToDraw, double );

  // Description:
  // Specify clipping planes to be applied when the data is mapped
  // (at most 6 clipping planes can be specified).
  void AddClippingPlane(vtkPlane *plane);
  void RemoveClippingPlane(vtkPlane *plane);
  void RemoveAllClippingPlanes();

  // Description:
  // Get/Set the vtkPlaneCollection which specifies the
  // clipping planes.
  virtual void SetClippingPlanes(vtkPlaneCollection*);
  vtkGetObjectMacro(ClippingPlanes,vtkPlaneCollection);

  // Description:
  // An alternative way to set clipping planes: use up to six planes found
  // in the supplied instance of the implicit function vtkPlanes.
  void SetClippingPlanes(vtkPlanes *planes);

  // Description:
  // Make a shallow copy of this mapper.
  void ShallowCopy(vtkAbstractMapper *m);

  // Description:
  // Internal helper function for getting the active scalars. The scalar
  // mode indicates where the scalars come from.  The cellFlag is a 
  // return value that is set when the scalars actually are cell scalars.
  // (0 for point scalars, 1 for cell scalars, 2 for field scalars)
  // The arrayAccessMode is used to indicate how to retrieve the scalars from 
  // field data, per id or per name (if the scalarMode indicates that).
  static vtkDataArray *GetScalars(vtkDataSet *input, int scalarMode,
                                  int arrayAccessMode, int arrayId, 
                                  const char *arrayName, int& cellFlag);

protected:
  vtkAbstractMapper();
  ~vtkAbstractMapper();

  vtkTimerLog *Timer;
  double TimeToDraw;
  vtkWindow *LastWindow;   // Window used for the previous render
  vtkPlaneCollection *ClippingPlanes;

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

#endif