vtkUnstructuredGridVolumeRayCastIterator.h

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// -*- c++ -*-

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

  Program:   Visualization Toolkit
  Module:    vtkUnstructuredGridVolumeRayCastIterator.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.

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

#ifndef vtkUnstructuredGridVolumeRayCastIterator_h
#define vtkUnstructuredGridVolumeRayCastIterator_h

#include "vtkRenderingVolumeModule.h" // For export macro
#include "vtkObject.h"

class vtkIdList;
class vtkDoubleArray;
class vtkDataArray;

class VTKRENDERINGVOLUME_EXPORT vtkUnstructuredGridVolumeRayCastIterator : public vtkObject
{
public:
  vtkTypeMacro(vtkUnstructuredGridVolumeRayCastIterator, vtkObject);
  void PrintSelf(ostream &os, vtkIndent indent) override;

  virtual void Initialize(int x, int y) = 0;

  virtual vtkIdType GetNextIntersections(vtkIdList *intersectedCells,
                                         vtkDoubleArray *intersectionLengths,
                                         vtkDataArray *scalars,
                                         vtkDataArray *nearIntersections,
                                         vtkDataArray *farIntersections) = 0;


  vtkSetVector2Macro(Bounds, double);
  vtkGetVector2Macro(Bounds, double);

  // Descrption:
  // Set/get the maximum number of intersections returned with a call to
  // GetNextIntersections.  Set to 32 by default.
  vtkSetMacro(MaxNumberOfIntersections, vtkIdType);
  vtkGetMacro(MaxNumberOfIntersections, vtkIdType);

protected:
  vtkUnstructuredGridVolumeRayCastIterator();
  ~vtkUnstructuredGridVolumeRayCastIterator() override;

  double Bounds[2];

  vtkIdType MaxNumberOfIntersections;

private:
  vtkUnstructuredGridVolumeRayCastIterator(const vtkUnstructuredGridVolumeRayCastIterator&) = delete;
  void operator=(const vtkUnstructuredGridVolumeRayCastIterator&) = delete;
};

#endif //vtkUnstructuredGridRayCastIterator_h