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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.
=========================================================================*/
/**
* @class vtkUnstructuredGridVolumeRayCastIterator
*
*
*
* vtkUnstructuredGridVolumeRayCastIterator is a superclass for iterating
* over the intersections of a viewing ray with a group of unstructured
* cells. These iterators are created with a
* vtkUnstructuredGridVolumeRayCastFunction.
*
* @sa
* vtkUnstructuredGridVolumeRayCastFunction
*
*/
#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);
virtual void PrintSelf(ostream &os, vtkIndent indent);
/**
* Initializes the iteration to the start of the ray at the given screen
* coordinates.
*/
virtual void Initialize(int x, int y) = 0;
/**
* Get the intersections of the next several cells. The cell ids are
* stored in \c intersectedCells and the length of each ray segment
* within the cell is stored in \c intersectionLengths. The point
* scalars \c scalars are interpolated and stored in \c nearIntersections
* and \c farIntersections. \c intersectedCells, \c intersectionLengths,
* or \c scalars may be \c NULL to suppress passing the associated
* information. The number of intersections actually encountered is
* returned. 0 is returned if and only if no more intersections are to
* be found.
*/
virtual vtkIdType GetNextIntersections(vtkIdList *intersectedCells,
vtkDoubleArray *intersectionLengths,
vtkDataArray *scalars,
vtkDataArray *nearIntersections,
vtkDataArray *farIntersections) = 0;
//@{
/**
* Set/get the bounds of the cast ray (in viewing coordinates). By
* default the range is [0,1].
*/
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();
double Bounds[2];
vtkIdType MaxNumberOfIntersections;
private:
vtkUnstructuredGridVolumeRayCastIterator(const vtkUnstructuredGridVolumeRayCastIterator&) VTK_DELETE_FUNCTION;
void operator=(const vtkUnstructuredGridVolumeRayCastIterator&) VTK_DELETE_FUNCTION;
};
#endif //vtkUnstructuredGridRayCastIterator_h
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