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100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
// -*- c++ -*-
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkUnstructuredGridVolumeRayCastIterator.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkUnstructuredGridVolumeRayCastIterator
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*
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*
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*
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* vtkUnstructuredGridVolumeRayCastIterator is a superclass for iterating
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* over the intersections of a viewing ray with a group of unstructured
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* cells. These iterators are created with a
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* vtkUnstructuredGridVolumeRayCastFunction.
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*
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* @sa
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* vtkUnstructuredGridVolumeRayCastFunction
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*
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*/
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#ifndef vtkUnstructuredGridVolumeRayCastIterator_h
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#define vtkUnstructuredGridVolumeRayCastIterator_h
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#include "vtkObject.h"
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#include "vtkRenderingVolumeModule.h" // For export macro
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class vtkIdList;
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class vtkDoubleArray;
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class vtkDataArray;
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class VTKRENDERINGVOLUME_EXPORT vtkUnstructuredGridVolumeRayCastIterator : public vtkObject
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{
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public:
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vtkTypeMacro(vtkUnstructuredGridVolumeRayCastIterator, vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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/**
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* Initializes the iteration to the start of the ray at the given screen
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* coordinates.
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*/
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virtual void Initialize(int x, int y) = 0;
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/**
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* Get the intersections of the next several cells. The cell ids are
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* stored in \c intersectedCells and the length of each ray segment
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* within the cell is stored in \c intersectionLengths. The point
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* scalars \c scalars are interpolated and stored in \c nearIntersections
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* and \c farIntersections. \c intersectedCells, \c intersectionLengths,
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* or \c scalars may be \c NULL to suppress passing the associated
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* information. The number of intersections actually encountered is
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* returned. 0 is returned if and only if no more intersections are to
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* be found.
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*/
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virtual vtkIdType GetNextIntersections(vtkIdList* intersectedCells,
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vtkDoubleArray* intersectionLengths, vtkDataArray* scalars, vtkDataArray* nearIntersections,
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vtkDataArray* farIntersections) = 0;
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//@{
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/**
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* Set/get the bounds of the cast ray (in viewing coordinates). By
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* default the range is [0,1].
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*/
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vtkSetVector2Macro(Bounds, double);
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vtkGetVector2Macro(Bounds, double);
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//@}
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// Descrption:
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// Set/get the maximum number of intersections returned with a call to
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// GetNextIntersections. Set to 32 by default.
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vtkSetMacro(MaxNumberOfIntersections, vtkIdType);
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vtkGetMacro(MaxNumberOfIntersections, vtkIdType);
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protected:
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vtkUnstructuredGridVolumeRayCastIterator();
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~vtkUnstructuredGridVolumeRayCastIterator() override;
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double Bounds[2];
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vtkIdType MaxNumberOfIntersections;
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private:
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vtkUnstructuredGridVolumeRayCastIterator(
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const vtkUnstructuredGridVolumeRayCastIterator&) = delete;
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void operator=(const vtkUnstructuredGridVolumeRayCastIterator&) = delete;
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};
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#endif // vtkUnstructuredGridRayCastIterator_h
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