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93 lines
3.4 KiB
93 lines
3.4 KiB
// -*- c++ -*-
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/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkUnstructuredGridVolumeRayCastIterator.h,v $
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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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// .NAME vtkUnstructuredGridVolumeRayCastIterator
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//
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// .SECTION Description
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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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// .SECTION See Also
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// vtkUnstructuredGridVolumeRayCastFunction
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//
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#ifndef __vtkUnstructuredGridRayCastIterator_h
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#define __vtkUnstructuredGridRayCastIterator_h
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#include "vtkObject.h"
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class vtkIdList;
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class vtkDoubleArray;
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class vtkDataArray;
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class VTK_VOLUMERENDERING_EXPORT vtkUnstructuredGridVolumeRayCastIterator : public vtkObject
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{
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public:
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vtkTypeRevisionMacro(vtkUnstructuredGridVolumeRayCastIterator, vtkObject);
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virtual void PrintSelf(ostream &os, vtkIndent indent);
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// Description:
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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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virtual void Initialize(int x, int y) = 0;
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// Description:
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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 supress 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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virtual vtkIdType GetNextIntersections(vtkIdList *intersectedCells,
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vtkDoubleArray *intersectionLengths,
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vtkDataArray *scalars,
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vtkDataArray *nearIntersections,
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vtkDataArray *farIntersections) = 0;
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// Description:
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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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vtkSetVector2Macro(Bounds, double);
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vtkGetVector2Macro(Bounds, double);
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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();
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double Bounds[2];
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vtkIdType MaxNumberOfIntersections;
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private:
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vtkUnstructuredGridVolumeRayCastIterator(const vtkUnstructuredGridVolumeRayCastIterator&); // Not implemented.
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void operator=(const vtkUnstructuredGridVolumeRayCastIterator&); // Not implemented.
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};
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#endif //__vtkUnstructuredGridRayCastIterator_h
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