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88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkSphericalDirectionEncoder.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 vtkSphericalDirectionEncoder
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* @brief A direction encoder based on spherical coordinates
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*
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* vtkSphericalDirectionEncoder is a direction encoder which uses spherical
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* coordinates for mapping (nx, ny, nz) into an azimuth, elevation pair.
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*
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* @sa
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* vtkDirectionEncoder
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*/
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#ifndef vtkSphericalDirectionEncoder_h
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#define vtkSphericalDirectionEncoder_h
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#include "vtkDirectionEncoder.h"
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#include "vtkRenderingVolumeModule.h" // For export macro
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class VTKRENDERINGVOLUME_EXPORT vtkSphericalDirectionEncoder : public vtkDirectionEncoder
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{
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public:
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vtkTypeMacro(vtkSphericalDirectionEncoder, vtkDirectionEncoder);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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/**
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* Construct the object. Initialize the index table which will be
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* used to map the normal into a patch on the recursively subdivided
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* sphere.
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*/
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static vtkSphericalDirectionEncoder* New();
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/**
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* Given a normal vector n, return the encoded direction
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*/
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int GetEncodedDirection(float n[3]) override;
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/**
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* / Given an encoded value, return a pointer to the normal vector
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*/
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float* GetDecodedGradient(int value) VTK_SIZEHINT(3) override;
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/**
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* Return the number of encoded directions
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*/
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int GetNumberOfEncodedDirections(void) override { return 65536; }
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/**
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* Get the decoded gradient table. There are
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* this->GetNumberOfEncodedDirections() entries in the table, each
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* containing a normal (direction) vector. This is a flat structure -
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* 3 times the number of directions floats in an array.
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*/
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float* GetDecodedGradientTable(void) override { return &(this->DecodedGradientTable[0]); }
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protected:
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vtkSphericalDirectionEncoder();
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~vtkSphericalDirectionEncoder() override;
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static float DecodedGradientTable[65536 * 3];
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//@{
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/**
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* Initialize the table at startup
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*/
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static void InitializeDecodedGradientTable();
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static int DecodedGradientTableInitialized;
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//@}
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private:
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vtkSphericalDirectionEncoder(const vtkSphericalDirectionEncoder&) = delete;
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void operator=(const vtkSphericalDirectionEncoder&) = delete;
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};
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#endif
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