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