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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImplicitHalo.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.
=========================================================================*/
// .NAME vtkImplicitHalo - implicit function for an halo
// .SECTION Description
// vtkImplicitHalo evaluates to 1.0 for each position in the sphere of a
// given center and radius Radius*(1-FadeOut). It evaluates to 0.0 for each
// position out the sphere of a given Center and radius Radius. It fades out
// linearly from 1.0 to 0.0 for points in a radius from Radius*(1-FadeOut) to
// Radius.
// vtkImplicitHalo is a concrete implementation of vtkImplicitFunction.
// It is useful as an input to
// vtkSampleFunction to generate an 2D image of an halo. It is used this way by
// vtkShadowMapPass.
// .SECTION Caveats
// It does not implement the gradient.
#ifndef vtkImplicitHalo_h
#define vtkImplicitHalo_h
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkImplicitFunction.h"
class VTKCOMMONDATAMODEL_EXPORT vtkImplicitHalo : public vtkImplicitFunction
{
public:
// Description
// Center=(0.0,0.0,0.0), Radius=1.0, FadeOut=0.01
static vtkImplicitHalo *New();
vtkTypeMacro(vtkImplicitHalo,vtkImplicitFunction);
void PrintSelf(ostream& os, vtkIndent indent);
// Description
// Evaluate the equation.
virtual double EvaluateFunction(double x[3]);
virtual double EvaluateFunction(double x, double y, double z)
{
return this->vtkImplicitFunction::EvaluateFunction(x, y, z);
}
// Description
// Evaluate normal. Not implemented.
void EvaluateGradient(double x[3], double g[3]);
// Description:
// Radius of the sphere.
vtkSetMacro(Radius,double);
vtkGetMacro(Radius,double);
// Description:
// Center of the sphere.
vtkSetVector3Macro(Center,double);
vtkGetVector3Macro(Center,double);
// Description:
// FadeOut ratio. Valid values are between 0.0 and 1.0.
vtkSetMacro(FadeOut,double);
vtkGetMacro(FadeOut,double);
protected:
vtkImplicitHalo();
virtual ~vtkImplicitHalo();
double Radius;
double Center[3];
double FadeOut;
private:
vtkImplicitHalo(const vtkImplicitHalo&); // Not implemented.
void operator=(const vtkImplicitHalo&); // Not implemented.
};
#endif
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