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/*=========================================================================
Program: Visualization Toolkit
Module: vtkSphere.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 vtkSphere - implicit function for a sphere
// .SECTION Description
// vtkSphere computes the implicit function and/or gradient for a sphere.
// vtkSphere is a concrete implementation of vtkImplicitFunction. Additional
// methods are available for sphere-related computations, such as computing
// bounding spheres for a set of points, or set of spheres.
#ifndef __vtkSphere_h
#define __vtkSphere_h
#include "vtkImplicitFunction.h"
class VTK_FILTERING_EXPORT vtkSphere : public vtkImplicitFunction
{
public:
vtkTypeMacro(vtkSphere,vtkImplicitFunction);
void PrintSelf(ostream& os, vtkIndent indent);
// Description
// Construct sphere with center at (0,0,0) and radius=0.5.
static vtkSphere *New();
// Description
// Evaluate sphere equation ((x-x0)^2 + (y-y0)^2 + (z-z0)^2) - R^2.
double EvaluateFunction(double x[3]);
double EvaluateFunction(double x, double y, double z)
{return this->vtkImplicitFunction::EvaluateFunction(x, y, z); } ;
// Description
// Evaluate sphere gradient.
void EvaluateGradient(double x[3], double n[3]);
// Description:
// Set / get the radius of the sphere. The default is 0.5.
vtkSetMacro(Radius,double);
vtkGetMacro(Radius,double);
// Description:
// Set / get the center of the sphere. The default is (0,0,0).
vtkSetVector3Macro(Center,double);
vtkGetVectorMacro(Center,double,3);
// Description:
// Create a bounding sphere from a set of points. The set of points is
// defined by an array of doubles, in the order of x-y-z (which repeats for
// each point). An optional hints array provides a guess for the initial
// bounding sphere; the two values in the hints array are the two points
// expected to be the furthest apart. The output sphere consists of a
// center (x-y-z) and a radius.
static void ComputeBoundingSphere(float *pts, vtkIdType numPts, float sphere[4],
vtkIdType hints[2]);
static void ComputeBoundingSphere(double *pts, vtkIdType numPts, double sphere[4],
vtkIdType hints[2]);
// Description:
// Create a bounding sphere from a set of spheres. The set of input spheres
// is defined by an array of pointers to spheres. Each sphere is defined by
// the 4-tuple: center(x-y-z)+radius. An optional hints array provides a
// guess for the initial bounding sphere; the two values in the hints array
// are the two spheres expected to be the furthest apart. The output sphere
// consists of a center (x-y-z) and a radius.
static void ComputeBoundingSphere(float **spheres, vtkIdType numSpheres, float sphere[4],
vtkIdType hints[2]);
static void ComputeBoundingSphere(double **spheres, vtkIdType numSpheres, double sphere[4],
vtkIdType hints[2]);
protected:
vtkSphere();
~vtkSphere() {};
double Radius;
double Center[3];
private:
vtkSphere(const vtkSphere&); // Not implemented.
void operator=(const vtkSphere&); // Not implemented.
};
#endif
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