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123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkSphere.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 vtkSphere
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* @brief implicit function for a sphere
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*
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* vtkSphere computes the implicit function and/or gradient for a sphere.
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* vtkSphere is a concrete implementation of vtkImplicitFunction. Additional
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* methods are available for sphere-related computations, such as computing
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* bounding spheres for a set of points, or set of spheres.
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*/
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#ifndef vtkSphere_h
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#define vtkSphere_h
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#include "vtkCommonDataModelModule.h" // For export macro
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#include "vtkImplicitFunction.h"
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class VTKCOMMONDATAMODEL_EXPORT vtkSphere : public vtkImplicitFunction
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{
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public:
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vtkTypeMacro(vtkSphere, vtkImplicitFunction);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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/**
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* Construct sphere with center at (0,0,0) and radius=0.5.
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*/
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static vtkSphere* New();
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//@{
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/**
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* Evaluate sphere equation ((x-x0)^2 + (y-y0)^2 + (z-z0)^2) - R^2.
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*/
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using vtkImplicitFunction::EvaluateFunction;
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double EvaluateFunction(double x[3]) override;
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//@}
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/**
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* Evaluate sphere gradient.
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*/
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void EvaluateGradient(double x[3], double n[3]) override;
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//@{
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/**
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* Set / get the radius of the sphere. The default is 0.5.
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*/
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vtkSetMacro(Radius, double);
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vtkGetMacro(Radius, double);
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//@}
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//@{
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/**
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* Set / get the center of the sphere. The default is (0,0,0).
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*/
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vtkSetVector3Macro(Center, double);
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vtkGetVectorMacro(Center, double, 3);
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//@}
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/**
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* Quick evaluation of the sphere equation ((x-x0)^2 + (y-y0)^2 + (z-z0)^2) - R^2.
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*/
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static double Evaluate(double center[3], double R, double x[3])
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{
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return (x[0] - center[0]) * (x[0] - center[0]) + (x[1] - center[1]) * (x[1] - center[1]) +
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(x[2] - center[2]) * (x[2] - center[2]) - R * R;
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}
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//@{
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/**
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* Create a bounding sphere from a set of points. The set of points is
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* defined by an array of doubles, in the order of x-y-z (which repeats for
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* each point). An optional hints array provides a guess for the initial
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* bounding sphere; the two values in the hints array are the two points
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* expected to be the furthest apart. The output sphere consists of a
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* center (x-y-z) and a radius.
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*/
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static void ComputeBoundingSphere(
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float* pts, vtkIdType numPts, float sphere[4], vtkIdType hints[2]);
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static void ComputeBoundingSphere(
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double* pts, vtkIdType numPts, double sphere[4], vtkIdType hints[2]);
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//@}
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//@{
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/**
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* Create a bounding sphere from a set of spheres. The set of input spheres
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* is defined by an array of pointers to spheres. Each sphere is defined by
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* the 4-tuple: center(x-y-z)+radius. An optional hints array provides a
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* guess for the initial bounding sphere; the two values in the hints array
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* are the two spheres expected to be the furthest apart. The output sphere
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* consists of a center (x-y-z) and a radius.
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*/
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static void ComputeBoundingSphere(
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float** spheres, vtkIdType numSpheres, float sphere[4], vtkIdType hints[2]);
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static void ComputeBoundingSphere(
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double** spheres, vtkIdType numSpheres, double sphere[4], vtkIdType hints[2]);
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//@}
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protected:
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vtkSphere();
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~vtkSphere() override {}
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double Radius;
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double Center[3];
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private:
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vtkSphere(const vtkSphere&) = delete;
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void operator=(const vtkSphere&) = delete;
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};
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#endif
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