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82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkParametricPseudosphere.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 vtkParametricPseudosphere
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* @brief Generate a pseudosphere.
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*
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* vtkParametricPseudosphere generates a parametric pseudosphere. The
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* pseudosphere is generated as a surface of revolution of the tractrix about
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* it's asymptote, and is a surface of constant negative Gaussian curvature.
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* You can find out more about this interesting surface at
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* <a href="http://mathworld.wolfram.com/Pseudosphere.html">Math World</a>.
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* @par Thanks:
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* Tim Meehan
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*/
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#ifndef vtkParametricPseudosphere_h
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#define vtkParametricPseudosphere_h
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#include "vtkCommonComputationalGeometryModule.h" // For export macro
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#include "vtkParametricFunction.h"
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class VTKCOMMONCOMPUTATIONALGEOMETRY_EXPORT vtkParametricPseudosphere : public vtkParametricFunction
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{
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public:
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vtkTypeMacro(vtkParametricPseudosphere, vtkParametricFunction);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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/**
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* Construct a pseudosphere surface with the following parameters:
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* (MinimumU, MaximumU) = (-5., 5.),
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* (MinimumV, MaximumV) = (-pi, pi),
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* JoinU = 0, JoinV = 1,
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* TwistU = 0, TwistV = 0;
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* ClockwiseOrdering = 0,
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* DerivativesAvailable = 1,
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*/
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static vtkParametricPseudosphere* New();
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/**
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* Return the parametric dimension of the class.
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*/
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int GetDimension() override { return 2; }
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/**
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* Pseudosphere surface.
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* This function performs the mapping \f$f(u,v) \rightarrow (x,y,x)\f$, returning it
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* as Pt. It also returns the partial derivatives Du and Dv.
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* \f$Pt = (x, y, z), D_u\vec{f} = (dx/du, dy/du, dz/du), D_v\vec{f} = (dx/dv, dy/dv, dz/dv)\f$ .
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* Then the normal is \f$N = D_u\vec{f} \times D_v\vec{f}\f$ .
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*/
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void Evaluate(double uvw[3], double Pt[3], double Duvw[9]) override;
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/**
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* Calculate a user defined scalar using one or all of uvw, Pt, Duvw.
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* This method simply returns 0.
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*/
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double EvaluateScalar(double uvw[3], double Pt[3], double Duvw[9]) override;
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protected:
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vtkParametricPseudosphere();
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~vtkParametricPseudosphere() override;
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private:
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vtkParametricPseudosphere(const vtkParametricPseudosphere&) = delete;
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void operator=(const vtkParametricPseudosphere&) = delete;
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};
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#endif
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