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93 lines
2.5 KiB
93 lines
2.5 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkParametricDini.cxx,v $
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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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#include "vtkParametricDini.h"
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#include "vtkObjectFactory.h"
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#include "vtkMath.h"
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vtkCxxRevisionMacro(vtkParametricDini, "$Revision: 1.2 $");
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vtkStandardNewMacro(vtkParametricDini);
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//----------------------------------------------------------------------------
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vtkParametricDini::vtkParametricDini()
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{
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// Preset triangulation parameters
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this->MinimumU = 0;
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this->MinimumV = 0.001;
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this->MaximumU = 4*vtkMath::Pi();
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this->MaximumV = 2.0;
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this->JoinU = 0;
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this->JoinV = 0;
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this->TwistU = 0;
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this->TwistV = 0;
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this->ClockwiseOrdering = 1;
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this->DerivativesAvailable = 1;
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this->A = 1.0;
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this->B = 0.2;
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}
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//----------------------------------------------------------------------------
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vtkParametricDini::~vtkParametricDini()
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{
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}
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//----------------------------------------------------------------------------
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void vtkParametricDini::Evaluate(double uvw[3], double Pt[3], double Duvw[9])
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{
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double u = uvw[0];
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double v = uvw[1];
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double *Du = Duvw;
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double *Dv = Duvw + 3;
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double cu = cos(u);
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double cv = cos(v);
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double su = sin(u);
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double sv = sin(v);
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// The point
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Pt[0] = this->A*cu*sv;
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Pt[1] = this->A*su*sv;
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Pt[2] = this->A*(cos(v)+log(tan((v/2))))+this->B*u;
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//The derivatives are:
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Du[0] = -Pt[1];
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Dv[0] = this->A*cu*cv;
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Du[1] = Pt[0];
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Dv[1] = this->A*su*cv;
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Du[2] = this->B;
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double tv2 = tan(0.5*v);
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if ( tv2 != 0 )
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Dv[2] = this->A*(-sv+(0.5+0.5*tv2*tv2)/tv2);
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else
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Dv[2] = this->A*(-sv+(0.5+0.5*tv2*tv2)/0.0001); // Avoid division by zero.
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}
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//----------------------------------------------------------------------------
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double vtkParametricDini::EvaluateScalar(double *, double *, double *)
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{
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return 0;
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}
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//----------------------------------------------------------------------------
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void vtkParametricDini::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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os << indent << "A: " << this->A << "\n";
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os << indent << "B: " << this->B << "\n";
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}
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