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94 lines
2.9 KiB
94 lines
2.9 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkParametricConicSpiral.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 "vtkParametricConicSpiral.h"
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#include "vtkObjectFactory.h"
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#include "vtkMath.h"
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vtkCxxRevisionMacro(vtkParametricConicSpiral, "$Revision: 1.3 $");
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vtkStandardNewMacro(vtkParametricConicSpiral);
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//----------------------------------------------------------------------------
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vtkParametricConicSpiral::vtkParametricConicSpiral()
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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;
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this->MaximumU = 2.0*vtkMath::Pi();
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this->MaximumV = 2.0*vtkMath::Pi();
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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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// Conic Spiral
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this->A = 0.2;
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this->B = 1;
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this->C = 0.1;
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this->N = 2;
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}
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//----------------------------------------------------------------------------
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vtkParametricConicSpiral::~vtkParametricConicSpiral()
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{
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}
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//----------------------------------------------------------------------------
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void vtkParametricConicSpiral::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 inv2pi = 1.0/(2.0*vtkMath::Pi());
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double cnv = cos(this->N*v);
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double snv = sin(this->N*v);
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double cu = cos(u);
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double su = sin(u);
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// The point
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Pt[0] = this->A*(1-v*inv2pi)*cnv*(1+cu)+this->C*cnv;
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Pt[1] = this->A*(1-v*inv2pi)*snv*(1+cu)+this->C*snv;
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Pt[2] = this->B*v*inv2pi+this->A*(1-v*inv2pi)*su;
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//The derivatives are:
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Du[0] = -this->A*(1-v*inv2pi)*cnv*su;
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Dv[0] = -this->A*inv2pi*cnv*(1+cu)-this->A*(1-v*inv2pi)*snv*this->N*(1+cu)-this->C*snv*N;
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Du[1] = -this->A*(1-v*inv2pi)*snv*su;
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Dv[1] = -this->A*inv2pi*snv*(1+cu)+this->A*(1-v*inv2pi)*cnv*this->N*(1+cu)+C*cnv*this->N;
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Du[2] = this->A*(1-v*inv2pi)*cu;
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Dv[2] = this->B*inv2pi-this->A*inv2pi*su;
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}
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//----------------------------------------------------------------------------
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double vtkParametricConicSpiral::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 vtkParametricConicSpiral::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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os << indent << "C: " << this->C << "\n";
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os << indent << "N: " << this->N << "\n";
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}
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