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99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkQuadric.cxx
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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 "vtkQuadric.h"
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#include "vtkObjectFactory.h"
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vtkStandardNewMacro(vtkQuadric);
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// Construct quadric with all coefficients = 1.
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vtkQuadric::vtkQuadric()
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{
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for ( int i = 0; i < 10; i++ )
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{
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this->Coefficients[i] = 1.0;
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}
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}
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// Set the 10 coefficients of the quadric equation.
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void vtkQuadric::SetCoefficients(double a[10])
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{
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bool changed = false;
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// Check if at least one coefficient really changed
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for ( int i = 0; i < 10; i++ )
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{
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if ( a[i] != this->Coefficients[i] )
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{
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changed = true;
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break;
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}
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}
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if ( changed )
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{
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memcpy(this->Coefficients, a, 10 * sizeof(double));
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this->Modified();
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}
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}
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// Set the 10 coefficients of the quadric equation.
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void vtkQuadric::SetCoefficients(double a0, double a1, double a2, double a3, double a4,
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double a5, double a6, double a7, double a8, double a9)
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{
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double a[10];
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a[0] = a0; a[1] = a1; a[2] = a2; a[3] = a3; a[4] = a4;
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a[5] = a5; a[6] = a6; a[7] = a7; a[8] = a8; a[9] = a9;
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vtkQuadric::SetCoefficients(a);
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}
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// Evaluate quadric equation.
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double vtkQuadric::EvaluateFunction(double x[3])
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{
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double *a = this->Coefficients;
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return ( a[0]*x[0]*x[0] + a[1]*x[1]*x[1] + a[2]*x[2]*x[2] +
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a[3]*x[0]*x[1] + a[4]*x[1]*x[2] + a[5]*x[0]*x[2] +
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a[6]*x[0] + a[7]*x[1] + a[8]*x[2] + a[9] );
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}
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// Evaluate the gradient to the quadric equation.
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void vtkQuadric::EvaluateGradient(double x[3], double n[3])
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{
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double *a = this->Coefficients;
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n[0] = 2.0*a[0]*x[0] + a[3]*x[1] + a[5]*x[2] + a[6];
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n[1] = 2.0*a[1]*x[1] + a[3]*x[0] + a[4]*x[2] + a[7];
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n[2] = 2.0*a[2]*x[2] + a[4]*x[1] + a[5]*x[0] + a[8];
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}
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void vtkQuadric::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os, indent);
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os << indent << "Coefficients: "
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<< "\n\ta0: " << this->Coefficients[0]
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<< "\n\ta1: " << this->Coefficients[1]
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<< "\n\ta2: " << this->Coefficients[2]
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<< "\n\ta3: " << this->Coefficients[3]
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<< "\n\ta4: " << this->Coefficients[4]
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<< "\n\ta5: " << this->Coefficients[5]
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<< "\n\ta6: " << this->Coefficients[6]
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<< "\n\ta7: " << this->Coefficients[7]
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<< "\n\ta8: " << this->Coefficients[8]
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<< "\n\ta9: " << this->Coefficients[9] << "\n";
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}
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