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/*=========================================================================
Program: Visualization Toolkit
Module: vtkLagrangeCurve.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkLagrangeCurve.h"
#include "vtkCellData.h"
#include "vtkDoubleArray.h"
#include "vtkIdList.h"
#include "vtkLagrangeInterpolation.h"
#include "vtkLine.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkTriangle.h"
#include "vtkVector.h"
#include "vtkVectorOperators.h"
vtkStandardNewMacro(vtkLagrangeCurve);
vtkLagrangeCurve::vtkLagrangeCurve()
: vtkHigherOrderCurve()
{
}
vtkLagrangeCurve::~vtkLagrangeCurve() = default;
void vtkLagrangeCurve::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
/**\brief Populate the linear segment returned by GetApprox() with point-data from one voxel-like
* intervals of this cell.
*
* Ensure that you have called GetOrder() before calling this method
* so that this->Order is up to date. This method does no checking
* before using it to map connectivity-array offsets.
*/
vtkLine* vtkLagrangeCurve::GetApproximateLine(
int subId, vtkDataArray* scalarsIn, vtkDataArray* scalarsOut)
{
vtkLine* approx = this->GetApprox();
bool doScalars = (scalarsIn && scalarsOut);
if (doScalars)
{
scalarsOut->SetNumberOfTuples(2);
}
int i;
if (!this->SubCellCoordinatesFromId(i, subId))
{
vtkErrorMacro("Invalid subId " << subId);
return nullptr;
}
// Get the point ids (and optionally scalars) for each of the 2 corners
// in the approximating line spanned by (i, i+1):
for (vtkIdType ic = 0; ic < 2; ++ic)
{
const vtkIdType corner = this->PointIndexFromIJK(i + ic, 0, 0);
vtkVector3d cp;
this->Points->GetPoint(corner, cp.GetData());
approx->Points->SetPoint(ic, cp.GetData());
approx->PointIds->SetId(ic, doScalars ? corner : this->PointIds->GetId(corner));
if (doScalars)
{
scalarsOut->SetTuple(ic, scalarsIn->GetTuple(corner));
}
}
return approx;
}
void vtkLagrangeCurve::InterpolateFunctions(const double pcoords[3], double* weights)
{
vtkLagrangeInterpolation::Tensor1ShapeFunctions(this->GetOrder(), pcoords, weights);
}
void vtkLagrangeCurve::InterpolateDerivs(const double pcoords[3], double* derivs)
{
vtkLagrangeInterpolation::Tensor1ShapeDerivatives(this->GetOrder(), pcoords, derivs);
}
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