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/*=========================================================================
Program: Visualization Toolkit
Module: vtkCellLocatorStrategy.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 "vtkCellLocatorStrategy.h"
#include "vtkAbstractCellLocator.h"
#include "vtkCell.h"
#include "vtkGenericCell.h"
#include "vtkObjectFactory.h"
#include "vtkPointSet.h"
//----------------------------------------------------------------------------
vtkStandardNewMacro(vtkCellLocatorStrategy);
//----------------------------------------------------------------------------
vtkCellLocatorStrategy::vtkCellLocatorStrategy()
{
// You may ask, why this OwnsLocator rigamarole. The reason is because the
// reference counting garbage collecter gets confused when the locator,
// point set, and strategy are all mixed together; resulting in memory
// leaks etc.
this->OwnsLocator = false;
this->CellLocator = nullptr;
}
//----------------------------------------------------------------------------
vtkCellLocatorStrategy::~vtkCellLocatorStrategy()
{
if (this->OwnsLocator && this->CellLocator != nullptr)
{
this->CellLocator->Delete();
this->CellLocator = nullptr;
}
}
//-----------------------------------------------------------------------------
void vtkCellLocatorStrategy::SetCellLocator(vtkAbstractCellLocator* cL)
{
if (cL != this->CellLocator)
{
if (this->CellLocator != nullptr && this->OwnsLocator)
{
this->CellLocator->Delete();
}
this->CellLocator = cL;
if (cL != nullptr)
{
cL->Register(this);
}
this->OwnsLocator = true;
this->Modified();
}
}
//-----------------------------------------------------------------------------
int vtkCellLocatorStrategy::Initialize(vtkPointSet* ps)
{
// See whether anything has changed. If not, just return.
if (this->PointSet != nullptr && ps == this->PointSet && this->MTime < this->InitializeTime)
{
return 1;
}
// Set up the point set; return on failure.
if (this->Superclass::Initialize(ps) == 0)
{
return 0;
}
// Use the point set's cell locator preferentially. If no cell locator,
// then we need to create one. If one is specified here in the strategy,
// use that. If not, then used the point set's default build cell locator
// method.
vtkAbstractCellLocator* psCL = ps->GetCellLocator();
if (psCL == nullptr)
{
if (this->CellLocator != nullptr && this->OwnsLocator)
{
this->CellLocator->SetDataSet(ps);
this->CellLocator->BuildLocator();
}
else
{
ps->BuildCellLocator();
psCL = ps->GetCellLocator();
this->CellLocator = psCL;
this->OwnsLocator = false;
}
}
else
{
this->CellLocator = psCL;
this->OwnsLocator = false;
}
this->InitializeTime.Modified();
return 1;
}
//-----------------------------------------------------------------------------
vtkIdType vtkCellLocatorStrategy::FindCell(double x[3], vtkCell* cell, vtkGenericCell* gencell,
vtkIdType cellId, double tol2, int& subId, double pcoords[3], double* weights)
{
// If we are given a starting cell, try that.
if (cell && (cellId >= 0))
{
double closestPoint[3];
double dist2;
if ((cell->EvaluatePosition(x, closestPoint, subId, pcoords, dist2, weights) == 1) &&
(dist2 <= tol2))
{
return cellId;
}
}
// Okay cache miss, try the cell locator
subId = 0; // The cell locator FindCell API should return subId.
return this->CellLocator->FindCell(x, tol2, gencell, pcoords, weights);
}
//----------------------------------------------------------------------------
void vtkCellLocatorStrategy::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "CellLocator: " << this->CellLocator << "\n";
}
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