Method Initialize

Common/DataModel/vtkCellLocatorStrategy.cxx:54–110

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//------------------------------------------------------------------------------
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)
    {
      // only the owner of the locator can change it
      if (this->OwnsLocator)
      {
        this->CellLocator->SetDataSet(ps);
        this->CellLocator->BuildLocator();
      }
    }
    else
    {
      ps->BuildCellLocator();
      psCL = ps->GetCellLocator();
      this->CellLocator = psCL;
      this->OwnsLocator = false;
    }
  }
  else
  {
    if (psCL != this->CellLocator)
    {
      this->CellLocator = psCL;
      this->OwnsLocator = false;
    }
    // ensure that the point-set's locator is up-to-date
    // this should be done only by one thread
    if (!this->IsACopy)
    {
      this->CellLocator->BuildLocator();
    }
  }

  this->InitializeTime.Modified();

  return 1;
}