Method UpdateCache

Charts/Core/vtkPlotFunctionalBag.cxx:66–142

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
bool vtkPlotFunctionalBag::UpdateCache()
{
  if (!this->Superclass::UpdateCache())
  {
    return false;
  }

  vtkTable* table = this->Data->GetInput();
  if (!this->LookupTable)
  {
    this->CreateDefaultLookupTable();
    this->LookupTable->SetRange(0, table->GetNumberOfColumns());
    this->LookupTable->Build();
  }

  this->BagPoints->Reset();

  vtkDataArray* array[2] = { nullptr, nullptr };
  if (!this->GetDataArrays(table, array))
  {
    this->BuildTime.Modified();
    return false;
  }

  if (array[1]->GetNumberOfComponents() == 1)
  {
    // The input array has one component, manage it as a line
    this->Line->SetInputData(table, array[0] ? array[0]->GetName() : "", array[1]->GetName());
    this->Line->SetUseIndexForXSeries(this->UseIndexForXSeries);
    this->Line->SetMarkerStyle(vtkPlotPoints::NONE);
    this->Line->SetPen(this->Pen);
    this->Line->SetBrush(this->Brush);
    this->Line->Update();
  }
  else if (array[1]->GetNumberOfComponents() == 2)
  {
    // The input array has 2 components, this must be a bag
    // with {miny,maxy} tuples
    vtkDoubleArray* darr = vtkArrayDownCast<vtkDoubleArray>(array[1]);

    this->LogX = this->XAxis->GetLogScaleActive();
    this->LogY = this->YAxis->GetLogScaleActive();
    bool xAbs = this->XAxis->GetUnscaledMinimum() < 0.;
    bool yAbs = this->YAxis->GetUnscaledMinimum() < 0.;
    if (darr)
    {
      vtkIdType nbRows = array[1]->GetNumberOfTuples();
      this->BagPoints->SetNumberOfPoints(2 * nbRows);
      for (vtkIdType i = 0; i < nbRows; i++)
      {
        double y[2];
        darr->GetTuple(i, y);

        double x = (!this->UseIndexForXSeries && array[0]) ? array[0]->GetVariantValue(i).ToDouble()
                                                           : static_cast<double>(i);
        if (this->LogX)
        {
          x = xAbs ? log10(fabs(x)) : log10(x);