Method BuildPlot

Rendering/Annotation/vtkPieChartActor.cxx:295–358

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

//------------------------------------------------------------------------------
int vtkPieChartActor::BuildPlot(vtkViewport* viewport)
{
  // Initialize
  vtkDebugMacro(<< "Building pie chart plot");

  // Make sure input is up to date, and that the data is the correct shape to
  // plot.
  if (!this->GetInput())
  {
    vtkErrorMacro(<< "Nothing to plot!");
    return 0;
  }

  if (!this->TitleTextProperty)
  {
    vtkErrorMacro(<< "Need title text property to render plot");
    return 0;
  }
  if (!this->LabelTextProperty)
  {
    vtkErrorMacro(<< "Need label text property to render plot");
    return 0;
  }

  // Viewport change may not require rebuild
  int positionsHaveChanged = 0;
  if (viewport->GetMTime() > this->BuildTime ||
    (viewport->GetVTKWindow() && viewport->GetVTKWindow()->GetMTime() > this->BuildTime))
  {
    int* lastPosition = this->PositionCoordinate->GetComputedViewportValue(viewport);
    int* lastPosition2 = this->Position2Coordinate->GetComputedViewportValue(viewport);
    if (lastPosition[0] != this->LastPosition[0] || lastPosition[1] != this->LastPosition[1] ||
      lastPosition2[0] != this->LastPosition2[0] || lastPosition2[1] != this->LastPosition2[1])
    {
      this->LastPosition[0] = lastPosition[0];
      this->LastPosition[1] = lastPosition[1];
      this->LastPosition2[0] = lastPosition2[0];
      this->LastPosition2[1] = lastPosition2[1];
      positionsHaveChanged = 1;
    }
  }

  // Check modified time to see whether we have to rebuild.
  this->ConnectionHolder->GetInputAlgorithm()->Update();

  if (positionsHaveChanged || this->GetMTime() > this->BuildTime ||
    this->GetInput()->GetMTime() > this->BuildTime ||
    this->LabelTextProperty->GetMTime() > this->BuildTime ||
    this->TitleTextProperty->GetMTime() > this->BuildTime)
  {
    vtkDebugMacro(<< "Rebuilding plot");

    // Build axes
    const int* size = viewport->GetSize();
    if (!this->PlaceAxes(viewport, size))
    {
      return 0;
    }