Method RebuildLayoutIfNeeded

Rendering/Annotation/vtkScalarBarActor.cxx:473–537

}

int vtkScalarBarActor::RebuildLayoutIfNeeded(vtkViewport* viewport)
{
  if (!this->LookupTable)
  {
    vtkWarningMacro(<< "Need a lookup table to render a scalar bar");
    return 0;
  }

  if (!this->TitleTextProperty)
  {
    vtkErrorMacro(<< "Need title text property to render a scalar bar");
    return 0;
  }

  if (!this->LabelTextProperty)
  {
    vtkErrorMacro(<< "Need label text property to render a scalar bar");
    return 0;
  }

  if (!this->AnnotationTextProperty)
  {
    vtkErrorMacro(<< "Need annotation text property to render a scalar bar");
    return 0;
  }

  // Check to see whether we have to rebuild everything
  int positionsHaveChanged = 0;
  if (viewport->GetMTime() > this->BuildTime ||
    (viewport->GetVTKWindow() && viewport->GetVTKWindow()->GetMTime() > this->BuildTime))
  {
    // if the viewport has changed we may - or may not need
    // to rebuild, it depends on if the projected coords change
    int size[2];
    int* barOrigin;
    barOrigin = this->PositionCoordinate->GetComputedViewportValue(viewport);
    size[0] = this->Position2Coordinate->GetComputedViewportValue(viewport)[0] - barOrigin[0];
    size[1] = this->Position2Coordinate->GetComputedViewportValue(viewport)[1] - barOrigin[1];

    // Check if we have bounds on the maximum size
    size[0] = size[0] > this->MaximumWidthInPixels ? this->MaximumWidthInPixels : size[0];
    size[1] = size[1] > this->MaximumHeightInPixels ? this->MaximumHeightInPixels : size[1];

    if (this->LastSize[0] != size[0] || this->LastSize[1] != size[1] ||
      this->LastOrigin[0] != barOrigin[0] || this->LastOrigin[1] != barOrigin[1])
    {
      positionsHaveChanged = 1;
    }
  }

  // Check to see whether we have to rebuild everything
  if (positionsHaveChanged || this->GetMTime() > this->BuildTime ||
    this->LookupTable->GetMTime() > this->BuildTime ||
    this->AnnotationTextProperty->GetMTime() > this->BuildTime ||
    this->LabelTextProperty->GetMTime() > this->BuildTime ||
    this->TitleTextProperty->GetMTime() > this->BuildTime ||
    this->BackgroundProperty->GetMTime() > this->BuildTime ||
    this->FrameProperty->GetMTime() > this->BuildTime ||