Method UpdateRectangle

Rendering/Core/vtkTextActor.cxx:848–886

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

//------------------------------------------------------------------------------
int vtkTextActor::UpdateRectangle(vtkViewport* viewport)
{
  if (this->TextProperty->GetMTime() > this->ScaledTextProperty->GetMTime() ||
    this->GetMTime() > this->BuildTime)
  {
    this->ComputeScaledFont(viewport);
  }

  vtkWindow* win = viewport->GetVTKWindow();
  if (!win)
  {
    vtkErrorMacro(<< "No render window available: cannot determine DPI.");
    return 0;
  }

  // check if we need to render the string
  if (this->ScaledTextProperty->GetMTime() > this->BuildTime || !this->InputRendered ||
    this->GetMTime() > this->BuildTime || this->RenderedDPI != win->GetDPI())
  {
    if (!this->RenderImage(this->ScaledTextProperty, viewport))
    {
      vtkErrorMacro(<< "Failed rendering text to buffer");
      return 0;
    }

    // Check if we need to create a new rectangle.
    // Need to check if angle has changed.
    // justification and line offset are handled in ComputeRectangle
    this->ComputeRectangle(viewport);

    this->ImageData->Modified();
    this->Texture->SetInputData(this->ImageData);
    this->Texture->Modified();
    this->InputRendered = true;
    this->RenderedDPI = win->GetDPI();
    this->BuildTime.Modified();
  }
  return 1;
}

//------------------------------------------------------------------------------
void vtkTextActor::SpecifiedToDisplay(double* pos, vtkViewport* vport, int specified)