Method BuildTitle2D

Rendering/Annotation/vtkAxisActor.cxx:895–924

------------------------------------------------------------------------------ Determines scale and position for the 2D Title. Currently, title can only be centered with respect to its axis. ------------------------------------------------------------------------------

//  title can only be centered with respect to its axis.
//------------------------------------------------------------------------------
void vtkAxisActor::BuildTitle2D(vtkViewport* viewport, bool force)
{
  if (!this->NeedBuild2D && !force && !this->TitleVisibility)
  {
    return;
  }

  this->UpdateTitleActorProperty();

  double scenePos[3];
  this->TitleProp->GetReferencePosition(scenePos);

  double position[2];
  this->Get2DPosition(viewport, 1., scenePos, position);

  if (this->SaveTitlePosition > 0)
  {
    if (this->SaveTitlePosition == 1)
    {
      this->TitleConstantPosition[0] = position[0];
      this->TitleConstantPosition[1] = position[1];
      this->SaveTitlePosition = 2;
    }
    position[0] = this->TitleConstantPosition[0];
    position[1] = this->TitleConstantPosition[1];
  }

  this->TitleProp->SetDisplayPosition(position[0], position[1]);
  this->TitleProp->RotateActor2DFromAxisProjection(this->GetPoint1(), this->GetPoint2());
}

//------------------------------------------------------------------------------
void vtkAxisActor::Get2DPosition(