Method SetTitleFontSize

Rendering/Annotation/vtkAxisActor2D.cxx:915–962

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//------------------------------------------------------------------------------
void vtkAxisActor2D::SetTitleFontSize(vtkViewport* viewport, int stringSize[2])
{
  // the mapper returns the global bounding box. Artificially set orientation to 0
  // in this scope to get the local bounding box in `stringSize`
  double originalAngle = this->TitleMapper->GetTextProperty()->GetOrientation();
  this->TitleMapper->GetTextProperty()->SetOrientation(0);

  if (this->PositionsChangedOrViewportResized(viewport) ||
    this->TitleTextProperty->GetMTime() > this->BuildTime)
  {
    if (!this->UseFontSizeFromProperty)
    {
      if (!this->SizeFontRelativeToAxis)
      {
        int* size = viewport->GetSize();
        vtkTextMapper::SetRelativeFontSize(
          this->TitleMapper, viewport, size, stringSize, 0.015 * this->FontFactor);
      }
      else
      {

        double *xp1, *xp2, len = 0.0;
        if (this->SizeFontRelativeToAxis)
        {
          xp1 = this->PositionCoordinate->GetComputedDoubleViewportValue(viewport);
          xp2 = this->Position2Coordinate->GetComputedDoubleViewportValue(viewport);
          len = std::sqrt(
            (xp2[0] - xp1[0]) * (xp2[0] - xp1[0]) + (xp2[1] - xp1[1]) * (xp2[1] - xp1[1]));
        }

        this->TitleMapper->SetConstrainedFontSize(
          viewport, static_cast<int>(0.33 * len), static_cast<int>(0.2 * len));
        this->TitleMapper->GetSize(viewport, stringSize);
      }
    }
    else
    {
      this->TitleMapper->GetSize(viewport, stringSize);
    }
  }
  else
  {
    this->TitleMapper->GetSize(viewport, stringSize);
  }

  // Restore the orientation.
  this->TitleMapper->GetTextProperty()->SetOrientation(originalAngle);
}

//------------------------------------------------------------------------------
void vtkAxisActor2D::BuildTitle(vtkViewport* viewport)