Method ComputeFontSizeForBoundedString

Rendering/Context2D/vtkContext2D.cxx:700–741

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//------------------------------------------------------------------------------
int vtkContext2D::ComputeFontSizeForBoundedString(
  const vtkStdString& string, float width, float height)
{
  double orientation = this->GetTextProp()->GetOrientation();
  this->GetTextProp()->SetOrientation(0.0);

  float stringBounds[4];
  int currentFontSize = this->GetTextProp()->GetFontSize();
  this->ComputeStringBounds(string, stringBounds);

  // font size is too big
  if (stringBounds[2] > width || stringBounds[3] > height)
  {
    while (stringBounds[2] > width || stringBounds[3] > height)
    {
      --currentFontSize;
      this->GetTextProp()->SetFontSize(currentFontSize);
      this->ComputeStringBounds(string, stringBounds);
      if (currentFontSize < 0)
      {
        this->GetTextProp()->SetFontSize(0);
        return 0;
      }
    }
  }

  // font size is too small
  else
  {
    while (stringBounds[2] < width && stringBounds[3] < height)
    {
      ++currentFontSize;
      this->GetTextProp()->SetFontSize(currentFontSize);
      this->ComputeStringBounds(string, stringBounds);
    }
    --currentFontSize;
    this->GetTextProp()->SetFontSize(currentFontSize);
  }

  this->GetTextProp()->SetOrientation(orientation);
  return currentFontSize;
}

//------------------------------------------------------------------------------
void vtkContext2D::DrawMathTextString(vtkPoints2D* point, const vtkStdString& string)