class Magick::RVG::Utility::GraphicContext

def baseline_shift(value)
  @text_attrs.baseline_shift = case value
                               when 'baseline', 'sub', 'super'
                                 value.to_sym
                               when /[-+]?\d+%/, Numeric
                                 value
                               else
                                 :baseline
                               end
  nil
end