class Magick::RVG::Utility::TextStrategy

def shift_baseline(glyph_orientation, glyph)
  glyph_dimensions = @ctx.shadow.get_type_metrics(glyph)
  if glyph_orientation == 0 || glyph_orientation == 180
    x = glyph_dimensions.width
  else
    x = glyph_dimensions.ascent - glyph_dimensions.descent
  end
  case @ctx.text_attrs.baseline_shift
    when :baseline
      x = 0
    when :sub
    when :super
      x = -x
    when /[-+]?(\d+)%/
      m = $1 == '-' ? -1.0 : 1.0
      x = (m * x * $1.to_f / 100.0)
    else
      x = -@ctx.text_attrs.baseline_shift
  end
  x
end