docs/modules/extend/examples/pdf-converter-centered-part-title.rb


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class PDFConverterCenteredPartTitle < (Asciidoctor::Converter.for 'pdf')
  register_for 'pdf'

  def ink_part_title node, title, opts = {}
    vertical_padding = (padding = expand_padding_value theme.heading_h1_padding)[0] + padding[2]
    title_height = height_of_typeset_text title, inline_format: true, text_transform: @text_transform
    space_above = (effective_page_height - (title_height + vertical_padding)) * 0.5
    move_down space_above
    opts = opts.merge align: :center
    page.imported
    super
  end
end