Module: Asciidoctor::PDF::FormattedText::InlineImageRenderer

Includes:
Logging
Defined in:
lib/asciidoctor/pdf/formatted_text/inline_image_renderer.rb

Class Method Summary collapse

Class Method Details

.render_behind(fragment) ⇒ Object

Embeds the image object in this fragment into the document in place of the text that was previously used to reserve space for the image in the line.

If the image height is less than 1.5x the height of the surrounding text, it is centered vertically in the line. If the image height is greater, then the image is aligned to the bottom of the text.

Note that render_behind is called before the text is printed.

This handler is only used on the main document (not the scratch document).



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# File 'lib/asciidoctor/pdf/formatted_text/inline_image_renderer.rb', line 20

def render_behind fragment
  pdf = fragment.document
  data = fragment.format_state
  if data.key? :line_height_increased
    # align image to bottom of line (differs from fragment.top by descender value)
    image_top = fragment.bottom + data[:image_height]
  else
    # center image in line
    image_top = fragment.top - ((fragment.height - data[:image_height]) / 2.0)
  end
  image_left = fragment.left + ((fragment.width - data[:image_width]) / 2.0)
  if Prawn::SVG::Interface === (image_obj = data[:image_obj])
    image_obj.options[:at] = [image_left, image_top]
    # NOTE: prawn-svg messes with the cursor; use float to workaround
    pdf.float do
      pdf.character_spacing(data[:actual_character_spacing]) { image_obj.draw }
      image_obj.document.warnings.each {|img_warning| logger.warn %(problem encountered in image: #{data[:image_path]}; #{img_warning}) }
    end
  else
    pdf.embed_image image_obj, data[:image_info], at: [image_left, image_top], width: data[:image_width], height: data[:image_height]
  end
  # ...or use the public interface, loading the image again
  #pdf.image data[:image_path], at: [image_left, image_top], width: data[:image_width]

  # prevent any text from being written
  fragment.conceal
end