prawnpdf/prawn

# frozen_string_literal: true

require 'prawn/manual_builder'

Prawn::ManualBuilder::Chapter.new do
  title 'Windown-1252 Charset'

  text do
    prose <<~TEXT
      Here's a list of all of the glyphs that can be rendered by Adobe's built
      in fonts, along with their character widths and WinAnsi codes.  Be sure
      to pass these glyphs as UTF-8, and Prawn will transcode them for you.
    TEXT
  end

  example new_page: true do
    font 'Helvetica', size: 10

    x = 0
    y = bounds.top

    fields = [[20, :right], [8, :left], [12, :center], [30, :right], [8, :left], [0, :left]]

    Prawn::Encoding::WinAnsi::CHARACTERS.each_with_index do |name, index|
      next if name == '.notdef'

      y -= font_size
      if y < font_size
        y = bounds.top - font_size
        x += 170
      end

      code = format('%<index>d.', index: index)
      char = index.chr.force_encoding(::Encoding::Windows_1252)

      width = 1000 * width_of(char, size: font_size) / font_size
      size = format('%<width>d', width: width)

      data = [code, nil, char, size, nil, name]
      dx = x
      fields.zip(data).each do |(total_width, align), field|
        if field
          width = width_of(field, size: font_size)

          case align
          when :left then offset = 0
          when :right then offset = total_width - width
          when :center then offset = (total_width - width) / 2
          end

          text_box(field.dup.force_encoding('windows-1252').encode('UTF-8'), at: [dx + offset, y])
        end

        dx += total_width
      end
    end
  end
end