List line-height each font with prawn

list_line_height.rb

require 'prawn'

fonts = [
  ['Helvetica', 'Agj'],
  ['Courier', 'Agj'],
  ['Times-Roman', 'Agj'],
  ['fonts/ipag.ttf', 'Agjぽ'],
  ['fonts/ipagp.ttf', 'Agjぽ']
]

font_sizes = [8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 72]

results = []

pdf = Prawn::Document.new

fonts.each do |(family, string)|
  font_sizes.each do |font_size|
    pdf.font(family, size: font_size) do
      result = [
        family,
        font_size,
        pdf.width_of(string),
        pdf.height_of(string)
      ]
      puts result.join(',')
    end
  end
end