prawn-table-height.rb

require 'prawn'
require 'prawn/layout'
      
Prawn::Document.generate("prawn-table-height.pdf") do
  data = [["This is a line"]] * 10 
  
  row_height = font.ascender - font.descender + font.line_gap
  
  10.times do |i|
    stroke_rectangle([0, bounds.top - (i * row_height)], 100, row_height)
  end
  
  table(data, 
    :font_size => 12,
    :vertical_padding => 0,
    :horizontal_padding => 0)
end