prawn：Prawn::Text#text_box :leading

#!/usr/bin/env ruby

require "prawn"

pdf = Prawn::Document.new

#pdf.text_box "no :leading no :leading no :leading no :leading no :leading no :leading no :leading no :leading no :leading no :leading", :align => :left
pdf.text_box ":leading => 10 :leading => 10 :leading => 10 :leading => 10 :leading => 10 :leading => 10 :leading => 10 :leading => 10", :leading => 10

pdf.render_file(File.basename($0, ".rb") + ".pdf")