prawn：Prawn::Table :position

everyday Ruby 
#!/usr/bin/env ruby

require "prawn"
require "prawn/layout"

data = [["Gregory","Brown"],["James","Healy"],["Jia","Wu"]]

pdf = Prawn::Document.new

pdf.table data, :headers  => ["First Name", "Last Name"],
                :position => :left

pdf.table data, :headers  => ["First Name", "Last Name"],
                :position => :center

pdf.table data, :headers  => ["First Name", "Last Name"],
                :position => 100

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