prawn_column.rb

require 'prawn'

Prawn::Document.generate("./my_pdf.pdf") do
  # Print Name
  fill_color "565656"
  font_size(38) { text "HEADING", align: :center }
  
  move_down 20

  stroke_color "c0c0c0" #dimgray color code
  text "cursor: #{cursor}"
  column_box([0, cursor],:columns => 2, :width => bounds.width) do  

    fill_color "565656"
    font_size(20) { text "SUB HEADING", align: :left }
    
    # move_down 2

    fill_color "000000"


    stroke do
      line_width 0.5
      horizontal_rule
      move_down 6
    end

    string = ((<<-END.gsub(/\s+/,' ')+"\n\n")* 17)
      All the States and Governments by which men are or ever have been ruled,
      have been and are either Republics or Princedoms. Princedoms are either
      hereditary, in which the sovereignty is derived through an ancient line
      of ancestors, or they are new. New Princedoms are either wholly new, as
      that of Milan to Francesco Sforza; or they are like limbs joined on to
      the hereditary possessions of the Prince who acquires them, as the
      Kingdom of Naples to the dominions of the King of Spain. The States thus
      acquired have either been used to live under a Prince or have been free;
      and he who acquires them does so either by his own arms or by the arms of
      others, and either by good fortune or by merit.
    END

    y_position = cursor - 5

    excess_text = text_box  string,
                            width:  bounds.width,
                            height: bounds.height,
                            overflow: :truncate,
                            at: [0, y_position]

    excess_text = text_box excess_text, width: bounds.width, at: [0, y_position - 500]
    text excess_text
    # excess_text = text_box excess_text, width: 300, at: [100, y_position- 100]

    # text string
    # excess_text  = text_box string,
    #                         overflow: :truncate,
    #                         at: [0, bounds.height]

    # while excess_text
    #   fill_color "565656"
    #   font_size(20) { text "SUB HEADING", align: :left }
      
    #   # move_down 2

    #   fill_color "000000"
    #   excess_text  = text_box excess_text,
    #                         overflow: :truncate,
    #                         at: [0, 800]
    # end                       
    # excess_text = text string, overflow: :truncate

    
  end
end