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PDF imposition in Ruby

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Sample Ruby code for using PDFTron SDK to impose (combine) multiple PDF pages. Page imposition can be used to arrange/order pages prior to printing or for document assembly (assemble a 'master' page from several 'source' pages). It is also possible to write applications that can re-order the pages such that they will display in the correct order when the hard copy pages are compiled and folded correctly. Learn more about our Ruby PDF Library and PDF Editing & Manipulation Library.

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#---------------------------------------------------------------------------------------
# Copyright (c) 2001-2020 by PDFTron Systems Inc. All Rights Reserved.
# Consult LICENSE.txt regarding license information.
#---------------------------------------------------------------------------------------

require '../../../PDFNetC/Lib/PDFNetRuby'
include PDFNetRuby

$stdout.sync = true

# Relative path to the folder containing the test files.
input_path = "../../TestFiles/newsletter.pdf"
output_path = "../../TestFiles/Output/newsletter_booklet.pdf"

#-----------------------------------------------------------------------------------
# The sample illustrates how multiple pages can be combined/imposed 
# using PDFNet. Page imposition can be used to arrange/order pages 
# prior to printing or to assemble a 'master' page from several 'source' 
# pages. Using PDFNet API it is possible to write applications that can 
# re-order the pages such that they will display in the correct order 
# when the hard copy pages are compiled and folded correctly. 
#-----------------------------------------------------------------------------------

	PDFNet.Initialize
	
	puts "-------------------------------------------------"
	puts "Opening the input pdf..."
	
	in_doc = PDFDoc.new(input_path)
	in_doc.InitSecurityHandler
	
	# Create a list of pages to import from one PDF document to another
	import_pages = VectorPage.new
	itr = in_doc.GetPageIterator
	while itr.HasNext do
		import_pages << (itr.Current)
		itr.Next
	end

	new_doc = PDFDoc.new
	imported_pages = new_doc.ImportPages(import_pages)

	# Paper dimension for A3 format in points. Because one inch has 
	# 72 points, 11.69 inch 72 = 841.69 points
	media_box = Rect.new(0, 0, 1190.88, 841.69)
	mid_point = media_box.Width/2

	builder = ElementBuilder.new
	writer = ElementWriter.new

	i = 0	
	while i < imported_pages.size do
		# Create a blank new A3 page and place on it two pages from the input document.
		new_page = new_doc.PageCreate(media_box)
		writer.Begin(new_page)
		
		# Place the first page
		src_page = imported_pages[i]
		
		element = builder.CreateForm(imported_pages[i])
		sc_x = mid_point / src_page.GetPageWidth
		sc_y = media_box.Height / src_page.GetPageHeight
		scale = sc_x < sc_y ? sc_x : sc_y	# min(sc_x, sc_y)
		element.GetGState.SetTransform(scale, 0, 0, scale, 0, 0)
		writer.WritePlacedElement(element)
		
		# Place the second page
		i = i + 1
		if i < imported_pages.size
			src_page = imported_pages[i]
			element = builder.CreateForm(src_page)
			sc_x = mid_point / src_page.GetPageWidth
			sc_y = media_box.Height / src_page.GetPageHeight
			scale = sc_x < sc_y ? sc_x : sc_y	# min(sc_x, sc_y)
			element.GetGState.SetTransform(scale, 0, 0, scale, mid_point, 0)
			writer.WritePlacedElement(element)
		end
			
		writer.End
		new_doc.PagePushBack(new_page)
		i = i + 1
	end
		
	new_doc.Save(output_path, SDFDoc::E_linearized)
	puts "Done. Result saved in newsletter_booklet.pdf..."
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