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PDF imposition in Python

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Sample Python 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 Python 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.
#---------------------------------------------------------------------------------------

import site
site.addsitedir("../../../PDFNetC/Lib")
import sys
from PDFNetPython import *

#-----------------------------------------------------------------------------------
# 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. 
#-----------------------------------------------------------------------------------

def main(args):
    PDFNet.Initialize()
    
    resource_path = args[3] if len(args) > 3 else "../../../resources"
    
    # Relative path to the folder containing the test files.
    input_path = "../../TestFiles/newsletter.pdf"
    output_path = "../../TestFiles/Output/newsletter_booklet.pdf"
    
    print("-------------------------------------------------")
    print("Opening the input pdf...")
    
    filein = args[1] if len(args)>1 else input_path
    fileout = args[2] if len(args)>2 else output_path
    
    in_doc = PDFDoc(filein)
    in_doc.InitSecurityHandler()
    
    # Create a list of pages to import from one PDF document to another
    import_pages = VectorPage()
    itr = in_doc.GetPageIterator()
    while itr.HasNext():
        import_pages.append(itr.Current())
        itr.Next()

    new_doc = PDFDoc()
    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(0, 0, 1190.88, 841.69)
    mid_point = media_box.Width()/2

    builder = ElementBuilder()
    writer = ElementWriter()

    i = 0    
    while i < len(imported_pages):
        # 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 if sc_x < sc_y else 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 < len(imported_pages):
            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 if sc_x < sc_y else sc_y # min(sc_x, sc_y)
            element.GetGState().SetTransform(scale, 0, 0, scale, mid_point, 0)
            writer.WritePlacedElement(element)
            
        writer.End()
        new_doc.PagePushBack(new_page)
        i = i + 1
        
    new_doc.Save(fileout, SDFDoc.e_linearized)
    print("Done. Result saved in newsletter_booklet.pdf...")
    
if __name__ == '__main__':
    args = []
    main(args)
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