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PDF imposition in Go

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Sample Go 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 Go PDF Library and PDF Editing & Manipulation Library.

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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2021 by PDFTron Systems Inc. All Rights Reserved.
// Consult LICENSE.txt regarding license information.
//---------------------------------------------------------------------------------------

package main
import (
	"fmt"
    "os"
	. "pdftron"
)

import  "pdftron/Samples/LicenseKey/GO"

//-----------------------------------------------------------------------------------
// 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. 
//-----------------------------------------------------------------------------------

func main(){
    PDFNetInitialize(PDFTronLicense.Key)

    //var resource_path = ""
    //if len(os.Args) > 3{
    //    resource_path = os.Args[3]
    //}else{
    //    resource_path = "../../../resources"
    //}
    
    // Relative path to the folder containing the test files.
    inputPath := "../../TestFiles/newsletter.pdf"
    outputPath := "../../TestFiles/Output/newsletter_booklet.pdf"
    
    fmt.Println("-------------------------------------------------")
    fmt.Println("Opening the input pdf...")
    
    var filein = ""
    if len(os.Args) > 1{
        filein = os.Args[1]
    }else{
        filein = inputPath
    }
    var fileout = ""
    if len(os.Args) > 2{
        fileout = os.Args[2]
    }else{
        fileout = outputPath
    }
    
    inDoc := NewPDFDoc(filein)
    inDoc.InitSecurityHandler()
    
    // Create a list of pages to import from one PDF document to another
    importPages := NewVectorPage()
    itr := inDoc.GetPageIterator()
    for itr.HasNext(){
        importPages.Add(itr.Current())
        itr.Next()
    }

    newDoc := NewPDFDoc()
    importedPages := newDoc.ImportPages(importPages)

    // Paper dimension for A3 format in points. Because one inch has 
    // 72 points, 11.69 inch 72 = 841.69 points
    mediaDox := NewRect(0.0, 0.0, 1190.88, 841.69)
    midPoint := mediaDox.Width()/2

    builder := NewElementBuilder()
    writer := NewElementWriter()

    i := 0    
    for i < int(importedPages.Size()){
        // Create a blank new A3 page and place on it two pages from the input document.
        newPage := newDoc.PageCreate(mediaDox)
        writer.Begin(newPage)
        
        // Place the first page
        srcPage := importedPages.Get(i)
        
        element := builder.CreateForm(importedPages.Get(i))
        sc_x := midPoint / srcPage.GetPageWidth()
        sc_y := mediaDox.Height() / srcPage.GetPageHeight()
        var scale = 0.0
        if sc_x < sc_y { // min(sc_x, sc_y)
            scale = sc_x
        }else{
            scale = sc_y
        } 
        element.GetGState().SetTransform(scale, 0.0, 0.0, scale, 0.0, 0.0)
        writer.WritePlacedElement(element)
        
        // Place the second page
        i = i + 1
        if i < int(importedPages.Size()){
            srcPage = importedPages.Get(i)
            element = builder.CreateForm(srcPage)
            sc_x = midPoint / srcPage.GetPageWidth()
            sc_y = mediaDox.Height() / srcPage.GetPageHeight()
            if sc_x < sc_y { // min(sc_x, sc_y)
                scale = sc_x
            }else{
                scale = sc_y
            } 
            element.GetGState().SetTransform(scale, 0.0, 0.0, scale, midPoint, 0.0)
            writer.WritePlacedElement(element)
        }    
        writer.End()
        newDoc.PagePushBack(newPage)
        i = i + 1
    }    
    newDoc.Save(fileout, uint(SDFDocE_linearized))
    PDFNetTerminate()
    fmt.Println("Done. Result saved in newsletter_booklet.pdf...")
}