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Reverse Method

Summary

Flips the specified pages horizontally.

Syntax
C#
C++/CLI
Python
public void Reverse( 
   int firstPageNumber, 
   int lastPageNumber 
) 
public:  
   void Reverse( 
      Int32 firstPageNumber, 
      Int32 lastPageNumber 
   ) 
def Reverse(self,firstPageNumber,lastPageNumber): 

Parameters

firstPageNumber

1-based first page number in the document. This value must be greater than or equal to 1.

lastPageNumber

1-based last page number in the document. This value must be greater or equal to firstPageNumber. A value of -1 means the last page in the document.

Remarks

This method loops through all the pages specified and calls DocumentPage.Reverse. Refer to Document Page Transformation. for more information.

Example
C#
Java
using Leadtools; 
using Leadtools.Document; 
using Leadtools.Document.Converter; 
using Leadtools.Document.Writer; 
 
 
public void DocumentPagesReverseExample() 
{ 
   var documentUri = new Uri("https://demo.leadtools.com/images/pdf/leadtools.pdf"); 
   string documentFile = Path.Combine(LEAD_VARS.ImagesDir, "PagesModified.pdf"); 
 
   // Load this document  
   var loadDocumentOptions = new LoadDocumentOptions(); 
   using (var document = DocumentFactory.LoadFromUri(documentUri, loadDocumentOptions)) 
   { 
      using (var documentConverter = new DocumentConverter()) 
      { 
         // Documents are read-only by default and we cannot modify them. Fix that 
         document.IsReadOnly = false; 
 
         // Get and store the first page of the document 
         DocumentPage page = document.Pages[0]; 
 
         // This document has 5 pages 
 
         // Reverse the page 
         page.Reverse(); 
 
         var jobData = new DocumentConverterJobData(); 
         // The loaded document is our input  
         jobData.Document = document; 
         // We want PDF as output  
         jobData.DocumentFormat = DocumentFormat.Pdf; 
         // Into this file  
         jobData.OutputDocumentFileName = documentFile; 
 
         var job = documentConverter.Jobs.CreateJob(jobData); 
         documentConverter.Jobs.RunJob(job); 
      } 
   } 
   // Show the result 
   Process.Start(documentFile); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
} 
 
import static org.junit.Assert.assertTrue; 
 
import java.io.File; 
import java.io.IOException; 
import java.net.URI; 
import java.net.URISyntaxException; 
import java.util.concurrent.ExecutorService; 
import java.util.concurrent.Executors; 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
 
import leadtools.*; 
import leadtools.document.*; 
import leadtools.document.converter.*; 
import leadtools.document.writer.*; 
 
 
public void documentPagesReverseExample() throws URISyntaxException { 
   Platform.loadLibrary(LTLibrary.DOCUMENT_WRITER); 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   URI documentUri = new URI("https://demo.leadtools.com/images/pdf/leadtools.pdf"); 
   String documentFile = combine(LEAD_VARS_IMAGES_DIR, "PagesModified.pdf"); 
 
   int availableProcessors = Runtime.getRuntime().availableProcessors(); 
   ExecutorService pool = Executors.newFixedThreadPool(availableProcessors); 
   RasterDefaults.setExecutorService(pool); 
 
   // Load this document 
   LoadDocumentOptions loadDocumentOptions = new LoadDocumentOptions(); 
   LEADDocument document = DocumentFactory.loadFromUri(documentUri, loadDocumentOptions); 
 
   DocumentConverter documentConverter = new DocumentConverter(); 
 
   // Documents are read-only by default and we cannot modify them. Fix that 
   document.setReadOnly(false); 
 
   // Get and store the first page of the document 
   DocumentPage page = document.getPages().get(0); 
 
   // Reverse the page 
   page.reverse(); 
 
   // Set the job data 
   DocumentConverterJobData jobData = new DocumentConverterJobData(); 
   // The loaded document is our input 
   jobData.setDocument(document); 
   // We want PDF as output 
   jobData.setDocumentFormat(DocumentFormat.PDF); 
   // Into this file 
   jobData.setOutputDocumentFileName(documentFile); 
 
   DocumentConverterJob job = documentConverter.getJobs().createJob(jobData); 
 
   // Run the job to save the file 
   documentConverter.getJobs().runJob(job); 
 
   if (job.getErrors().isEmpty()) { 
      System.out.println("Converted successfully to " + documentFile); 
   } else { 
      for (DocumentConverterJobError e : job.getErrors()) { 
         System.out.println(e.getError()); 
      } 
   } 
   assertTrue(job.getErrors().isEmpty()); 
} 
Requirements

Target Platforms

Help Version 23.0.2024.2.29
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© 1991-2024 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Document Assembly
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.