Reverse Method

Summary

Flips the specified pages horizontally.

Syntax

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

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

Reference

DocumentPages Class

DocumentPages Members

Leadtools.Document Namespace

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Help Version 23.0.2024.2.29

Leadtools.Document Assembly

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Leadtools.Document Namespace

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