How to Flip or Mirror PDFs in C# Using iText 8.0.1

Learn how to effectively flip or mirror PDF documents in C# with iText 8.0.1, including essential code solutions and explanations.
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How to Flip or Mirror PDFs in C# Using iText 8.0.1

Are you looking to enhance your PDF manipulation skills in C# ? Specifically, do you want to learn how to flip or mirror PDF documents using the latest version of iText, iText 8.0.1? In this guide, we will walk you through a clear and detailed solution to achieve this functionality.

Introduction

When working with PDF documents, there are times when you may need to modify the layout of your pages. One popular operation is flipping or mirroring the pages of a PDF. This can be especially useful in various applications, such as printing graphics or documents that require reflection.

In this post, we will take a look at how to translate a function originally designed for iTextSharp 5.5 into a more modern implementation using iText 8.0.1. We'll provide a complete code example that incorporates adding a black frame around the mirrored content.

The Challenge: Migrating from iTextSharp 5.5 to iText 8.0.1

When migrating code from iTextSharp 5.5 to iText 8.0.1, the methods and classes might have changed, requiring a rework of the logic used to achieve outcomes like mirroring a PDF. Below is a brief overview of what the original code aimed to accomplish:

Open a PDF document.

Flip (mirror) its contents based on a user-defined boolean parameter.

Optionally, add a black frame around the content.

Save the modified content into a new PDF file.

Original Function Overview

Here is a simplified version of the functionality the original iTextSharp code implemented:

[[See Video to Reveal this Text or Code Snippet]]

While the old function successfully completed these tasks, several changes in the iText library's structure and performance optimizations necessitated a new approach in iText 8.0.1.

Updated Solution Using iText 8.0.1

Let's explore the updated version of the FlipPDF function compatible with iText 8. Here's how to achieve the desired functionality:

Complete Code

[[See Video to Reveal this Text or Code Snippet]]

Explanation of Key Sections

Reading the Input PDF:
We initiate the reading of the PDF using PdfReader, allowing our application to access and manipulate the input PDF documents.

Loop through each page:
We iterate through the pages of the original PDF. For each page, if mirroring is required, we add a new page in the output document with its dimensions preserved.

Applying Transformation:

To achieve the flip effect, AffineTransform is used which lets us scale the page negatively on the x-axis, thus flipping the content.

A copy of the original page is added to apply this transformation.

Adding a Frame:

When the addFrame option is selected, we draw a rectangle around the page using the PdfCanvas class, enhancing the visual presentation.

Conclusion

In summary, we have walked you through how to effectively flip and mirror PDF content using the updated iText 8.0.1 library in C# . This functionality can be highly useful in various applications, and the code presented here is ready to deploy in your projects. Don’t hesitate to reach out with questions or experiences regarding PDF manipulations!

Stay tuned for more interesting topics on C# and iText you can implement in your applications.

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