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Resizing EMF Images in XSSFWorkbook with Apache POI

Learn how to effectively resize `EMF` images in `XSSFWorkbook` using Apache POI. This guide provides an in-depth solution to a common issue faced by Java developers working with Excel files. --- This video is based on the question https://stackoverflow.com/q/68175940/ asked by the user 'dodobird' ( https://stackoverflow.com/u/6354676/ ) and on the answer https://stackoverflow.com/a/68193005/ provided by the user 'Axel Richter' ( https://stackoverflow.com/u/3915431/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Resizing an EMF image in XSSFWorkbook Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Resizing EMF Images in XSSFWorkbook with Apache POI When working with Excel files in Java using the Apache POI library, you may encounter the need to insert and resize images. While resizing images in formats like PNG, JPEG, and DIB is straightforward, handling EMF (Enhanced Metafile) images presents a unique challenge. In this guide, we will walk you through the problem and provide a comprehensive solution to resize EMF images within an XSSFWorkbook. The Problem The main issue here is that the Apache POI library does not provide direct support for resizing EMF images once they are inserted into an XSSFWorkbook. Although you can retrieve dimensions for JPEG, PNG, and DIB images, EMF images require a different approach to manage their sizes. Simply calling the resize method on an EMF picture does not yield the desired result. Many developers face this limitation when trying to create dynamic Excel reports that incorporate vector graphics or other visual elements in EMF format. As a result, we need a workaround to effectively resize inserted EMF images. The Solution Fortunately, Apache POI can help us extract the dimensions from EMF images using the HemfPicture class. This class allows us to create a new HemfPicture object from the byte array of the EMF image. We can then retrieve the correct dimensions and use those to adjust the anchor settings of the image. Here's how: Step-by-Step Breakdown Import Necessary Classes: Ensure you have the required Apache POI libraries and relevant imports in your Java code. [[See Video to Reveal this Text or Code Snippet]] Load the EMF Image: Read the EMF image into a byte array. This allows us to work with the image data. [[See Video to Reveal this Text or Code Snippet]] Retrieve Dimensions: Use the HemfPicture class to get the image dimensions. [[See Video to Reveal this Text or Code Snippet]] Resize the Image: Implement a method to scale the image according to its dimensions. Here, we create scaleCell and resizeHemfPicture methods from the answer provided: [[See Video to Reveal this Text or Code Snippet]] Create and Configure the Workbook: Finalize the workbook by creating a sheet where you want to add the picture, and then insert and resize it as shown in the example code. [[See Video to Reveal this Text or Code Snippet]] Write to File: Finally, save your changes to an Excel file. [[See Video to Reveal this Text or Code Snippet]] Key Takeaways The internal handling of EMF image resizing in Apache POI requires a different approach compared to common image formats. Leveraging the HemfPicture class gives access to width and height dimensions. Custom scaling and anchoring methods must be defined since direct accessibilities are limited. By following these steps, you can successfully resize EMF images in XSSFWorkbook. This approach not only improves the quality of your Excel reports but also enhances the overall functionality of your Java applications that utilize Apache POI. Feel free to explore the code shared here and adjust it to meet your project's specific requirements.