How to Build a PDF Storyboard Generator Using JavaScript
freeCodeCamp.org · 软件开发
PDF files are commonly used to share presentations, scripts, reports, lesson materials, comic pages, and other visual documents. But reviewing a long PDF page by page can take time, especially when someone needs to understand the overall sequence of scenes, slides, or visual content. A storyboard provides a more organized way to review this information. Instead of opening every page individually, users can arrange selected PDF pages into a single sheet containing multiple panels. Each panel can include a page number, a caption, and a visual preview of the original page. In this tutorial, we'll explore how to build a browser-based PDF Storyboard Generator using JavaScript, PDF.js, and PDF-lib. The application takes pages from an existing PDF and arranges them into printable storyboard sheets. Users can choose different layouts, select the pages they want to include, add captions, customize the appearance, preview the result, and download the finished storyboard. The application runs directly in the browser. The uploaded PDF is processed locally rather than uploaded to the website's server. We'll examine the implementation step by step, including PDF rendering, page selection, caption handling, layout calculations, preview generation, and file export. What We'll Cover: What Is a PDF Storyboard Generator? Main Features of the Application Understanding the Browser-Based Workflow Project Setup Libraries Used Preparing the HTML Workspace Selecting the Main DOM Elements Defining Important Configuration Values Understanding the Application State Uploading a PDF Loading the PDF with PDF.js Measuring PDF Pages Rendering PDF Pages on Canvas Reusing Rendered Page Previews Reading Text from PDF Pages Filling Empty Captions Automatically Updating the Preview Choosing the Storyboard Layout Controlling Rows, Columns, and Paper Size Selecting PDF Pages and Their Order Adding Panel Labels Drawing the Storyboard Sheet Updating the Live Preview Adjusting Caption Appearance Navigating B