jung-kurt/gofpdfArchived
Gofpdf
Dies ist eine Go-basierte PDF-Bibliothek zur programmatischen Generierung von PDF-Dokumenten ohne Abhängigkeit von externen C-Bibliotheken. Sie fungiert als Dokumentengenerator, Layout-Engine, Sicherheitstool und Vektorgrafik-Engine zur Erstellung von Dateien, die Text, Bilder und geometrische Formen enthalten.
Das Projekt zeichnet sich durch eine zellbasierte Layout-Engine aus, die automatischen Textumbruch, Seitenumbrüche und strukturierte Positionierung verwaltet. Es bietet spezialisierte Funktionen für Vektorgrafiken, einschließlich des Renderns von Bézier-Kurven und Polygonen, sowie ein Sicherheitstoolkit zum Anwenden von Passwortschutz und zum Einschränken von Druck- oder Änderungsberechtigungen.
Die Bibliothek deckt ein breites Spektrum an Dokumentfunktionen ab, einschließlich Schriftverwaltung für TrueType- und OpenType-Schriften, Bildeinbettung mit Transparenzunterstützung und die Erstellung interaktiver Elemente wie Hyperlinks und Lesezeichen. Sie handhabt zudem Datenvisualisierung für Barcodes und Diagramme, HTML-Subset-Rendering für Textstyling sowie die Verwaltung optionaler Inhaltsebenen und wiederverwendbarer Dokumentvorlagen.
Features
- PDF Document Generation - Programmatically generates binary PDF files from scratch to automate the production of reports and invoices.
- Cell-Based Layout Engines - Implements a cell-based layout engine to handle automatic text wrapping and structured positioning across pages.
- PDF Libraries - Provides a Go-based implementation for the programmatic generation and manipulation of PDF documents.
- Document Layout Tools - Provides tools for organizing pages with automatic text wrapping, headers, footers, and grid-based positioning.
- Paginated Document Layouts - Manages page formats, margins, orientation, and automatic page breaks with integrated headers and footers.
- PDF Layout Engines - Implements a system for managing page formats, margins, and cell-based text wrapping for structured documents.
- Coordinate-Based Graphic Rendering - Provides the ability to draw shapes and graphics using absolute page coordinates for precise placement.
- Text Rendering - Prints text using custom fonts with support for alignment, wrapping, superscripts, and subscripts.
- PDF Image Embedding - Inserts raster images and path-only SVG images with support for transparency and DPI scaling.
- PDF Vector Graphics - Draws precise lines, Bézier curves, and geometric shapes directly onto PDF pages.
- PDF Vector Graphics Engines - Implements a full toolkit for drawing Bézier curves, polygons, and shapes with customizable colors and gradients.
- PDF Security and Signing - Provides comprehensive capabilities for managing PDF password protection, permission settings, and digital signature application.
- Document Password Protection - Secures files with user and owner passwords to restrict printing, modifying, or copying of content.
- PDF Font Embedding - Imports standard and custom TrueType and OpenType fonts with support for UTF-8 and right-to-left languages.
- Document Templating - Enables the creation of reusable content blocks that can be instantiated and repeated across multiple pages.
- Password-Based Encryption - Secures documents using password-based encryption to restrict unauthorized viewing, printing, or modification.
- Coordinate Transformations - Applies transformation matrices to rotate, scale, or translate text and graphics relative to a coordinate point.
- Data Visualization Libraries - Generates barcodes, coordinate grids, and charts to visually represent quantitative data.
- Gradient Renderers - Defines RGB, CMYK, and spot colors along with linear or radial gradients for fills and strokes.
- PDF Interactive Elements - Supports the creation and insertion of interactive PDF components such as internal bookmarks, external hyperlinks, and file attachments.
- Programmatic Data Visualization - Automatically generates barcodes, coordinate grids, and mathematical plots to represent quantitative data.
- Page Hierarchies - Provides structural organization for documents through the management of pages, headers, footers, and outline bookmarks.
- PDF Font Embedding - Embeds TrueType and OpenType font glyphs directly into the PDF binary to ensure consistent rendering.
- HTML-to-PDF Text Stylers - Converts a subset of HTML tags for text styling, alignment, and hyperlinks into PDF document content.
- Template Engines - PDF document generator.
