ManimGL is a mature, well-architected Python library for programmatic mathematical animation, using OpenGL (via ModernGL) for GPU-accelerated rendering. Originally created by Grant Sanderson (3Blue1Brown), it is the upstream predecessor to the community edition. The codebase is structured as a library with a CLI entry point (`manimgl`), and it cleanly separates concerns into animation logic, scene management, camera/frame transforms, mobject (math object) types, shader pipelines, and utility modules. The architecture centers on a scene-graph model: `Scene` objects orchestrate `Animation` instances that interpolate between `Mobject` states, while a `Camera` with a `CameraFrame` handles view/projection and feeds into a shader-based rendering pipeline. The system supports real-time interactive preview via an embedded IPython shell, video export via FFmpeg piping, and LaTeX-to-SVG conversion for text. The GLSL shader system is notably sophisticated, with custom `#INSERT` preprocessing to share code between vertex/fragment/geometry shaders for quadratic Bézier rendering, fractals, and lit surfaces. Key reusable components include: a robust event-driven interactive system (event dispatcher + listeners), a disk-caching decorator for expensive computations, a deeply capable Bézier/geometry math library, a flexible color system with colormaps, and a module-reload system that enables live coding. The codebase demonstrates high craftsmanship in its shader architecture, the `CameraFrame` as a fully animatable mobject, and the `TransformMatchingParts` algorithm for morphing between shapes.
BezierKit is a comprehensive Swift library for constructing, manipulating, and computing with Bézier curves and paths. It provides linear, quadratic, and cubic curve types, along with advanced operations including curve-curve intersection (via monotone subdivision with implicitization fallback), offsetting, boolean operations (union, subtract, intersect), bounding box computation, nearest-point projection, arc length via Legendre-Gauss quadrature, and self-intersection removal. The library is designed for cross-platform use (macOS, iOS, Linux, WebAssembly) and includes a macOS demo application for interactive testing. The codebase demonstrates strong software engineering practices: protocol-oriented design, extensive unit tests (including adversarial edge cases), performance optimizations (concrete type overloads, stack allocation, manual memory management in hot paths), and a clean separation of concerns. While pre-release (semver < 1.0) with some known numerical edge cases documented as expected failures, the library is production-ready for vector graphics, CAD, and computational geometry applications.
prawn-svg is a Ruby library that renders SVG (Scalable Vector Graphics) documents into PDF format using the Prawn PDF library. It extends Prawn::Document with an svg() method that parses SVG input, applies CSS styles, handles external resources (images, fonts), and converts SVG elements into Prawn drawing commands. The architecture is modular with separate components for SVG parsing, CSS handling, attribute processing, coordinate transformation, and rendering of various SVG elements including shapes, paths, text, gradients, patterns, clipping paths, and masks. It supports most of the SVG 1.1 specification and provides configurable options for positioning, sizing, and resource loading.