airbnb/lottie-web
Lottie Web
This project is a cross-platform animation engine and vector animation player designed to render complex motion graphics within web browsers. It functions as a declarative motion framework, allowing developers to decouple visual design from application logic by using structured data files to define sophisticated animations.
The library distinguishes itself by offering multiple rendering paths, including native support for vector graphics through the browser document object model and raster-based drawing via canvas elements. It utilizes a dedicated property interpolation engine to calculate keyframe states and timing curves, ensuring that motion remains consistent and crisp across different screen resolutions and platforms.
The engine manages the full lifecycle of an animation, from parsing structured data files to orchestrating playback loops that synchronize with the browser refresh rate. By organizing visual elements into a nested composition hierarchy, it supports the delivery of lightweight, interactive assets that respond to user input while maintaining performance through hardware-accelerated rendering.
Features
- Animation Engines - Translates complex motion design files into high-performance visual output across platforms.
- Vector Animation Libraries - Parses JSON-based animation data and renders it as interactive vector graphics.
- Declarative Motion Frameworks - Defines sophisticated animations through structured data files that decouple design from logic.
- Dynamic Vector Graphics - Maps animation properties to DOM elements to leverage native vector graphics engines.
- Transitions & Effects - Calculates intermediate values between keyframes using mathematical easing functions.
- Rendering - Leverages hardware-accelerated drawing techniques to maintain smooth frame rates.
- Cross-Platform Motion Systems - Enables sharing consistent animation assets across web, mobile, and desktop applications.
- Animation Loop Orchestrators - Synchronizes animation updates with the browser display refresh rate for smooth motion.
- Interactive Animation Triggers - Triggers fluid, programmatic animations in response to user interactions like clicks and hovers.
