julianshapiro/velocity
Velocity
Velocity is a JavaScript animation library used to create high-performance CSS and SVG animations. It functions as a CSS property interpolator and a spring physics engine, enabling the creation of smooth visual transitions and organic movement for web elements.
The project provides a programmatic interface for modifying vector attributes and 3D transformations through its SVG animation framework. It further distinguishes itself as an animation sequence orchestrator, allowing for the chaining of movements and the staggering of start times across multiple elements using promises.
The library covers a broad range of motion capabilities, including physics-based motion, complex animation sequencing, and high-performance UI transitions. It includes tools for managing animation playback and timing, as well as mechanisms for frame rate limiting to maintain consistent visual fluidity.
Features
- CSS Animations - Creates smooth visual transitions and motion for web elements by animating CSS properties over time.
- Animation Loop Orchestrators - Uses a centralized global timer to synchronize visual updates with browser refresh cycles.
- Vector Animation Libraries - Modifies vector attributes and applies 3D transformations to create smooth motion for scalable graphics.
- CSS Unit Interpolation - Parses CSS unit strings into numeric values to calculate incremental changes during transitions.
- Web Interface Animation Libraries - Provides a comprehensive library for creating smooth visual transitions and movement for web elements.
- Animation Interpolators - Animates string-based values like colors and units by calculating the numeric difference between start and end states.
- CSS Property Transitions - Maps start and end styles through mathematical easing functions to update CSS numerical and color properties.
- Physics-Based Animations - Simulates physical spring motion to create natural and organic movement during transitions.
- Animation Libraries - Implements a high-performance library for creating transitions and motion effects in web interfaces.
- Animation Orchestrators - Links multiple animation tasks together to execute specific sequences of movements on target elements.
- Physics-Based Motion Models - Calculates element positions using mass, stiffness, and damping constants to simulate natural physical movement.
- High-Performance Interpolation - Uses high-performance property interpolation to maintain fluid frame rates during visual transitions.
- Physics Engines - Simulates physical properties like damping and stiffness to drive organic, physics-based motion.
- Animation Sequencing - Staggers start times and organizes animations into ordered sequences to create structured visual patterns.
- SVG Animation Libraries - Provides a programmatic interface for modifying vector attributes and applying 3D transformations to SVG graphics.
- Custom Animation Effects - Provides the ability to define unique animation behaviors and sequences to extend motion capabilities.
- Frame Rate Capping - Limits the number of updates per second to maintain consistent performance across different hardware capabilities.
- Animation Timing Utilities - Adjusts playback speed, sets start delays, and loops sequences to repeat visual transitions.
- Promise-Based Chains - Wraps animation completion events in promises to allow asynchronous orchestration of sequential visual tasks.
- Animation Easing Functions - Provides mathematical easing functions to control the acceleration and deceleration of property transitions.
- Animation Controls - Provides programmatic methods to pause, resume, or stop active animation sequences.
- Animation Timelines - Defines multi-step animation sequences using keyframes to control transforms, origins, and timing functions.
- Animation Playback Controls - Regulates timing and flow by pausing, resuming, or stopping animations globally or on a per-element basis.
- Asynchronous Synchronization - Returns promises upon animation completion to synchronize visual updates with asynchronous code patterns.
- CSS Property Modifiers - Provides a programmatic interface to read and update CSS properties and element visibility states.
- Keyframe Animation Engines - Defines a series of discrete value states and timing offsets to control complex multi-step transitions.
- Staggered Animation Trails - Coordinates start times across multiple elements to trigger staggered visual updates.
- Animation and Motion - High-performance JavaScript animation engine.
- Animations and Motion - Accelerates JavaScript-based animation performance.
- General Animation Engines - Accelerated JavaScript animation engine.
- 动画(Animate) - Listed in the “动画(Animate)” section of the Awesome Frontend awesome list.
