keyframe

A simple library for animation in Rust

Features

• Several easing functions, including user-defined Bézier curves (like CSS cubic-bezier) and keyframable curves
• Animation sequences (like CSS @keyframes)
• mint integration for 2D/3D/4D support (points, rectangles, colors, etc)

Usage

Tweening between two values is done with keyframe::ease(function, from, to, time). from and to can be any type that implements CanTween, such as f64 or mint::Vector2, while time needs to be a floating-point value between zero and one. function specifies the transition between from and to and is any type that implements EasingFunction.

keyframe::AnimationSequence can be used to create more complex animations that keep track of keyframes, time, etc. You can create animation sequences with the keyframes![...] macro, from an iterator or from a vector.

Examples

An example visualizer is included in examples/. Run cargo run --example visualizer --release to start it. (ggez is really slow in debug mode!)

Tweening:

use keyframe::{ease, functions::*};

fn example() -> f64 {
    let a = 0.0;
    let b = 2.0;
    let time = 0.5;

    ease(EaseInOut, a, b, time)
}

Animation sequences:

#[macro_use]
extern crate keyframe;

use keyframe::{Keyframe, AnimationSequence};

fn example() {
    // (value, time) or (value, time, function)
    let sequence = keyframes![
        (0.5, 0.0), 
        (1.5, 0.3, EaseIn), // <-- EaseIn used from 0.0 to 0.3
        (2.5, 1.0, Linear) // <-- Linear used from 0.3 to 1.0
    ];

    sequence.advance_by(0.65);

    assert_eq!(sequence.now(), 2.0);
    assert_eq!(sequence.duration(), 1.0);
}