keyframe
A simple library for animation in Rust
Features
- Several easing functions, including user-defined BΓ©zier 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::EaseInOut};
fn example() -> f64 {
let a = 0.0;
let b = 2.0;
let time = 0.5;
ease(EaseInOut, a, b, time)
}Animation sequences:
use keyframe::{keyframes, Keyframe, AnimationSequence};
fn example() {
// (value, time) or (value, time, function)
let mut sequence = keyframes![
(0.5, 0.0), // <-- EaseInOut used from 0.0 to 0.3
(1.5, 0.3, Linear), // <-- Linear used from 0.3 to 1.0
(2.5, 1.0) // <-- Easing function here is never used, since we're at the end
];
sequence.advance_by(0.65);
assert_eq!(sequence.now(), 2.0);
assert_eq!(sequence.duration(), 1.0);
}Custom structures:
use keyframe::mint::Point2;
// This macro works with any structure as long as it only consists of types that implement "CanTween"
use keyframe_derive::CanTween;
#[derive(CanTween)]
struct MySubStructure {
a: f32
}
#[derive(CanTween)]
struct MyStructure {
a: f64,
b: Point2<f64>,
c: f32,
d: [MySubStructure; N] // Array length matching is guaranteed by the type system
}
// Also works with unnamed structures
#[derive(CanTween)]
struct UnnamedStructure(MyStructure, f64);