animation

Animation timing without a framework: Easing curves (the CSS keywords, cubic-bezier(), steps() and linear(), read from a CSS string or built directly), physical Springs with their settling time, and to_css_linear to turn any curve into a CSS linear().

The same model as the TypeScript package’s animation category, for code that computes animation values itself (a renderer, a native player, a tool that exports animations).

Install

Cargo feature animation (enabled by default). To compile only this module:

cargo add helpers4 --no-default-features --features animation

or in Cargo.toml:

[dependencies]
helpers4 = { version = "0.0.9", default-features = false, features = ["animation"] }

Import path: helpers4::animation.

Items

Item	What it does
Easing	A timing curve: how the progress of an animation follows the progress of time, from 0.0 to 1.0.
Spring	A damped spring going from 0.0 to 1.0: the curve behind “spring” transitions of design tools, with the time it takes to settle.
StepPosition	Where the jumps of a steps() easing happen, as in CSS.
to_css_linear	Samples an easing function into a CSS linear() easing, so that any curve (a Spring, a custom bounce) can be played by CSS transitions and the Web Animations API, which do not take code.

Error types

Documented on the page of the helper that returns them.

Type	Returned by
ParseEasingError	Easing