Actions

This page applies to every backend the same way. Whichever one you picked, you already have a builder, called b below.

Describing a change

An action says what should change, not how long it takes.

let action = b.act(subject, path!(<Type>::field), |current| new_value);

• subject: which thing to animate. An id, a Bevy Entity, whatever your backend uses.
• path!(<Type>::field): which field on it.
• The closure: takes the field’s current value, returns its target value.

Giving it timing

.play(duration) turns an action into a TrackFragment.

let fragment = action.play(s(1));

Add an easing function before .play() to change how it moves between the two values, instead of a straight line:

let fragment = action.with_ease(ease::cubic::ease_in_out).play(s(1));

Next

Ordering: combine several fragments together.