@lightningjs/renderer/dist/src/core/animations/Transition.js

Lightning 3 Renderer

export function easedProgressFn(p) {
    return this.from + (this.to - this.from) * this.easing(p);
}
export function linearProgressFn(p) {
    return this.from + (this.to - this.from) * p;
}
export function updateTransition(animationTime) {
    //calculate progress of transition
    let p = (animationTime - this.delay) / this.duration;
    if (p >= 1) {
        p = 1;
        return (this.current = this.to);
    }
    if (p < 0) {
        p = 0;
        return (this.current = this.from);
    }
    return (this.current = this.progressFn(p));
}
export function createTransition(props) {
    const easing = props.easing;
    //cast props to Transition to add new properties and methods without creating a new object
    const transition = props;
    // Convert string values to numbers and add new properties
    transition.to = props.to;
    transition.from = props.from;
    transition.current = (props.from ?? props.to);
    transition.progress = 0;
    transition.easing = easing;
    transition.update = updateTransition;
    transition.progressFn =
        easing !== undefined ? easedProgressFn : linearProgressFn;
    return transition;
}
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