motion/dist/targets/js/utils/interpolate.es.js

The Motion library for the web

import { progress, mix } from 'popmotion';
import { noopReturn } from '../../../utils/noop.es.js';
import { getEasingForSegment } from './get-easing.es.js';
import { defaultOffset, fillOffset } from './offset.es.js';

const clampProgress = (p) => Math.min(1, Math.max(p, 0));
function slowInterpolateNumbers(output, input = defaultOffset(output.length), easing = noopReturn) {
    const length = output.length;
    /**
     * If the input length is lower than the output we
     * fill the input to match. This currently assumes the input
     * is an animation progress value so is a good candidate for
     * moving outside the function.
     */
    const remainder = length - input.length;
    remainder > 0 && fillOffset(input, remainder);
    return (t) => {
        let i = 0;
        for (; i < length - 2; i++) {
            if (t < input[i + 1])
                break;
        }
        let progressInRange = clampProgress(progress(input[i], input[i + 1], t));
        const segmentEasing = getEasingForSegment(easing, i);
        progressInRange = segmentEasing(progressInRange);
        return mix(output[i], output[i + 1], progressInRange);
    };
}

export { slowInterpolateNumbers };