package.lib.interpolate.js Maven / Gradle / Ivy

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A collection of utility functions for animations.

There is a newer version: 10.17.0

import { mix } from "./mix";
import { noopReturn } from "./noop";
import { defaultOffset, fillOffset } from "./offset";
import { progress } from "./progress";
import { getEasingForSegment } from "./easing";
import { clamp } from "./clamp";
export function interpolate(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 = clamp(0, 1, progress(input[i], input[i + 1], t));
        const segmentEasing = getEasingForSegment(easing, i);
        progressInRange = segmentEasing(progressInRange);
        return mix(output[i], output[i + 1], progressInRange);
    };
}
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