63 lines
2.5 KiB
JavaScript
63 lines
2.5 KiB
JavaScript
import { animate } from ".";
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import { velocityPerSecond } from "../utils/velocity-per-second";
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import { getFrameData } from "framesync";
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export function inertia({ from = 0, velocity = 0, min, max, power = 0.8, timeConstant = 750, bounceStiffness = 500, bounceDamping = 10, restDelta = 1, modifyTarget, driver, onUpdate, onComplete, onStop, }) {
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let currentAnimation;
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function isOutOfBounds(v) {
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return (min !== undefined && v < min) || (max !== undefined && v > max);
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}
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function boundaryNearest(v) {
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if (min === undefined)
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return max;
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if (max === undefined)
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return min;
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return Math.abs(min - v) < Math.abs(max - v) ? min : max;
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}
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function startAnimation(options) {
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currentAnimation === null || currentAnimation === void 0 ? void 0 : currentAnimation.stop();
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currentAnimation = animate(Object.assign(Object.assign({}, options), { driver, onUpdate: (v) => {
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var _a;
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onUpdate === null || onUpdate === void 0 ? void 0 : onUpdate(v);
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(_a = options.onUpdate) === null || _a === void 0 ? void 0 : _a.call(options, v);
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}, onComplete,
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onStop }));
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}
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function startSpring(options) {
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startAnimation(Object.assign({ type: "spring", stiffness: bounceStiffness, damping: bounceDamping, restDelta }, options));
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}
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if (isOutOfBounds(from)) {
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startSpring({ from, velocity, to: boundaryNearest(from) });
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}
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else {
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let target = power * velocity + from;
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if (typeof modifyTarget !== "undefined")
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target = modifyTarget(target);
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const boundary = boundaryNearest(target);
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const heading = boundary === min ? -1 : 1;
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let prev;
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let current;
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const checkBoundary = (v) => {
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prev = current;
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current = v;
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velocity = velocityPerSecond(v - prev, getFrameData().delta);
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if ((heading === 1 && v > boundary) ||
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(heading === -1 && v < boundary)) {
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startSpring({ from: v, to: boundary, velocity });
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}
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};
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startAnimation({
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type: "decay",
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from,
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velocity,
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timeConstant,
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power,
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restDelta,
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modifyTarget,
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onUpdate: isOutOfBounds(target) ? checkBoundary : undefined,
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});
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}
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return {
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stop: () => currentAnimation === null || currentAnimation === void 0 ? void 0 : currentAnimation.stop(),
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};
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}
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//# sourceMappingURL=inertia.js.map
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