react-native-reanimated/lib/module/animation/decay/rigidDecay.js

More powerful alternative to Animated library for React Native.

'use strict';

import { SLOPE_FACTOR, VELOCITY_EPS } from "./utils.js";
export function rigidDecay(animation, now, config) {
  'worklet';

  const {
    lastTimestamp,
    startTimestamp,
    initialVelocity,
    current,
    velocity
  } = animation;
  const deltaTime = Math.min(now - lastTimestamp, 64);
  const v = velocity * Math.exp(-(1 - config.deceleration) * (now - startTimestamp) * SLOPE_FACTOR);
  animation.current = current + v * config.velocityFactor * deltaTime / 1000;
  animation.velocity = v;
  animation.lastTimestamp = now;
  if (config.clamp) {
    if (initialVelocity < 0 && animation.current <= config.clamp[0]) {
      animation.current = config.clamp[0];
      return true;
    } else if (initialVelocity > 0 && animation.current >= config.clamp[1]) {
      animation.current = config.clamp[1];
      return true;
    }
  }
  return Math.abs(v) < VELOCITY_EPS;
}
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