react-native-reanimated/lib/module/reanimated2/hook/useAnimatedSensor.js

More powerful alternative to Animated library for React Native.

import { useEffect, useRef } from 'react';
import { initializeSensor, registerSensor, unregisterSensor } from '../core';
import { SensorType, IOSReferenceFrame } from '../commonTypes';
import { callMicrotasks } from '../threads';

// euler angles are in order ZXY, z = yaw, x = pitch, y = roll
// https://github.com/mrdoob/three.js/blob/dev/src/math/Quaternion.js#L237
function eulerToQuaternion(pitch, roll, yaw) {
  'worklet';

  const c1 = Math.cos(pitch / 2);
  const s1 = Math.sin(pitch / 2);
  const c2 = Math.cos(roll / 2);
  const s2 = Math.sin(roll / 2);
  const c3 = Math.cos(yaw / 2);
  const s3 = Math.sin(yaw / 2);
  return [s1 * c2 * c3 - c1 * s2 * s3, c1 * s2 * c3 + s1 * c2 * s3, c1 * c2 * s3 + s1 * s2 * c3, c1 * c2 * c3 - s1 * s2 * s3];
}
function adjustRotationToInterfaceOrientation(data) {
  'worklet';

  const {
    interfaceOrientation,
    pitch,
    roll,
    yaw
  } = data;
  if (interfaceOrientation === 90) {
    data.pitch = roll;
    data.roll = -pitch;
    data.yaw = yaw - Math.PI / 2;
  } else if (interfaceOrientation === 270) {
    data.pitch = -roll;
    data.roll = pitch;
    data.yaw = yaw + Math.PI / 2;
  } else if (interfaceOrientation === 180) {
    data.pitch *= -1;
    data.roll *= -1;
    data.yaw *= -1;
  }
  const q = eulerToQuaternion(data.pitch, data.roll, data.yaw);
  data.qx = q[0];
  data.qy = q[1];
  data.qz = q[2];
  data.qw = q[3];
  return data;
}
function adjustVectorToInterfaceOrientation(data) {
  'worklet';

  const {
    interfaceOrientation,
    x,
    y
  } = data;
  if (interfaceOrientation === 90) {
    data.x = -y;
    data.y = x;
  } else if (interfaceOrientation === 270) {
    data.x = y;
    data.y = -x;
  } else if (interfaceOrientation === 180) {
    data.x *= -1;
    data.y *= -1;
  }
  return data;
}
export function useAnimatedSensor(sensorType, userConfig) {
  const config = {
    interval: 'auto',
    adjustToInterfaceOrientation: true,
    iosReferenceFrame: IOSReferenceFrame.Auto,
    ...userConfig
  };
  const ref = useRef({
    sensor: initializeSensor(sensorType, config),
    unregister: () => {
      // NOOP
    },
    isAvailable: false,
    config: config
  });
  useEffect(() => {
    const newConfig = {
      ...config,
      ...userConfig
    };
    ref.current.sensor = initializeSensor(sensorType, newConfig);
    const sensorData = ref.current.sensor;
    const adjustToInterfaceOrientation = ref.current.config.adjustToInterfaceOrientation;
    const id = registerSensor(sensorType, config, data => {
      'worklet';

      if (adjustToInterfaceOrientation) {
        if (sensorType === SensorType.ROTATION) {
          data = adjustRotationToInterfaceOrientation(data);
        } else {
          data = adjustVectorToInterfaceOrientation(data);
        }
      }
      sensorData.value = data;
      callMicrotasks();
    });
    if (id !== -1) {
      // if sensor is available
      ref.current.unregister = () => unregisterSensor(id);
      ref.current.isAvailable = true;
    } else {
      // if sensor is unavailable
      ref.current.unregister = () => {
        // NOOP
      };
      ref.current.isAvailable = false;
    }
    return () => {
      ref.current.unregister();
    };
  }, [sensorType, userConfig]);
  return ref.current;
}
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