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

More powerful alternative to Animated library for React Native.

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

function initSensorData(sensorType) {
  if (sensorType === SensorType.ROTATION) {
    return makeMutable({
      qw: 0,
      qx: 0,
      qy: 0,
      qz: 0,
      yaw: 0,
      pitch: 0,
      roll: 0,
      interfaceOrientation: 0
    });
  } else {
    return makeMutable({
      x: 0,
      y: 0,
      z: 0,
      interfaceOrientation: 0
    });
  }
} // 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 ref = useRef({
    sensor: initSensorData(sensorType),
    unregister: () => {// NOOP
    },
    isAvailable: false,
    config: {
      interval: 0,
      adjustToInterfaceOrientation: true,
      iosReferenceFrame: IOSReferenceFrame.Auto
    }
  });
  useEffect(() => {
    ref.current.config = {
      interval: 'auto',
      adjustToInterfaceOrientation: true,
      iosReferenceFrame: IOSReferenceFrame.Auto,
      ...userConfig
    };
    const sensorData = ref.current.sensor;
    const id = registerSensor(sensorType, ref.current.config.interval === 'auto' ? -1 : ref.current.config.interval, ref.current.config.iosReferenceFrame, data => {
      'worklet';

      if (ref.current.config.adjustToInterfaceOrientation) {
        if (sensorType === SensorType.ROTATION) {
          data = adjustRotationToInterfaceOrientation(data);
        } else {
          data = adjustVectorToInterfaceOrientation(data);
        }
      }

      sensorData.value = data;
      flushImmediates();
    });

    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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