@kitware/vtk.js/Interaction/Misc/DeviceOrientationToCamera.js

Visualization Toolkit for the Web

const listeners = [];
const orientation = {
  device: {},
  screen: window.orientation || 0,
  supported: !!window.DeviceMotionEvent,
  update: false
};
const SCREEN_ORIENTATION_MAP = {
  'landscape-primary': 90,
  'landscape-secondary': -90,
  'portrait-secondary': 180,
  'portrait-primary': 0
};
function isEventValid(evt) {
  return Number.isFinite(evt.alpha);
}
function onDeviceOrientationChangeEvent(evt) {
  orientation.device = evt;
  if (!Number.isFinite(evt.alpha)) {
    orientation.supported = false;
  }
}
function onScreenOrientationChangeEvent() {
  orientation.screen = SCREEN_ORIENTATION_MAP[window.screen.orientation || window.screen.mozOrientation] || window.orientation || 0;
}
function addWindowListeners() {
  window.addEventListener('orientationchange', onScreenOrientationChangeEvent, false);
  window.addEventListener('deviceorientation', onDeviceOrientationChangeEvent, false);
  orientation.update = true;
  listeners.filter(i => !!i).forEach(i => i.renderWindowInteractor.requestAnimation(i));
}
function removeWindowListeners() {
  window.removeEventListener('orientationchange', onScreenOrientationChangeEvent, false);
  window.removeEventListener('deviceorientation', onDeviceOrientationChangeEvent, false);
  orientation.update = false;
  listeners.filter(i => !!i).forEach(i => i.renderWindowInteractor.cancelAnimation(i));
}
function addCameraToSynchronize(renderWindowInteractor, camera, onCameraUpdate) {
  function onAnimation() {
    if (orientation.update && isEventValid(orientation.device)) {
      const {
        alpha,
        beta,
        gamma
      } = orientation.device;
      const {
        screen
      } = orientation;
      camera.setDeviceAngles(alpha, beta, gamma, screen);
      if (onCameraUpdate) {
        onCameraUpdate();
      }
    }
  }
  const subscription = renderWindowInteractor.onAnimation(onAnimation);
  const listener = {
    subscription,
    renderWindowInteractor
  };
  const listenerId = listeners.length;
  listeners.push(listener);
  if (orientation.update) {
    listener.renderWindowInteractor.requestAnimation(listener);
  }
  return listenerId;
}
function removeCameraToSynchronize(id, cancelAnimation = true) {
  const listener = listeners[id];
  if (listener) {
    listener.subscription.unsubscribe();
    if (cancelAnimation) {
      listener.renderWindowInteractor.cancelAnimation(listener);
    }
  }
  listeners[id] = null;
}
function isDeviceOrientationSupported() {
  return orientation.supported;
}
var vtkDeviceOrientationToCamera = {
  addCameraToSynchronize,
  addWindowListeners,
  isDeviceOrientationSupported,
  removeCameraToSynchronize,
  removeWindowListeners
};

export { vtkDeviceOrientationToCamera as default };