index.js

/* global AFRAME THREE */

if (typeof AFRAME === 'undefined') {
  throw new Error('Component attempted to register before AFRAME was available.');
}

var radToDeg = THREE.Math.radToDeg;

/**
 * Example component for A-Frame.
 */
AFRAME.registerComponent('orbit-controls', {
  dependencies: ['position', 'rotation'],
  schema: {
    enabled: {
      default: true
    },
    target: {
      default: ''
    },
    distance: {
      default: 1
    },
    enableRotate: {
      default: true
    },
    rotateSpeed: {
      default: 1.0
    },
    enableZoom: {
      default: true
    },
    zoomSpeed: {
      default: 1.0
    },
    enablePan: {
      default: true
    },
    keyPanSpeed: {
      default: 7.0
    },
    enableDamping: {
      default: false
    },
    dampingFactor: {
      default: 0.25
    },
    autoRotate: {
      default: false
    },
    autoRotateSpeed: {
      default: 2.0
    },
    enableKeys: {
      default: true
    },
    minAzimuthAngle: {
      default: -Infinity
    },
    maxAzimuthAngle: {
      default: Infinity
    },
    minPolarAngle: {
      default: 0
    },
    maxPolarAngle: {
      default: Math.PI
    },
    minZoom: {
      default: 0
    },
    maxZoom: {
      default: Infinity
    },
    invertZoom: {
      default: false
    },
    minDistance: {
      default: 0
    },
    maxDistance: {
      default: Infinity
    },
    rotateTo: {
      type: 'vec3',
      default: {x: 0, y: 0, z: 0}
    },
    rotateToSpeed: {
      type: 'number',
      default: 0.05
    },
    logPosition: {
      type: 'boolean',
      default: false
    },
    autoVRLookCam: {
      type: 'boolean',
      default: true
    }
  },

  /**
   * Set if component needs multiple instancing.
   */
  multiple: false,

  /**
   * Called once when component is attached. Generally for initial setup.
   */
  init: function () {
    this.sceneEl = this.el.sceneEl;
    this.object = this.el.object3D;
    this.target = this.sceneEl.querySelector(this.data.target).object3D.position;

    // console.log('enabled: ', this.data.enabled);
    this.endFlag = false;
    this.startFlag = false;

    // Find the look-controls component on this camera, or create if it doesn't exist.
    this.isRunning = false;
    this.lookControls = null;

    if (this.data.autoVRLookCam) {
      if (this.el.components['look-controls']) {
        this.lookControls = this.el.components['look-controls'];
      } else {
        this.el.setAttribute('look-controls', '');
        this.lookControls = this.el.components['look-controls'];
      }
      this.lookControls.pause();
      this.el.sceneEl.addEventListener('enter-vr', this.onEnterVR.bind(this), false);
      this.el.sceneEl.addEventListener('exit-vr', this.onExitVR.bind(this), false);
    }

    this.dolly = new THREE.Object3D();
    this.dolly.position.copy(this.object.position);

    this.savedPose = null;

    this.STATE = {
      NONE: -1,
      ROTATE: 0,
      DOLLY: 1,
      PAN: 2,
      TOUCH_ROTATE: 3,
      TOUCH_DOLLY: 4,
      TOUCH_PAN: 5,
      ROTATE_TO: 6
    };

    this.state = this.STATE.NONE;

    this.EPS = 0.000001;
    this.lastPosition = new THREE.Vector3();
    this.lastQuaternion = new THREE.Quaternion();

    this.spherical = new THREE.Spherical();
    this.sphericalDelta = new THREE.Spherical();

    this.scale = 1.0;
    this.zoomChanged = false;

    this.rotateStart = new THREE.Vector2();
    this.rotateEnd = new THREE.Vector2();
    this.rotateDelta = new THREE.Vector2();

    this.panStart = new THREE.Vector2();
    this.panEnd = new THREE.Vector2();
    this.panDelta = new THREE.Vector2();
    this.panOffset = new THREE.Vector3();

    this.dollyStart = new THREE.Vector2();
    this.dollyEnd = new THREE.Vector2();
    this.dollyDelta = new THREE.Vector2();

    this.vector = new THREE.Vector3();
    this.desiredPosition = new THREE.Vector3();

    this.mouseButtons = {
      ORBIT: THREE.MOUSE.LEFT,
      ZOOM: THREE.MOUSE.MIDDLE,
      PAN: THREE.MOUSE.RIGHT
    };

    this.keys = {
      LEFT: 37,
      UP: 38,
      RIGHT: 39,
      BOTTOM: 40
    };

    this.bindMethods();
  },

  /**
   * Called when component is attached and when component data changes.
   * Generally modifies the entity based on the data.
   */
  update: function (oldData) {
    // console.log('component update');

    if (this.data.rotateTo) {
      var rotateToVec3 = new THREE.Vector3(this.data.rotateTo.x, this.data.rotateTo.y, this.data.rotateTo.z);
      // Check if rotateToVec3 is already desiredPosition
      if (!this.desiredPosition.equals(rotateToVec3)) {
        this.desiredPosition.copy(rotateToVec3);
        this.rotateTo(this.desiredPosition);
      }
    }

    this.dolly.position.copy(this.object.position);
    this.updateView(true);
  },

  /**
   * Called when a component is removed (e.g., via removeAttribute).
   * Generally undoes all modifications to the entity.
   */
  remove: function () {
    // console.log("component remove");
    this.isRunning = false;
    this.removeEventListeners();
    this.el.sceneEl.removeEventListener('enter-vr', this.onEnterVR, false);
    this.el.sceneEl.removeEventListener('exit-vr', this.onExitVR, false);
  },

  /**
   * Called on each scene tick.
   */
  tick: function (t) {
    var render = this.data.enabled && this.isRunning ? this.updateView() : false;
    if (render === true && this.data.logPosition === true) {
      console.log(this.el.object3D.position);
    }
  },

  /*
   * Called when entering VR mode
  */
  onEnterVR: function (event) {
    // console.log('enter vr', this);

    this.saveCameraPose();

    // this.el.setAttribute('position', {x: 0, y: 2, z: 5});
    this.el.setAttribute('rotation', {x: 0, y: 0, z: 0});

    this.pause();
    this.lookControls.play();
    if (this.data.autoRotate) console.warn('orbit-controls: Sorry, autoRotate is not implemented in VR mode');
  },

  /*
   * Called when exiting VR mode
  */
  onExitVR: function (event) {
    // console.log('exit vr');

    this.lookControls.pause();
    this.play();

    this.restoreCameraPose();
    this.updateView(true);
  },

  /**
   * Called when entity pauses.
   * Use to stop or remove any dynamic or background behavior such as events.
   */
  pause: function () {
    // console.log("component pause");
    this.isRunning = false;
    this.removeEventListeners();
  },

  /**
   * Called when entity resumes.
   * Use to continue or add any dynamic or background behavior such as events.
   */
  play: function () {
    // console.log("component play");
    this.isRunning = true;

    var camera, cameraType;
    this.object.traverse(function (child) {
      if (child instanceof THREE.PerspectiveCamera) {
        camera = child;
        cameraType = 'PerspectiveCamera';
      } else if (child instanceof THREE.OrthographicCamera) {
        camera = child;
        cameraType = 'OrthographicCamera';
      }
    });

    this.camera = camera;
    this.cameraType = cameraType;

    this.sceneEl.addEventListener('renderstart', this.onRenderTargetLoaded, false);

    if (this.lookControls) this.lookControls.pause();
    if (this.canvasEl) this.addEventListeners();
  },

  /*
   * Called when Render Target is completely loaded
   * Then set canvasEl and add event listeners
   */
  onRenderTargetLoaded: function () {
    this.sceneEl.removeEventListener('renderstart', this.onRenderTargetLoaded, false);
    this.canvasEl = this.sceneEl.canvas;
    this.addEventListeners();
  },

  /*
   * Bind this to all event handlera
   */
  bindMethods: function () {
    this.onRenderTargetLoaded = this.onRenderTargetLoaded.bind(this);

    this.onContextMenu = this.onContextMenu.bind(this);
    this.onMouseDown = this.onMouseDown.bind(this);
    this.onMouseWheel = this.onMouseWheel.bind(this);
    this.onMouseMove = this.onMouseMove.bind(this);
    this.onMouseUp = this.onMouseUp.bind(this);
    this.onTouchStart = this.onTouchStart.bind(this);
    this.onTouchMove = this.onTouchMove.bind(this);
    this.onTouchEnd = this.onTouchEnd.bind(this);
    this.onKeyDown = this.onKeyDown.bind(this);
  },

  /*
   * Add event listeners
   */
  addEventListeners: function () {
    this.canvasEl.addEventListener('contextmenu', this.onContextMenu, false);

    this.canvasEl.addEventListener('mousedown', this.onMouseDown, false);
    this.canvasEl.addEventListener('mousewheel', this.onMouseWheel, false);
    this.canvasEl.addEventListener('MozMousePixelScroll', this.onMouseWheel, false); // firefox

    this.canvasEl.addEventListener('touchstart', this.onTouchStart, false);
    this.canvasEl.addEventListener('touchend', this.onTouchEnd, false);
    this.canvasEl.addEventListener('touchmove', this.onTouchMove, false);

    window.addEventListener('keydown', this.onKeyDown, false);
  },

  /*
   * Remove event listeners
   */
  removeEventListeners: function () {
    if (this.canvasEl) {
      this.canvasEl.removeEventListener('contextmenu', this.onContextMenu, false);
      this.canvasEl.removeEventListener('mousedown', this.onMouseDown, false);
      this.canvasEl.removeEventListener('mousewheel', this.onMouseWheel, false);
      this.canvasEl.removeEventListener('MozMousePixelScroll', this.onMouseWheel, false); // firefox

      this.canvasEl.removeEventListener('touchstart', this.onTouchStart, false);
      this.canvasEl.removeEventListener('touchend', this.onTouchEnd, false);
      this.canvasEl.removeEventListener('touchmove', this.onTouchMove, false);

      this.canvasEl.removeEventListener('mousemove', this.onMouseMove, false);
      this.canvasEl.removeEventListener('mouseup', this.onMouseUp, false);
      this.canvasEl.removeEventListener('mouseout', this.onMouseUp, false);
    }

    window.removeEventListener('keydown', this.onKeyDown, false);
  },

  /*
   * EVENT LISTENERS
   */

  /*
   * Called when right clicking the A-Frame component
   */

  onContextMenu: function (event) {
    event.preventDefault();
  },

  /*
   * MOUSE CLICK EVENT LISTENERS
   */

  onMouseDown: function (event) {
    // console.log('onMouseDown');

    if (!this.data.enabled || !this.isRunning) return;

    if (event.button === this.mouseButtons.ORBIT && (event.shiftKey || event.ctrlKey)) {
      if (this.data.enablePan === false) return;
      this.handleMouseDownPan(event);
      this.state = this.STATE.PAN;
    } else if (event.button === this.mouseButtons.ORBIT) {
      this.panOffset.set(0, 0, 0);
      if (this.data.enableRotate === false) return;
      this.handleMouseDownRotate(event);
      this.state = this.STATE.ROTATE;
    } else if (event.button === this.mouseButtons.ZOOM) {
      this.panOffset.set(0, 0, 0);
      if (this.data.enableZoom === false) return;
      this.handleMouseDownDolly(event);
      this.state = this.STATE.DOLLY;
    } else if (event.button === this.mouseButtons.PAN) {
      if (this.data.enablePan === false) return;
      this.handleMouseDownPan(event);
      this.state = this.STATE.PAN;
    }

    if (this.state !== this.STATE.NONE) {
      this.canvasEl.addEventListener('mousemove', this.onMouseMove, false);
      this.canvasEl.addEventListener('mouseup', this.onMouseUp, false);
      this.canvasEl.addEventListener('mouseout', this.onMouseUp, false);

      this.el.emit('start-drag-orbit-controls', null, false);
    }
  },

  onMouseMove: function (event) {
    // console.log('onMouseMove');

    if (!this.data.enabled || !this.isRunning) return;

    event.preventDefault();

    if (this.state === this.STATE.ROTATE) {
      if (this.data.enableRotate === false) return;
      this.handleMouseMoveRotate(event);
    } else if (this.state === this.STATE.DOLLY) {
      if (this.data.enableZoom === false) return;
      this.handleMouseMoveDolly(event);
    } else if (this.state === this.STATE.PAN) {
      if (this.data.enablePan === false) return;
      this.handleMouseMovePan(event);
    }
  },

  onMouseUp: function (event) {
    // console.log('onMouseUp');

    if (!this.data.enabled || !this.isRunning) return;

    if (this.state === this.STATE.ROTATE_TO) return;

    event.preventDefault();
    event.stopPropagation();

    this.handleMouseUp(event);

    this.canvasEl.removeEventListener('mousemove', this.onMouseMove, false);
    this.canvasEl.removeEventListener('mouseup', this.onMouseUp, false);
    this.canvasEl.removeEventListener('mouseout', this.onMouseUp, false);

    this.state = this.STATE.NONE;

    this.startFlag = true;
  },

  /*
   * MOUSE WHEEL EVENT LISTENERS
   */

  onMouseWheel: function (event) {
    // console.log('onMouseWheel');

    if (!this.data.enabled || !this.isRunning || this.data.enableZoom === false || (this.state !== this.STATE.NONE && this.state !== this.STATE.ROTATE)) return;

    event.preventDefault();
    event.stopPropagation();
    this.handleMouseWheel(event);
  },

  /*
   * TOUCH EVENT LISTENERS
   */

  onTouchStart: function (event) {
    // console.log('onTouchStart');

    if (!this.data.enabled || !this.isRunning) return;

    switch (event.touches.length) {
      case 1: // one-fingered touch: rotate
        if (this.data.enableRotate === false) return;
        this.handleTouchStartRotate(event);
        this.state = this.STATE.TOUCH_ROTATE;
        break;
      case 2: // two-fingered touch: dolly
        if (this.data.enableZoom === false) return;
        this.handleTouchStartDolly(event);
        this.state = this.STATE.TOUCH_DOLLY;
        break;
      case 3: // three-fingered touch: pan
        if (this.data.enablePan === false) return;
        this.handleTouchStartPan(event);
        this.state = this.STATE.TOUCH_PAN;
        break;
      default:
        this.state = this.STATE.NONE;
    }

    if (this.state !== this.STATE.NONE) {
      this.el.emit('start-drag-orbit-controls', null, false);
    }
  },

  onTouchMove: function (event) {
    // console.log('onTouchMove');

    if (!this.data.enabled || !this.isRunning) return;

    event.preventDefault();
    event.stopPropagation();

    switch (event.touches.length) {
      case 1: // one-fingered touch: rotate
        if (this.enableRotate === false) return;
        if (this.state !== this.STATE.TOUCH_ROTATE) return; // is this needed?...
        this.handleTouchMoveRotate(event);
        break;

      case 2: // two-fingered touch: dolly
        if (this.data.enableZoom === false) return;
        if (this.state !== this.STATE.TOUCH_DOLLY) return; // is this needed?...
        this.handleTouchMoveDolly(event);
        break;

      case 3: // three-fingered touch: pan
        if (this.data.enablePan === false) return;
        if (this.state !== this.STATE.TOUCH_PAN) return; // is this needed?...
        this.handleTouchMovePan(event);
        break;

      default:
        this.state = this.STATE.NONE;
    }
  },

  onTouchEnd: function (event) {
    // console.log('onTouchEnd');

    if (!this.data.enabled || !this.isRunning) return;

    this.handleTouchEnd(event);

    this.el.emit('end-drag-orbit-controls', null, false);

    this.state = this.STATE.NONE;
  },

  /*
   * KEYBOARD EVENT LISTENERS
   */

  onKeyDown: function (event) {
    // console.log('onKeyDown');

    if (!this.data.enabled || !this.isRunning || this.data.enableKeys === false || this.data.enablePan === false) return;

    this.handleKeyDown(event);
  },

  /*
   * EVENT HANDLERS
   */

  /*
   * MOUSE CLICK EVENT HANDLERS
   */

  handleMouseDownRotate: function (event) {
    // console.log( 'handleMouseDownRotate' );
    this.rotateStart.set(event.clientX, event.clientY);
  },

  handleMouseDownDolly: function (event) {
    // console.log( 'handleMouseDownDolly' );
    this.dollyStart.set(event.clientX, event.clientY);
  },

  handleMouseDownPan: function (event) {
    // console.log( 'handleMouseDownPan' );
    this.panStart.set(event.clientX, event.clientY);
  },

  handleMouseMoveRotate: function (event) {
    // console.log( 'handleMouseMoveRotate' );

    this.rotateEnd.set(event.clientX, event.clientY);
    this.rotateDelta.subVectors(this.rotateEnd, this.rotateStart);

    var canvas = this.canvasEl === document ? this.canvasEl.body : this.canvasEl;

    // rotating across whole screen goes 360 degrees around
    this.rotateLeft(2 * Math.PI * this.rotateDelta.x / canvas.clientWidth * this.data.rotateSpeed);

    // rotating up and down along whole screen attempts to go 360, but limited to 180
    this.rotateUp(2 * Math.PI * this.rotateDelta.y / canvas.clientHeight * this.data.rotateSpeed);

    this.rotateStart.copy(this.rotateEnd);

    this.updateView();
  },

  handleMouseMoveDolly: function (event) {
    // console.log( 'handleMouseMoveDolly' );

    this.dollyEnd.set(event.clientX, event.clientY);
    this.dollyDelta.subVectors(this.dollyEnd, this.dollyStart);

    if (this.dollyDelta.y > 0) {
      !this.data.invertZoom ? this.dollyIn(this.getZoomScale()) : this.dollyOut(this.getZoomScale());
    } else if (this.dollyDelta.y < 0) {
      !this.data.invertZoom ? this.dollyOut(this.getZoomScale()) : this.dollyIn(this.getZoomScale());
    }

    this.dollyStart.copy(this.dollyEnd);

    this.updateView();
  },

  handleMouseMovePan: function (event) {
    // console.log( 'handleMouseMovePan' );

    this.panEnd.set(event.clientX, event.clientY);
    this.panDelta.subVectors(this.panEnd, this.panStart);
    this.pan(this.panDelta.x, this.panDelta.y);
    this.panStart.copy(this.panEnd);

    this.updateView();
  },

  handleMouseUp: function (event) {
    // console.log( 'handleMouseUp' );
  },

  /*
   * MOUSE WHEEL EVENT HANDLERS
   */

  handleMouseWheel: function (event) {
    // console.log( 'handleMouseWheel' );

    var delta = 0;
    if (event.wheelDelta !== undefined) {
      // WebKit / Opera / Explorer 9
      delta = event.wheelDelta;
    } else if (event.detail !== undefined) {
      // Firefox
      delta = -event.detail;
    }

    if (delta > 0) {
      !this.data.invertZoom ? this.dollyOut(this.getZoomScale()) : this.dollyIn(this.getZoomScale());
    } else if (delta < 0) {
      !this.data.invertZoom ? this.dollyIn(this.getZoomScale()) : this.dollyOut(this.getZoomScale());
    }

    this.updateView();
  },

  /*
   * TOUCH EVENT HANDLERS
   */

  handleTouchStartRotate: function (event) {
    // console.log( 'handleTouchStartRotate' );

    this.rotateStart.set(event.touches[0].pageX, event.touches[0].pageY);
  },

  handleTouchStartDolly: function (event) {
    // console.log( 'handleTouchStartDolly' );

    var dx = event.touches[0].pageX - event.touches[1].pageX;
    var dy = event.touches[0].pageY - event.touches[1].pageY;
    var distance = Math.sqrt(dx * dx + dy * dy);
    this.dollyStart.set(0, distance);
  },

  handleTouchStartPan: function (event) {
    // console.log( 'handleTouchStartPan' );

    this.panStart.set(event.touches[0].pageX, event.touches[0].pageY);
  },

  handleTouchMoveRotate: function (event) {
    // console.log( 'handleTouchMoveRotate' );

    this.rotateEnd.set(event.touches[0].pageX, event.touches[0].pageY);
    this.rotateDelta.subVectors(this.rotateEnd, this.rotateStart);

    var canvas = this.canvasEl === document ? this.canvasEl.body : this.canvasEl;
    // rotating across whole screen goes 360 degrees around
    this.rotateLeft(2 * Math.PI * this.rotateDelta.x / canvas.clientWidth * this.data.rotateSpeed);
    // rotating up and down along whole screen attempts to go 360, but limited to 180
    this.rotateUp(2 * Math.PI * this.rotateDelta.y / canvas.clientHeight * this.data.rotateSpeed);
    this.rotateStart.copy(this.rotateEnd);
    this.updateView();
  },

  handleTouchMoveDolly: function (event) {
    // console.log( 'handleTouchMoveDolly' );

    var dx = event.touches[0].pageX - event.touches[1].pageX;
    var dy = event.touches[0].pageY - event.touches[1].pageY;

    var distance = Math.sqrt(dx * dx + dy * dy);

    this.dollyEnd.set(0, distance);
    this.dollyDelta.subVectors(this.dollyEnd, this.dollyStart);
    if (this.dollyDelta.y > 0) {
      this.dollyIn(this.getZoomScale());
    } else if (this.dollyDelta.y < 0) {
      this.dollyOut(this.getZoomScale());
    }

    this.dollyStart.copy(this.dollyEnd);
    this.updateView();
  },

  handleTouchMovePan: function (event) {
    // console.log( 'handleTouchMovePan' );

    this.panEnd.set(event.touches[0].pageX, event.touches[0].pageY);
    this.panDelta.subVectors(this.panEnd, this.panStart);
    this.pan(this.panDelta.x, this.panDelta.y);
    this.panStart.copy(this.panEnd);
    this.updateView();
  },

  handleTouchEnd: function (event) {
    // console.log( 'handleTouchEnd' );
  },

  /*
   * KEYBOARD EVENT HANDLERS
   */

  handleKeyDown: function (event) {
    // console.log( 'handleKeyDown' );

    switch (event.keyCode) {
      case this.keys.UP:
        this.pan(0, this.data.keyPanSpeed);
        this.updateView();
        break;
      case this.keys.BOTTOM:
        this.pan(0, -this.data.keyPanSpeed);
        this.updateView();
        break;
      case this.keys.LEFT:
        this.pan(this.data.keyPanSpeed, 0);
        this.updateView();
        break;
      case this.keys.RIGHT:
        this.pan(-this.data.keyPanSpeed, 0);
        this.updateView();
        break;
    }
  },

  /*
   * HELPER FUNCTIONS
   */

  getAutoRotationAngle: function () {
    return 2 * Math.PI / 60 / 60 * this.data.autoRotateSpeed;
  },

  getZoomScale: function () {
    return Math.pow(0.95, this.data.zoomSpeed);
  },

  rotateLeft: function (angle) {
    this.sphericalDelta.theta -= angle;
  },

  rotateUp: function (angle) {
    this.sphericalDelta.phi -= angle;
  },

  rotateTo: function (vec3) {
    this.state = this.STATE.ROTATE_TO;
    this.desiredPosition.copy(vec3);
  },

  panHorizontally: function (distance, objectMatrix) {
    // console.log('pan horizontally', distance, objectMatrix);
    var v = new THREE.Vector3();
    v.setFromMatrixColumn(objectMatrix, 0); // get X column of objectMatrix
    v.multiplyScalar(-distance);
    this.panOffset.add(v);
  },

  panVertically: function (distance, objectMatrix) {
    // console.log('pan vertically', distance, objectMatrix);
    var v = new THREE.Vector3();
    v.setFromMatrixColumn(objectMatrix, 1); // get Y column of objectMatrix
    v.multiplyScalar(distance);
    this.panOffset.add(v);
  },

  pan: function (deltaX, deltaY) { // deltaX and deltaY are in pixels; right and down are positive
    // console.log('panning', deltaX, deltaY );
    var offset = new THREE.Vector3();
    var canvas = this.canvasEl === document ? this.canvasEl.body : this.canvasEl;

    if (this.cameraType === 'PerspectiveCamera') {
      // perspective
      var position = this.dolly.position;
      offset.copy(position).sub(this.target);
      var targetDistance = offset.length();
      targetDistance *= Math.tan((this.camera.fov / 2) * Math.PI / 180.0); // half of the fov is center to top of screen
      this.panHorizontally(2 * deltaX * targetDistance / canvas.clientHeight, this.object.matrix); // we actually don't use screenWidth, since perspective camera is fixed to screen height
      this.panVertically(2 * deltaY * targetDistance / canvas.clientHeight, this.object.matrix);
    } else if (this.cameraType === 'OrthographicCamera') {
      // orthographic
      this.panHorizontally(deltaX * (this.dolly.right - this.dolly.left) / this.camera.zoom / canvas.clientWidth, this.object.matrix);
      this.panVertically(deltaY * (this.dolly.top - this.dolly.bottom) / this.camera.zoom / canvas.clientHeight, this.object.matrix);
    } else {
      // camera neither orthographic nor perspective
      console.warn('Trying to pan: WARNING: Orbit Controls encountered an unknown camera type - pan disabled.');
      this.data.enablePan = false;
    }
  },

  dollyIn: function (dollyScale) {
    // console.log( "dollyIn camera" );
    if (this.cameraType === 'PerspectiveCamera') {
      this.scale *= dollyScale;
    } else if (this.cameraType === 'OrthographicCamera') {
      this.camera.zoom = Math.max(this.data.minZoom, Math.min(this.data.maxZoom, this.camera.zoom * dollyScale));
      this.camera.updateProjectionMatrix();
      this.zoomChanged = true;
    } else {
      console.warn('Trying to dolly in: WARNING: Orbit Controls encountered an unknown camera type - dolly/zoom disabled.');
      this.data.enableZoom = false;
    }
  },

  dollyOut: function (dollyScale) {
    // console.log( "dollyOut camera" );
    if (this.cameraType === 'PerspectiveCamera') {
      this.scale /= dollyScale;
    } else if (this.cameraType === 'OrthographicCamera') {
      this.camera.zoom = Math.max(this.data.minZoom, Math.min(this.data.maxZoom, this.camera.zoom / dollyScale));
      this.camera.updateProjectionMatrix();
      this.zoomChanged = true;
    } else {
      console.warn('Trying to dolly out: WARNING: Orbit Controls encountered an unknown camera type - dolly/zoom disabled.');
      this.data.enableZoom = false;
    }
  },

  lookAtTarget: function (object, target) {
    var v = new THREE.Vector3();
    v.subVectors(object.position, target).add(object.position);
    object.lookAt(v);
  },

  /*
   * SAVES CAMERA POSE (WHEN ENTERING VR)
   */

  saveCameraPose: function () {
    if (this.savedPose) { return; }
    this.savedPose = {
      position: this.dolly.position,
      rotation: this.dolly.rotation
    };
  },

  /*
   * RESTORE CAMERA POSE (WHEN EXITING VR)
   */

  restoreCameraPose: function () {
    if (!this.savedPose) { return; }
    this.dolly.position.copy(this.savedPose.position);
    this.dolly.rotation.copy(this.savedPose.rotation);
    this.savedPose = null;
  },

  /*
   * VIEW UPDATE
   */

  updateView: function (forceUpdate) {
    if (this.desiredPosition && this.state === this.STATE.ROTATE_TO) {
      var desiredSpherical = new THREE.Spherical();
      desiredSpherical.setFromVector3(this.desiredPosition);
      var phiDiff = desiredSpherical.phi - this.spherical.phi;
      var thetaDiff = desiredSpherical.theta - this.spherical.theta;
      this.sphericalDelta.set(this.spherical.radius, phiDiff * this.data.rotateToSpeed, thetaDiff * this.data.rotateToSpeed);
    }
    //  console.log("updating");
    var offset = new THREE.Vector3();

    var quat = new THREE.Quaternion().setFromUnitVectors(this.dolly.up, new THREE.Vector3(0, 1, 0)); // so camera.up is the orbit axis
    var quatInverse = quat.clone().inverse();

    offset.copy(this.dolly.position).sub(this.target);
    offset.applyQuaternion(quat); // rotate offset to "y-axis-is-up" space
    this.spherical.setFromVector3(offset); // angle from z-axis around y-axis

    if (this.data.autoRotate && this.state === this.STATE.NONE) this.rotateLeft(this.getAutoRotationAngle());

    this.spherical.theta += this.sphericalDelta.theta;
    this.spherical.phi += this.sphericalDelta.phi;
    this.spherical.theta = Math.max(this.data.minAzimuthAngle, Math.min(this.data.maxAzimuthAngle, this.spherical.theta)); // restrict theta to be inside desired limits
    this.spherical.phi = Math.max(this.data.minPolarAngle, Math.min(this.data.maxPolarAngle, this.spherical.phi)); // restrict phi to be inside desired limits
    this.spherical.makeSafe();
    this.spherical.radius *= this.scale;
    this.spherical.radius = Math.max(this.data.minDistance, Math.min(this.data.maxDistance, this.spherical.radius)); // restrict radius to be inside desired limits

    this.target.add(this.panOffset); // move target to panned location

    offset.setFromSpherical(this.spherical);
    offset.applyQuaternion(quatInverse); // rotate offset back to "camera-up-vector-is-up" space

    this.dolly.position.copy(this.target).add(offset);

    if (this.target) {
      this.lookAtTarget(this.dolly, this.target);
    }

    if (this.data.enableDamping === true) {
      this.sphericalDelta.theta *= (1 - this.data.dampingFactor);
      this.sphericalDelta.phi *= (1 - this.data.dampingFactor);
      //   console.log(this.sphericalDelta);
    } else {
      this.sphericalDelta.set(0, 0, 0);
    }

    this.scale = 1;
    this.panOffset.set(0, 0, 0);

    // update condition is:
    // min(camera displacement, camera rotation in radians)^2 > EPS
    // using small-angle approximation cos(x/2) = 1 - x^2 / 8

    this.endFlag = true;

    if (forceUpdate === true ||
      this.zoomChanged ||
      this.lastPosition.distanceToSquared(this.dolly.position) > this.EPS ||
      8 * (1 - this.lastQuaternion.dot(this.dolly.quaternion)) > this.EPS) {
      // this.el.emit('change-drag-orbit-controls', null, false);
      //   console.log("updating");
      var hmdQuaternion = this.calculateHMDQuaternion();
      var hmdEuler = new THREE.Euler();
      hmdEuler.setFromQuaternion(hmdQuaternion, 'YXZ');

      this.el.setAttribute('position', {
        x: this.dolly.position.x,
        y: this.dolly.position.y,
        z: this.dolly.position.z
      });

      this.el.setAttribute('rotation', {
        x: radToDeg(hmdEuler.x),
        y: radToDeg(hmdEuler.y),
        z: radToDeg(hmdEuler.z)
      });

      this.endFlag = false;

      this.lastPosition.copy(this.dolly.position);
      this.lastQuaternion.copy(this.dolly.quaternion);

      this.zoomChanged = false;

      return true;
    }

    if (this.startFlag && this.endFlag) {
      this.startFlag = false;
      this.el.emit('end-drag-orbit-controls', null, false);
    }

    return false;
  },

  calculateHMDQuaternion: (function () {
    var hmdQuaternion = new THREE.Quaternion();
    return function () {
      hmdQuaternion.copy(this.dolly.quaternion);
      return hmdQuaternion;
    };
  })()

});