text: console.warn( "THREE.OrbitControls: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/index.html#manual/en/introduction/Import-via-modules." );
  /**
   * @author qiao / https://github.com/qiao
   * @author mrdoob / http://mrdoob.com
   * @author alteredq / http://alteredqualia.com/
   * @author WestLangley / http://github.com/WestLangley
   * @author erich666 / http://erichaines.com
   * @author ScieCode / http://github.com/sciecode
   */
  
  // This set of controls performs orbiting, dollying (zooming), and panning.
  // Unlike TrackballControls, it maintains the "up" direction object.up (+Y by default).
  //
  //    Orbit - left mouse / touch: one-finger move
  //    Zoom - middle mouse, or mousewheel / touch: two-finger spread or squish
  //    Pan - right mouse, or left mouse + ctrl/meta/shiftKey, or arrow keys / touch: two-finger move
  
  THREE.OrbitControls = function ( object, domElement ) {
  
    if ( domElement === undefined ) console.warn( 'THREE.OrbitControls: The second parameter "domElement" is now mandatory.' );
    if ( domElement === document ) console.error( 'THREE.OrbitControls: "document" should not be used as the target "domElement". Please use "renderer.domElement" instead.' );
  
    this.object = object;
    this.domElement = domElement;
  
    // Set to false to disable this control
    this.enabled = true;
  
    // "target" sets the location of focus, where the object orbits around
    this.target = new THREE.Vector3();
  
    // How far you can dolly in and out ( PerspectiveCamera only )
    this.minDistance = 0;
    this.maxDistance = Infinity;
  
    // How far you can zoom in and out ( OrthographicCamera only )
    this.minZoom = 0;
    this.maxZoom = Infinity;
  
    // How far you can orbit vertically, upper and lower limits.
    // Range is 0 to Math.PI radians.
    this.minPolarAngle = 0; // radians
    this.maxPolarAngle = Math.PI; // radians
  
    // How far you can orbit horizontally, upper and lower limits.
    // If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
    this.minAzimuthAngle = - Infinity; // radians
    this.maxAzimuthAngle = Infinity; // radians
  
    // Set to true to enable damping (inertia)
    // If damping is enabled, you must call controls.update() in your animation loop
    this.enableDamping = false;
    this.dampingFactor = 0.05;
  
    // This option actually enables dollying in and out; left as "zoom" for backwards compatibility.
    // Set to false to disable zooming
    this.enableZoom = true;
    this.zoomSpeed = 1.0;
  
    // Set to false to disable rotating
    this.enableRotate = true;
    this.rotateSpeed = 1.0;
  
    // Set to false to disable panning
    this.enablePan = true;
    this.panSpeed = 1.0;
    this.screenSpacePanning = false; // if true, pan in screen-space
    this.keyPanSpeed = 7.0;	// pixels moved per arrow key push
  
    // Set to true to automatically rotate around the target
    // If auto-rotate is enabled, you must call controls.update() in your animation loop
    this.autoRotate = false;
    this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60
  
    // Set to false to disable use of the keys
    this.enableKeys = true;
  
    // The four arrow keys
    this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };
  
    // Mouse buttons
    this.mouseButtons = { LEFT: THREE.MOUSE.ROTATE, MIDDLE: THREE.MOUSE.DOLLY, RIGHT: THREE.MOUSE.PAN };
  
    // Touch fingers
    this.touches = { ONE: THREE.TOUCH.ROTATE, TWO: THREE.TOUCH.DOLLY_PAN };
  
    // for reset
    this.target0 = this.target.clone();
    this.position0 = this.object.position.clone();
    this.zoom0 = this.object.zoom;
  
    //
    // public methods
    //
  
    this.getPolarAngle = function () {
  
      return spherical.phi;
  
    };
  
    this.getAzimuthalAngle = function () {
  
      return spherical.theta;
  
    };
  
    this.saveState = function () {
  
      scope.target0.copy( scope.target );
      scope.position0.copy( scope.object.position );
      scope.zoom0 = scope.object.zoom;
  
    };
  
    this.reset = function () {
  
      scope.target.copy( scope.target0 );
      scope.object.position.copy( scope.position0 );
      scope.object.zoom = scope.zoom0;
  
      scope.object.updateProjectionMatrix();
      scope.dispatchEvent( changeEvent );
  
      scope.update();
  
      state = STATE.NONE;
  
    };
  
    // this method is exposed, but perhaps it would be better if we can make it private...
    this.update = function () {
  
      var offset = new THREE.Vector3();
  
      // so camera.up is the orbit axis
      var quat = new THREE.Quaternion().setFromUnitVectors( object.up, new THREE.Vector3( 0, 1, 0 ) );
      var quatInverse = quat.clone().inverse();
  
      var lastPosition = new THREE.Vector3();
      var lastQuaternion = new THREE.Quaternion();
  
      return function update() {
  
        var position = scope.object.position;
  
        offset.copy( position ).sub( scope.target );
  
        // rotate offset to "y-axis-is-up" space
        offset.applyQuaternion( quat );
  
        // angle from z-axis around y-axis
        spherical.setFromVector3( offset );
  
        if ( scope.autoRotate && state === STATE.NONE ) {
  
          rotateLeft( getAutoRotationAngle() );
  
        }
  
        if ( scope.enableDamping ) {
  
          spherical.theta += sphericalDelta.theta * scope.dampingFactor;
          spherical.phi += sphericalDelta.phi * scope.dampingFactor;
  
        } else {
  
          spherical.theta += sphericalDelta.theta;
          spherical.phi += sphericalDelta.phi;
  
        }
  
        // restrict theta to be between desired limits
        spherical.theta = Math.max( scope.minAzimuthAngle, Math.min( scope.maxAzimuthAngle, spherical.theta ) );
  
        // restrict phi to be between desired limits
        spherical.phi = Math.max( scope.minPolarAngle, Math.min( scope.maxPolarAngle, spherical.phi ) );
  
        spherical.makeSafe();
  
  
        spherical.radius *= scale;
  
        // restrict radius to be between desired limits
        spherical.radius = Math.max( scope.minDistance, Math.min( scope.maxDistance, spherical.radius ) );
  
        // move target to panned location
  
        if ( scope.enableDamping === true ) {
  
          scope.target.addScaledVector( panOffset, scope.dampingFactor );
  
        } else {
  
          scope.target.add( panOffset );
  
        }
  
        offset.setFromSpherical( spherical );
  
        // rotate offset back to "camera-up-vector-is-up" space
        offset.applyQuaternion( quatInverse );
  
        position.copy( scope.target ).add( offset );
  
        scope.object.lookAt( scope.target );
  
        if ( scope.enableDamping === true ) {
  
          sphericalDelta.theta *= ( 1 - scope.dampingFactor );
          sphericalDelta.phi *= ( 1 - scope.dampingFactor );
  
          panOffset.multiplyScalar( 1 - scope.dampingFactor );
  
        } else {
  
          sphericalDelta.set( 0, 0, 0 );
  
          panOffset.set( 0, 0, 0 );
  
        }
  
        scale = 1;
  
        // update condition is:
        // min(camera displacement, camera rotation in radians)^2 > EPS
        // using small-angle approximation cos(x/2) = 1 - x^2 / 8
  
        if ( zoomChanged ||
          lastPosition.distanceToSquared( scope.object.position ) > EPS ||
          8 * ( 1 - lastQuaternion.dot( scope.object.quaternion ) ) > EPS ) {
  
          scope.dispatchEvent( changeEvent );
  
          lastPosition.copy( scope.object.position );
          lastQuaternion.copy( scope.object.quaternion );
          zoomChanged = false;
  
          return true;
  
        }
  
        return false;
  
      };
  
    }();
  
    this.dispose = function () {
  
      scope.domElement.removeEventListener( 'contextmenu', onContextMenu, false );
      scope.domElement.removeEventListener( 'mousedown', onMouseDown, false );
      scope.domElement.removeEventListener( 'wheel', onMouseWheel, false );
  
      scope.domElement.removeEventListener( 'touchstart', onTouchStart, false );
      scope.domElement.removeEventListener( 'touchend', onTouchEnd, false );
      scope.domElement.removeEventListener( 'touchmove', onTouchMove, false );
  
      document.removeEventListener( 'mousemove', onMouseMove, false );
      document.removeEventListener( 'mouseup', onMouseUp, false );
  
      scope.domElement.removeEventListener( 'keydown', onKeyDown, false );
  
      //scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?
  
    };
  
    //
    // internals
    //
  
    var scope = this;
  
    var changeEvent = { type: 'change' };
    var startEvent = { type: 'start' };
    var endEvent = { type: 'end' };
  
    var STATE = {
      NONE: - 1,
      ROTATE: 0,
      DOLLY: 1,
      PAN: 2,
      TOUCH_ROTATE: 3,
      TOUCH_PAN: 4,
      TOUCH_DOLLY_PAN: 5,
      TOUCH_DOLLY_ROTATE: 6
    };
  
    var state = STATE.NONE;
  
    var EPS = 0.000001;
  
    // current position in spherical coordinates
    var spherical = new THREE.Spherical();
    var sphericalDelta = new THREE.Spherical();
  
    var scale = 1;
    var panOffset = new THREE.Vector3();
    var zoomChanged = false;
  
    var rotateStart = new THREE.Vector2();
    var rotateEnd = new THREE.Vector2();
    var rotateDelta = new THREE.Vector2();
  
    var panStart = new THREE.Vector2();
    var panEnd = new THREE.Vector2();
    var panDelta = new THREE.Vector2();
  
    var dollyStart = new THREE.Vector2();
    var dollyEnd = new THREE.Vector2();
    var dollyDelta = new THREE.Vector2();
  
    function getAutoRotationAngle() {
  
      return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;
  
    }
  
    function getZoomScale() {
  
      return Math.pow( 0.95, scope.zoomSpeed );
  
    }
  
    function rotateLeft( angle ) {
  
      sphericalDelta.theta -= angle;
  
    }
  
    function rotateUp( angle ) {
  
      sphericalDelta.phi -= angle;
  
    }
  
    var panLeft = function () {
  
      var v = new THREE.Vector3();
  
      return function panLeft( distance, objectMatrix ) {
  
        v.setFromMatrixColumn( objectMatrix, 0 ); // get X column of objectMatrix
        v.multiplyScalar( - distance );
  
        panOffset.add( v );
  
      };
  
    }();
  
    var panUp = function () {
  
      var v = new THREE.Vector3();
  
      return function panUp( distance, objectMatrix ) {
  
        if ( scope.screenSpacePanning === true ) {
  
          v.setFromMatrixColumn( objectMatrix, 1 );
  
        } else {
  
          v.setFromMatrixColumn( objectMatrix, 0 );
          v.crossVectors( scope.object.up, v );
  
        }
  
        v.multiplyScalar( distance );
  
        panOffset.add( v );
  
      };
  
    }();
  
    // deltaX and deltaY are in pixels; right and down are positive
    var pan = function () {
  
      var offset = new THREE.Vector3();
  
      return function pan( deltaX, deltaY ) {
  
        var element = scope.domElement;
  
        if ( scope.object.isPerspectiveCamera ) {
  
          // perspective
          var position = scope.object.position;
          offset.copy( position ).sub( scope.target );
          var targetDistance = offset.length();
  
          // half of the fov is center to top of screen
          targetDistance *= Math.tan( ( scope.object.fov / 2 ) * Math.PI / 180.0 );
  
          // we use only clientHeight here so aspect ratio does not distort speed
          panLeft( 2 * deltaX * targetDistance / element.clientHeight, scope.object.matrix );
          panUp( 2 * deltaY * targetDistance / element.clientHeight, scope.object.matrix );
  
        } else if ( scope.object.isOrthographicCamera ) {
  
          // orthographic
          panLeft( deltaX * ( scope.object.right - scope.object.left ) / scope.object.zoom / element.clientWidth, scope.object.matrix );
          panUp( deltaY * ( scope.object.top - scope.object.bottom ) / scope.object.zoom / element.clientHeight, scope.object.matrix );
  
        } else {
  
          // camera neither orthographic nor perspective
          console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );
          scope.enablePan = false;
  
        }
  
      };
  
    }();
  
    function dollyOut( dollyScale ) {
  
      if ( scope.object.isPerspectiveCamera ) {
  
        scale /= dollyScale;
  
      } else if ( scope.object.isOrthographicCamera ) {
  
        scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom * dollyScale ) );
        scope.object.updateProjectionMatrix();
        zoomChanged = true;
  
      } else {
  
        console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
        scope.enableZoom = false;
  
      }
  
    }
  
    function dollyIn( dollyScale ) {
  
      if ( scope.object.isPerspectiveCamera ) {
  
        scale *= dollyScale;
  
      } else if ( scope.object.isOrthographicCamera ) {
  
        scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom / dollyScale ) );
        scope.object.updateProjectionMatrix();
        zoomChanged = true;
  
      } else {
  
        console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
        scope.enableZoom = false;
  
      }
  
    }
  
    //
    // event callbacks - update the object state
    //
  
    function handleMouseDownRotate( event ) {
  
      rotateStart.set( event.clientX, event.clientY );
  
    }
  
    function handleMouseDownDolly( event ) {
  
      dollyStart.set( event.clientX, event.clientY );
  
    }
  
    function handleMouseDownPan( event ) {
  
      panStart.set( event.clientX, event.clientY );
  
    }
  
    function handleMouseMoveRotate( event ) {
  
      rotateEnd.set( event.clientX, event.clientY );
  
      rotateDelta.subVectors( rotateEnd, rotateStart ).multiplyScalar( scope.rotateSpeed );
  
      var element = scope.domElement;
  
      rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientHeight ); // yes, height
  
      rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight );
  
      rotateStart.copy( rotateEnd );
  
      scope.update();
  
    }
  
    function handleMouseMoveDolly( event ) {
  
      dollyEnd.set( event.clientX, event.clientY );
  
      dollyDelta.subVectors( dollyEnd, dollyStart );
  
      if ( dollyDelta.y > 0 ) {
  
        dollyOut( getZoomScale() );
  
      } else if ( dollyDelta.y < 0 ) {
  
        dollyIn( getZoomScale() );
  
      }
  
      dollyStart.copy( dollyEnd );
  
      scope.update();
  
    }
  
    function handleMouseMovePan( event ) {
  
      panEnd.set( event.clientX, event.clientY );
  
      panDelta.subVectors( panEnd, panStart ).multiplyScalar( scope.panSpeed );
  
      pan( panDelta.x, panDelta.y );
  
      panStart.copy( panEnd );
  
      scope.update();
  
    }
  
    function handleMouseUp( /*event*/ ) {
  
      // no-op
  
    }
  
    function handleMouseWheel( event ) {
  
      if ( event.deltaY < 0 ) {
  
        dollyIn( getZoomScale() );
  
      } else if ( event.deltaY > 0 ) {
  
        dollyOut( getZoomScale() );
  
      }
  
      scope.update();
  
    }
  
    function handleKeyDown( event ) {
  
      var needsUpdate = false;
  
      switch ( event.keyCode ) {
  
        case scope.keys.UP:
          pan( 0, scope.keyPanSpeed );
          needsUpdate = true;
          break;
  
        case scope.keys.BOTTOM:
          pan( 0, - scope.keyPanSpeed );
          needsUpdate = true;
          break;
  
        case scope.keys.LEFT:
          pan( scope.keyPanSpeed, 0 );
          needsUpdate = true;
          break;
  
        case scope.keys.RIGHT:
          pan( - scope.keyPanSpeed, 0 );
          needsUpdate = true;
          break;
  
      }
  
      if ( needsUpdate ) {
  
        // prevent the browser from scrolling on cursor keys
        event.preventDefault();
  
        scope.update();
  
      }
  
  
    }
  
    function handleTouchStartRotate( event ) {
  
      if ( event.touches.length == 1 ) {
  
        rotateStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
  
      } else {
  
        var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
        var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );
  
        rotateStart.set( x, y );
  
      }
  
    }
  
    function handleTouchStartPan( event ) {
  
      if ( event.touches.length == 1 ) {
  
        panStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
  
      } else {
  
        var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
        var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );
  
        panStart.set( x, y );
  
      }
  
    }
  
    function handleTouchStartDolly( event ) {
  
      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 );
  
      dollyStart.set( 0, distance );
  
    }
  
    function handleTouchStartDollyPan( event ) {
  
      if ( scope.enableZoom ) handleTouchStartDolly( event );
  
      if ( scope.enablePan ) handleTouchStartPan( event );
  
    }
  
    function handleTouchStartDollyRotate( event ) {
  
      if ( scope.enableZoom ) handleTouchStartDolly( event );
  
      if ( scope.enableRotate ) handleTouchStartRotate( event );
  
    }
  
    function handleTouchMoveRotate( event ) {
  
      if ( event.touches.length == 1 ) {
  
        rotateEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
  
      } else {
  
        var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
        var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );
  
        rotateEnd.set( x, y );
  
      }
  
      rotateDelta.subVectors( rotateEnd, rotateStart ).multiplyScalar( scope.rotateSpeed );
  
      var element = scope.domElement;
  
      rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientHeight ); // yes, height
  
      rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight );
  
      rotateStart.copy( rotateEnd );
  
    }
  
    function handleTouchMovePan( event ) {
  
      if ( event.touches.length == 1 ) {
  
        panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
  
      } else {
  
        var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
        var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );
  
        panEnd.set( x, y );
  
      }
  
      panDelta.subVectors( panEnd, panStart ).multiplyScalar( scope.panSpeed );
  
      pan( panDelta.x, panDelta.y );
  
      panStart.copy( panEnd );
  
    }
  
    function handleTouchMoveDolly( event ) {
  
      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 );
  
      dollyEnd.set( 0, distance );
  
      dollyDelta.set( 0, Math.pow( dollyEnd.y / dollyStart.y, scope.zoomSpeed ) );
  
      dollyOut( dollyDelta.y );
  
      dollyStart.copy( dollyEnd );
  
    }
  
    function handleTouchMoveDollyPan( event ) {
  
      if ( scope.enableZoom ) handleTouchMoveDolly( event );
  
      if ( scope.enablePan ) handleTouchMovePan( event );
  
    }
  
    function handleTouchMoveDollyRotate( event ) {
  
      if ( scope.enableZoom ) handleTouchMoveDolly( event );
  
      if ( scope.enableRotate ) handleTouchMoveRotate( event );
  
    }
  
    function handleTouchEnd( /*event*/ ) {
  
      // no-op
  
    }
  
    //
    // event handlers - FSM: listen for events and reset state
    //
  
    function onMouseDown( event ) {
  
      if ( scope.enabled === false ) return;
  
      // Prevent the browser from scrolling.
      event.preventDefault();
  
      // Manually set the focus since calling preventDefault above
      // prevents the browser from setting it automatically.
  
      scope.domElement.focus ? scope.domElement.focus() : window.focus();
  
      var mouseAction;
  
      switch ( event.button ) {
  
        case 0:
  
          mouseAction = scope.mouseButtons.LEFT;
          break;
  
        case 1:
  
          mouseAction = scope.mouseButtons.MIDDLE;
          break;
  
        case 2:
  
          mouseAction = scope.mouseButtons.RIGHT;
          break;
  
        default:
  
          mouseAction = - 1;
  
      }
  
      switch ( mouseAction ) {
  
        case THREE.MOUSE.DOLLY:
  
          if ( scope.enableZoom === false ) return;
  
          handleMouseDownDolly( event );
  
          state = STATE.DOLLY;
  
          break;
  
        case THREE.MOUSE.ROTATE:
  
          if ( event.ctrlKey || event.metaKey || event.shiftKey ) {
  
            if ( scope.enablePan === false ) return;
  
            handleMouseDownPan( event );
  
            state = STATE.PAN;
  
          } else {
  
            if ( scope.enableRotate === false ) return;
  
            handleMouseDownRotate( event );
  
            state = STATE.ROTATE;
  
          }
  
          break;
  
        case THREE.MOUSE.PAN:
  
          if ( event.ctrlKey || event.metaKey || event.shiftKey ) {
  
            if ( scope.enableRotate === false ) return;
  
            handleMouseDownRotate( event );
  
            state = STATE.ROTATE;
  
          } else {
  
            if ( scope.enablePan === false ) return;
  
            handleMouseDownPan( event );
  
            state = STATE.PAN;
  
          }
  
          break;
  
        default:
  
          state = STATE.NONE;
  
      }
  
      if ( state !== STATE.NONE ) {
  
        document.addEventListener( 'mousemove', onMouseMove, false );
        document.addEventListener( 'mouseup', onMouseUp, false );
  
        scope.dispatchEvent( startEvent );
  
      }
  
    }
  
    function onMouseMove( event ) {
  
      if ( scope.enabled === false ) return;
  
      event.preventDefault();
  
      switch ( state ) {
  
        case STATE.ROTATE:
  
          if ( scope.enableRotate === false ) return;
  
          handleMouseMoveRotate( event );
  
          break;
  
        case STATE.DOLLY:
  
          if ( scope.enableZoom === false ) return;
  
          handleMouseMoveDolly( event );
  
          break;
  
        case STATE.PAN:
  
          if ( scope.enablePan === false ) return;
  
          handleMouseMovePan( event );
  
          break;
  
      }
  
    }
  
    function onMouseUp( event ) {
  
      if ( scope.enabled === false ) return;
  
      handleMouseUp( event );
  
      document.removeEventListener( 'mousemove', onMouseMove, false );
      document.removeEventListener( 'mouseup', onMouseUp, false );
  
      scope.dispatchEvent( endEvent );
  
      state = STATE.NONE;
  
    }
  
    function onMouseWheel( event ) {
  
      if ( scope.enabled === false || scope.enableZoom === false || ( state !== STATE.NONE && state !== STATE.ROTATE ) ) return;
  
      event.preventDefault();
      event.stopPropagation();
  
      scope.dispatchEvent( startEvent );
  
      handleMouseWheel( event );
  
      scope.dispatchEvent( endEvent );
  
    }
  
    function onKeyDown( event ) {
  
      if ( scope.enabled === false || scope.enableKeys === false || scope.enablePan === false ) return;
  
      handleKeyDown( event );
  
    }
  
    function onTouchStart( event ) {
  
      if ( scope.enabled === false ) return;
  
      event.preventDefault(); // prevent scrolling
  
      switch ( event.touches.length ) {
  
        case 1:
  
          switch ( scope.touches.ONE ) {
  
            case THREE.TOUCH.ROTATE:
  
              if ( scope.enableRotate === false ) return;
  
              handleTouchStartRotate( event );
  
              state = STATE.TOUCH_ROTATE;
  
              break;
  
            case THREE.TOUCH.PAN:
  
              if ( scope.enablePan === false ) return;
  
              handleTouchStartPan( event );
  
              state = STATE.TOUCH_PAN;
  
              break;
  
            default:
  
              state = STATE.NONE;
  
          }
  
          break;
  
        case 2:
  
          switch ( scope.touches.TWO ) {
  
            case THREE.TOUCH.DOLLY_PAN:
  
              if ( scope.enableZoom === false && scope.enablePan === false ) return;
  
              handleTouchStartDollyPan( event );
  
              state = STATE.TOUCH_DOLLY_PAN;
  
              break;
  
            case THREE.TOUCH.DOLLY_ROTATE:
  
              if ( scope.enableZoom === false && scope.enableRotate === false ) return;
  
              handleTouchStartDollyRotate( event );
  
              state = STATE.TOUCH_DOLLY_ROTATE;
  
              break;
  
            default:
  
              state = STATE.NONE;
  
          }
  
          break;
  
        default:
  
          state = STATE.NONE;
  
      }
  
      if ( state !== STATE.NONE ) {
  
        scope.dispatchEvent( startEvent );
  
      }
  
    }
  
    function onTouchMove( event ) {
  
      if ( scope.enabled === false ) return;
  
      event.preventDefault(); // prevent scrolling
      event.stopPropagation();
  
      switch ( state ) {
  
        case STATE.TOUCH_ROTATE:
  
          if ( scope.enableRotate === false ) return;
  
          handleTouchMoveRotate( event );
  
          scope.update();
  
          break;
  
        case STATE.TOUCH_PAN:
  
          if ( scope.enablePan === false ) return;
  
          handleTouchMovePan( event );
  
          scope.update();
  
          break;
  
        case STATE.TOUCH_DOLLY_PAN:
  
          if ( scope.enableZoom === false && scope.enablePan === false ) return;
  
          handleTouchMoveDollyPan( event );
  
          scope.update();
  
          break;
  
        case STATE.TOUCH_DOLLY_ROTATE:
  
          if ( scope.enableZoom === false && scope.enableRotate === false ) return;
  
          handleTouchMoveDollyRotate( event );
  
          scope.update();
  
          break;
  
        default:
  
          state = STATE.NONE;
  
      }
  
    }
  
    function onTouchEnd( event ) {
  
      if ( scope.enabled === false ) return;
  
      handleTouchEnd( event );
  
      scope.dispatchEvent( endEvent );
  
      state = STATE.NONE;
  
    }
  
    function onContextMenu( event ) {
  
      if ( scope.enabled === false ) return;
  
      event.preventDefault();
  
    }
  
    //
  
    scope.domElement.addEventListener( 'contextmenu', onContextMenu, false );
  
    scope.domElement.addEventListener( 'mousedown', onMouseDown, false );
    scope.domElement.addEventListener( 'wheel', onMouseWheel, false );
  
    scope.domElement.addEventListener( 'touchstart', onTouchStart, false );
    scope.domElement.addEventListener( 'touchend', onTouchEnd, false );
    scope.domElement.addEventListener( 'touchmove', onTouchMove, false );
  
    scope.domElement.addEventListener( 'keydown', onKeyDown, false );
  
    // make sure element can receive keys.
  
    if ( scope.domElement.tabIndex === - 1 ) {
  
      scope.domElement.tabIndex = 0;
  
    }
  
    // force an update at start
  
    this.update();
  
  };
  
  THREE.OrbitControls.prototype = Object.create( THREE.EventDispatcher.prototype );
  THREE.OrbitControls.prototype.constructor = THREE.OrbitControls;
  
  
  // This set of controls performs orbiting, dollying (zooming), and panning.
  // Unlike TrackballControls, it maintains the "up" direction object.up (+Y by default).
  // This is very similar to OrbitControls, another set of touch behavior
  //
  //    Orbit - right mouse, or left mouse + ctrl/meta/shiftKey / touch: two-finger rotate
  //    Zoom - middle mouse, or mousewheel / touch: two-finger spread or squish
  //    Pan - left mouse, or arrow keys / touch: one-finger move
  
  THREE.MapControls = function ( object, domElement ) {
  
    THREE.OrbitControls.call( this, object, domElement );
  
    this.mouseButtons.LEFT = THREE.MOUSE.PAN;
    this.mouseButtons.RIGHT = THREE.MOUSE.ROTATE;
  
    this.touches.ONE = THREE.TOUCH.PAN;
    this.touches.TWO = THREE.TOUCH.DOLLY_ROTATE;
  
  };
  
  THREE.MapControls.prototype = Object.create( THREE.EventDispatcher.prototype );
  THREE.MapControls.prototype.constructor = THREE.MapControls;