OrbitControls.js

(function () {
  // 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

  const _changeEvent = {
    type: 'change'
  }
  const _startEvent = {
    type: 'start'
  }
  const _endEvent = {
    type: 'end'
  }

  class OrbitControls extends THREE.EventDispatcher {
    constructor (object, domElement) {
      super()
      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
      this.domElement.style.touchAction = 'none' // disable touch scroll
      // 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, the interval [ min, max ] must be a sub-interval of [ - 2 PI, 2 PI ], with ( max - min < 2 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 = true // if false, pan orthogonal to world-space direction camera.up

      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 orbit when fps is 60
      // The four arrow keys

      this.keys = {
        LEFT: 'ArrowLeft',
        UP: 'ArrowUp',
        RIGHT: 'ArrowRight',
        BOTTOM: 'ArrowDown'
      } // 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 // the target DOM element for key events

      this._domElementKeyEvents = null //
      // public methods
      //

      this.getPolarAngle = function () {
        return spherical.phi
      }

      this.getAzimuthalAngle = function () {
        return spherical.theta
      }

      this.listenToKeyEvents = function (domElement) {
        domElement.addEventListener('keydown', onKeyDown)
        this._domElementKeyEvents = domElement
      }

      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 () {
        const offset = new THREE.Vector3() // so camera.up is the orbit axis

        const quat = new THREE.Quaternion().setFromUnitVectors(object.up, new THREE.Vector3(0, 1, 0))
        const quatInverse = quat.clone().invert()
        const lastPosition = new THREE.Vector3()
        const lastQuaternion = new THREE.Quaternion()
        const twoPI = 2 * Math.PI
        return function update () {
          const 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

          let min = scope.minAzimuthAngle
          let max = scope.maxAzimuthAngle

          if (isFinite(min) && isFinite(max)) {
            if (min < -Math.PI) min += twoPI; else if (min > Math.PI) min -= twoPI
            if (max < -Math.PI) max += twoPI; else if (max > Math.PI) max -= twoPI

            if (min <= max) {
              spherical.theta = Math.max(min, Math.min(max, spherical.theta))
            } else {
              spherical.theta = spherical.theta > (min + max) / 2 ? Math.max(min, spherical.theta) : Math.min(max, 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)
        scope.domElement.removeEventListener('pointerdown', onPointerDown)
        scope.domElement.removeEventListener('pointercancel', onPointerCancel)
        scope.domElement.removeEventListener('wheel', onMouseWheel)
        scope.domElement.ownerDocument.removeEventListener('pointermove', onPointerMove)
        scope.domElement.ownerDocument.removeEventListener('pointerup', onPointerUp)

        if (scope._domElementKeyEvents !== null) {
          scope._domElementKeyEvents.removeEventListener('keydown', onKeyDown)
        } // scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?
      } //
      // internals
      //

      const scope = this
      const STATE = {
        NONE: -1,
        ROTATE: 0,
        DOLLY: 1,
        PAN: 2,
        TOUCH_ROTATE: 3,
        TOUCH_PAN: 4,
        TOUCH_DOLLY_PAN: 5,
        TOUCH_DOLLY_ROTATE: 6
      }
      let state = STATE.NONE
      const EPS = 0.000001 // current position in spherical coordinates

      const spherical = new THREE.Spherical()
      const sphericalDelta = new THREE.Spherical()
      let scale = 1
      const panOffset = new THREE.Vector3()
      let zoomChanged = false
      const rotateStart = new THREE.Vector2()
      const rotateEnd = new THREE.Vector2()
      const rotateDelta = new THREE.Vector2()
      const panStart = new THREE.Vector2()
      const panEnd = new THREE.Vector2()
      const panDelta = new THREE.Vector2()
      const dollyStart = new THREE.Vector2()
      const dollyEnd = new THREE.Vector2()
      const dollyDelta = new THREE.Vector2()
      const pointers = []
      const pointerPositions = {}

      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
      }

      const panLeft = (function () {
        const v = new THREE.Vector3()
        return function panLeft (distance, objectMatrix) {
          v.setFromMatrixColumn(objectMatrix, 0) // get X column of objectMatrix

          v.multiplyScalar(-distance)
          panOffset.add(v)
        }
      }())

      const panUp = (function () {
        const 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

      const pan = (function () {
        const offset = new THREE.Vector3()
        return function pan (deltaX, deltaY) {
          const element = scope.domElement

          if (scope.object.isPerspectiveCamera) {
            // perspective
            const position = scope.object.position
            offset.copy(position).sub(scope.target)
            let 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)
        const 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 () { // no-op
      }

      function handleMouseWheel (event) {
        if (event.deltaY < 0) {
          dollyIn(getZoomScale())
        } else if (event.deltaY > 0) {
          dollyOut(getZoomScale())
        }

        scope.update()
      }

      function handleKeyDown (event) {
        let needsUpdate = false

        switch (event.code) {
          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 () {
        if (pointers.length === 1) {
          rotateStart.set(pointers[ 0 ].pageX, pointers[ 0 ].pageY)
        } else {
          const x = 0.5 * (pointers[ 0 ].pageX + pointers[ 1 ].pageX)
          const y = 0.5 * (pointers[ 0 ].pageY + pointers[ 1 ].pageY)
          rotateStart.set(x, y)
        }
      }

      function handleTouchStartPan () {
        if (pointers.length === 1) {
          panStart.set(pointers[ 0 ].pageX, pointers[ 0 ].pageY)
        } else {
          const x = 0.5 * (pointers[ 0 ].pageX + pointers[ 1 ].pageX)
          const y = 0.5 * (pointers[ 0 ].pageY + pointers[ 1 ].pageY)
          panStart.set(x, y)
        }
      }

      function handleTouchStartDolly () {
        const dx = pointers[ 0 ].pageX - pointers[ 1 ].pageX
        const dy = pointers[ 0 ].pageY - pointers[ 1 ].pageY
        const distance = Math.sqrt(dx * dx + dy * dy)
        dollyStart.set(0, distance)
      }

      function handleTouchStartDollyPan () {
        if (scope.enableZoom) handleTouchStartDolly()
        if (scope.enablePan) handleTouchStartPan()
      }

      function handleTouchStartDollyRotate () {
        if (scope.enableZoom) handleTouchStartDolly()
        if (scope.enableRotate) handleTouchStartRotate()
      }

      function handleTouchMoveRotate (event) {
        if (pointers.length == 1) {
          rotateEnd.set(event.pageX, event.pageY)
        } else {
          const position = getSecondPointerPosition(event)
          const x = 0.5 * (event.pageX + position.x)
          const y = 0.5 * (event.pageY + position.y)
          rotateEnd.set(x, y)
        }

        rotateDelta.subVectors(rotateEnd, rotateStart).multiplyScalar(scope.rotateSpeed)
        const 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 (pointers.length === 1) {
          panEnd.set(event.pageX, event.pageY)
        } else {
          const position = getSecondPointerPosition(event)
          const x = 0.5 * (event.pageX + position.x)
          const y = 0.5 * (event.pageY + position.y)
          panEnd.set(x, y)
        }

        panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed)
        pan(panDelta.x, panDelta.y)
        panStart.copy(panEnd)
      }

      function handleTouchMoveDolly (event) {
        const position = getSecondPointerPosition(event)
        const dx = event.pageX - position.x
        const dy = event.pageY - position.y
        const 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 () { // no-op
      } //
      // event handlers - FSM: listen for events and reset state
      //

      function onPointerDown (event) {
        if (scope.enabled === false) return

        if (pointers.length === 0) {
          scope.domElement.ownerDocument.addEventListener('pointermove', onPointerMove)
          scope.domElement.ownerDocument.addEventListener('pointerup', onPointerUp)
        } //

        addPointer(event)

        if (event.pointerType === 'touch') {
          onTouchStart(event)
        } else {
          onMouseDown(event)
        }
      }

      function onPointerMove (event) {
        if (scope.enabled === false) return

        if (event.pointerType === 'touch') {
          onTouchMove(event)
        } else {
          onMouseMove(event)
        }
      }

      function onPointerUp (event) {
        if (scope.enabled === false) return

        if (event.pointerType === 'touch') {
          onTouchEnd()
        } else {
          onMouseUp(event)
        }

        removePointer(event) //

        if (pointers.length === 0) {
          scope.domElement.ownerDocument.removeEventListener('pointermove', onPointerMove)
          scope.domElement.ownerDocument.removeEventListener('pointerup', onPointerUp)
        }
      }

      function onPointerCancel (event) {
        removePointer(event)
      }

      function onMouseDown (event) {
        let 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) {
          scope.dispatchEvent(_startEvent)
        }
      }

      function onMouseMove (event) {
        if (scope.enabled === false) return

        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) {
        handleMouseUp(event)
        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()
        scope.dispatchEvent(_startEvent)
        handleMouseWheel(event)
        scope.dispatchEvent(_endEvent)
      }

      function onKeyDown (event) {
        if (scope.enabled === false || scope.enablePan === false) return
        handleKeyDown(event)
      }

      function onTouchStart (event) {
        trackPointer(event)

        switch (pointers.length) {
          case 1:
            switch (scope.touches.ONE) {
              case THREE.TOUCH.ROTATE:
                if (scope.enableRotate === false) return
                handleTouchStartRotate()
                state = STATE.TOUCH_ROTATE
                break

              case THREE.TOUCH.PAN:
                if (scope.enablePan === false) return
                handleTouchStartPan()
                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()
                state = STATE.TOUCH_DOLLY_PAN
                break

              case THREE.TOUCH.DOLLY_ROTATE:
                if (scope.enableZoom === false && scope.enableRotate === false) return
                handleTouchStartDollyRotate()
                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) {
        trackPointer(event)

        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) {
        handleTouchEnd(event)
        scope.dispatchEvent(_endEvent)
        state = STATE.NONE
      }

      function onContextMenu (event) {
        if (scope.enabled === false) return
        event.preventDefault()
      }

      function addPointer (event) {
        pointers.push(event)
      }

      function removePointer (event) {
        delete pointerPositions[ event.pointerId ]

        for (let i = 0; i < pointers.length; i++) {
          if (pointers[ i ].pointerId == event.pointerId) {
            pointers.splice(i, 1)
            return
          }
        }
      }

      function trackPointer (event) {
        let position = pointerPositions[ event.pointerId ]

        if (position === undefined) {
          position = new THREE.Vector2()
          pointerPositions[ event.pointerId ] = position
        }

        position.set(event.pageX, event.pageY)
      }

      function getSecondPointerPosition (event) {
        const pointer = event.pointerId === pointers[ 0 ].pointerId ? pointers[ 1 ] : pointers[ 0 ]
        return pointerPositions[ pointer.pointerId ]
      } //

      scope.domElement.addEventListener('contextmenu', onContextMenu)
      scope.domElement.addEventListener('pointerdown', onPointerDown)
      scope.domElement.addEventListener('pointercancel', onPointerCancel)
      scope.domElement.addEventListener('wheel', onMouseWheel, {
        passive: false
      }) // force an update at start

      this.update()
    }
  } // 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

  class MapControls extends OrbitControls {
    constructor (object, domElement) {
      super(object, domElement)
      this.screenSpacePanning = false // pan orthogonal to world-space direction camera.up

      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 = MapControls
  THREE.OrbitControls = OrbitControls
})()