text: /**
   * @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
  
  var initialX = null;
  var initialY = null;
  var diffX = 0;
  var diffY = 0;
  const SWIPE_MIN_DISTANCE = 15
  
  THREE.OrbitControls = function(object, domElement) {
  
      this.object = object;
  
      this.domElement = (domElement !== undefined) ? domElement : document;
  
      // 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().invert();
  
          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);
  
          window.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 === document ? scope.domElement.body : 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 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;
  
          }
  
      }
  
      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;
  
          }
  
      }
  
      //
      // 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 === document ? scope.domElement.body : 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) {
  
              dollyIn(getZoomScale());
  
          } else if (dollyDelta.y < 0) {
  
              dollyOut(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) {
  
              dollyOut(getZoomScale());
  
          } else if (event.deltaY > 0) {
  
              dollyIn(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 === document ? scope.domElement.body : 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));
  
          dollyIn(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;
  
          event.preventDefault();
  
          scope.domElement.focus ? scope.domElement.focus() : window.focus();
  
          switch (event.button) {
              case 0:
                  switch (scope.mouseButtons.LEFT) {
                      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;
                  }
                  break;
  
              case 1:
                  switch (scope.mouseButtons.MIDDLE) {
                      case THREE.MOUSE.DOLLY:
                          if (scope.enableZoom === false) return;
                          handleMouseDownDolly(event);
                          state = STATE.DOLLY;
                          break;
  
                      default:
                          state = STATE.NONE;
                  }
                  break;
  
              case 2:
                  switch (scope.mouseButtons.RIGHT) {
                      case THREE.MOUSE.ROTATE:
                          if (scope.enableRotate === false) return;
                          handleMouseDownRotate(event);
                          state = STATE.ROTATE;
                          break;
  
                      case THREE.MOUSE.PAN:
                          if (scope.enablePan === false) return;
                          handleMouseDownPan(event);
                          state = STATE.PAN;
                          break;
  
                      default:
                          state = STATE.NONE;
                  }
                  break;
          }
  
          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();
          touch_info = event.touches
          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:
                          initialX = event.touches[0].clientX;
                          initialY = event.touches[0].clientY;
                  }
                  break;
  
              case 2:
                  switch (scope.touches.TWO) {
                      case THREE.TOUCH.ROTATE:
  
                          handleTouchStartDollyPan(event);
                          state = STATE.TOUCH_DOLLY_PAN;
                          break;
  
                      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;
  
              case 3:
                  if (scope.enableRotate === false) return;
                  handleTouchStartRotate(event);
                  state = STATE.TOUCH_ROTATE;
                  break;
  
              default:
                  state = STATE.NONE;
          }
  
          if (state !== STATE.NONE) {
              scope.dispatchEvent(startEvent);
          }
      }
  
      function onTouchMove(event) {
  
          if (scope.enabled === false) return;
  
          event.preventDefault();
          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:
                  if (initialX === null || initialY === null) return
                  var currentX = event.touches[0].clientX;
                  var currentY = event.touches[0].clientY;
                  diffX = initialX - currentX;
                  diffY = initialY - currentY;
          }
  
      }
  
      function onTouchEnd(event) {
  
          if (scope.enabled === false) return;
  
          handleTouchEnd(event);
  
          scope.dispatchEvent(endEvent);
  
          state = STATE.NONE;
  
          // $id('title').innerHTML = `touch end ${diffY} ${diffX}`
          if (Math.abs(diffX) > Math.abs(diffY) && Math.abs(diffX) > SWIPE_MIN_DISTANCE) {
              if (diffX > 0) {
                  player.addMove(player.left.bind(player))
              } else {
                  player.addMove(player.right.bind(player))
              }
          } else if (Math.abs(diffY) > SWIPE_MIN_DISTANCE) {
              if (diffY > 0) {
                  player.addMove(player.pitchUp.bind(player))
              } else {
                  player.addMove(player.pitchDown.bind(player))
              }
          }
  
          initialX = null;
          initialY = null;
  
      }
  
      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);
  
      window.addEventListener('keydown', onKeyDown, false);
  
      // 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;
  