three.js/examples/js/controls/OrbitControls.js

( function () {

	// 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

	const _changeEvent = {
		type: 'change'
	};
	const _startEvent = {
		type: 'start'
	};
	const _endEvent = {
		type: 'end'
	};
	class OrbitControls extends THREE.EventDispatcher {

		constructor( object, domElement ) {

			super();
			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.getDistance = function () {

				return this.object.position.distanceTo( this.target );

			};

			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.removeEventListener( 'pointermove', onPointerMove );
				scope.domElement.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 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 );

			}

			//
			// event handlers - FSM: listen for events and reset state
			//

			function onPointerDown( event ) {

				if ( scope.enabled === false ) return;
				if ( pointers.length === 0 ) {

					scope.domElement.setPointerCapture( event.pointerId );
					scope.domElement.addEventListener( 'pointermove', onPointerMove );
					scope.domElement.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 ) {

				removePointer( event );
				if ( pointers.length === 0 ) {

					scope.domElement.releasePointerCapture( event.pointerId );
					scope.domElement.removeEventListener( 'pointermove', onPointerMove );
					scope.domElement.removeEventListener( 'pointerup', onPointerUp );

				}

				scope.dispatchEvent( _endEvent );
				state = STATE.NONE;

			}

			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 ) {

				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 onMouseWheel( event ) {

				if ( scope.enabled === false || scope.enableZoom === false || state !== STATE.NONE ) 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 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;

} )();