text: import { Math, Vector3 } from 'three';
  
  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   * @author paulirish / http://paulirish.com/
   */
  
  const FirstPersonControls = function ( object, domElement ) {
  
  	this.object = object;
  	this.target = new Vector3( 0, 0, 0 );
  
  	this.domElement = ( domElement !== undefined ) ? domElement : document;
  
  	this.enabled = true;
  
  	this.movementSpeed = 1.0;
  	this.lookSpeed = 0.005;
  
  	this.lookVertical = true;
  	this.autoForward = false;
  
  	this.activeLook = true;
  
  	this.heightSpeed = false;
  	this.heightCoef = 1.0;
  	this.heightMin = 0.0;
  	this.heightMax = 1.0;
  
  	this.constrainVertical = false;
  	this.verticalMin = 0;
  	this.verticalMax = Math.PI;
  
  	this.autoSpeedFactor = 0.0;
  
  	this.mouseX = 0;
  	this.mouseY = 0;
  
  	this.lat = 0;
  	this.lon = 0;
  	this.phi = 0;
  	this.theta = 0;
  
  	this.moveForward = false;
  	this.moveBackward = false;
  	this.moveLeft = false;
  	this.moveRight = false;
  
  	this.mouseDragOn = false;
  
  	this.viewHalfX = 0;
  	this.viewHalfY = 0;
  
  	if ( this.domElement !== document ) {
  
  		this.domElement.setAttribute( 'tabindex', - 1 );
  
  	}
  
  	//
  
  	this.handleResize = function () {
  
  		if ( this.domElement === document ) {
  
  			this.viewHalfX = window.innerWidth / 2;
  			this.viewHalfY = window.innerHeight / 2;
  
  		} else {
  
  			this.viewHalfX = this.domElement.offsetWidth / 2;
  			this.viewHalfY = this.domElement.offsetHeight / 2;
  
  		}
  
  	};
  
  	this.onMouseDown = function ( event ) {
  
  		if ( this.domElement !== document ) {
  
  			this.domElement.focus();
  
  		}
  
  		event.preventDefault();
  		event.stopPropagation();
  
  		if ( this.activeLook ) {
  
  			switch ( event.button ) {
  
  				case 0: this.moveForward = true; break;
  				case 2: this.moveBackward = true; break;
  
  			}
  
  		}
  
  		this.mouseDragOn = true;
  
  	};
  
  	this.onMouseUp = function ( event ) {
  
  		event.preventDefault();
  		event.stopPropagation();
  
  		if ( this.activeLook ) {
  
  			switch ( event.button ) {
  
  				case 0: this.moveForward = false; break;
  				case 2: this.moveBackward = false; break;
  
  			}
  
  		}
  
  		this.mouseDragOn = false;
  
  	};
  
  	this.onMouseMove = function ( event ) {
  
  		if ( this.domElement === document ) {
  
  			this.mouseX = event.pageX - this.viewHalfX;
  			this.mouseY = event.pageY - this.viewHalfY;
  
  		} else {
  
  			this.mouseX = event.pageX - this.domElement.offsetLeft - this.viewHalfX;
  			this.mouseY = event.pageY - this.domElement.offsetTop - this.viewHalfY;
  
  		}
  
  	};
  
  	this.onKeyDown = function ( event ) {
  
  		//event.preventDefault();
  
  		switch ( event.keyCode ) {
  
  			case 38: /*up*/
  			case 87: /*W*/ this.moveForward = true; break;
  
  			case 37: /*left*/
  			case 65: /*A*/ this.moveLeft = true; break;
  
  			case 40: /*down*/
  			case 83: /*S*/ this.moveBackward = true; break;
  
  			case 39: /*right*/
  			case 68: /*D*/ this.moveRight = true; break;
  
  			case 82: /*R*/ this.moveUp = true; break;
  			case 70: /*F*/ this.moveDown = true; break;
  
  		}
  
  	};
  
  	this.onKeyUp = function ( event ) {
  
  		switch ( event.keyCode ) {
  
  			case 38: /*up*/
  			case 87: /*W*/ this.moveForward = false; break;
  
  			case 37: /*left*/
  			case 65: /*A*/ this.moveLeft = false; break;
  
  			case 40: /*down*/
  			case 83: /*S*/ this.moveBackward = false; break;
  
  			case 39: /*right*/
  			case 68: /*D*/ this.moveRight = false; break;
  
  			case 82: /*R*/ this.moveUp = false; break;
  			case 70: /*F*/ this.moveDown = false; break;
  
  		}
  
  	};
  
  	this.update = function ( delta ) {
  
  		if ( this.enabled === false ) return;
  
  		if ( this.heightSpeed ) {
  
  			var y = Math.clamp( this.object.position.y, this.heightMin, this.heightMax );
  			var heightDelta = y - this.heightMin;
  
  			this.autoSpeedFactor = delta * ( heightDelta * this.heightCoef );
  
  		} else {
  
  			this.autoSpeedFactor = 0.0;
  
  		}
  
  		var actualMoveSpeed = delta * this.movementSpeed;
  
  		if ( this.moveForward || ( this.autoForward && ! this.moveBackward ) ) this.object.translateZ( - ( actualMoveSpeed + this.autoSpeedFactor ) );
  		if ( this.moveBackward ) this.object.translateZ( actualMoveSpeed );
  
  		if ( this.moveLeft ) this.object.translateX( - actualMoveSpeed );
  		if ( this.moveRight ) this.object.translateX( actualMoveSpeed );
  
  		if ( this.moveUp ) this.object.translateY( actualMoveSpeed );
  		if ( this.moveDown ) this.object.translateY( - actualMoveSpeed );
  
  		var actualLookSpeed = delta * this.lookSpeed;
  
  		if ( ! this.activeLook ) {
  
  			actualLookSpeed = 0;
  
  		}
  
  		var verticalLookRatio = 1;
  
  		if ( this.constrainVertical ) {
  
  			verticalLookRatio = Math.PI / ( this.verticalMax - this.verticalMin );
  
  		}
  
  		this.lon += this.mouseX * actualLookSpeed;
  		if ( this.lookVertical ) this.lat -= this.mouseY * actualLookSpeed * verticalLookRatio;
  
  		this.lat = Math.max( - 85, Math.min( 85, this.lat ) );
  		this.phi = Math.degToRad( 90 - this.lat );
  
  		this.theta = Math.degToRad( this.lon );
  
  		if ( this.constrainVertical ) {
  
  			this.phi = Math.mapLinear( this.phi, 0, Math.PI, this.verticalMin, this.verticalMax );
  
  		}
  
  		var targetPosition = this.target,
  			position = this.object.position;
  
  		targetPosition.x = position.x + 100 * Math.sin( this.phi ) * Math.cos( this.theta );
  		targetPosition.y = position.y + 100 * Math.cos( this.phi );
  		targetPosition.z = position.z + 100 * Math.sin( this.phi ) * Math.sin( this.theta );
  
  		this.object.lookAt( targetPosition );
  
  	};
  
  	function contextmenu( event ) {
  
  		event.preventDefault();
  
  	}
  
  	this.dispose = function () {
  
  		this.domElement.removeEventListener( 'contextmenu', contextmenu, false );
  		this.domElement.removeEventListener( 'mousedown', _onMouseDown, false );
  		this.domElement.removeEventListener( 'mousemove', _onMouseMove, false );
  		this.domElement.removeEventListener( 'mouseup', _onMouseUp, false );
  
  		window.removeEventListener( 'keydown', _onKeyDown, false );
  		window.removeEventListener( 'keyup', _onKeyUp, false );
  
  	};
  
  	var _onMouseMove = bind( this, this.onMouseMove );
  	var _onMouseDown = bind( this, this.onMouseDown );
  	var _onMouseUp = bind( this, this.onMouseUp );
  	var _onKeyDown = bind( this, this.onKeyDown );
  	var _onKeyUp = bind( this, this.onKeyUp );
  
  	this.domElement.addEventListener( 'contextmenu', contextmenu, false );
  	this.domElement.addEventListener( 'mousemove', _onMouseMove, false );
  	this.domElement.addEventListener( 'mousedown', _onMouseDown, false );
  	this.domElement.addEventListener( 'mouseup', _onMouseUp, false );
  
  	window.addEventListener( 'keydown', _onKeyDown, false );
  	window.addEventListener( 'keyup', _onKeyUp, false );
  
  	function bind( scope, fn ) {
  
  		return function () {
  
  			fn.apply( scope, arguments );
  
  		};
  
  	}
  
  	this.handleResize();
  
  };
  
  
  export default FirstPersonControls;
  