text: /**
   * @author richt / http://richt.me
   * @author WestLangley / http://github.com/WestLangley
   *
   * W3C Device Orientation control (http://w3c.github.io/deviceorientation/spec-source-orientation.html)
   */
  
  import {
  	Euler,
  	Math as _Math,
  	Quaternion,
  	Vector3
  } from "../../../build/three.module.js";
  
  var DeviceOrientationControls = function ( object ) {
  
  	var scope = this;
  
  	this.object = object;
  	this.object.rotation.reorder( 'YXZ' );
  
  	this.enabled = true;
  
  	this.deviceOrientation = {};
  	this.screenOrientation = 0;
  
  	this.alphaOffset = 0; // radians
  
  	var onDeviceOrientationChangeEvent = function ( event ) {
  
  		scope.deviceOrientation = event;
  
  	};
  
  	var onScreenOrientationChangeEvent = function () {
  
  		scope.screenOrientation = window.orientation || 0;
  
  	};
  
  	// The angles alpha, beta and gamma form a set of intrinsic Tait-Bryan angles of type Z-X'-Y''
  
  	var setObjectQuaternion = function () {
  
  		var zee = new Vector3( 0, 0, 1 );
  
  		var euler = new Euler();
  
  		var q0 = new Quaternion();
  
  		var q1 = new Quaternion( - Math.sqrt( 0.5 ), 0, 0, Math.sqrt( 0.5 ) ); // - PI/2 around the x-axis
  
  		return function ( quaternion, alpha, beta, gamma, orient ) {
  
  			euler.set( beta, alpha, - gamma, 'YXZ' ); // 'ZXY' for the device, but 'YXZ' for us
  
  			quaternion.setFromEuler( euler ); // orient the device
  
  			quaternion.multiply( q1 ); // camera looks out the back of the device, not the top
  
  			quaternion.multiply( q0.setFromAxisAngle( zee, - orient ) ); // adjust for screen orientation
  
  		};
  
  	}();
  
  	this.connect = function () {
  
  		onScreenOrientationChangeEvent(); // run once on load
  
  		window.addEventListener( 'orientationchange', onScreenOrientationChangeEvent, false );
  		window.addEventListener( 'deviceorientation', onDeviceOrientationChangeEvent, false );
  
  		scope.enabled = true;
  
  	};
  
  	this.disconnect = function () {
  
  		window.removeEventListener( 'orientationchange', onScreenOrientationChangeEvent, false );
  		window.removeEventListener( 'deviceorientation', onDeviceOrientationChangeEvent, false );
  
  		scope.enabled = false;
  
  	};
  
  	this.update = function () {
  
  		if ( scope.enabled === false ) return;
  
  		var device = scope.deviceOrientation;
  
  		if ( device ) {
  
  			var alpha = device.alpha ? _Math.degToRad( device.alpha ) + scope.alphaOffset : 0; // Z
  
  			var beta = device.beta ? _Math.degToRad( device.beta ) : 0; // X'
  
  			var gamma = device.gamma ? _Math.degToRad( device.gamma ) : 0; // Y''
  
  			var orient = scope.screenOrientation ? _Math.degToRad( scope.screenOrientation ) : 0; // O
  
  			setObjectQuaternion( scope.object.quaternion, alpha, beta, gamma, orient );
  
  		}
  
  
  	};
  
  	this.dispose = function () {
  
  		scope.disconnect();
  
  	};
  
  	this.connect();
  
  };
  
  export { DeviceOrientationControls };
  