three 基础库
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( function () {
const _zee = new THREE.Vector3( 0, 0, 1 );
const _euler = new THREE.Euler();
const _q0 = new THREE.Quaternion();
const _q1 = new THREE.Quaternion( - Math.sqrt( 0.5 ), 0, 0, Math.sqrt( 0.5 ) ); // - PI/2 around the x-axis
const _changeEvent = {
type: 'change'
};
class DeviceOrientationControls extends THREE.EventDispatcher {
constructor( object ) {
super();
if ( window.isSecureContext === false ) {
console.error( 'THREE.DeviceOrientationControls: DeviceOrientationEvent is only available in secure contexts (https)' );
}
const scope = this;
const EPS = 0.000001;
const lastQuaternion = new THREE.Quaternion();
this.object = object;
this.object.rotation.reorder( 'YXZ' );
this.enabled = true;
this.deviceOrientation = {};
this.screenOrientation = 0;
this.alphaOffset = 0; // radians
const onDeviceOrientationChangeEvent = function ( event ) {
scope.deviceOrientation = event;
};
const 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''
const setObjectQuaternion = 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
// iOS 13+
if ( window.DeviceOrientationEvent !== undefined && typeof window.DeviceOrientationEvent.requestPermission === 'function' ) {
window.DeviceOrientationEvent.requestPermission().then( function ( response ) {
if ( response == 'granted' ) {
window.addEventListener( 'orientationchange', onScreenOrientationChangeEvent );
window.addEventListener( 'deviceorientation', onDeviceOrientationChangeEvent );
}
} ).catch( function ( error ) {
console.error( 'THREE.DeviceOrientationControls: Unable to use DeviceOrientation API:', error );
} );
} else {
window.addEventListener( 'orientationchange', onScreenOrientationChangeEvent );
window.addEventListener( 'deviceorientation', onDeviceOrientationChangeEvent );
}
scope.enabled = true;
};
this.disconnect = function () {
window.removeEventListener( 'orientationchange', onScreenOrientationChangeEvent );
window.removeEventListener( 'deviceorientation', onDeviceOrientationChangeEvent );
scope.enabled = false;
};
this.update = function () {
if ( scope.enabled === false ) return;
const device = scope.deviceOrientation;
if ( device ) {
const alpha = device.alpha ? THREE.MathUtils.degToRad( device.alpha ) + scope.alphaOffset : 0; // Z
const beta = device.beta ? THREE.MathUtils.degToRad( device.beta ) : 0; // X'
const gamma = device.gamma ? THREE.MathUtils.degToRad( device.gamma ) : 0; // Y''
const orient = scope.screenOrientation ? THREE.MathUtils.degToRad( scope.screenOrientation ) : 0; // O
setObjectQuaternion( scope.object.quaternion, alpha, beta, gamma, orient );
if ( 8 * ( 1 - lastQuaternion.dot( scope.object.quaternion ) ) > EPS ) {
lastQuaternion.copy( scope.object.quaternion );
scope.dispatchEvent( _changeEvent );
}
}
};
this.dispose = function () {
scope.disconnect();
};
this.connect();
}
}
THREE.DeviceOrientationControls = DeviceOrientationControls;
} )();