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import {
EventDispatcher,
MathUtils,
MOUSE,
Quaternion,
Vector2,
Vector3
} from 'three';
const _changeEvent = { type: 'change' };
const _startEvent = { type: 'start' };
const _endEvent = { type: 'end' };
class TrackballControls extends EventDispatcher {
constructor( object, domElement ) {
super();
const scope = this;
const STATE = { NONE: - 1, ROTATE: 0, ZOOM: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_ZOOM_PAN: 4 };
this.object = object;
this.domElement = domElement;
this.domElement.style.touchAction = 'none'; // disable touch scroll
// API
this.enabled = true;
this.screen = { left: 0, top: 0, width: 0, height: 0 };
this.rotateSpeed = 1.0;
this.zoomSpeed = 1.2;
this.panSpeed = 0.3;
this.noRotate = false;
this.noZoom = false;
this.noPan = false;
this.staticMoving = false;
this.dynamicDampingFactor = 0.2;
this.minDistance = 0;
this.maxDistance = Infinity;
this.minZoom = 0;
this.maxZoom = Infinity;
this.keys = [ 'KeyA' /*A*/, 'KeyS' /*S*/, 'KeyD' /*D*/ ];
this.mouseButtons = { LEFT: MOUSE.ROTATE, MIDDLE: MOUSE.DOLLY, RIGHT: MOUSE.PAN };
// internals
this.target = new Vector3();
const EPS = 0.000001;
const lastPosition = new Vector3();
let lastZoom = 1;
let _state = STATE.NONE,
_keyState = STATE.NONE,
_touchZoomDistanceStart = 0,
_touchZoomDistanceEnd = 0,
_lastAngle = 0;
const _eye = new Vector3(),
_movePrev = new Vector2(),
_moveCurr = new Vector2(),
_lastAxis = new Vector3(),
_zoomStart = new Vector2(),
_zoomEnd = new Vector2(),
_panStart = new Vector2(),
_panEnd = new Vector2(),
_pointers = [],
_pointerPositions = {};
// for reset
this.target0 = this.target.clone();
this.position0 = this.object.position.clone();
this.up0 = this.object.up.clone();
this.zoom0 = this.object.zoom;
// methods
this.handleResize = function () {
const box = scope.domElement.getBoundingClientRect();
// adjustments come from similar code in the jquery offset() function
const d = scope.domElement.ownerDocument.documentElement;
scope.screen.left = box.left + window.pageXOffset - d.clientLeft;
scope.screen.top = box.top + window.pageYOffset - d.clientTop;
scope.screen.width = box.width;
scope.screen.height = box.height;
};
const getMouseOnScreen = ( function () {
const vector = new Vector2();
return function getMouseOnScreen( pageX, pageY ) {
vector.set(
( pageX - scope.screen.left ) / scope.screen.width,
( pageY - scope.screen.top ) / scope.screen.height
);
return vector;
};
}() );
const getMouseOnCircle = ( function () {
const vector = new Vector2();
return function getMouseOnCircle( pageX, pageY ) {
vector.set(
( ( pageX - scope.screen.width * 0.5 - scope.screen.left ) / ( scope.screen.width * 0.5 ) ),
( ( scope.screen.height + 2 * ( scope.screen.top - pageY ) ) / scope.screen.width ) // screen.width intentional
);
return vector;
};
}() );
this.rotateCamera = ( function () {
const axis = new Vector3(),
quaternion = new Quaternion(),
eyeDirection = new Vector3(),
objectUpDirection = new Vector3(),
objectSidewaysDirection = new Vector3(),
moveDirection = new Vector3();
return function rotateCamera() {
moveDirection.set( _moveCurr.x - _movePrev.x, _moveCurr.y - _movePrev.y, 0 );
let angle = moveDirection.length();
if ( angle ) {
_eye.copy( scope.object.position ).sub( scope.target );
eyeDirection.copy( _eye ).normalize();
objectUpDirection.copy( scope.object.up ).normalize();
objectSidewaysDirection.crossVectors( objectUpDirection, eyeDirection ).normalize();
objectUpDirection.setLength( _moveCurr.y - _movePrev.y );
objectSidewaysDirection.setLength( _moveCurr.x - _movePrev.x );
moveDirection.copy( objectUpDirection.add( objectSidewaysDirection ) );
axis.crossVectors( moveDirection, _eye ).normalize();
angle *= scope.rotateSpeed;
quaternion.setFromAxisAngle( axis, angle );
_eye.applyQuaternion( quaternion );
scope.object.up.applyQuaternion( quaternion );
_lastAxis.copy( axis );
_lastAngle = angle;
} else if ( ! scope.staticMoving && _lastAngle ) {
_lastAngle *= Math.sqrt( 1.0 - scope.dynamicDampingFactor );
_eye.copy( scope.object.position ).sub( scope.target );
quaternion.setFromAxisAngle( _lastAxis, _lastAngle );
_eye.applyQuaternion( quaternion );
scope.object.up.applyQuaternion( quaternion );
}
_movePrev.copy( _moveCurr );
};
}() );
this.zoomCamera = function () {
let factor;
if ( _state === STATE.TOUCH_ZOOM_PAN ) {
factor = _touchZoomDistanceStart / _touchZoomDistanceEnd;
_touchZoomDistanceStart = _touchZoomDistanceEnd;
if ( scope.object.isPerspectiveCamera ) {
_eye.multiplyScalar( factor );
} else if ( scope.object.isOrthographicCamera ) {
scope.object.zoom = MathUtils.clamp( scope.object.zoom / factor, scope.minZoom, scope.maxZoom );
if ( lastZoom !== scope.object.zoom ) {
scope.object.updateProjectionMatrix();
}
} else {
console.warn( 'THREE.TrackballControls: Unsupported camera type' );
}
} else {
factor = 1.0 + ( _zoomEnd.y - _zoomStart.y ) * scope.zoomSpeed;
if ( factor !== 1.0 && factor > 0.0 ) {
if ( scope.object.isPerspectiveCamera ) {
_eye.multiplyScalar( factor );
} else if ( scope.object.isOrthographicCamera ) {
scope.object.zoom = MathUtils.clamp( scope.object.zoom / factor, scope.minZoom, scope.maxZoom );
if ( lastZoom !== scope.object.zoom ) {
scope.object.updateProjectionMatrix();
}
} else {
console.warn( 'THREE.TrackballControls: Unsupported camera type' );
}
}
if ( scope.staticMoving ) {
_zoomStart.copy( _zoomEnd );
} else {
_zoomStart.y += ( _zoomEnd.y - _zoomStart.y ) * this.dynamicDampingFactor;
}
}
};
this.panCamera = ( function () {
const mouseChange = new Vector2(),
objectUp = new Vector3(),
pan = new Vector3();
return function panCamera() {
mouseChange.copy( _panEnd ).sub( _panStart );
if ( mouseChange.lengthSq() ) {
if ( scope.object.isOrthographicCamera ) {
const scale_x = ( scope.object.right - scope.object.left ) / scope.object.zoom / scope.domElement.clientWidth;
const scale_y = ( scope.object.top - scope.object.bottom ) / scope.object.zoom / scope.domElement.clientWidth;
mouseChange.x *= scale_x;
mouseChange.y *= scale_y;
}
mouseChange.multiplyScalar( _eye.length() * scope.panSpeed );
pan.copy( _eye ).cross( scope.object.up ).setLength( mouseChange.x );
pan.add( objectUp.copy( scope.object.up ).setLength( mouseChange.y ) );
scope.object.position.add( pan );
scope.target.add( pan );
if ( scope.staticMoving ) {
_panStart.copy( _panEnd );
} else {
_panStart.add( mouseChange.subVectors( _panEnd, _panStart ).multiplyScalar( scope.dynamicDampingFactor ) );
}
}
};
}() );
this.checkDistances = function () {
if ( ! scope.noZoom || ! scope.noPan ) {
if ( _eye.lengthSq() > scope.maxDistance * scope.maxDistance ) {
scope.object.position.addVectors( scope.target, _eye.setLength( scope.maxDistance ) );
_zoomStart.copy( _zoomEnd );
}
if ( _eye.lengthSq() < scope.minDistance * scope.minDistance ) {
scope.object.position.addVectors( scope.target, _eye.setLength( scope.minDistance ) );
_zoomStart.copy( _zoomEnd );
}
}
};
this.update = function () {
_eye.subVectors( scope.object.position, scope.target );
if ( ! scope.noRotate ) {
scope.rotateCamera();
}
if ( ! scope.noZoom ) {
scope.zoomCamera();
}
if ( ! scope.noPan ) {
scope.panCamera();
}
scope.object.position.addVectors( scope.target, _eye );
if ( scope.object.isPerspectiveCamera ) {
scope.checkDistances();
scope.object.lookAt( scope.target );
if ( lastPosition.distanceToSquared( scope.object.position ) > EPS ) {
scope.dispatchEvent( _changeEvent );
lastPosition.copy( scope.object.position );
}
} else if ( scope.object.isOrthographicCamera ) {
scope.object.lookAt( scope.target );
if ( lastPosition.distanceToSquared( scope.object.position ) > EPS || lastZoom !== scope.object.zoom ) {
scope.dispatchEvent( _changeEvent );
lastPosition.copy( scope.object.position );
lastZoom = scope.object.zoom;
}
} else {
console.warn( 'THREE.TrackballControls: Unsupported camera type' );
}
};
this.reset = function () {
_state = STATE.NONE;
_keyState = STATE.NONE;
scope.target.copy( scope.target0 );
scope.object.position.copy( scope.position0 );
scope.object.up.copy( scope.up0 );
scope.object.zoom = scope.zoom0;
scope.object.updateProjectionMatrix();
_eye.subVectors( scope.object.position, scope.target );
scope.object.lookAt( scope.target );
scope.dispatchEvent( _changeEvent );
lastPosition.copy( scope.object.position );
lastZoom = scope.object.zoom;
};
// listeners
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 ) {
if ( scope.enabled === false ) return;
if ( event.pointerType === 'touch' ) {
onTouchEnd( event );
} else {
onMouseUp();
}
//
removePointer( event );
if ( _pointers.length === 0 ) {
scope.domElement.releasePointerCapture( event.pointerId );
scope.domElement.removeEventListener( 'pointermove', onPointerMove );
scope.domElement.removeEventListener( 'pointerup', onPointerUp );
}
}
function onPointerCancel( event ) {
removePointer( event );
}
function keydown( event ) {
if ( scope.enabled === false ) return;
window.removeEventListener( 'keydown', keydown );
if ( _keyState !== STATE.NONE ) {
return;
} else if ( event.code === scope.keys[ STATE.ROTATE ] && ! scope.noRotate ) {
_keyState = STATE.ROTATE;
} else if ( event.code === scope.keys[ STATE.ZOOM ] && ! scope.noZoom ) {
_keyState = STATE.ZOOM;
} else if ( event.code === scope.keys[ STATE.PAN ] && ! scope.noPan ) {
_keyState = STATE.PAN;
}
}
function keyup() {
if ( scope.enabled === false ) return;
_keyState = STATE.NONE;
window.addEventListener( 'keydown', keydown );
}
function onMouseDown( event ) {
if ( _state === STATE.NONE ) {
switch ( event.button ) {
case scope.mouseButtons.LEFT:
_state = STATE.ROTATE;
break;
case scope.mouseButtons.MIDDLE:
_state = STATE.ZOOM;
break;
case scope.mouseButtons.RIGHT:
_state = STATE.PAN;
break;
}
}
const state = ( _keyState !== STATE.NONE ) ? _keyState : _state;
if ( state === STATE.ROTATE && ! scope.noRotate ) {
_moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
_movePrev.copy( _moveCurr );
} else if ( state === STATE.ZOOM && ! scope.noZoom ) {
_zoomStart.copy( getMouseOnScreen( event.pageX, event.pageY ) );
_zoomEnd.copy( _zoomStart );
} else if ( state === STATE.PAN && ! scope.noPan ) {
_panStart.copy( getMouseOnScreen( event.pageX, event.pageY ) );
_panEnd.copy( _panStart );
}
scope.dispatchEvent( _startEvent );
}
function onMouseMove( event ) {
const state = ( _keyState !== STATE.NONE ) ? _keyState : _state;
if ( state === STATE.ROTATE && ! scope.noRotate ) {
_movePrev.copy( _moveCurr );
_moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
} else if ( state === STATE.ZOOM && ! scope.noZoom ) {
_zoomEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) );
} else if ( state === STATE.PAN && ! scope.noPan ) {
_panEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) );
}
}
function onMouseUp() {
_state = STATE.NONE;
scope.dispatchEvent( _endEvent );
}
function onMouseWheel( event ) {
if ( scope.enabled === false ) return;
if ( scope.noZoom === true ) return;
event.preventDefault();
switch ( event.deltaMode ) {
case 2:
// Zoom in pages
_zoomStart.y -= event.deltaY * 0.025;
break;
case 1:
// Zoom in lines
_zoomStart.y -= event.deltaY * 0.01;
break;
default:
// undefined, 0, assume pixels
_zoomStart.y -= event.deltaY * 0.00025;
break;
}
scope.dispatchEvent( _startEvent );
scope.dispatchEvent( _endEvent );
}
function onTouchStart( event ) {
trackPointer( event );
switch ( _pointers.length ) {
case 1:
_state = STATE.TOUCH_ROTATE;
_moveCurr.copy( getMouseOnCircle( _pointers[ 0 ].pageX, _pointers[ 0 ].pageY ) );
_movePrev.copy( _moveCurr );
break;
default: // 2 or more
_state = STATE.TOUCH_ZOOM_PAN;
const dx = _pointers[ 0 ].pageX - _pointers[ 1 ].pageX;
const dy = _pointers[ 0 ].pageY - _pointers[ 1 ].pageY;
_touchZoomDistanceEnd = _touchZoomDistanceStart = Math.sqrt( dx * dx + dy * dy );
const x = ( _pointers[ 0 ].pageX + _pointers[ 1 ].pageX ) / 2;
const y = ( _pointers[ 0 ].pageY + _pointers[ 1 ].pageY ) / 2;
_panStart.copy( getMouseOnScreen( x, y ) );
_panEnd.copy( _panStart );
break;
}
scope.dispatchEvent( _startEvent );
}
function onTouchMove( event ) {
trackPointer( event );
switch ( _pointers.length ) {
case 1:
_movePrev.copy( _moveCurr );
_moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
break;
default: // 2 or more
const position = getSecondPointerPosition( event );
const dx = event.pageX - position.x;
const dy = event.pageY - position.y;
_touchZoomDistanceEnd = Math.sqrt( dx * dx + dy * dy );
const x = ( event.pageX + position.x ) / 2;
const y = ( event.pageY + position.y ) / 2;
_panEnd.copy( getMouseOnScreen( x, y ) );
break;
}
}
function onTouchEnd( event ) {
switch ( _pointers.length ) {
case 0:
_state = STATE.NONE;
break;
case 1:
_state = STATE.TOUCH_ROTATE;
_moveCurr.copy( getMouseOnCircle( event.pageX, event.pageY ) );
_movePrev.copy( _moveCurr );
break;
case 2:
_state = STATE.TOUCH_ZOOM_PAN;
for ( let i = 0; i < _pointers.length; i ++ ) {
if ( _pointers[ i ].pointerId !== event.pointerId ) {
const position = _pointerPositions[ _pointers[ i ].pointerId ];
_moveCurr.copy( getMouseOnCircle( position.x, position.y ) );
_movePrev.copy( _moveCurr );
break;
}
}
break;
}
scope.dispatchEvent( _endEvent );
}
function contextmenu( 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 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 ];
}
this.dispose = function () {
scope.domElement.removeEventListener( 'contextmenu', contextmenu );
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 );
window.removeEventListener( 'keydown', keydown );
window.removeEventListener( 'keyup', keyup );
};
this.domElement.addEventListener( 'contextmenu', contextmenu );
this.domElement.addEventListener( 'pointerdown', onPointerDown );
this.domElement.addEventListener( 'pointercancel', onPointerCancel );
this.domElement.addEventListener( 'wheel', onMouseWheel, { passive: false } );
window.addEventListener( 'keydown', keydown );
window.addEventListener( 'keyup', keyup );
this.handleResize();
// force an update at start
this.update();
}
}
export { TrackballControls };