( function () {
const _plane = new THREE.Plane();
const _raycaster = new THREE.Raycaster();
const _pointer = new THREE.Vector2();
const _offset = new THREE.Vector3();
const _intersection = new THREE.Vector3();
const _worldPosition = new THREE.Vector3();
const _inverseMatrix = new THREE.Matrix4();
class DragControls extends THREE.EventDispatcher {
constructor( _objects, _camera, _domElement ) {
super();
_domElement.style.touchAction = 'none'; // disable touch scroll
let _selected = null,
_hovered = null;
const _intersections = []; //
const scope = this;
function activate() {
_domElement.addEventListener( 'pointermove', onPointerMove );
_domElement.addEventListener( 'pointerdown', onPointerDown );
_domElement.addEventListener( 'pointerup', onPointerCancel );
_domElement.addEventListener( 'pointerleave', onPointerCancel );
}
function deactivate() {
_domElement.removeEventListener( 'pointermove', onPointerMove );
_domElement.removeEventListener( 'pointerdown', onPointerDown );
_domElement.removeEventListener( 'pointerup', onPointerCancel );
_domElement.removeEventListener( 'pointerleave', onPointerCancel );
_domElement.style.cursor = '';
}
function dispose() {
deactivate();
}
function getObjects() {
return _objects;
}
function getRaycaster() {
return _raycaster;
}
function onPointerMove( event ) {
if ( scope.enabled === false ) return;
updatePointer( event );
_raycaster.setFromCamera( _pointer, _camera );
if ( _selected ) {
if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
_selected.position.copy( _intersection.sub( _offset ).applyMatrix4( _inverseMatrix ) );
}
scope.dispatchEvent( {
type: 'drag',
object: _selected
} );
return;
} // hover support
if ( event.pointerType === 'mouse' || event.pointerType === 'pen' ) {
_intersections.length = 0;
_raycaster.setFromCamera( _pointer, _camera );
_raycaster.intersectObjects( _objects, true, _intersections );
if ( _intersections.length > 0 ) {
const object = _intersections[ 0 ].object;
_plane.setFromNormalAndCoplanarPoint( _camera.getWorldDirection( _plane.normal ), _worldPosition.setFromMatrixPosition( object.matrixWorld ) );
if ( _hovered !== object && _hovered !== null ) {
scope.dispatchEvent( {
type: 'hoveroff',
object: _hovered
} );
_domElement.style.cursor = 'auto';
_hovered = null;
}
if ( _hovered !== object ) {
scope.dispatchEvent( {
type: 'hoveron',
object: object
} );
_domElement.style.cursor = 'pointer';
_hovered = object;
}
} else {
if ( _hovered !== null ) {
scope.dispatchEvent( {
type: 'hoveroff',
object: _hovered
} );
_domElement.style.cursor = 'auto';
_hovered = null;
}
}
}
}
function onPointerDown( event ) {
if ( scope.enabled === false ) return;
updatePointer( event );
_intersections.length = 0;
_raycaster.setFromCamera( _pointer, _camera );
_raycaster.intersectObjects( _objects, true, _intersections );
if ( _intersections.length > 0 ) {
_selected = scope.transformGroup === true ? _objects[ 0 ] : _intersections[ 0 ].object;
_plane.setFromNormalAndCoplanarPoint( _camera.getWorldDirection( _plane.normal ), _worldPosition.setFromMatrixPosition( _selected.matrixWorld ) );
if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
_inverseMatrix.copy( _selected.parent.matrixWorld ).invert();
_offset.copy( _intersection ).sub( _worldPosition.setFromMatrixPosition( _selected.matrixWorld ) );
}
_domElement.style.cursor = 'move';
scope.dispatchEvent( {
type: 'dragstart',
object: _selected
} );
}
}
function onPointerCancel() {
if ( scope.enabled === false ) return;
if ( _selected ) {
scope.dispatchEvent( {
type: 'dragend',
object: _selected
} );
_selected = null;
}
_domElement.style.cursor = _hovered ? 'pointer' : 'auto';
}
function updatePointer( event ) {
const rect = _domElement.getBoundingClientRect();
_pointer.x = ( event.clientX - rect.left ) / rect.width * 2 - 1;
_pointer.y = - ( event.clientY - rect.top ) / rect.height * 2 + 1;
}
activate(); // API
this.enabled = true;
this.transformGroup = false;
this.activate = activate;
this.deactivate = deactivate;
this.dispose = dispose;
this.getObjects = getObjects;
this.getRaycaster = getRaycaster;
}
}
THREE.DragControls = DragControls;
} )();
