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