DragControls.js 4.6 KB

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  1. ( function () {
  2. const _plane = new THREE.Plane();
  3. const _raycaster = new THREE.Raycaster();
  4. const _pointer = new THREE.Vector2();
  5. const _offset = new THREE.Vector3();
  6. const _intersection = new THREE.Vector3();
  7. const _worldPosition = new THREE.Vector3();
  8. const _inverseMatrix = new THREE.Matrix4();
  9. class DragControls extends THREE.EventDispatcher {
  10. constructor( _objects, _camera, _domElement ) {
  11. super();
  12. _domElement.style.touchAction = 'none'; // disable touch scroll
  13. let _selected = null,
  14. _hovered = null;
  15. const _intersections = []; //
  16. const scope = this;
  17. function activate() {
  18. _domElement.addEventListener( 'pointermove', onPointerMove );
  19. _domElement.addEventListener( 'pointerdown', onPointerDown );
  20. _domElement.addEventListener( 'pointerup', onPointerCancel );
  21. _domElement.addEventListener( 'pointerleave', onPointerCancel );
  22. }
  23. function deactivate() {
  24. _domElement.removeEventListener( 'pointermove', onPointerMove );
  25. _domElement.removeEventListener( 'pointerdown', onPointerDown );
  26. _domElement.removeEventListener( 'pointerup', onPointerCancel );
  27. _domElement.removeEventListener( 'pointerleave', onPointerCancel );
  28. _domElement.style.cursor = '';
  29. }
  30. function dispose() {
  31. deactivate();
  32. }
  33. function getObjects() {
  34. return _objects;
  35. }
  36. function onPointerMove( event ) {
  37. if ( scope.enabled === false ) return;
  38. updatePointer( event );
  39. _raycaster.setFromCamera( _pointer, _camera );
  40. if ( _selected ) {
  41. if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
  42. _selected.position.copy( _intersection.sub( _offset ).applyMatrix4( _inverseMatrix ) );
  43. }
  44. scope.dispatchEvent( {
  45. type: 'drag',
  46. object: _selected
  47. } );
  48. return;
  49. } // hover support
  50. if ( event.pointerType === 'mouse' || event.pointerType === 'pen' ) {
  51. _intersections.length = 0;
  52. _raycaster.setFromCamera( _pointer, _camera );
  53. _raycaster.intersectObjects( _objects, true, _intersections );
  54. if ( _intersections.length > 0 ) {
  55. const object = _intersections[ 0 ].object;
  56. _plane.setFromNormalAndCoplanarPoint( _camera.getWorldDirection( _plane.normal ), _worldPosition.setFromMatrixPosition( object.matrixWorld ) );
  57. if ( _hovered !== object && _hovered !== null ) {
  58. scope.dispatchEvent( {
  59. type: 'hoveroff',
  60. object: _hovered
  61. } );
  62. _domElement.style.cursor = 'auto';
  63. _hovered = null;
  64. }
  65. if ( _hovered !== object ) {
  66. scope.dispatchEvent( {
  67. type: 'hoveron',
  68. object: object
  69. } );
  70. _domElement.style.cursor = 'pointer';
  71. _hovered = object;
  72. }
  73. } else {
  74. if ( _hovered !== null ) {
  75. scope.dispatchEvent( {
  76. type: 'hoveroff',
  77. object: _hovered
  78. } );
  79. _domElement.style.cursor = 'auto';
  80. _hovered = null;
  81. }
  82. }
  83. }
  84. }
  85. function onPointerDown( event ) {
  86. if ( scope.enabled === false ) return;
  87. updatePointer( event );
  88. _intersections.length = 0;
  89. _raycaster.setFromCamera( _pointer, _camera );
  90. _raycaster.intersectObjects( _objects, true, _intersections );
  91. if ( _intersections.length > 0 ) {
  92. _selected = scope.transformGroup === true ? _objects[ 0 ] : _intersections[ 0 ].object;
  93. _plane.setFromNormalAndCoplanarPoint( _camera.getWorldDirection( _plane.normal ), _worldPosition.setFromMatrixPosition( _selected.matrixWorld ) );
  94. if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
  95. _inverseMatrix.copy( _selected.parent.matrixWorld ).invert();
  96. _offset.copy( _intersection ).sub( _worldPosition.setFromMatrixPosition( _selected.matrixWorld ) );
  97. }
  98. _domElement.style.cursor = 'move';
  99. scope.dispatchEvent( {
  100. type: 'dragstart',
  101. object: _selected
  102. } );
  103. }
  104. }
  105. function onPointerCancel() {
  106. if ( scope.enabled === false ) return;
  107. if ( _selected ) {
  108. scope.dispatchEvent( {
  109. type: 'dragend',
  110. object: _selected
  111. } );
  112. _selected = null;
  113. }
  114. _domElement.style.cursor = _hovered ? 'pointer' : 'auto';
  115. }
  116. function updatePointer( event ) {
  117. const rect = _domElement.getBoundingClientRect();
  118. _pointer.x = ( event.clientX - rect.left ) / rect.width * 2 - 1;
  119. _pointer.y = - ( event.clientY - rect.top ) / rect.height * 2 + 1;
  120. }
  121. activate(); // API
  122. this.enabled = true;
  123. this.transformGroup = false;
  124. this.activate = activate;
  125. this.deactivate = deactivate;
  126. this.dispose = dispose;
  127. this.getObjects = getObjects;
  128. }
  129. }
  130. THREE.DragControls = DragControls;
  131. } )();