DragControls.js 4.7 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. //
  17. const scope = this;
  18. function activate() {
  19. _domElement.addEventListener( 'pointermove', onPointerMove );
  20. _domElement.addEventListener( 'pointerdown', onPointerDown );
  21. _domElement.addEventListener( 'pointerup', onPointerCancel );
  22. _domElement.addEventListener( 'pointerleave', onPointerCancel );
  23. }
  24. function deactivate() {
  25. _domElement.removeEventListener( 'pointermove', onPointerMove );
  26. _domElement.removeEventListener( 'pointerdown', onPointerDown );
  27. _domElement.removeEventListener( 'pointerup', onPointerCancel );
  28. _domElement.removeEventListener( 'pointerleave', onPointerCancel );
  29. _domElement.style.cursor = '';
  30. }
  31. function dispose() {
  32. deactivate();
  33. }
  34. function getObjects() {
  35. return _objects;
  36. }
  37. function getRaycaster() {
  38. return _raycaster;
  39. }
  40. function onPointerMove( event ) {
  41. if ( scope.enabled === false ) return;
  42. updatePointer( event );
  43. _raycaster.setFromCamera( _pointer, _camera );
  44. if ( _selected ) {
  45. if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
  46. _selected.position.copy( _intersection.sub( _offset ).applyMatrix4( _inverseMatrix ) );
  47. }
  48. scope.dispatchEvent( {
  49. type: 'drag',
  50. object: _selected
  51. } );
  52. return;
  53. }
  54. // hover support
  55. if ( event.pointerType === 'mouse' || event.pointerType === 'pen' ) {
  56. _intersections.length = 0;
  57. _raycaster.setFromCamera( _pointer, _camera );
  58. _raycaster.intersectObjects( _objects, true, _intersections );
  59. if ( _intersections.length > 0 ) {
  60. const object = _intersections[ 0 ].object;
  61. _plane.setFromNormalAndCoplanarPoint( _camera.getWorldDirection( _plane.normal ), _worldPosition.setFromMatrixPosition( object.matrixWorld ) );
  62. if ( _hovered !== object && _hovered !== null ) {
  63. scope.dispatchEvent( {
  64. type: 'hoveroff',
  65. object: _hovered
  66. } );
  67. _domElement.style.cursor = 'auto';
  68. _hovered = null;
  69. }
  70. if ( _hovered !== object ) {
  71. scope.dispatchEvent( {
  72. type: 'hoveron',
  73. object: object
  74. } );
  75. _domElement.style.cursor = 'pointer';
  76. _hovered = object;
  77. }
  78. } else {
  79. if ( _hovered !== null ) {
  80. scope.dispatchEvent( {
  81. type: 'hoveroff',
  82. object: _hovered
  83. } );
  84. _domElement.style.cursor = 'auto';
  85. _hovered = null;
  86. }
  87. }
  88. }
  89. }
  90. function onPointerDown( event ) {
  91. if ( scope.enabled === false ) return;
  92. updatePointer( event );
  93. _intersections.length = 0;
  94. _raycaster.setFromCamera( _pointer, _camera );
  95. _raycaster.intersectObjects( _objects, true, _intersections );
  96. if ( _intersections.length > 0 ) {
  97. _selected = scope.transformGroup === true ? _objects[ 0 ] : _intersections[ 0 ].object;
  98. _plane.setFromNormalAndCoplanarPoint( _camera.getWorldDirection( _plane.normal ), _worldPosition.setFromMatrixPosition( _selected.matrixWorld ) );
  99. if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
  100. _inverseMatrix.copy( _selected.parent.matrixWorld ).invert();
  101. _offset.copy( _intersection ).sub( _worldPosition.setFromMatrixPosition( _selected.matrixWorld ) );
  102. }
  103. _domElement.style.cursor = 'move';
  104. scope.dispatchEvent( {
  105. type: 'dragstart',
  106. object: _selected
  107. } );
  108. }
  109. }
  110. function onPointerCancel() {
  111. if ( scope.enabled === false ) return;
  112. if ( _selected ) {
  113. scope.dispatchEvent( {
  114. type: 'dragend',
  115. object: _selected
  116. } );
  117. _selected = null;
  118. }
  119. _domElement.style.cursor = _hovered ? 'pointer' : 'auto';
  120. }
  121. function updatePointer( event ) {
  122. const rect = _domElement.getBoundingClientRect();
  123. _pointer.x = ( event.clientX - rect.left ) / rect.width * 2 - 1;
  124. _pointer.y = - ( event.clientY - rect.top ) / rect.height * 2 + 1;
  125. }
  126. activate();
  127. // API
  128. this.enabled = true;
  129. this.transformGroup = false;
  130. this.activate = activate;
  131. this.deactivate = deactivate;
  132. this.dispose = dispose;
  133. this.getObjects = getObjects;
  134. this.getRaycaster = getRaycaster;
  135. }
  136. }
  137. THREE.DragControls = DragControls;
  138. } )();