君子性非异也,善假于物也 - Threejs 引入TrackballControls 查看场景
太阳火神的美丽人生 (http://blog.csdn.net/opengl_es)
本文遵循“署名-非商业用途-保持一致”创作公用协议
以下为 html 源文件中引入 TrackballControls 库的关键代码,其中 camera 和 renderer 需要对 Threejs 有所了解方可理解:
<script> var controls; controls = new THREE.TrackballControls( camera, renderer.domElement ); function animate() { requestAnimationFrame( animate, renderer.domElement ); controls.update(); renderer.render( scene, camera ); } </script>
以下代码归原作者所有,但在以下所署两网址未找到与此一致的最新代码,而有一些类似的可用代码,可以参考一下。
上面代码中引用的 js/controls/TrackballControls.js 代码原文,可拷贝可新建 TrackballControls.js 引入,并按上面方式使用即可:
/** * @author Eberhard Graether / http://egraether.com/ * @author Mark Lundin / http://mark-lundin.com */ THREE.TrackballControls = function ( object, domElement ) { var _this = this; var STATE = { NONE: -1, ROTATE: 0, ZOOM: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_ZOOM_PAN: 4 }; this.object = object; this.domElement = ( domElement !== undefined ) ? domElement : document; // 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.noRoll = false; this.staticMoving = false; this.dynamicDampingFactor = 0.2; this.minDistance = 0; this.maxDistance = Infinity; this.keys = [ 65 /*A*/, 83 /*S*/, 68 /*D*/ ]; // internals this.target = new THREE.Vector3(); var EPS = 0.000001; var lastPosition = new THREE.Vector3(); var _state = STATE.NONE, _prevState = STATE.NONE, _eye = new THREE.Vector3(), _rotateStart = new THREE.Vector3(), _rotateEnd = new THREE.Vector3(), _zoomStart = new THREE.Vector2(), _zoomEnd = new THREE.Vector2(), _touchZoomDistanceStart = 0, _touchZoomDistanceEnd = 0, _panStart = new THREE.Vector2(), _panEnd = new THREE.Vector2(); // for reset this.target0 = this.target.clone(); this.position0 = this.object.position.clone(); this.up0 = this.object.up.clone(); // events var changeEvent = { type: 'change' }; var startEvent = { type: 'start'}; var endEvent = { type: 'end'}; // methods this.handleResize = function () { if ( this.domElement === document ) { this.screen.left = 0; this.screen.top = 0; this.screen.width = window.innerWidth; this.screen.height = window.innerHeight; } else { var box = this.domElement.getBoundingClientRect(); // adjustments come from similar code in the jquery offset() function var d = this.domElement.ownerDocument.documentElement; this.screen.left = box.left + window.pageXOffset - d.clientLeft; this.screen.top = box.top + window.pageYOffset - d.clientTop; this.screen.width = box.width; this.screen.height = box.height; } }; this.handleEvent = function ( event ) { if ( typeof this[ event.type ] == 'function' ) { this[ event.type ]( event ); } }; var getMouseOnScreen = ( function () { var vector = new THREE.Vector2(); return function ( pageX, pageY ) { vector.set( ( pageX - _this.screen.left ) / _this.screen.width, ( pageY - _this.screen.top ) / _this.screen.height ); return vector; }; }() ); var getMouseProjectionOnBall = ( function () { var vector = new THREE.Vector3(); var objectUp = new THREE.Vector3(); var mouseOnBall = new THREE.Vector3(); return function ( pageX, pageY ) { mouseOnBall.set( ( pageX - _this.screen.width * 0.5 - _this.screen.left ) / (_this.screen.width*.5), ( _this.screen.height * 0.5 + _this.screen.top - pageY ) / (_this.screen.height*.5), 0.0 ); var length = mouseOnBall.length(); if ( _this.noRoll ) { if ( length < Math.SQRT1_2 ) { mouseOnBall.z = Math.sqrt( 1.0 - length*length ); } else { mouseOnBall.z = .5 / length; } } else if ( length > 1.0 ) { mouseOnBall.normalize(); } else { mouseOnBall.z = Math.sqrt( 1.0 - length * length ); } _eye.copy( _this.object.position ).sub( _this.target ); vector.copy( _this.object.up ).setLength( mouseOnBall.y ) vector.add( objectUp.copy( _this.object.up ).cross( _eye ).setLength( mouseOnBall.x ) ); vector.add( _eye.setLength( mouseOnBall.z ) ); return vector; }; }() ); this.rotateCamera = (function(){ var axis = new THREE.Vector3(), quaternion = new THREE.Quaternion(); return function () { var angle = Math.acos( _rotateStart.dot( _rotateEnd ) / _rotateStart.length() / _rotateEnd.length() ); if ( angle ) { axis.crossVectors( _rotateStart, _rotateEnd ).normalize(); angle *= _this.rotateSpeed; quaternion.setFromAxisAngle( axis, -angle ); _eye.applyQuaternion( quaternion ); _this.object.up.applyQuaternion( quaternion ); _rotateEnd.applyQuaternion( quaternion ); if ( _this.staticMoving ) { _rotateStart.copy( _rotateEnd ); } else { quaternion.setFromAxisAngle( axis, angle * ( _this.dynamicDampingFactor - 1.0 ) ); _rotateStart.applyQuaternion( quaternion ); } } } }()); this.zoomCamera = function () { if ( _state === STATE.TOUCH_ZOOM_PAN ) { var factor = _touchZoomDistanceStart / _touchZoomDistanceEnd; _touchZoomDistanceStart = _touchZoomDistanceEnd; _eye.multiplyScalar( factor ); } else { var factor = 1.0 + ( _zoomEnd.y - _zoomStart.y ) * _this.zoomSpeed; if ( factor !== 1.0 && factor > 0.0 ) { _eye.multiplyScalar( factor ); if ( _this.staticMoving ) { _zoomStart.copy( _zoomEnd ); } else { _zoomStart.y += ( _zoomEnd.y - _zoomStart.y ) * this.dynamicDampingFactor; } } } }; this.panCamera = (function(){ var mouseChange = new THREE.Vector2(), objectUp = new THREE.Vector3(), pan = new THREE.Vector3(); return function () { mouseChange.copy( _panEnd ).sub( _panStart ); if ( mouseChange.lengthSq() ) { mouseChange.multiplyScalar( _eye.length() * _this.panSpeed ); pan.copy( _eye ).cross( _this.object.up ).setLength( mouseChange.x ); pan.add( objectUp.copy( _this.object.up ).setLength( mouseChange.y ) ); _this.object.position.add( pan ); _this.target.add( pan ); if ( _this.staticMoving ) { _panStart.copy( _panEnd ); } else { _panStart.add( mouseChange.subVectors( _panEnd, _panStart ).multiplyScalar( _this.dynamicDampingFactor ) ); } } } }()); this.checkDistances = function () { if ( !_this.noZoom || !_this.noPan ) { if ( _eye.lengthSq() > _this.maxDistance * _this.maxDistance ) { _this.object.position.addVectors( _this.target, _eye.setLength( _this.maxDistance ) ); } if ( _eye.lengthSq() < _this.minDistance * _this.minDistance ) { _this.object.position.addVectors( _this.target, _eye.setLength( _this.minDistance ) ); } } }; this.update = function () { _eye.subVectors( _this.object.position, _this.target ); if ( !_this.noRotate ) { _this.rotateCamera(); } if ( !_this.noZoom ) { _this.zoomCamera(); } if ( !_this.noPan ) { _this.panCamera(); } _this.object.position.addVectors( _this.target, _eye ); _this.checkDistances(); _this.object.lookAt( _this.target ); if ( lastPosition.distanceToSquared( _this.object.position ) > EPS ) { _this.dispatchEvent( changeEvent ); lastPosition.copy( _this.object.position ); } }; this.reset = function () { _state = STATE.NONE; _prevState = STATE.NONE; _this.target.copy( _this.target0 ); _this.object.position.copy( _this.position0 ); _this.object.up.copy( _this.up0 ); _eye.subVectors( _this.object.position, _this.target ); _this.object.lookAt( _this.target ); _this.dispatchEvent( changeEvent ); lastPosition.copy( _this.object.position ); }; // listeners function keydown( event ) { if ( _this.enabled === false ) return; window.removeEventListener( 'keydown', keydown ); _prevState = _state; if ( _state !== STATE.NONE ) { return; } else if ( event.keyCode === _this.keys[ STATE.ROTATE ] && !_this.noRotate ) { _state = STATE.ROTATE; } else if ( event.keyCode === _this.keys[ STATE.ZOOM ] && !_this.noZoom ) { _state = STATE.ZOOM; } else if ( event.keyCode === _this.keys[ STATE.PAN ] && !_this.noPan ) { _state = STATE.PAN; } } function keyup( event ) { if ( _this.enabled === false ) return; _state = _prevState; window.addEventListener( 'keydown', keydown, false ); } function mousedown( event ) { if ( _this.enabled === false ) return; event.preventDefault(); event.stopPropagation(); if ( _state === STATE.NONE ) { _state = event.button; } if ( _state === STATE.ROTATE && !_this.noRotate ) { _rotateStart.copy( getMouseProjectionOnBall( event.pageX, event.pageY ) ); _rotateEnd.copy( _rotateStart ); } else if ( _state === STATE.ZOOM && !_this.noZoom ) { _zoomStart.copy( getMouseOnScreen( event.pageX, event.pageY ) ); _zoomEnd.copy(_zoomStart); } else if ( _state === STATE.PAN && !_this.noPan ) { _panStart.copy( getMouseOnScreen( event.pageX, event.pageY ) ); _panEnd.copy(_panStart) } document.addEventListener( 'mousemove', mousemove, false ); document.addEventListener( 'mouseup', mouseup, false ); _this.dispatchEvent( startEvent ); } function mousemove( event ) { if ( _this.enabled === false ) return; event.preventDefault(); event.stopPropagation(); if ( _state === STATE.ROTATE && !_this.noRotate ) { _rotateEnd.copy( getMouseProjectionOnBall( event.pageX, event.pageY ) ); } else if ( _state === STATE.ZOOM && !_this.noZoom ) { _zoomEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) ); } else if ( _state === STATE.PAN && !_this.noPan ) { _panEnd.copy( getMouseOnScreen( event.pageX, event.pageY ) ); } } function mouseup( event ) { if ( _this.enabled === false ) return; event.preventDefault(); event.stopPropagation(); _state = STATE.NONE; document.removeEventListener( 'mousemove', mousemove ); document.removeEventListener( 'mouseup', mouseup ); _this.dispatchEvent( endEvent ); } function mousewheel( event ) { if ( _this.enabled === false ) return; event.preventDefault(); event.stopPropagation(); var delta = 0; if ( event.wheelDelta ) { // WebKit / Opera / Explorer 9 delta = event.wheelDelta / 40; } else if ( event.detail ) { // Firefox delta = - event.detail / 3; } _zoomStart.y += delta * 0.01; _this.dispatchEvent( startEvent ); _this.dispatchEvent( endEvent ); } function touchstart( event ) { if ( _this.enabled === false ) return; switch ( event.touches.length ) { case 1: _state = STATE.TOUCH_ROTATE; _rotateStart.copy( getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) ); _rotateEnd.copy( _rotateStart ); break; case 2: _state = STATE.TOUCH_ZOOM_PAN; var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX; var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY; _touchZoomDistanceEnd = _touchZoomDistanceStart = Math.sqrt( dx * dx + dy * dy ); var x = ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX ) / 2; var y = ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY ) / 2; _panStart.copy( getMouseOnScreen( x, y ) ); _panEnd.copy( _panStart ); break; default: _state = STATE.NONE; } _this.dispatchEvent( startEvent ); } function touchmove( event ) { if ( _this.enabled === false ) return; event.preventDefault(); event.stopPropagation(); switch ( event.touches.length ) { case 1: _rotateEnd.copy( getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) ); break; case 2: var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX; var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY; _touchZoomDistanceEnd = Math.sqrt( dx * dx + dy * dy ); var x = ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX ) / 2; var y = ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY ) / 2; _panEnd.copy( getMouseOnScreen( x, y ) ); break; default: _state = STATE.NONE; } } function touchend( event ) { if ( _this.enabled === false ) return; switch ( event.touches.length ) { case 1: _rotateEnd.copy( getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) ); _rotateStart.copy( _rotateEnd ); break; case 2: _touchZoomDistanceStart = _touchZoomDistanceEnd = 0; var x = ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX ) / 2; var y = ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY ) / 2; _panEnd.copy( getMouseOnScreen( x, y ) ); _panStart.copy( _panEnd ); break; } _state = STATE.NONE; _this.dispatchEvent( endEvent ); } this.domElement.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false ); this.domElement.addEventListener( 'mousedown', mousedown, false ); this.domElement.addEventListener( 'mousewheel', mousewheel, false ); this.domElement.addEventListener( 'DOMMouseScroll', mousewheel, false ); // firefox this.domElement.addEventListener( 'touchstart', touchstart, false ); this.domElement.addEventListener( 'touchend', touchend, false ); this.domElement.addEventListener( 'touchmove', touchmove, false ); window.addEventListener( 'keydown', keydown, false ); window.addEventListener( 'keyup', keyup, false ); this.handleResize(); // force an update at start this.update(); }; THREE.TrackballControls.prototype = Object.create( THREE.EventDispatcher.prototype );
时间: 2024-09-06 21:43:37