为什么重新发明轮子？我只是重复使用TrackballControls.js代码并根据需要对其进行修改，如果您不想按住并拖动鼠标旋转摄像头，则修改事件处理行为并默认启用旋转模式，就像我在这 - 脏 - codepen。
/**
* @author Eberhard Graether/http://egraether.com/
* @author Mark Lundin/http://mark-lundin.com
* @author Simone Manini/http://daron1337.github.io
* @author Luca Antiga/http://lantiga.github.io
*/
THREE.MyTrackballControls = 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.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.ROTATE,
_prevState = STATE.NONE,
_eye = new THREE.Vector3(),
_movePrev = new THREE.Vector2(),
_moveCurr = new THREE.Vector2(),
_lastAxis = new THREE.Vector3(),
_lastAngle = 0,
_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 getMouseOnScreen(pageX, pageY) {
vector.set(
(pageX - _this.screen.left)/_this.screen.width,
(pageY - _this.screen.top)/_this.screen.height
);
return vector;
};
}());
var getMouseOnCircle = (function() {
var vector = new THREE.Vector2();
return function getMouseOnCircle(pageX, pageY) {
vector.set(
((pageX - _this.screen.width * 0.5 - _this.screen.left)/(_this.screen.width * 0.5)),
((_this.screen.height + 2 * (_this.screen.top - pageY))/_this.screen.width) // screen.width intentional
);
return vector;
};
}());
this.rotateCamera = (function() {
var axis = new THREE.Vector3(),
quaternion = new THREE.Quaternion(),
eyeDirection = new THREE.Vector3(),
objectUpDirection = new THREE.Vector3(),
objectSidewaysDirection = new THREE.Vector3(),
moveDirection = new THREE.Vector3(),
angle;
return function rotateCamera() {
moveDirection.set(_moveCurr.x - _movePrev.x, _moveCurr.y - _movePrev.y, 0);
angle = moveDirection.length();
if (angle) {
_eye.copy(_this.object.position).sub(_this.target);
eyeDirection.copy(_eye).normalize();
objectUpDirection.copy(_this.object.up).normalize();
objectSidewaysDirection.crossVectors(objectUpDirection, eyeDirection).normalize();
objectUpDirection.setLength(_moveCurr.y - _movePrev.y);
objectSidewaysDirection.setLength(_moveCurr.x - _movePrev.x);
moveDirection.copy(objectUpDirection.add(objectSidewaysDirection));
axis.crossVectors(moveDirection, _eye).normalize();
angle *= _this.rotateSpeed;
quaternion.setFromAxisAngle(axis, angle);
_eye.applyQuaternion(quaternion);
_this.object.up.applyQuaternion(quaternion);
_lastAxis.copy(axis);
_lastAngle = angle;
} else if (! _this.staticMoving && _lastAngle) {
_lastAngle *= Math.sqrt(1.0 - _this.dynamicDampingFactor);
_eye.copy(_this.object.position).sub(_this.target);
quaternion.setFromAxisAngle(_lastAxis, _lastAngle);
_eye.applyQuaternion(quaternion);
_this.object.up.applyQuaternion(quaternion);
}
_movePrev.copy(_moveCurr);
};
}());
this.zoomCamera = function() {
var factor;
if (_state === STATE.TOUCH_ZOOM_PAN) {
factor = _touchZoomDistanceStart/_touchZoomDistanceEnd;
_touchZoomDistanceStart = _touchZoomDistanceEnd;
_eye.multiplyScalar(factor);
} else {
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 panCamera() {
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));
_zoomStart.copy(_zoomEnd);
}
if (_eye.lengthSq() < _this.minDistance * _this.minDistance) {
_this.object.position.addVectors(_this.target, _eye.setLength(_this.minDistance));
_zoomStart.copy(_zoomEnd);
}
}
};
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) {
_moveCurr.copy(getMouseOnCircle(event.pageX, event.pageY));
_movePrev.copy(_moveCurr);
} 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);
}
//added by default
//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) {
_movePrev.copy(_moveCurr);
_moveCurr.copy(getMouseOnCircle(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();
switch (event.deltaMode) {
case 2:
// Zoom in pages
_zoomStart.y -= event.deltaY * 0.025;
break;
case 1:
// Zoom in lines
_zoomStart.y -= event.deltaY * 0.01;
break;
default:
// undefined, 0, assume pixels
_zoomStart.y -= event.deltaY * 0.00025;
break;
}
_this.dispatchEvent(startEvent);
_this.dispatchEvent(endEvent);
}
function touchstart(event) {
if (_this.enabled === false) return;
switch (event.touches.length) {
case 1:
_state = STATE.TOUCH_ROTATE;
_moveCurr.copy(getMouseOnCircle(event.touches[ 0 ].pageX, event.touches[ 0 ].pageY));
_movePrev.copy(_moveCurr);
break;
default: // 2 or more
_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;
}
_this.dispatchEvent(startEvent);
}
function touchmove(event) {
if (_this.enabled === false) return;
event.preventDefault();
event.stopPropagation();
switch (event.touches.length) {
case 1:
_movePrev.copy(_moveCurr);
_moveCurr.copy(getMouseOnCircle(event.touches[ 0 ].pageX, event.touches[ 0 ].pageY));
break;
default: // 2 or more
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;
}
}
function touchend(event) {
if (_this.enabled === false) return;
switch (event.touches.length) {
case 0:
_state = STATE.NONE;
break;
case 1:
_state = STATE.TOUCH_ROTATE;
_moveCurr.copy(getMouseOnCircle(event.touches[ 0 ].pageX, event.touches[ 0 ].pageY));
_movePrev.copy(_moveCurr);
break;
}
_this.dispatchEvent(endEvent);
}
function contextmenu(event) {
if (_this.enabled === false) return;
event.preventDefault();
}
this.dispose = function() {
this.domElement.removeEventListener('contextmenu', contextmenu, false);
this.domElement.removeEventListener('mousedown', mousedown, false);
this.domElement.removeEventListener('wheel', mousewheel, false);
this.domElement.removeEventListener('touchstart', touchstart, false);
this.domElement.removeEventListener('touchend', touchend, false);
this.domElement.removeEventListener('touchmove', touchmove, false);
document.removeEventListener('mousemove', mousemove, false);
document.removeEventListener('mouseup', mouseup, false);
window.removeEventListener('keydown', keydown, false);
window.removeEventListener('keyup', keyup, false);
};
this.domElement.addEventListener('contextmenu', contextmenu, false);
this.domElement.addEventListener('mousedown', mousedown, false);
this.domElement.addEventListener('wheel', mousewheel, false);
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();
document.addEventListener('mousemove', mousemove, false);
document.addEventListener('mouseup', mouseup, false);
};
THREE.MyTrackballControls.prototype = Object.create(THREE.EventDispatcher.prototype);
THREE.MyTrackballControls.prototype.constructor = THREE.MyTrackballControls;
if (! Detector.webgl) Detector.addGetWebGLMessage();
var container, stats;
var camera, controls, scene, renderer;
var cross;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera(60, window.innerWidth/window.innerHeight, 1, 1000);
camera.position.z = 500;
controls = new THREE.MyTrackballControls(camera);
controls.rotateSpeed = 2.0;
controls.zoomSpeed = 1.2;
controls.panSpeed = 0.8;
controls.noPan = false;
controls.staticMoving = false;
controls.dynamicDampingFactor = 0.3;
controls.keys = [ 65, 83, 68 ];
controls.addEventListener( 'change', render);
// world
scene = new THREE.Scene();
scene.fog = new THREE.FogExp2(0xcccccc, 0.002);
var geometry = new THREE.CylinderGeometry(0, 10, 100, 16, 1);
var material = new THREE.MeshPhongMaterial({ color: 0xdddddd, specular: 0x009900, shininess: 30, shading: THREE.SmoothShading });
for (var i = 0; i < 200; i ++) {
var mesh = new THREE.Mesh(geometry, material);
mesh.position.x = (Math.random() - 0.5) * 500;
mesh.position.y = (Math.random() - 0.5) * 500;
mesh.position.z = (Math.random() - 0.5) * 500;
mesh.updateMatrix();
mesh.matrixAutoUpdate = false;
scene.add(mesh);
}
// lights
light = new THREE.DirectionalLight(0xffffff);
light.position.set(1, 1, 1);
scene.add(light);
light = new THREE.DirectionalLight(0x002288);
light.position.set(-1, -1, -1);
scene.add(light);
light = new THREE.AmbientLight(0x222222);
scene.add(light);
renderer = new THREE.WebGLRenderer({ antialias: false });
renderer.setClearColor(scene.fog.color);
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
container = document.getElementById('container');
container.appendChild(renderer.domElement);
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
stats.domElement.style.zIndex = 100;
container.appendChild(stats.domElement);
//
window.addEventListener('resize', onWindowResize, false);
//
render();
}
function onWindowResize() {
camera.aspect = window.innerWidth/window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
controls.handleResize();
render();
}
function animate() {
requestAnimationFrame(animate);
controls.update();
}
function render() {
renderer.render(scene, camera);
stats.update();
}
我尝试此代码，我不断收到错误信息是说“无法读取的财产‘更新’：THREE.MyTrackballControls.render THREE.MyTrackballControls.dispatchEvent THREE.MyTrackballControls.update” –
的工作活生生的例子是在我创建的codepen链接中提供的......不仅如此，这很难做到：https://codepen.io/leefsmp/pen/zEvaBK –