608 lines
12 KiB
JavaScript
Executable File
608 lines
12 KiB
JavaScript
Executable File
/**
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* @author Eberhard Graether / http://egraether.com/
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* @author Mark Lundin / http://mark-lundin.com
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*/
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THREE.TrackballControls = function ( object, domElement ) {
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var _this = this;
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var STATE = { NONE: -1, ROTATE: 0, ZOOM: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_ZOOM: 4, TOUCH_PAN: 5 };
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this.object = object;
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this.domElement = ( domElement !== undefined ) ? domElement : document;
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// API
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this.enabled = true;
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this.screen = { left: 0, top: 0, width: 0, height: 0 };
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this.rotateSpeed = 1.0;
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this.zoomSpeed = 1.2;
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this.panSpeed = 0.3;
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this.noRotate = false;
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this.noZoom = false;
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this.noPan = false;
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this.noRoll = true;
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this.staticMoving = true;
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this.dynamicDampingFactor = 0.2;
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this.minDistance = 0;
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this.maxDistance = Infinity;
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this.keys = [ 65 /*A*/, 83 /*S*/, 68 /*D*/ ];
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// internals
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this.target = new THREE.Vector3();
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var lastPosition = new THREE.Vector3();
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var _state = STATE.NONE,
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_prevState = STATE.NONE,
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_eye = new THREE.Vector3(),
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_rotateStart = new THREE.Vector3(),
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_rotateEnd = new THREE.Vector3(),
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_zoomStart = new THREE.Vector2(),
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_zoomEnd = new THREE.Vector2(),
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_touchZoomDistanceStart = 0,
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_touchZoomDistanceEnd = 0,
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_panStart = new THREE.Vector2(),
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_panEnd = new THREE.Vector2();
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// for reset
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this.target0 = this.target.clone();
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this.position0 = this.object.position.clone();
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this.up0 = this.object.up.clone();
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// events
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var changeEvent = { type: 'change' };
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var startEvent = { type: 'start'};
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var endEvent = { type: 'end'};
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// methods
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this.handleResize = function () {
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if ( this.domElement === document ) {
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this.screen.left = 0;
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this.screen.top = 0;
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this.screen.width = window.innerWidth;
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this.screen.height = window.innerHeight;
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} else {
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this.screen = this.domElement.getBoundingClientRect();
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// adjustments come from similar code in the jquery offset() function
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var d = this.domElement.ownerDocument.documentElement
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this.screen.left += window.pageXOffset - d.clientLeft
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this.screen.top += window.pageYOffset - d.clientTop
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}
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};
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this.handleEvent = function ( event ) {
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if ( typeof this[ event.type ] == 'function' ) {
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this[ event.type ]( event );
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}
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};
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this.getMouseOnScreen = function ( pageX, pageY, vector ) {
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return vector.set(
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( pageX - _this.screen.left ) / _this.screen.width,
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( pageY - _this.screen.top ) / _this.screen.height
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);
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};
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this.getMouseProjectionOnBall = (function(){
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var objectUp = new THREE.Vector3(),
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mouseOnBall = new THREE.Vector3();
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return function ( pageX, pageY, projection ) {
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mouseOnBall.set(
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( pageX - _this.screen.width * 0.5 - _this.screen.left ) / (_this.screen.width*.5),
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( _this.screen.height * 0.5 + _this.screen.top - pageY ) / (_this.screen.height*.5),
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0.0
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);
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var length = mouseOnBall.length();
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if ( _this.noRoll ) {
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if ( length < Math.SQRT1_2 ) {
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mouseOnBall.z = Math.sqrt( 1.0 - length*length );
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} else {
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mouseOnBall.z = .5 / length;
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}
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} else if ( length > 1.0 ) {
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mouseOnBall.normalize();
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} else {
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mouseOnBall.z = Math.sqrt( 1.0 - length * length );
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}
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_eye.copy( _this.object.position ).sub( _this.target );
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projection.copy( _this.object.up ).setLength( mouseOnBall.y )
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projection.add( objectUp.copy( _this.object.up ).cross( _eye ).setLength( mouseOnBall.x ) );
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projection.add( _eye.setLength( mouseOnBall.z ) );
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return projection;
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}
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}());
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this.rotateCamera = (function(){
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var axis = new THREE.Vector3(),
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quaternion = new THREE.Quaternion();
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return function () {
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var angle = Math.acos( _rotateStart.dot( _rotateEnd ) / _rotateStart.length() / _rotateEnd.length() );
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if ( angle ) {
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axis.crossVectors( _rotateStart, _rotateEnd ).normalize();
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angle *= _this.rotateSpeed;
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quaternion.setFromAxisAngle( axis, -angle );
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_eye.applyQuaternion( quaternion );
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_this.object.up.applyQuaternion( quaternion );
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_rotateEnd.applyQuaternion( quaternion );
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if ( _this.staticMoving ) {
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_rotateStart.copy( _rotateEnd );
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} else {
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quaternion.setFromAxisAngle( axis, angle * ( _this.dynamicDampingFactor - 1.0 ) );
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_rotateStart.applyQuaternion( quaternion );
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}
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}
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}
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}());
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this.zoomCamera = function () {
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if ( _state === STATE.TOUCH_ZOOM ) {
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var factor = _touchZoomDistanceStart / _touchZoomDistanceEnd;
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_touchZoomDistanceStart = _touchZoomDistanceEnd;
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_eye.multiplyScalar( factor );
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} else {
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var factor = 1.0 + ( _zoomEnd.y - _zoomStart.y ) * _this.zoomSpeed;
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if ( factor !== 1.0 && factor > 0.0 ) {
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_eye.multiplyScalar( factor );
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if ( _this.staticMoving ) {
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_zoomStart.copy( _zoomEnd );
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} else {
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_zoomStart.y += ( _zoomEnd.y - _zoomStart.y ) * this.dynamicDampingFactor;
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}
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}
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}
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};
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this.panCamera = (function(){
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var mouseChange = new THREE.Vector2(),
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objectUp = new THREE.Vector3(),
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pan = new THREE.Vector3();
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return function () {
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mouseChange.copy( _panEnd ).sub( _panStart );
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if ( mouseChange.lengthSq() ) {
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mouseChange.multiplyScalar( _eye.length() * _this.panSpeed );
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pan.copy( _eye ).cross( _this.object.up ).setLength( mouseChange.x );
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pan.add( objectUp.copy( _this.object.up ).setLength( mouseChange.y ) );
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_this.object.position.add( pan );
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_this.target.add( pan );
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if ( _this.staticMoving ) {
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_panStart.copy( _panEnd );
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} else {
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_panStart.add( mouseChange.subVectors( _panEnd, _panStart ).multiplyScalar( _this.dynamicDampingFactor ) );
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}
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}
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}
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}());
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this.checkDistances = function () {
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if ( !_this.noZoom || !_this.noPan ) {
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if ( _eye.lengthSq() > _this.maxDistance * _this.maxDistance ) {
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_this.object.position.addVectors( _this.target, _eye.setLength( _this.maxDistance ) );
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}
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if ( _eye.lengthSq() < _this.minDistance * _this.minDistance ) {
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_this.object.position.addVectors( _this.target, _eye.setLength( _this.minDistance ) );
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}
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}
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};
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this.update = function () {
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var old = new THREE.Vector3();
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old.copy(_this.object.position);
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_eye.subVectors( _this.object.position, _this.target );
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if ( !_this.noRotate ) {
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_this.rotateCamera();
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}
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if ( !_this.noZoom ) {
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_this.zoomCamera();
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}
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if ( !_this.noPan ) {
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_this.panCamera();
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}
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_this.object.position.addVectors( _this.target, _eye );
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// HACKERBOTS CHANGES
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// Up is always up
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_this.object.up.copy( _this.up0 );
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// Stay above ground
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if (_this.object.position.z <= 20){
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_this.object.position.copy(old);
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}
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if (_this.object.position.z >= 500){
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_this.object.position.copy(old);
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}
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// END HACKERBOTS
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_this.checkDistances();
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_this.object.lookAt( _this.target );
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if ( lastPosition.distanceToSquared( _this.object.position ) > 0 ) {
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_this.dispatchEvent( changeEvent );
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lastPosition.copy( _this.object.position );
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}
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};
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this.reset = function () {
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_state = STATE.NONE;
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_prevState = STATE.NONE;
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_this.target.copy( _this.target0 );
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_this.object.position.copy( _this.position0 );
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_this.object.up.copy( _this.up0 );
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_eye.subVectors( _this.object.position, _this.target );
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_this.object.lookAt( _this.target );
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_this.dispatchEvent( changeEvent );
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lastPosition.copy( _this.object.position );
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};
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// listeners
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function keydown( event ) {
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if ( _this.enabled === false ) return;
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window.removeEventListener( 'keydown', keydown );
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_prevState = _state;
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if ( _state !== STATE.NONE ) {
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return;
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} else if ( event.keyCode === _this.keys[ STATE.ROTATE ] && !_this.noRotate ) {
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_state = STATE.ROTATE;
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} else if ( event.keyCode === _this.keys[ STATE.ZOOM ] && !_this.noZoom ) {
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_state = STATE.ZOOM;
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} else if ( event.keyCode === _this.keys[ STATE.PAN ] && !_this.noPan ) {
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_state = STATE.PAN;
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}
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}
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function keyup( event ) {
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if ( _this.enabled === false ) return;
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_state = _prevState;
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window.addEventListener( 'keydown', keydown, false );
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}
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function mousedown( event ) {
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if ( _this.enabled === false ) return;
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event.preventDefault();
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event.stopPropagation();
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if ( _state === STATE.NONE ) {
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_state = event.button;
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}
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if ( _state === STATE.ROTATE && !_this.noRotate ) {
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_this.getMouseProjectionOnBall( event.pageX, event.pageY, _rotateStart );
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_rotateEnd.copy(_rotateStart)
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} else if ( _state === STATE.ZOOM && !_this.noZoom ) {
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_this.getMouseOnScreen( event.pageX, event.pageY, _zoomStart );
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_zoomEnd.copy(_zoomStart);
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} else if ( _state === STATE.PAN && !_this.noPan ) {
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_this.getMouseOnScreen( event.pageX, event.pageY, _panStart );
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_panEnd.copy(_panStart)
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}
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document.addEventListener( 'mousemove', mousemove, false );
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document.addEventListener( 'mouseup', mouseup, false );
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_this.dispatchEvent( startEvent );
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}
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function mousemove( event ) {
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if ( _this.enabled === false ) return;
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event.preventDefault();
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event.stopPropagation();
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if ( _state === STATE.ROTATE && !_this.noRotate ) {
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_this.getMouseProjectionOnBall( event.pageX, event.pageY, _rotateEnd );
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} else if ( _state === STATE.ZOOM && !_this.noZoom ) {
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_this.getMouseOnScreen( event.pageX, event.pageY, _zoomEnd );
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} else if ( _state === STATE.PAN && !_this.noPan ) {
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_this.getMouseOnScreen( event.pageX, event.pageY, _panEnd );
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}
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}
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function mouseup( event ) {
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if ( _this.enabled === false ) return;
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event.preventDefault();
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event.stopPropagation();
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_state = STATE.NONE;
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document.removeEventListener( 'mousemove', mousemove );
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document.removeEventListener( 'mouseup', mouseup );
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_this.dispatchEvent( endEvent );
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}
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function mousewheel( event ) {
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if ( _this.enabled === false ) return;
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event.preventDefault();
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event.stopPropagation();
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var delta = 0;
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if ( event.wheelDelta ) { // WebKit / Opera / Explorer 9
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delta = event.wheelDelta / 40;
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} else if ( event.detail ) { // Firefox
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delta = - event.detail / 3;
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}
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_zoomStart.y += delta * 0.01;
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_this.dispatchEvent( startEvent );
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_this.dispatchEvent( endEvent );
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}
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function touchstart( event ) {
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if ( _this.enabled === false ) return;
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switch ( event.touches.length ) {
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case 1:
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_state = STATE.TOUCH_ROTATE;
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_rotateEnd.copy( _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY, _rotateStart ));
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break;
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case 2:
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_state = STATE.TOUCH_ZOOM;
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var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
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var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
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_touchZoomDistanceEnd = _touchZoomDistanceStart = Math.sqrt( dx * dx + dy * dy );
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break;
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case 3:
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_state = STATE.TOUCH_PAN;
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_panEnd.copy( _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY, _panStart ));
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break;
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default:
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_state = STATE.NONE;
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}
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_this.dispatchEvent( startEvent );
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}
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function touchmove( event ) {
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if ( _this.enabled === false ) return;
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event.preventDefault();
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event.stopPropagation();
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switch ( event.touches.length ) {
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case 1:
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_this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY, _rotateEnd );
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break;
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case 2:
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var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
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var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
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_touchZoomDistanceEnd = Math.sqrt( dx * dx + dy * dy )
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break;
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case 3:
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_this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY, _panEnd );
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break;
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default:
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_state = STATE.NONE;
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}
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}
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function touchend( event ) {
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if ( _this.enabled === false ) return;
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switch ( event.touches.length ) {
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case 1:
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_rotateStart.copy( _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY, _rotateEnd ));
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break;
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case 2:
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_touchZoomDistanceStart = _touchZoomDistanceEnd = 0;
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break;
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case 3:
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_panStart.copy( _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY, _panEnd ));
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break;
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}
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_state = STATE.NONE;
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_this.dispatchEvent( endEvent );
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}
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this.domElement.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false );
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this.domElement.addEventListener( 'mousedown', mousedown, false );
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this.domElement.addEventListener( 'mousewheel', mousewheel, false );
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this.domElement.addEventListener( 'DOMMouseScroll', mousewheel, false ); // firefox
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this.domElement.addEventListener( 'touchstart', touchstart, false );
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this.domElement.addEventListener( 'touchend', touchend, false );
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this.domElement.addEventListener( 'touchmove', touchmove, false );
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window.addEventListener( 'keydown', keydown, false );
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window.addEventListener( 'keyup', keyup, false );
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this.handleResize();
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};
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THREE.TrackballControls.prototype = Object.create( THREE.EventDispatcher.prototype );
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