/**
* Control to freely move the camera around a target point. Rotates, zooms, pans.
*
* @namespace GIScene
* @class Control.Trackball
* @constructor
* @extends GIScene.Control
* @param {THREE.Camera} object The camera object to be used with this control
* @param {DOMElement} [domElement] The DOM Element to which the mouse events will be added
*
* @author Eberhard Graether / http://egraether.com/
* modified by m.auer
*/
GIScene.Control.Trackball = function ( object, domElement ) {
GIScene.Control.call( this );
var _this = this;
var STATE = { NONE: -1, ROTATE: 0, ZOOM: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_ZOOM: 4, TOUCH_PAN: 5 };
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;//1.0;
this.zoomSpeed = 1.2;
this.panSpeed = 0.3;
this.noRotate = false;
this.noZoom = false;
this.noPan = false;
this.noRoll = true;
this.staticMoving = true;
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 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 {
this.screen = this.domElement.getBoundingClientRect();
}
};
this.handleEvent = function ( event ) {
if ( typeof this[ event.type ] == 'function' ) {
this[ event.type ]( event );
}
};
this.getMouseOnScreen = function ( clientX, clientY ) {
return new THREE.Vector2(
( clientX - _this.screen.left ) / _this.screen.width,
( clientY - _this.screen.top ) / _this.screen.height
);
};
this.getMouseProjectionOnBall = function ( clientX, clientY ) {
var mouseOnBall = new THREE.Vector3(
( clientX - _this.screen.width * 0.5 - _this.screen.left ) / (_this.screen.width*.5),
( _this.screen.height * 0.5 + _this.screen.top - clientY ) / (_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 );
var projection = _this.object.up.clone().setLength( mouseOnBall.y );
projection.add( _this.object.up.clone().cross( _eye ).setLength( mouseOnBall.x ) );
projection.add( _eye.setLength( mouseOnBall.z ) );
return projection;
};
this.rotateCamera = function () {
var angle = Math.acos( _rotateStart.dot( _rotateEnd ) / _rotateStart.length() / _rotateEnd.length() );
if ( angle ) {
var axis = ( new THREE.Vector3() ).crossVectors( _rotateStart, _rotateEnd ).normalize(),
quaternion = new THREE.Quaternion();
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 ) {
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 = _panEnd.clone().sub( _panStart );
if ( mouseChange.lengthSq() ) {
mouseChange.multiplyScalar( _eye.length() * _this.panSpeed );
var pan = _eye.clone().cross( _this.object.up ).setLength( mouseChange.x );
pan.add( _this.object.up.clone().setLength( mouseChange.y ) );
_this.object.position.add( pan );
_this.target.add( pan );
if ( _this.staticMoving ) {
_panStart = _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 ) > 0 ) {
_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 = _this.getMouseProjectionOnBall( event.clientX, event.clientY );
_rotateEnd.copy(_rotateStart);
} else if ( _state === STATE.ZOOM && !_this.noZoom ) {
_zoomStart = _this.getMouseOnScreen( event.clientX, event.clientY );
_zoomEnd.copy(_zoomStart);
} else if ( _state === STATE.PAN && !_this.noPan ) {
_panStart = _this.getMouseOnScreen( event.clientX, event.clientY );
_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 = _this.getMouseProjectionOnBall( event.clientX, event.clientY );
} else if ( _state === STATE.ZOOM && !_this.noZoom ) {
_zoomEnd = _this.getMouseOnScreen( event.clientX, event.clientY );
} else if ( _state === STATE.PAN && !_this.noPan ) {
_panEnd = _this.getMouseOnScreen( event.clientX, event.clientY );
}
}
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 = _rotateEnd = _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
break;
case 2:
_state = STATE.TOUCH_ZOOM;
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 );
break;
case 3:
_state = STATE.TOUCH_PAN;
_panStart = _panEnd = _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
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 = _this.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 );
break;
case 3:
_panEnd = _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
break;
default:
_state = STATE.NONE;
}
}
function touchend( event ) {
if ( _this.enabled === false ) return;
switch ( event.touches.length ) {
case 1:
_rotateStart = _rotateEnd = _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
break;
case 2:
_touchZoomDistanceStart = _touchZoomDistanceEnd = 0;
break;
case 3:
_panStart = _panEnd = _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
break;
}
_state = STATE.NONE;
_this.dispatchEvent( endEvent );
}
var onCenter = function(event){
// var positionFromCenter = (event.content.positionFromCenter.length() < 0.01)? new THREE.Vector3(0,0,0.01) : event.content.positionFromCenter;
this.target = event.content.center;
// this.object.position = event.content.center.clone().add(positionFromCenter);
// this.object.target.position = positionFromCenter.clone().multiplyScalar(-1);
}.bind(this);
var onChange = function(event){
this.scene.center = event.target.target.clone();
this.object.target.position.setZ(-this.object.position.distanceTo(event.target.target));
//event.target.scene.setCenter(event.target.center);//, event.target.object.position.sub(event.target.center));
};
this.activate = function() {
if(this.isActive) return;
this.target = this.scene.center.clone();
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();
window.addEventListener( 'resize', this.handleResize, false );
this.addEventListener('change', onChange);
this.scene.addEventListener('center', onCenter);
//hang in render loop
this.scene.addEventListener("beforeRender", this.update);
GIScene.Control.prototype.activate.call(this);
};
this.deactivate = function() {
if(!this.isActive) return;
this.domElement.removeEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false );
this.domElement.removeEventListener( 'mousedown', mousedown, false );
this.domElement.removeEventListener( 'mousewheel', mousewheel, false );
this.domElement.removeEventListener( 'DOMMouseScroll', mousewheel, false ); // firefox
this.domElement.removeEventListener( 'touchstart', touchstart, false );
this.domElement.removeEventListener( 'touchend', touchend, false );
this.domElement.removeEventListener( 'touchmove', touchmove, false );
window.removeEventListener( 'keydown', keydown, false );
window.removeEventListener( 'keyup', keyup, false );
this.removeEventListener('change', onChange);
this.scene.removeEventListener('center', onCenter);
window.removeEventListener( 'resize', this.handleResize, false );
//hang in render loop
this.scene.removeEventListener("beforeRender", this.update);
GIScene.Control.prototype.deactivate.call(this);
};
};
GIScene.Control.Trackball.prototype = Object.create( GIScene.Control.prototype );
