Created a `TrackballControls` for `OrthographicCamera`

examples/js/controls/OrthographicTrackballControls.js

@@ -0,0 +1,560 @@
+/**
+ * @author Eberhard Graether / http://egraether.com/
+ * @author Patrick Fuller / http://patrick-fuller.com
+ */
+
+THREE.OrthographicTrackballControls = function ( object, domElement ) {
+
+	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 = { width: 0, height: 0, offsetLeft: 0, offsetTop: 0 };
+	this.radius = ( this.screen.width + this.screen.height ) / 4;
+
+	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 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(),
+	_zoomFactor = 1,
+
+	_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();
+
+	this.left0 = this.object.left;
+	this.right0 = this.object.right;
+	this.top0 = this.object.top;
+	this.bottom0 = this.object.bottom;
+	this.center0 = new THREE.Vector2((this.left0 + this.right0) / 2.0, (this.top0 + this.bottom0) / 2.0);
+
+	// events
+
+	var changeEvent = { type: 'change' };
+
+
+	// methods
+
+	this.handleResize = function () {
+
+		this.screen.width = window.innerWidth;
+		this.screen.height = window.innerHeight;
+
+		this.screen.offsetLeft = 0;
+		this.screen.offsetTop = 0;
+
+		this.radius = ( this.screen.width + this.screen.height ) / 4;
+
+	};
+
+	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.offsetLeft ) / _this.radius * 0.5,
+			( clientY - _this.screen.offsetTop ) / _this.radius * 0.5
+		);
+
+	};
+
+	this.getMouseProjectionOnBall = function ( clientX, clientY ) {
+
+		var mouseOnBall = new THREE.Vector3(
+			( clientX - _this.screen.width * 0.5 - _this.screen.offsetLeft ) / _this.radius,
+			( _this.screen.height * 0.5 + _this.screen.offsetTop - clientY ) / _this.radius,
+			0.0
+		);
+
+		var length = mouseOnBall.length();
+
+		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;
+			_zoomFactor *= factor;
+
+			_this.object.left = _zoomFactor * _this.left0 + ( 1 - _zoomFactor ) *  _this.center0.x;
+			_this.object.right = _zoomFactor * _this.right0 + ( 1 - _zoomFactor ) *  _this.center0.x;
+			_this.object.top = _zoomFactor * _this.top0 + ( 1 - _zoomFactor ) *  _this.center0.y;
+			_this.object.bottom = _zoomFactor * _this.bottom0 + ( 1 - _zoomFactor ) *  _this.center0.y;
+
+		} else {
+
+			var factor = 1.0 + ( _zoomEnd.y - _zoomStart.y ) * _this.zoomSpeed;
+
+			if ( factor !== 1.0 && factor > 0.0 ) {
+				_zoomFactor *= factor;
+
+				_this.object.left = _zoomFactor * _this.left0 + ( 1 - _zoomFactor ) *  _this.center0.x;
+				_this.object.right = _zoomFactor * _this.right0 + ( 1 - _zoomFactor ) *  _this.center0.x;
+				_this.object.top = _zoomFactor * _this.top0 + ( 1 - _zoomFactor ) *  _this.center0.y;
+				_this.object.bottom = _zoomFactor * _this.bottom0 + ( 1 - _zoomFactor ) *  _this.center0.y;
+
+				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 ( _this.object.position.lengthSq() > _this.maxDistance * _this.maxDistance ) {
+
+				_this.object.position.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();
+			_this.object.updateProjectionMatrix();
+
+		}
+
+		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.left = _this.left0;
+		_this.object.right = _this.right0;
+		_this.object.top = _this.top0;
+		_this.object.bottom = _this.bottom0;
+
+		_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 = _rotateEnd = _this.getMouseProjectionOnBall( event.clientX, event.clientY );
+
+		} else if ( _state === STATE.ZOOM && !_this.noZoom ) {
+
+			_zoomStart = _zoomEnd = _this.getMouseOnScreen( event.clientX, event.clientY );
+
+		} else if ( _state === STATE.PAN && !_this.noPan ) {
+
+			_panStart = _panEnd = _this.getMouseOnScreen( event.clientX, event.clientY );
+
+		}
+
+		document.addEventListener( 'mousemove', mousemove, false );
+		document.addEventListener( 'mouseup', mouseup, false );
+
+	}
+
+	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 );
+
+	}
+
+	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;
+
+	}
+
+	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;
+
+		}
+
+	}
+
+	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.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();
+
+};
+
+THREE.OrthographicTrackballControls.prototype = Object.create( THREE.EventDispatcher.prototype );

examples/js/controls/TrackballControls.js

@@ -194,19 +194,7 @@ THREE.TrackballControls = function ( object, domElement ) {
 
 			if ( factor !== 1.0 && factor > 0.0 ) {
 
-				if ( this.object instanceof THREE.PerspectiveCamera ) {
-
-					_eye.multiplyScalar( factor );
-
-				} else {
-
-					this.object.left *= factor;
-					this.object.right *= factor;
-					this.object.top *= factor;
-					this.object.bottom *= factor;
-
-					this.object.updateProjectionMatrix();
-				}
+				_eye.multiplyScalar( factor );
 
 				if ( _this.staticMoving ) {