/**************************************************************************** Copyright (c) 2018 GeometryFactory Sarl (France). Copyright (C) 2002-2014 Gilles Debunne. All rights reserved. This file is part of a fork of the QGLViewer library version 2.7.0. *****************************************************************************/ // $URL: https://github.com/CGAL/cgal/blob/v5.1/GraphicsView/include/CGAL/Qt/manipulatedCameraFrame.h $ // $Id: manipulatedCameraFrame.h 1ef976e 2019-10-19T16:09:56+02:00 Sébastien Loriot // SPDX-License-Identifier: GPL-3.0-only #ifndef QGLVIEWER_MANIPULATED_CAMERA_FRAME_H #define QGLVIEWER_MANIPULATED_CAMERA_FRAME_H #include #include #include #include namespace CGAL{ namespace qglviewer { /*! \brief The ManipulatedCameraFrame class represents a ManipulatedFrame with Camera specific mouse bindings. \class ManipulatedCameraFrame manipulatedCameraFrame.h CGAL::QGLViewer/manipulatedCameraFrame.h A ManipulatedCameraFrame is a specialization of a ManipulatedFrame, designed to be set as the Camera::frame(). Mouse motions are basically interpreted in a negated way: when the mouse goes to the right, the ManipulatedFrame translation goes to the right, while the ManipulatedCameraFrame has to go to the \e left, so that the \e scene seems to move to the right. A ManipulatedCameraFrame rotates around its pivotPoint(), which corresponds to the associated Camera::pivotPoint(). A ManipulatedCameraFrame can also "fly" in the scene. It basically moves forward, and turns according to the mouse motion. See flySpeed(), sceneUpVector() and the MOVE_FORWARD and MOVE_BACKWARD MouseAction. See the mouse page for a description of the possible actions that can be performed using the mouse and their bindings. \nosubgrouping */ class CGAL_QT_EXPORT ManipulatedCameraFrame : public ManipulatedFrame { #ifndef DOXYGEN friend class Camera; friend class ::CGAL::QGLViewer; #endif Q_OBJECT public: ManipulatedCameraFrame(); /*! Virtual destructor. Empty. */ virtual ~ManipulatedCameraFrame() {} ManipulatedCameraFrame(const ManipulatedCameraFrame &mcf); ManipulatedCameraFrame &operator=(const ManipulatedCameraFrame &mcf); /*! @name Pivot point */ //@{ public: /*! Returns the point the ManipulatedCameraFrame pivot point, around which the camera rotates. It is defined in the world coordinate system. Default value is (0,0,0). When the ManipulatedCameraFrame is associated to a Camera, Camera::pivotPoint() also returns this value. This point can interactively be changed using the mouse (see Camera::setPivotPointFromPixel() and RAP_FROM_PIXEL and RAP_IS_CENTER in the mouse page). */ Vec pivotPoint() const { return pivotPoint_; } /*! Sets the pivotPoint(), defined in the world coordinate system. */ void setPivotPoint(const Vec &point) { pivotPoint_ = point; } //@} /*! @name Camera manipulation */ //@{ public: /*! Returns \c true when the frame's rotation is constrained around the sceneUpVector(), and \c false otherwise, when the rotation is completely free (default). In free mode, the associated camera can be arbitrarily rotated in the scene, along its three axis, thus possibly leading to any arbitrary orientation. When you setRotatesAroundUpVector() to \c true, the sceneUpVector() defines a 'vertical' direction around which the camera rotates. The camera can rotate left or right, around this axis. It can also be moved up or down to show the 'top' and 'bottom' views of the scene. As a result, the sceneUpVector() will always appear vertical in the scene, and the horizon is preserved and stays projected along the camera's horizontal axis. Note that setting this value to \c true when the sceneUpVector() is not already vertically projected will break these invariants. It will also limit the possible movement of the camera, possibly up to a lock when the sceneUpVector() is projected horizontally. Use Camera::setUpVector() to define the sceneUpVector() and align the camera before calling this method to ensure this does not happen. */ bool rotatesAroundUpVector() const { return rotatesAroundUpVector_; } /*! Sets the value of rotatesAroundUpVector(). Default value is false (free rotation). */ void setRotatesAroundUpVector(bool constrained) { rotatesAroundUpVector_ = constrained; } /*! Returns whether or not the ZOOM action zooms on the pivot point. When set to \c false (default), a zoom action will move the camera along its Camera::viewDirection(), i.e. back and forth along a direction perpendicular to the projection screen. setZoomsOnPivotPoint() to \c true will move the camera along an axis defined by the Camera::pivotPoint() and its current position instead. As a result, the projected position of the pivot point on screen will stay the same during a zoom. */ bool zoomsOnPivotPoint() const { return zoomsOnPivotPoint_; } /*! Sets the value of zoomsOnPivotPoint(). Default value is false. */ void setZoomsOnPivotPoint(bool enabled) { zoomsOnPivotPoint_ = enabled; } private: #ifndef DOXYGEN void zoom(qreal delta, const Camera *const camera); #endif //@} /*! @name Fly parameters */ //@{ public Q_SLOTS: /*! Sets the flySpeed(), defined in OpenGL units. Default value is 0.0, but it is modified according to the CGAL::QGLViewer::sceneRadius() when the ManipulatedCameraFrame is set as the Camera::frame(). */ void setFlySpeed(qreal speed) { flySpeed_ = speed; } /*! Sets the sceneUpVector(), defined in the world coordinate system. Default value is (0,1,0), but it is updated by the Camera when this object is set as its Camera::frame(). Using Camera::setUpVector() instead is probably a better solution. */ void setSceneUpVector(const Vec &up) { sceneUpVector_ = up; } public: /*! Returns the fly speed, expressed in OpenGL units. It corresponds to the incremental displacement that is periodically applied to the ManipulatedCameraFrame position when a MOVE_FORWARD or MOVE_BACKWARD MouseAction is proceeded. \attention When the ManipulatedCameraFrame is set as the Camera::frame(), this value is set according to the CGAL::QGLViewer::sceneRadius() by CGAL::QGLViewer::setSceneRadius(). */ qreal flySpeed() const { return flySpeed_; } /*! Returns the up vector of the scene, expressed in the world coordinate system. In 'fly mode' (corresponding to the MOVE_FORWARD and MOVE_BACKWARD MouseAction bindings), horizontal displacements of the mouse rotate the ManipulatedCameraFrame around this vector. Vertical displacements rotate always around the Camera \c X axis. This value is also used when setRotationIsConstrained() is set to \c true to define the up vector (and incidentally the 'horizon' plane) around which the camera will rotate. Default value is (0,1,0), but it is updated by the Camera when this object is set as its Camera::frame(). Camera::setOrientation() and Camera::setUpVector()) direclty modify this value and should be used instead. */ Vec sceneUpVector() const { return sceneUpVector_; } #ifndef DOXYGEN Vec flyUpVector() const; void setFlyUpVector(const Vec &up); #endif //@} /*! @name Mouse event handlers */ //@{ protected: virtual void mouseReleaseEvent(QMouseEvent *const event, Camera *const camera); virtual void mouseMoveEvent(QMouseEvent *const event, Camera *const camera); virtual void wheelEvent(QWheelEvent *const event, Camera *const camera); //@} /*! @name Spinning */ //@{ protected Q_SLOTS: virtual void spin(); //@} /*! @name XML representation */ //@{ public: virtual QDomElement domElement(const QString &name, QDomDocument &document) const; public Q_SLOTS: virtual void initFromDOMElement(const QDomElement &element); //@} #ifndef DOXYGEN protected: virtual void startAction( int ma, bool withConstraint = true); // int is really a MouseAction #endif private Q_SLOTS: virtual void flyUpdate(); private: void updateSceneUpVector(); Quaternion turnQuaternion(int x, const Camera *const camera); Quaternion pitchYawQuaternion(int x, int y, const Camera *const camera); private: // Fly mode data qreal flySpeed_; qreal driveSpeed_; Vec sceneUpVector_; QTimer flyTimer_; bool rotatesAroundUpVector_; // Inverse the direction of an horizontal mouse motion. Depends on the // projected screen orientation of the vertical axis when the mouse button is // pressed. bool constrainedRotationIsReversed_; bool zoomsOnPivotPoint_; Vec pivotPoint_; }; }} // namespace CGAL::qglviewer #ifdef CGAL_HEADER_ONLY //#include #endif // CGAL_HEADER_ONLY #endif // QGLVIEWER_MANIPULATED_CAMERA_FRAME_H