/**************************************************************************\ * * This file is part of the Coin 3D visualization library. * Copyright (C) 1998-2007 by Systems in Motion. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * ("GPL") version 2 as published by the Free Software Foundation. * See the file LICENSE.GPL at the root directory of this source * distribution for additional information about the GNU GPL. * * For using Coin with software that can not be combined with the GNU * GPL, and for taking advantage of the additional benefits of our * support services, please contact Systems in Motion about acquiring * a Coin Professional Edition License. * * See http://www.coin3d.org/ for more information. * * Systems in Motion, Postboks 1283, Pirsenteret, 7462 Trondheim, NORWAY. * http://www.sim.no/ sales@sim.no coin-support@coin3d.org * \**************************************************************************/ #ifdef HAVE_CONFIG_H #include #endif // HAVE_CONFIG_H #ifdef HAVE_VRML97 /*! \class SoVRMLSphereSensor SoVRMLSphereSensor.h Inventor/VRMLnodes/SoVRMLSphereSensor \brief The SoVRMLSphereSensor class maps pointer motion into rotations on a sphere. \ingroup VRMLnodes \WEB3DCOPYRIGHT \verbatim SphereSensor { exposedField SFBool autoOffset TRUE exposedField SFBool enabled TRUE exposedField SFRotation offset 0 1 0 0 # [-1,1],(-,) eventOut SFBool isActive eventOut SFRotation rotation_changed eventOut SFVec3f trackPoint_changed } \endverbatim The SphereSensor node maps pointing device motion into spherical rotation about the origin of the local coordinate system. The SphereSensor node uses the descendent geometry of its parent node to determine whether it is liable to generate events. The \e enabled exposed field enables and disables the SphereSensor node. If \e enabled is TRUE, the sensor reacts appropriately to user events. If \e enabled is FALSE, the sensor does not track user input or send events. If \e enabled receives a FALSE event and \e isActive is TRUE, the sensor becomes disabled and deactivated, and outputs an \e isActive FALSE event. If \e enabled receives a TRUE event the sensor is enabled and ready for user activation. The SphereSensor node generates events when the pointing device is activated while the pointer is indicating any descendent geometry nodes of the sensor's parent group. See 4.6.7.5, Activating and manipulating sensors (), for details on using the pointing device to activate the SphereSensor. Upon activation of the pointing device (e.g., mouse button down) over the sensor's geometry, an \e isActive TRUE event is sent. The vector defined by the initial point of intersection on the SphereSensor's geometry and the local origin determines the radius of the sphere that is used to map subsequent pointing device motion while dragging. The virtual sphere defined by this radius and the local origin at the time of activation is used to interpret subsequent pointing device motion and is not affected by any changes to the sensor's coordinate system while the sensor is active. For each position of the bearing, a rotation_changed event is sent which corresponds to the sum of the relative rotation from the original intersection point plus the offset value. trackPoint_changed events reflect the unclamped drag position on the surface of this sphere. When the pointing device is deactivated and autoOffset is TRUE, offset is set to the last rotation_changed value and an offset_changed event is generated. See 4.6.7.4, Drag sensors (), for more details. When the sensor generates an \e isActive TRUE event, it grabs all further motion events from the pointing device until it is released and generates an isActive FALSE event (other pointing-device sensors shall not generate events during this time). Motion of the pointing device while isActive is TRUE is termed a "drag". If a 2D pointing device is in use, isActive events will typically reflect the state of the primary button associated with the device (i.e., isActive is TRUE when the primary button is pressed and FALSE when it is released). If a 3D pointing device (e.g., wand) is in use, isActive events will typically reflect whether the pointer is within (or in contact with) the sensor's geometry. While the pointing device is activated, trackPoint_changed and rotation_changed events are output. trackPoint_changed events represent the unclamped intersection points on the surface of the invisible sphere. If the pointing device is dragged off the sphere while activated, browsers may interpret this in a variety of ways (e.g., clamp all values to the sphere or continue to rotate as the point is dragged away from the sphere). Each movement of the pointing device while \e isActive is TRUE generates \e trackPoint_changed and \e rotation_changed events. Further information about this behaviour can be found in 4.6.7.3 (), Pointing-device sensors, 4.6.7.4, Drag sensors (), and 4.6.7.5, Activating and manipulating sensors (). */ /*! \var SoSFRotation SoVRMLSphereSensor::offset The sensor rotation value. */ /*! \var SoSFRotation SoVRMLSphereSensor::rotation_changed An eventOut that is updated during interaction. Holds the differense between the current rotation and the sensor rotation value. */ #include #include #include #include SO_NODE_SOURCE(SoVRMLSphereSensor); // Doc in parent void SoVRMLSphereSensor::initClass(void) { SO_NODE_INTERNAL_INIT_CLASS(SoVRMLSphereSensor, SO_VRML97_NODE_TYPE); } /*! Constructor. */ SoVRMLSphereSensor::SoVRMLSphereSensor(void) { SO_VRMLNODE_INTERNAL_CONSTRUCTOR(SoVRMLSphereSensor); SO_VRMLNODE_ADD_EXPOSED_FIELD(offset, (0.0f, 1.0f, 0.0f, 0.0f)); SO_VRMLNODE_ADD_EVENT_OUT(rotation_changed); this->sphereproj = new SbSpherePlaneProjector; } /*! Destructor. */ SoVRMLSphereSensor::~SoVRMLSphereSensor() { delete this->sphereproj; } // Doc in parent SbBool SoVRMLSphereSensor::dragStart(void) { SbVec3f thehitpt = this->getLocalStartingPoint(); float radius = thehitpt.length(); if (radius == 0.0f) return FALSE; this->sphereproj->setSphere(SbSphere(SbVec3f(0.0f, 0.0f, 0.0f), radius)); this->sphereproj->setViewVolume(this->getViewVolume()); this->sphereproj->setWorkingSpace(this->getLocalToWorldMatrix()); this->getLocalToWorldMatrix().multVecMatrix(thehitpt, this->prevworldhitpt); this->prevrotation = SbRotation::identity(); this->rotation_changed = this->offset.getValue(); return TRUE; } // Doc in parent void SoVRMLSphereSensor::drag(void) { this->sphereproj->setViewVolume(this->getViewVolume()); this->sphereproj->setWorkingSpace(this->getLocalToWorldMatrix()); SbVec3f startpt; this->getWorldToLocalMatrix().multVecMatrix(this->prevworldhitpt, startpt); SbVec3f projpt = this->sphereproj->project(this->getNormalizedLocaterPosition()); this->getLocalToWorldMatrix().multVecMatrix(projpt, this->prevworldhitpt); SbRotation rot = this->sphereproj->getRotation(startpt, projpt); this->prevrotation *= rot; this->rotation_changed = this->prevrotation * this->offset.getValue(); } // Doc in parent void SoVRMLSphereSensor::dragFinish(void) { if (this->autoOffset.getValue()) { this->offset = this->rotation_changed.getValue(); } } #endif // HAVE_VRML97