00001 // This file is part of Eigen, a lightweight C++ template library 00002 // for linear algebra. 00003 // 00004 // Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr> 00005 // 00006 // Eigen is free software; you can redistribute it and/or 00007 // modify it under the terms of the GNU Lesser General Public 00008 // License as published by the Free Software Foundation; either 00009 // version 3 of the License, or (at your option) any later version. 00010 // 00011 // Alternatively, you can redistribute it and/or 00012 // modify it under the terms of the GNU General Public License as 00013 // published by the Free Software Foundation; either version 2 of 00014 // the License, or (at your option) any later version. 00015 // 00016 // Eigen is distributed in the hope that it will be useful, but WITHOUT ANY 00017 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 00018 // FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the 00019 // GNU General Public License for more details. 00020 // 00021 // You should have received a copy of the GNU Lesser General Public 00022 // License and a copy of the GNU General Public License along with 00023 // Eigen. If not, see <http://www.gnu.org/licenses/>. 00024 00025 #ifndef EIGEN_TRACKBALL_H 00026 #define EIGEN_TRACKBALL_H 00027 00028 #include <Eigen/Geometry> 00029 00030 class Camera; 00031 00032 class Trackball 00033 { 00034 public: 00035 00036 enum Mode {Around, Local}; 00037 00038 Trackball() : mpCamera(0) {} 00039 00040 void start(Mode m = Around) { mMode = m; mLastPointOk = false; } 00041 00042 void setCamera(Camera* pCam) { mpCamera = pCam; } 00043 00044 void track(const Eigen::Vector2i& newPoint2D); 00045 00046 protected: 00047 00048 bool mapToSphere( const Eigen::Vector2i& p2, Eigen::Vector3f& v3); 00049 00050 Camera* mpCamera; 00051 Eigen::Vector3f mLastPoint3D; 00052 Mode mMode; 00053 bool mLastPointOk; 00054 00055 }; 00056 00057 #endif // EIGEN_TRACKBALL_H