1 // This file is part of Eigen, a lightweight C++ template library
2 // for linear algebra.
3 //
4 // Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
5 //
6 // This Source Code Form is subject to the terms of the Mozilla
7 // Public License v. 2.0. If a copy of the MPL was not distributed
8 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9 
10 #ifndef EIGEN_TRACKBALL_H
11 #define EIGEN_TRACKBALL_H
12 
13 #include <Eigen/Geometry>
14 
15 class Camera;
16 
17 class Trackball
18 {
19   public:
20 
21     enum Mode {Around, Local};
22 
Trackball()23     Trackball() : mpCamera(0) {}
24 
25     void start(Mode m = Around) { mMode = m; mLastPointOk = false; }
26 
setCamera(Camera * pCam)27     void setCamera(Camera* pCam) { mpCamera = pCam; }
28 
29     void track(const Eigen::Vector2i& newPoint2D);
30 
31   protected:
32 
33     bool mapToSphere( const Eigen::Vector2i& p2, Eigen::Vector3f& v3);
34 
35     Camera* mpCamera;
36     Eigen::Vector3f mLastPoint3D;
37     Mode mMode;
38     bool mLastPointOk;
39 
40 };
41 
42 #endif // EIGEN_TRACKBALL_H
43