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
15class Camera;
16
17class Trackball
18{
19  public:
20
21    enum Mode {Around, Local};
22
23    Trackball() : mpCamera(0) {}
24
25    void start(Mode m = Around) { mMode = m; mLastPointOk = false; }
26
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