trackball.h

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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
#ifndef EIGEN_TRACKBALL_H
#define EIGEN_TRACKBALL_H
 
#include <Eigen/Geometry>
 
class Camera;
 
class Trackball {
 public:
  enum Mode { Around, Local };
 
  Trackball() : mpCamera(0) {}
 
  void start(Mode m = Around) {
    mMode = m;
    mLastPointOk = false;
  }
 
  void setCamera(Camera* pCam) { mpCamera = pCam; }
 
  void track(const Eigen::Vector2i& newPoint2D);
 
 protected:
  bool mapToSphere(const Eigen::Vector2i& p2, Eigen::Vector3f& v3);
 
  Camera* mpCamera;
  Eigen::Vector3f mLastPoint3D;
  Mode mMode;
  bool mLastPointOk;
};
 
#endif  // EIGEN_TRACKBALL_H