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