/** \file move_listener.h
 * <File description>
 *
 * $Id: move_listener.h,v 1.2 2000/12/04 17:58:09 coutelas Exp $
 */

/* Copyright, 2000 Nevrax Ltd.
 *
 * This file is part of NEVRAX NEL.
 * NEVRAX NEL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.

 * NEVRAX NEL is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with NEVRAX NEL; see the file COPYING. If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#ifndef NL_MOVE_LISTENER_H
#define NL_MOVE_LISTENER_H

#include "nel/misc/types_nl.h"
#include "nel/misc/event_listener.h"
#include "nel/misc/matrix.h"
#include "nel/3d/viewport.h"
#include "nel/3d/scene.h"
#include "nel/3d/camera.h"



namespace NL3D 
{


/**
 * CMoveListener is a listener that handle a 3d matrix with mouse events.
 * \author Stephane Coutelas
 * \author Nevrax France
 * \date 2000
 */
class CMoveListener : public NLMISC::IEventListener
{
public:
	
	/** 
	 * TMoveMode. 
	 * moving modes
	 */
	enum TMoveMode
	{
		WALK,
		FREE
	};
	
	/** 
	 * Constructor. 
	 * You should call init then.
	 */
	CMoveListener();


	/** 
	 * Constructor. 
	 * You should call init then.
	 * \param scene the scene
	 * \param w screen width in pixels
	 * \param h screen height in pixels
	 * \param camera the camera
	 */
	void init(CScene * scene, uint w, uint h, const class CCamera& camera)
	{
		_Scene = scene;
		_Width = w;
		_Height = h;
		
		_Viewport = scene->getViewport();

		float dummy;
		_ViewMatrix = camera.getMatrix ();
		camera.getFrustum (_Left, _Right, _Bottom, _Top, _Depth, dummy);
	}

	/**
	 * Set the moving mode
	 * \param m the moving mode
	 */
	void setMode(TMoveMode m)
	{
		_Mode = m;
	}

	/** 
     * Register the listener to the server.
	 */
	void addToServer (NLMISC::CEventServer& server);

	/** 
	  * Unregister the listener to the server.
	  */
	void removeFromServer (NLMISC::CEventServer& server);
	

private:

	/// Internal use
	virtual void operator()(const NLMISC::CEvent& event);

	/// moving mode
	TMoveMode _Mode;
	
	/// view matrix
	NLMISC::CMatrix _ViewMatrix;

	/// viewport
	NL3D::CViewport	_Viewport;
	
	/// true if previous mouse move event was re-centering cursor
	bool _CursorReset;

	CScene * _Scene;
	
	/// screen width
	uint _Width;

	/// screen height
	uint _Height;

	///frustum parameters
	float _Top;
	float _Bottom;
	float _Left;
	float _Right;
	float _Depth;
	
	/// current position
	CVector _Pos;

	///current rotation z angle
	float _RotZ;

	///current rotation x angle
	float _RotX;
	
	/// step for translation
	static const float _StepTrans;

	/// step for rotation
	static const float _StepRot;

}; // NL3D

}

#endif // NL_MOVE_LISTENER_H

/* End of move_listener.h */