/* 
   client/camera.h
   This file is part of the Osirion project and is distributed under 
   the terms and conditions of the GNU General Public License version 2 
*/

#ifndef __INCLUDED_CAMERA_H__
#define __INCLUDED_CAMERA_H__

#include "gl/osiriongl.h"

namespace client {

/// camera functions
/** The functions in this namespace performs the transformations
for the camera eye location. The camera always looks at (0,0,0)
*/
class Camera
{
public:
	Camera();
	~Camera();

	/// enum indicating the camera mode
	enum Mode {Free, Track};

	/// draw the OpenGL camera transformation
	void draw(float elapsed);

	/// rotate the camera left
	void rotate_left();
	/// rotate the camera right
	void rotate_right();
	/// rotate the camera up
	void rotate_up();
	/// rotate the camera down
	void rotate_down();

	/// switch to next camera mode
	void nextmode();
	
	/// camera target
	/** The location the camera is looking at */
	gl::Vector3f target;

	/// target yaw, angle in XZ plane, positive is looking left
	float yaw_target; 
	/// target pitch, angle in XZ plane, positive is looking left
	float pitch_target; 
	/// distance from the camera to the target
	float distance;
	/// current camera mode
	Mode mode;

protected:
	/// current yaw, angle in XZ plane, positive is looking left
	float yaw_current; 
	/// current pitch, angle in XY, positive is looking up
	float pitch_current; 
	/// default tracking pitch
	float pitch_track; 
	/// default offset increment
	float offset_inc; 
};

} // namespace client
	
#endif // __INCLUDED_CAMERA_H__