camera.h

/*--License:
        Lilith 3D Engine
        Copyright Lee Thomason (Grinning Lizard Software) 2002-2004
        www.grinninglizard.com/lilith

        This program 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
        of the License, or (at your option) any later version.

        This program 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 this program; if not, write to the Free Software
        Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

        The full text of the license can be found in license.txt
*/

#ifndef L3_CAMERA_INCLUDED
#define L3_CAMERA_INCLUDED

#include "../grinliz/glgeometry.h"
#include "../grinliz/glpublisher.h"
#include "worlddefine.h"

namespace lilith3d
{

class Camera;
class TimeClock;
class TerrainMesh;


class CameraListener : public grinliz::Listener< CameraListener >
{
  public:
        virtual void CameraEvent( Camera* ) = 0;
};

class Camera
{
  public:
        Camera();

        grinliz::Publisher< CameraListener > publish;

        void MoveCamera( float xVelocity, float yVelocity, float zVelocity );
        
        void MoveCameraAxial2D( float axialVelocity, float perpVelocity );

        void MoveCameraAxial3D( float axialVelocity );

        enum CameraAxis
        {
                PITCH,
                YAW             
        };

        void MoveCameraRotation( CameraAxis axis, float deltaRotation );

        void SetCameraRotation( float yaw, float pitch );

        void SetCamera( float x, float y, float z, float yaw, float pitch );

        void SetCameraPosition( float x, float y, float z ) {
                SetCamera( x, y, z, CalcYaw(), CalcPitch() );
        }

        void PanCamera( float x, float y, float z,  float yaw, float pitch );

        void PanCamera( U32 millisec, float x, float y, float z,  float yaw, float pitch );

        const grinliz::Vector3F&        Eye()           {       return pos.loc; } 

        float CalcPitch();
        float CalcYaw();

        const grinliz::Matrix4& RotationMatrix()        { return pos.rot; }

        grinliz::Vector3F Direction() { grinliz::Vector3F dir = { pos.rot.x[0], pos.rot.x[4], pos.rot.x[8] }; return dir; }

        // Update the camera. Called by the engine.
        void DoTick( TimeClock* tc, TerrainMesh* tmesh );
        // Issue camera commands to OpenGl
        void Operate( float farPlaneDistance = FAR_PLANE_DISTANCE );

        void RotationToMatrix( float _yaw, float _pitch, grinliz::Matrix4* matrix );

  private:

        struct Position
        {
                grinliz::Vector3F       loc;
                grinliz::Matrix4        rot;

                void Clamp();
        };

        struct Pan
        {
                grinliz::Quaternion startQuat;
                grinliz::Vector3F startLoc;
                grinliz::Quaternion endQuat;
                grinliz::Vector3F endLoc;
                U32 startTime;
                U32 endTime;
        };

        Position                pos;
        Pan                             pan;
        bool                    panning;
};
};      // namespace lilith3d

#endif

---