Force_Spring.h

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/*
===========================================================================

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company. 

This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).  

Doom 3 Source Code 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 3 of the License, or
(at your option) any later version.

Doom 3 Source Code 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 Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

#ifndef __FORCE_SPRING_H__
#define __FORCE_SPRING_H__

/*
===============================================================================

        Spring force

===============================================================================
*/

class idForce_Spring : public idForce {

public:
        CLASS_PROTOTYPE( idForce_Spring );

                                                idForce_Spring( void );
        virtual                         ~idForce_Spring( void );
                                                // initialize the spring
        void                            InitSpring( float Kstretch, float Kcompress, float damping, float restLength );
                                                // set the entities and positions on these entities the spring is attached to
        void                            SetPosition(    idPhysics *physics1, int id1, const idVec3 &p1,
                                                                                idPhysics *physics2, int id2, const idVec3 &p2 );

public: // common force interface
        virtual void            Evaluate( int time );
        virtual void            RemovePhysics( const idPhysics *phys );

private:

        // spring properties
        float                           Kstretch;
        float                           Kcompress;
        float                           damping;
        float                           restLength;

        // positioning
        idPhysics *                     physics1;       // first physics object
        int                                     id1;            // clip model id of first physics object
        idVec3                          p1;                     // position on clip model
        idPhysics *                     physics2;       // second physics object
        int                                     id2;            // clip model id of second physics object
        idVec3                          p2;                     // position on clip model

};

#endif /* !__FORCE_SPRING_H__ */