Force_Grab.cpp

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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.

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

#include "../../idlib/precompiled.h"
#pragma hdrstop

#ifdef _D3XP

#include "../Game_local.h"

CLASS_DECLARATION( idForce, idForce_Grab )
END_CLASS


/*
================
idForce_Grab::Save
================
*/
void idForce_Grab::Save( idSaveGame *savefile ) const {
        
        savefile->WriteFloat( damping );
        savefile->WriteVec3( goalPosition );
        savefile->WriteFloat( distanceToGoal );
        savefile->WriteInt( id );
}

/*
================
idForce_Grab::Restore
================
*/
void idForce_Grab::Restore( idRestoreGame *savefile ) {

        //Note: Owner needs to call set physics
        savefile->ReadFloat( damping );
        savefile->ReadVec3( goalPosition );
        savefile->ReadFloat( distanceToGoal );
        savefile->ReadInt( id );
}

/*
================
idForce_Grab::idForce_Grab
================
*/
idForce_Grab::idForce_Grab( void ) {
        damping                 = 0.5f;
        physics                 = NULL;
        id                              = 0;
}

/*
================
idForce_Grab::~idForce_Grab
================
*/
idForce_Grab::~idForce_Grab( void ) {
}

/*
================
idForce_Grab::Init
================
*/
void idForce_Grab::Init( float damping ) {
        if ( damping >= 0.0f && damping < 1.0f ) {
                this->damping = damping;
        }
}

/*
================
idForce_Grab::SetPhysics
================
*/
void idForce_Grab::SetPhysics( idPhysics *phys, int id, const idVec3 &goal ) {
        this->physics = phys;
        this->id = id;
        this->goalPosition = goal;
}

/*
================
idForce_Grab::SetGoalPosition
================
*/
void idForce_Grab::SetGoalPosition( const idVec3 &goal ) {
        this->goalPosition = goal;
}

/*
=================
idForce_Grab::GetDistanceToGoal
=================
*/
float idForce_Grab::GetDistanceToGoal( void ) {
        return distanceToGoal;
}

/*
================
idForce_Grab::Evaluate
================
*/
void idForce_Grab::Evaluate( int time ) {
        if ( !physics ) {
                return;
        }
        idVec3                  forceDir, v, objectCenter;
        float                   forceAmt;
        float                   mass = physics->GetMass(id);

        objectCenter = physics->GetAbsBounds(id).GetCenter();

        if ( g_grabberRandomMotion.GetBool() && !gameLocal.isMultiplayer ) {
                // Jitter the objectCenter around so it doesn't remain stationary
                float SinOffset = idMath::Sin( (float)(gameLocal.time)/66.f );
                float randScale1 = gameLocal.random.RandomFloat();
                float randScale2 = gameLocal.random.CRandomFloat();
                objectCenter.x += ( SinOffset * 3.5f * randScale1 ) + ( randScale2 * 1.2f );
                objectCenter.y += ( SinOffset * -3.5f * randScale1 ) + ( randScale2 * 1.4f );
                objectCenter.z += ( SinOffset * 2.4f * randScale1 ) + ( randScale2 * 1.6f );
        }

        forceDir = goalPosition - objectCenter;
        distanceToGoal = forceDir.Normalize();

        float temp = distanceToGoal;
        if ( temp > 12.f && temp < 32.f ) {
                temp = 32.f;
        }
        forceAmt = (1000.f * mass) + (500.f * temp * mass);

        if ( forceAmt/mass > 120000.f ) {
                forceAmt = 120000.f * mass;
        }
        physics->AddForce( id, objectCenter, forceDir * forceAmt );

        if ( distanceToGoal < 196.f ) {
                v = physics->GetLinearVelocity( id );
                physics->SetLinearVelocity( v * damping, id );
        }
        if ( distanceToGoal < 16.f ) {
                v = physics->GetAngularVelocity(id);
                if ( v.LengthSqr() > Square(8) ) {
                        physics->SetAngularVelocity( v * 0.99999f, id );
                }
        }
}

/*
================
idForce_Grab::RemovePhysics
================
*/
void idForce_Grab::RemovePhysics( const idPhysics *phys ) {
        if ( physics == phys ) {
                physics = NULL;
        }
}

#endif  // _D3XP