coulombforce.h

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/* This file is part of StepCore library.
   Copyright (C) 2007 Vladimir Kuznetsov <ks.vladimir@gmail.com>

   StepCore library 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.

   StepCore library 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 StepCore; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef STEPCORE_COULOMBFORCE_H
#define STEPCORE_COULOMBFORCE_H

#include "world.h"
#include "object.h"
#include "constants.h"

namespace StepCore
{

class CoulombForce;

class CoulombForceErrors: public ObjectErrors
{
    STEPCORE_OBJECT(CoulombForceErrors)

public:
    CoulombForceErrors(Item* owner = NULL)
        : ObjectErrors(owner), _coulombConstVariance(0) {}

    CoulombForce* coulombForce() const;

    double coulombConstVariance() const { return _coulombConstVariance; }
    void   setCoulombConstVariance(double coulombConstVariance) {
        _coulombConstVariance = coulombConstVariance; }

protected:
    double _coulombConstVariance;
    friend class CoulombForce;
};


class CoulombForce: public Item, public Force
{
    STEPCORE_OBJECT(CoulombForce)

public:
    CoulombForce(double coulombConst = Constants::Coulomb);

    void calcForce(bool calcVariances);

    double coulombConst() const { return _coulombConst; }
    void   setCoulombConst(double coulombConst) { _coulombConst = coulombConst; }

    CoulombForceErrors* coulombForceErrors() {
        return static_cast<CoulombForceErrors*>(objectErrors()); }

protected:
    ObjectErrors* createObjectErrors() { return new CoulombForceErrors(this); }

    double _coulombConst;
};

} // namespace StepCore

#endif