fix_drag.h
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	/* ----------------------------------------------------------------------
	LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
	http://lammps.sandia.gov, Sandia National Laboratories
	Steve Plimpton, sjplimp@sandia.gov

	Copyright (2003) Sandia Corporation. Under the terms of Contract
	DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
	certain rights in this software. This software is distributed under
	the GNU General Public License.

	See the README file in the top-level LAMMPS directory.
	------------------------------------------------------------------------- */

	#ifdef FIX_CLASS

	FixStyle(drag,FixDrag)

	#else

	#ifndef LMP_FIX_DRAG_H
	#define LMP_FIX_DRAG_H

	#include "fix.h"

	namespace LAMMPS_NS {

	class FixDrag : public Fix {
	public:
	FixDrag(class LAMMPS , int, char *);
	int setmask();
	void init();
	void setup(int);
	void post_force(int);
	void post_force_respa(int, int, int);
	double compute_vector(int);

	private:
	double xc,yc,zc;
	double f_mag;
	int xflag,yflag,zflag;
	double delta;
	int nlevels_respa;
	double ftotal[3],ftotal_all[3];
	int force_flag;
	};

	}

	#endif
	#endif