add support for bond/angle/dihedral/improper plugins

examples/plugins/angle_zero2.h

@@ -0,0 +1,57 @@
+/* -*- c++ -*- ----------------------------------------------------------
+   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.
+------------------------------------------------------------------------- */
+
+#ifndef LMP_ANGLE_ZERO2_H
+#define LMP_ANGLE_ZERO2_H
+
+#include "angle.h"
+
+namespace LAMMPS_NS {
+
+class AngleZero2 : public Angle {
+ public:
+  AngleZero2(class LAMMPS *);
+  virtual ~AngleZero2();
+  virtual void compute(int, int);
+  virtual void coeff(int, char **);
+  virtual void settings(int, char **);
+
+  double equilibrium_angle(int);
+  void write_restart(FILE *);
+  void read_restart(FILE *);
+  void write_data(FILE *);
+
+  double single(int, int, int, int);
+
+ protected:
+  double *theta0;
+  int coeffflag;
+
+  void allocate();
+};
+
+}
+
+#endif
+
+/* ERROR/WARNING messages:
+
+E: Illegal ... command
+
+UNDOCUMENTED
+
+E: Incorrect args for angle coefficients
+
+Self-explanatory.  Check the input script or data file.
+
+*/