more work on dump grid/vtk

src/dump_grid_vtk.h

@@ -0,0 +1,49 @@
+/* -*- c++ -*- ----------------------------------------------------------
+   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
+   https://www.lammps.org/, Sandia National Laboratories
+   LAMMPS Development team: developers@lammps.org
+
+   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 DUMP_CLASS
+// clang-format off
+DumpStyle(grid/vtk,DumpGridVTK);
+// clang-format on
+#else
+
+#ifndef LMP_DUMP_GRID_VTK_H
+#define LMP_DUMP_GRID_VTK_H
+
+#include "dump_grid.h"
+
+namespace LAMMPS_NS {
+
+class DumpGridVTK : public DumpGrid {
+ public:
+  DumpGridVTK(class LAMMPS *, int, char **);
+  ~DumpGridVTK() override;
+
+ protected:
+  int mode;
+  double *xcoord,*ycoord,*zcoord;
+  
+  // methods
+
+  void init_style() override;
+  void write_header(bigint) override;
+  void write_data(int, double *) override;
+  void write_footer() override;
+
+  void xyz_grid();
+};
+
+}    // namespace LAMMPS_NS
+
+#endif
+#endif