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region_intersect.cpp
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Sat, Sep 14, 18:20

region_intersect.cpp
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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.
------------------------------------------------------------------------- */
#include "stdlib.h"
#include "string.h"
#include "region_intersect.h"
#include "domain.h"
#include "error.h"
using namespace LAMMPS_NS;
#define MIN(A,B) ((A) < (B)) ? (A) : (B)
#define MAX(A,B) ((A) > (B)) ? (A) : (B)
/* ---------------------------------------------------------------------- */
RegIntersect::RegIntersect(LAMMPS *lmp, int narg, char **arg) :
Region(lmp, narg, arg)
{
if (narg < 5) error->all("Illegal region command");
int n = atoi(arg[2]);
if (n < 2) error->all("Illegal region command");
options(narg-(n+3),&arg[n+3]);
// build list of regions to intersect
list = new int[n];
nregion = 0;
int iregion;
for (int iarg = 0; iarg < n; iarg++) {
for (iregion = 0; iregion < domain->nregion; iregion++)
if (strcmp(arg[iarg+3],domain->regions[iregion]->id) == 0) break;
if (iregion == domain->nregion)
error->all("Region union region ID does not exist");
list[nregion++] = iregion;
}
// extent of intersection of regions
Region **regions = domain->regions;
extent_xlo = regions[list[0]]->extent_xlo;
extent_ylo = regions[list[0]]->extent_ylo;
extent_zlo = regions[list[0]]->extent_zlo;
extent_xhi = regions[list[0]]->extent_xhi;
extent_yhi = regions[list[0]]->extent_yhi;
extent_zhi = regions[list[0]]->extent_zhi;
for (int ilist = 1; ilist < nregion; ilist++) {
extent_xlo = MAX(extent_xlo,regions[list[ilist]]->extent_xlo);
extent_ylo = MAX(extent_ylo,regions[list[ilist]]->extent_ylo);
extent_zlo = MAX(extent_zlo,regions[list[ilist]]->extent_zlo);
extent_xhi = MIN(extent_xhi,regions[list[ilist]]->extent_xhi);
extent_yhi = MIN(extent_yhi,regions[list[ilist]]->extent_yhi);
extent_zhi = MIN(extent_zhi,regions[list[ilist]]->extent_zhi);
}
}
/* ---------------------------------------------------------------------- */
RegIntersect::~RegIntersect()
{
delete [] list;
}
/* ---------------------------------------------------------------------- */
int RegIntersect::match(double x, double y, double z)
{
int ilist;
Region **regions = domain->regions;
for (ilist = 0; ilist < nregion; ilist++)
if (!regions[list[ilist]]->match(x,y,z)) break;
int inside; // inside if matched all regions
if (ilist == nregion) inside = 1;
else inside = 0;
return !(inside ^ interior); // 1 if same, 0 if different
}

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