HBondGeometric.cpp

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 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
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 * work.  Good starting points are:
 *
 * [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
 * [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
 * [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).
 * [4] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 * [5] Kuang & Gezelter, Mol. Phys., 110, 691-701 (2012).
 * [6] Lamichhane, Gezelter & Newman, J. Chem. Phys. 141, 134109 (2014).
 * [7] Lamichhane, Newman & Gezelter, J. Chem. Phys. 141, 134110 (2014).
 * [8] Bhattarai, Newman & Gezelter, Phys. Rev. B 99, 094106 (2019).
 */
 
#include "applications/staticProps/HBondGeometric.hpp"
 
#include <vector>
 
#include "io/DumpReader.hpp"
#include "primitives/Molecule.hpp"
#include "utils/Constants.hpp"
#include "utils/simError.h"
 
namespace OpenMD {
 
  HBondGeometric::HBondGeometric(SimInfo* info, const std::string& filename,
                                 const std::string& sele1,
                                 const std::string& sele2, double rCut,
                                 double thetaCut, int nbins) :
      StaticAnalyser(info, filename, nbins),
      selectionScript1_(sele1), seleMan1_(info), evaluator1_(info),
      selectionScript2_(sele2), seleMan2_(info), evaluator2_(info) {
    setOutputName(getPrefix(filename) + ".hbg");
 
    ff_ = info_->getForceField();
 
    evaluator1_.loadScriptString(sele1);
    if (!evaluator1_.isDynamic()) {
      seleMan1_.setSelectionSet(evaluator1_.evaluate());
    }
    evaluator2_.loadScriptString(sele2);
    if (!evaluator2_.isDynamic()) {
      seleMan2_.setSelectionSet(evaluator2_.evaluate());
    }
 
    // Set up cutoff values:
    nBins_    = nbins;
    rCut_     = rCut;
    thetaCut_ = thetaCut;
 
    nHBonds_.resize(nBins_);
    nDonor_.resize(nBins_);
    nAcceptor_.resize(nBins_);
 
    initializeHistogram();
  }
 
  void HBondGeometric::initializeHistogram() {
    std::fill(nHBonds_.begin(), nHBonds_.end(), 0);
    std::fill(nDonor_.begin(), nDonor_.end(), 0);
    std::fill(nAcceptor_.begin(), nAcceptor_.end(), 0);
    nSelected_ = 0;
  }
 
  void HBondGeometric::process() {
    Molecule* mol1;
    Molecule* mol2;
    Molecule::HBondDonor* hbd1;
    Molecule::HBondDonor* hbd2;
    std::vector<Molecule::HBondDonor*>::iterator hbdi;
    std::vector<Molecule::HBondDonor*>::iterator hbdj;
    std::vector<Atom*>::iterator hbai;
    std::vector<Atom*>::iterator hbaj;
    Atom* hba1;
    Atom* hba2;
    Vector3d dPos;
    Vector3d aPos;
    Vector3d hPos;
    Vector3d DH;
    Vector3d DA;
    RealType DAdist, DHdist, theta, ctheta;
    int ii, jj;
    int nHB, nA, nD;
 
    DumpReader reader(info_, dumpFilename_);
    int nFrames   = reader.getNFrames();
    frameCounter_ = 0;
 
    for (int istep = 0; istep < nFrames; istep += step_) {
      reader.readFrame(istep);
      frameCounter_++;
      currentSnapshot_ = info_->getSnapshotManager()->getCurrentSnapshot();
 
      if (evaluator1_.isDynamic()) {
        seleMan1_.setSelectionSet(evaluator1_.evaluate());
      }
      if (evaluator2_.isDynamic()) {
        seleMan2_.setSelectionSet(evaluator2_.evaluate());
      }
 
      for (mol1 = seleMan1_.beginSelectedMolecule(ii); mol1 != NULL;
           mol1 = seleMan1_.nextSelectedMolecule(ii)) {
        // We're collecting statistics on the molecules in selection 1:
        nHB = 0;
        nA  = 0;
        nD  = 0;
 
        for (mol2 = seleMan2_.beginSelectedMolecule(jj); mol2 != NULL;
             mol2 = seleMan2_.nextSelectedMolecule(jj)) {
          // loop over the possible donors in molecule 1:
          for (hbd1 = mol1->beginHBondDonor(hbdi); hbd1 != NULL;
               hbd1 = mol1->nextHBondDonor(hbdi)) {
            dPos = hbd1->donorAtom->getPos();
            hPos = hbd1->donatedHydrogen->getPos();
            DH   = hPos - dPos;
            currentSnapshot_->wrapVector(DH);
            DHdist = DH.length();
 
            // loop over the possible acceptors in molecule 2:
            for (hba2 = mol2->beginHBondAcceptor(hbaj); hba2 != NULL;
                 hba2 = mol2->nextHBondAcceptor(hbaj)) {
              aPos = hba2->getPos();
              DA   = aPos - dPos;
              currentSnapshot_->wrapVector(DA);
              DAdist = DA.length();
 
              // Distance criteria: are the donor and acceptor atoms
              // close enough?
              if (DAdist < rCut_) {
                ctheta = dot(DH, DA) / (DHdist * DAdist);
                theta  = acos(ctheta) * 180.0 / Constants::PI;
 
                // Angle criteria: are the D-H and D-A and vectors close?
                if (theta < thetaCut_) {
                  // molecule 1 is a Hbond donor:
                  nHB++;
                  nD++;
                }
              }
            }
          }
 
          // now loop over the possible acceptors in molecule 1:
          for (hba1 = mol1->beginHBondAcceptor(hbai); hba1 != NULL;
               hba1 = mol1->nextHBondAcceptor(hbai)) {
            aPos = hba1->getPos();
 
            // loop over the possible donors in molecule 2:
            for (hbd2 = mol2->beginHBondDonor(hbdj); hbd2 != NULL;
                 hbd2 = mol2->nextHBondDonor(hbdj)) {
              dPos = hbd2->donorAtom->getPos();
 
              DA = aPos - dPos;
              currentSnapshot_->wrapVector(DA);
              DAdist = DA.length();
 
              // Distance criteria: are the donor and acceptor atoms
              // close enough?
              if (DAdist < rCut_) {
                hPos = hbd2->donatedHydrogen->getPos();
                DH   = hPos - dPos;
                currentSnapshot_->wrapVector(DH);
                DHdist = DH.length();
                ctheta = dot(DH, DA) / (DHdist * DAdist);
                theta  = acos(ctheta) * 180.0 / Constants::PI;
                // Angle criteria: are the D-H and D-A and vectors close?
                if (theta < thetaCut_) {
                  // molecule 1 is a Hbond acceptor:
                  nHB++;
                  nA++;
                }
              }
            }
          }
        }
        collectHistogram(nHB, nA, nD);
      }
    }
    writeHistogram();
  }
 
  void HBondGeometric::collectHistogram(int nHB, int nA, int nD) {
    nHBonds_[nHB] += 1;
    nAcceptor_[nA] += 1;
    nDonor_[nD] += 1;
    nSelected_++;
  }
 
  void HBondGeometric::writeHistogram() {
    std::ofstream osq(getOutputFileName().c_str());
 
    if (osq.is_open()) {
      osq << "# HydrogenBonding Statistics\n";
      osq << "# selection1: (" << selectionScript1_ << ")"
          << "\tselection2: (" << selectionScript2_ << ")\n";
      osq << "# molecules in selection1: " << nSelected_ << "\n";
      osq << "# "
             "nHBonds\tnAcceptor\tnDonor\tp(nHBonds)\tp(nAcceptor)\tp(nDonor)"
             "\n";
      // Normalize by number of frames and write it out:
      for (int i = 0; i < nBins_; ++i) {
        osq << i;
        osq << "\t" << nHBonds_[i];
        osq << "\t" << nAcceptor_[i];
        osq << "\t" << nDonor_[i];
        osq << "\t" << (RealType)(nHBonds_[i]) / nSelected_;
        osq << "\t" << (RealType)(nAcceptor_[i]) / nSelected_;
        osq << "\t" << (RealType)(nDonor_[i]) / nSelected_;
        osq << "\n";
      }
      osq.close();
 
    } else {
      snprintf(painCave.errMsg, MAX_SIM_ERROR_MSG_LENGTH,
               "HBondGeometric: unable to open %s\n",
               (getOutputFileName() + "q").c_str());
      painCave.isFatal = 1;
      simError();
    }
  }
}  // namespace OpenMD