CenterOfMass.cpp

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 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the following paper when you publish your work:
 *
 * [1] Drisko et al., J. Open Source Softw. 9, 7004 (2024).
 *
 * Good starting points for code and simulation methodology are:
 *
 * [2] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
 * [3] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
 * [4] Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).
 * [5] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 * [6] Kuang & Gezelter, Mol. Phys., 110, 691-701 (2012).
 * [7] Lamichhane, Gezelter & Newman, J. Chem. Phys. 141, 134109 (2014).
 * [8] Bhattarai, Newman & Gezelter, Phys. Rev. B 99, 094106 (2019).
 * [9] Drisko & Gezelter, J. Chem. Theory Comput. 20, 4986-4997 (2024).
 */
 
#include "applications/sequentialProps/CenterOfMass.hpp"
 
#include <algorithm>
#include <functional>
 
#include "io/DumpReader.hpp"
#include "primitives/Molecule.hpp"
#include "utils/Revision.hpp"
#include "utils/simError.h"
 
namespace OpenMD {
 
  CenterOfMass::CenterOfMass(SimInfo* info, const std::string& filename,
                             const std::string& sele1,
                             const std::string& sele2) :
      SequentialAnalyzer(info, filename, sele1, sele2) {
    setOutputName(getPrefix(filename) + ".com");
  }
 
  void CenterOfMass::doFrame(int) {
    StuntDouble* sd;
    int i;
 
    if (evaluator1_.isDynamic()) {
      seleMan1_.setSelectionSet(evaluator1_.evaluate());
    }
 
    // Prevents double counting atoms that are part of rigid bodies
    // and therefore miscalculating the total mass:
    
    auto reducedSeleMan = seleMan1_.removeAtomsInRigidBodies();
 
 
    RealType mtot = 0.0;
    Vector3d com(V3Zero);
    RealType mass;
 
    for (sd = reducedSeleMan.beginSelected(i); sd != NULL;
         sd = reducedSeleMan.nextSelected(i)) {
      mass = sd->getMass();
      mtot += mass;
      com += sd->getPos() * mass;
    }
 
    com /= mtot;
 
    values_.push_back(com);
  }
 
  void CenterOfMass::writeSequence() {
    std::ofstream ofs(outputFilename_.c_str(), std::ios::binary);
 
    if (ofs.is_open()) {
      Revision r;
 
      ofs << "# " << getSequenceType() << "\n";
      ofs << "# OpenMD " << r.getFullRevision() << "\n";
      ofs << "# " << r.getBuildDate() << "\n";
      ofs << "# selection script1: \"" << selectionScript1_;
      ofs << "\"\tselection script2: \"" << selectionScript2_ << "\"\n";
      if (!paramString_.empty())
        ofs << "# parameters: " << paramString_ << "\n";
 
      ofs << "#time\tvalue\n";
 
      for (unsigned int i = 0; i < times_.size(); ++i) {
        ofs << times_[i] << "\t" << values_[i].x() << "\t" << values_[i].y()
            << "\t" << values_[i].z() << "\n";
      }
 
    } else {
      snprintf(painCave.errMsg, MAX_SIM_ERROR_MSG_LENGTH,
               "CenterOfMass::writeSequence Error: failed to open %s\n",
               outputFilename_.c_str());
      painCave.isFatal = 1;
      simError();
    }
 
    ofs.close();
  }
}  // namespace OpenMD