Restraint.hpp

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 * [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).
 */
 
/**
 * @file Restraint.hpp
 * @author   cli2
 * @date  06/17/2009
 * @version 1.0
 */
 
#ifndef RESTRAINTS_RESTRAINT_HPP
#define RESTRAINTS_RESTRAINT_HPP
 
#include <config.h>
 
#include <map>
 
#include "math/Vector3.hpp"
#include "utils/GenericData.hpp"
 
namespace OpenMD {
 
  class Restraint {
  public:
    enum {
      rtDisplacement = 1,
      rtAbsoluteZ    = 2,
      rtTwist        = 4,
      rtSwingX       = 8,
      rtSwingY       = 16
    };
 
    using RealPair = std::pair<RealType, RealType>;
 
    Restraint() :
        twist0_(0.0), swingX0_(0.0), swingY0_(0.0), posZ0_(0.0),
        printRest_(false), restType_(0) {}
 
    virtual ~Restraint() {}
 
    // these are place-holders.  The subclasses will have different arguments
    // to the two functions.
    void calcForce() {}
    void setReferenceStructure() {}
 
    RealType getUnscaledPotential() { return pot_; }
    RealType getPotential() { return scaleFactor_ * pot_; }
 
    void setRestraintName(std::string name) { restName_ = name; }
    std::string getRestraintName() { return restName_; }
 
    /** Returns the restraint type  */
    int getRestraintType() { return restType_; }
    /** Sets the restraint type  */
    void setRestraintType(int restType) { restType_ = restType; }
 
    void setScaleFactor(RealType sf) { scaleFactor_ = sf; }
 
    void setDisplacementForceConstant(RealType kDisp) {
      kDisp_ = kDisp;
      restType_ |= rtDisplacement;
      if (printRest_) restInfo_[rtDisplacement] = std::make_pair(0.0, 0.0);
    }
 
    void setAbsoluteForceConstant(RealType kAbs) {
      kAbs_ = kAbs;
      restType_ |= rtAbsoluteZ;
      if (printRest_) restInfo_[rtAbsoluteZ] = std::make_pair(0.0, 0.0);
    }
 
    void setTwistForceConstant(RealType kTwist) {
      kTwist_ = kTwist / 4;
      restType_ |= rtTwist;
      if (printRest_) restInfo_[rtTwist] = std::make_pair(0.0, 0.0);
    }
 
    void setSwingXForceConstant(RealType kSwingX) {
      kSwingX_ = kSwingX;
      restType_ |= rtSwingX;
      if (printRest_) restInfo_[rtSwingX] = std::make_pair(0.0, 0.0);
    }
 
    void setSwingYForceConstant(RealType kSwingY) {
      kSwingY_ = kSwingY;
      restType_ |= rtSwingY;
      if (printRest_) restInfo_[rtSwingY] = std::make_pair(0.0, 0.0);
    }
 
    void setAbsolutePositionZ(RealType z0) {
      posZ0_ = z0;
      restType_ |= rtAbsoluteZ;
      if (printRest_) restInfo_[rtAbsoluteZ] = std::make_pair(0.0, 0.0);
    }
 
    /* restraint angles are measured relative to the ideal structure,
       and are measured in radians.  If you want to restrain to the
       same structure as the ideal structure, these do not need to be set.
    */
    void setRestrainedTwistAngle(RealType twist0) {
      twist0_ = twist0;
      restType_ |= rtTwist;
      if (printRest_) restInfo_[rtTwist] = std::make_pair(0.0, 0.0);
    }
 
    void setRestrainedSwingXAngle(RealType swingX0) {
      swingX0_ = swingX0;
      restType_ |= rtSwingX;
      if (printRest_) restInfo_[rtSwingX] = std::make_pair(0.0, 0.0);
    }
 
    void setRestrainedSwingYAngle(RealType swingY0) {
      swingY0_ = swingY0;
      restType_ |= rtSwingY;
      if (printRest_) restInfo_[rtSwingY] = std::make_pair(0.0, 0.0);
    }
 
    void setPrintRestraint(bool printRest) { printRest_ = printRest; }
 
    RealType getDisplacementForceConstant() { return kDisp_; }
    RealType getAbsoluteForceConstant() { return kAbs_; }
    RealType getAbsolutePositionZ() { return posZ0_; }
    RealType getTwistForceConstant() { return kTwist_; }
    RealType getSwingXForceConstant() { return kSwingX_; }
    RealType getSwingYForceConstant() { return kSwingY_; }
    RealType getRestrainedTwistAngle() { return twist0_; }
    RealType getRestrainedSwingXAngle() { return swingX0_; }
    RealType getRestrainedSwingYAngle() { return swingY0_; }
    std::map<int, RealPair> getRestraintInfo() { return restInfo_; }
    bool getPrintRestraint() { return printRest_; }
 
  protected:
    RealType scaleFactor_;
    RealType kDisp_;
    RealType kAbs_;
    RealType kTwist_;
    RealType kSwingX_;
    RealType kSwingY_;
    RealType pot_;
    RealType twist0_;
    RealType swingX0_;
    RealType swingY0_;
    RealType posZ0_;
    bool printRest_;
 
    int restType_;
    std::string restName_;
    std::map<int, RealPair> restInfo_;
  };
 
  using RestraintData = SimpleTypeData<Restraint*>;
}  // namespace OpenMD
 
#endif