/** Based on the given atom mask expression determine what molecules are
* selected by the mask.
* \return A list of atom pairs that mark the beginning and end of each
* selected molecule.
*/
Action_AutoImage::pairList
Action_AutoImage::SetupAtomRanges( Topology const& currentParm, std::string const& maskexpr )
{
pairList imageList;
CharMask Mask1( maskexpr.c_str() );
if (currentParm.SetupCharMask( Mask1 )) return imageList;
if (Mask1.None()) return imageList;
for (Topology::mol_iterator mol = currentParm.MolStart(); mol != currentParm.MolEnd(); mol++)
{
int firstAtom = mol->BeginAtom();
int lastAtom = mol->EndAtom();
// Check that each atom in the range is in Mask1
bool rangeIsValid = true;
for (int atom = firstAtom; atom < lastAtom; ++atom) {
if (!Mask1.AtomInCharMask(atom)) {
rangeIsValid = false;
break;
}
}
if (rangeIsValid) {
imageList.push_back( firstAtom );
imageList.push_back( lastAtom );
}
}
mprintf("\tMask [%s] corresponds to %zu molecules\n", Mask1.MaskString(), imageList.size()/2);
return imageList;
}
/** An atom pair list consists of 2 values for each entry, a beginning
* index and ending index. For molecules and residues this is the first
* and just beyond the last atom; for atoms it is just the atom itself
* twice.
*/
Image::PairType Image::CreatePairList(Topology const& Parm, Mode modeIn,
std::string const& maskExpression)
{
PairType atomPairs;
// Set up mask based on desired imaging mode.
if ( modeIn == BYMOL || modeIn == BYRES ) {
CharMask cmask( maskExpression );
if ( Parm.SetupCharMask( cmask ) ) return atomPairs;
cmask.MaskInfo();
if (cmask.None()) return atomPairs;
// Set up atom range for each entity to be imaged.
if (modeIn == BYMOL) {
atomPairs.reserve( Parm.Nmol()*2 );
for (Topology::mol_iterator mol = Parm.MolStart();
mol != Parm.MolEnd(); ++mol)
CheckRange( atomPairs, cmask, mol->BeginAtom(), mol->EndAtom());
} else { // BYRES
atomPairs.reserve( Parm.Nres()*2 );
for (Topology::res_iterator residue = Parm.ResStart();
residue != Parm.ResEnd(); ++residue)
CheckRange( atomPairs, cmask, residue->FirstAtom(), residue->LastAtom() );
}
} else { // BYATOM
AtomMask imask( maskExpression );
if ( Parm.SetupIntegerMask( imask ) ) return atomPairs;
imask.MaskInfo();
if (imask.None()) return atomPairs;
atomPairs.reserve( Parm.Natom()*2 );
for (AtomMask::const_iterator atom = imask.begin(); atom != imask.end(); ++atom) {
atomPairs.push_back( *atom );
atomPairs.push_back( (*atom)+1 );
}
}
// mprintf("\tNumber of %ss to be imaged is %zu based on mask '%s'\n",
// ModeString[modeIn], atomPairs.size()/2, maskIn.MaskString());
return atomPairs;
}
/** Like the strip action, closest will modify the current parm keeping info
* for atoms in mask plus the closestWaters solvent molecules. Set up the
* vector of MolDist objects, one for every solvent molecule in the original
* parm file. Atom masks for each solvent molecule will be set up.
*/
Action_Closest::RetType Action_Closest::Setup(Topology const& topIn, CoordinateInfo const& cInfoIn)
{
// If there are no solvent molecules this action is not valid.
if (topIn.Nsolvent()==0) {
mprintf("Warning: Parm %s does not contain solvent.\n",topIn.c_str());
return Action_Closest::SKIP;
}
// If # solvent to keep >= solvent in this parm the action is not valid.
if (closestWaters_ >= topIn.Nsolvent()) {
mprintf("Warning: # solvent to keep (%i) >= # solvent molecules in '%s' (%i)\n",
closestWaters_, topIn.c_str(), topIn.Nsolvent());
return Action_Closest::SKIP;
}
image_.SetupImaging( cInfoIn.TrajBox().Type() );
if (image_.ImagingEnabled())
mprintf("\tDistances will be imaged.\n");
else
mprintf("\tImaging off.\n");
// LOOP OVER MOLECULES
// 1: Check that all solvent molecules contain same # atoms. Solvent
// molecules must be identical for the command to work properly;
// the prmtop strip occurs only once so the solvent params become fixed.
// 2: Set up a mask for all solvent molecules.
SolventMols_.clear();
// NOTE: May not be necessary to init 'solvent'
MolDist solvent;
solvent.D = 0.0;
solvent.mol = 0;
SolventMols_.resize(topIn.Nsolvent(), solvent);
std::vector<MolDist>::iterator mdist = SolventMols_.begin();
// 3: Set up the soluteMask for all non-solvent molecules.
int molnum = 1;
int nclosest = 0;
int NsolventAtoms = -1;
for (Topology::mol_iterator Mol = topIn.MolStart();
Mol != topIn.MolEnd(); ++Mol)
{
if ( Mol->IsSolvent() ) {
// Solvent, check for same # of atoms.
if (NsolventAtoms == -1)
NsolventAtoms = Mol->NumAtoms();
else if ( NsolventAtoms != Mol->NumAtoms() ) {
mprinterr("Error: Solvent molecules in '%s' are not of uniform size.\n"
"Error: First solvent mol = %i atoms, solvent mol %i = %i atoms.\n",
topIn.c_str(), NsolventAtoms, molnum, (*Mol).NumAtoms());
return Action_Closest::ERR;
}
// mol here is the output molecule number which is why it starts from 1.
mdist->mol = molnum;
// Solvent molecule mask
mdist->mask.AddAtomRange( Mol->BeginAtom(), Mol->EndAtom() );
// Atoms in the solvent molecule to actually calculate distances to.
if (firstAtom_) {
mdist->solventAtoms.assign(1, Mol->BeginAtom() );
} else {
mdist->solventAtoms.clear();
mdist->solventAtoms.reserve( Mol->NumAtoms() );
for (int svatom = Mol->BeginAtom(); svatom < Mol->EndAtom(); svatom++)
mdist->solventAtoms.push_back( svatom );
}
if (debug_ > 0) {
mprintf("DEBUG:\tSet up mol %i:", mdist->mol); // DEBUG
mdist->mask.PrintMaskAtoms("solvent"); // DEBUG
mprintf("\n"); // DEBUG
}
++mdist;
}
++molnum;
}
// Setup distance atom mask
// NOTE: Should ensure that no solvent atoms are selected!
if ( topIn.SetupIntegerMask(distanceMask_) ) return Action_Closest::ERR;
if (distanceMask_.None()) {
mprintf("Warning: Distance mask '%s' contains no atoms.\n",
distanceMask_.MaskString());
return Action_Closest::SKIP;
}
distanceMask_.MaskInfo();
// Check the total number of solvent atoms to be kept.
NsolventAtoms *= closestWaters_;
mprintf("\tKeeping %i solvent atoms.\n",NsolventAtoms);
if (NsolventAtoms < 1) {
mprintf("Warning: # of solvent atoms to be kept is < 1.\n");
return Action_Closest::SKIP;
}
NsolventMolecules_ = (int)SolventMols_.size();
return Action_Closest::OK;
}
/** Search for bonds between atoms in residues and atoms in adjacent residues
* using distance-based criterion that depends on atomic elements.
* \param top Topology to add bonds to.
* \param frameIn Frame containing atomic coordinates.
* \param offset Offset to add when determining if a bond is present.
* \param debug If > 0 print extra info.
*/
int BondSearch( Topology& top, Frame const& frameIn, double offset, int debug) {
mprintf("\tDetermining bond info from distances.\n");
if (frameIn.empty()) {
mprinterr("Internal Error: No coordinates set; cannot search for bonds.\n");
return 1;
}
# ifdef TIMER
Timer time_total, time_within, time_between;
time_total.Start();
time_within.Start();
# endif
// ----- STEP 1: Determine bonds within residues
for (Topology::res_iterator res = top.ResStart(); res != top.ResEnd(); ++res)
{
int stopatom = res->LastAtom();
// Check for bonds between each atom in the residue.
for (int atom1 = res->FirstAtom(); atom1 != stopatom; ++atom1) {
Atom::AtomicElementType a1Elt = top[atom1].Element();
// If this is a hydrogen and it already has a bond, move on.
if (a1Elt==Atom::HYDROGEN && top[atom1].Nbonds() > 0 )
continue;
for (int atom2 = atom1 + 1; atom2 != stopatom; ++atom2) {
Atom::AtomicElementType a2Elt = top[atom2].Element();
double D2 = DIST2_NoImage(frameIn.XYZ(atom1), frameIn.XYZ(atom2) );
double cutoff2 = Atom::GetBondLength(a1Elt, a2Elt) + offset;
cutoff2 *= cutoff2;
if (D2 < cutoff2) {
top.AddBond(atom1, atom2);
// Once a bond has been made to hydrogen move on.
if (a1Elt==Atom::HYDROGEN) break;
}
}
}
}
# ifdef TIMER
time_within.Stop();
time_between.Start();
# endif
// ----- STEP 2: Determine bonds between adjacent residues
Topology::mol_iterator nextmol = top.MolStart();
if (top.Nmol() > 0)
++nextmol;
for (Topology::res_iterator res = top.ResStart() + 1; res != top.ResEnd(); ++res)
{
// If molecule information is already present, check if first atom of
// this residue >= first atom of next molecule, which indicates this
// residue and the previous residue are in different molecules.
if ( (nextmol != top.MolEnd()) &&
(res->FirstAtom() >= nextmol->BeginAtom()) )
{
++nextmol;
continue;
}
// If this residue is recognized as solvent, no need to check previous or
// next residue
if ( res->NameIsSolvent() ) {
++res;
if (res == top.ResEnd()) break;
continue;
}
// Get previous residue
Topology::res_iterator previous_res = res - 1;
// If previous residue is recognized as solvent, no need to check previous.
if ( previous_res->NameIsSolvent() ) continue;
// Get previous residue start atom
int startatom = previous_res->FirstAtom();
// Previous residue stop atom, this residue start atom
int midatom = res->FirstAtom();
// This residue stop atom
int stopatom = res->LastAtom();
// Check for bonds between adjacent residues
for (int atom1 = startatom; atom1 != midatom; atom1++) {
Atom::AtomicElementType a1Elt = top[atom1].Element();
if (a1Elt==Atom::HYDROGEN) continue;
for (int atom2 = midatom; atom2 != stopatom; atom2++) {
Atom::AtomicElementType a2Elt = top[atom2].Element();
if (a2Elt==Atom::HYDROGEN) continue;
double D2 = DIST2_NoImage(frameIn.XYZ(atom1), frameIn.XYZ(atom2) );
double cutoff2 = Atom::GetBondLength(a1Elt, a2Elt) + offset;
cutoff2 *= cutoff2;
if (D2 < cutoff2)
top.AddBond(atom1, atom2);
}
}
}
# ifdef TIMER
time_between.Stop();
time_total.Stop();
time_within.WriteTiming(2, "Distances within residues", time_total.Total());
time_between.WriteTiming(2, "Distances between residues", time_total.Total());
time_total.WriteTiming(1, "Total for determining bonds via distances");
# endif
if (debug > 0)
mprintf("\t%s: %zu bonds to hydrogen, %zu other bonds.\n", top.c_str(),
top.BondsH().size(), top.Bonds().size());
return 0;
}
