unsigned int
Schuffenhauer::CalculateAcyclicBonds(OpenBabel::OBMol& mol)
{
unsigned int nbonds(0);
OpenBabel::OBAtom* nbratom[2];
OpenBabel::OBBond* bond;
std::vector<OpenBabel::OBBond*>::iterator bvi;
for (bond = mol.BeginBond(bvi); bond; bond = mol.NextBond(bvi))
{
nbratom[0] = bond->GetBeginAtom();
nbratom[1] = bond->GetEndAtom();
if (nbratom[0] && nbratom[1])
{
if (!bond->IsInRing() &&
(nbratom[0]->GetValence() > 1) &&
(nbratom[1]->GetValence() > 1))
{
++nbonds;
}
}
}
return nbonds;
}
bool
Schuffenhauer::HasLinkerToHeteroAtom(OpenBabel::OBMol& mol, OpenBabel::OBRing* ring)
{
std::vector<OpenBabel::OBBond*>::iterator bvi;
OpenBabel::OBBond* bond;
OpenBabel::OBAtom* nbrAtom[2];
for (bond = mol.BeginBond(bvi); bond; bond = mol.NextBond(bvi))
{
nbrAtom[0] = bond->GetBeginAtom();
nbrAtom[1] = bond->GetEndAtom();
if
(
// Neighbours are real
nbrAtom[0] &&
nbrAtom[1] &&
// Bond should be acyclic
!bond->IsInRing() &&
// Both atoms have to be ring atoms
nbrAtom[0]->IsInRing() &&
nbrAtom[1]->IsInRing() &&
// At least one of the atoms should be hetero
(nbrAtom[0]->IsHeteroatom() || nbrAtom[1]->IsHeteroatom()) &&
// One of the atoms, but not both, should be part of this ring
((ring->IsMember(nbrAtom[0]) && !ring->IsMember(nbrAtom[1])) ||
(ring->IsMember(nbrAtom[1]) && !ring->IsMember(nbrAtom[0])))
)
{
return true;
}
}
return false;
}
void
FilterRingsystems::Calculate(OpenBabel::OBMol* mol)
{
// Are there rings?
bool rings(false);
OpenBabel::OBAtom* atom;
std::vector<OpenBabel::OBAtom*>::iterator i;
for (atom = mol->BeginAtom(i); atom; atom = mol->NextAtom(i))
{
if (atom->IsInRing())
{
rings = true;
break;
}
}
if (rings)
{
// Make workcopy of original mol
OpenBabel::OBMol m = *mol; m.DeleteHydrogens();
// Remove all atoms that are not part of ring
std::vector<OpenBabel::OBAtom*> nonRingAtoms;
nonRingAtoms.clear();
for (atom = m.BeginAtom(i); atom; atom = m.NextAtom(i))
{
if (!atom->IsInRing()) nonRingAtoms.push_back(atom);
}
for (unsigned int i(0); i < nonRingAtoms.size(); ++i)
{
m.DeleteAtom(nonRingAtoms[i]);
}
// Remove all bonds that are not part of a ring
std::vector<OpenBabel::OBBond*> nonRingBonds;
nonRingBonds.clear();
OpenBabel::OBBond* bond;
std::vector<OpenBabel::OBBond*>::iterator j;
for (bond = m.BeginBond(j); bond; bond = m.NextBond(j))
{
if (!bond->IsInRing()) nonRingBonds.push_back(bond);
}
for (unsigned int i(0); i < nonRingBonds.size(); ++i)
{
m.DeleteBond(nonRingBonds[i]);
}
// Count ringsystems
std::vector<std::vector< int > > ringsystems;
m.ContigFragList(ringsystems);
_result = ringsystems.size();
}
else
{
_result = 0;
}
if ((_minLimit && (_result < _min)) || (_maxLimit && (_result > _max)))
{
_passed = false;
}
else
{
_passed = true;
}
}