public IEnumerable <IAtomType> FindMatchingAtomTypes(IAtomContainer atomContainer)
{
foreach (var atom in atomContainer.Atoms)
{
var type = cdkMatcher.FindMatchingAtomType(atomContainer, atom);
atom.AtomTypeName = type?.AtomTypeName;
atom.Hybridization = type == null ? Hybridization.Unset : type.Hybridization;
}
Aromaticity.CDKLegacy.Apply(atomContainer);
int typeCounter = 0;
foreach (var atom in atomContainer.Atoms)
{
string mappedType = MapCDKToSybylType(atom);
if (mappedType == null)
{
yield return(null);
}
else
{
yield return(factory.GetAtomType(mappedType));
}
typeCounter++;
}
yield break;
}
/// <inheritdoc/>
public bool IsSaturated(IAtom atom, IAtomContainer ac)
{
var atomType = factory.GetAtomType(atom.AtomTypeName);
var lpCount = atomType.GetProperty <int>(CDKPropertyName.LonePairCount);
var foundLPCount = ac.GetConnectedLonePairs(atom).Count();
return(foundLPCount >= lpCount);
}
/// <summary>
/// get the electrostatic potential of the neighbours of a atom.
/// </summary>
/// <param name="ac">The IAtomContainer to study</param>
/// <param name="atom1">The position of the IAtom to study</param>
/// <param name="ds"></param>
/// <returns>The sum of electrostatic potential of the neighbours</returns>
private double GetElectrostaticPotentialN(IAtomContainer ac, int atom1, double[] ds)
{
// double CoulombForceConstant = 1/(4*Math.PI*8.81/*Math.Pow(10, -12)*/);
double CoulombForceConstant = 0.048;
double sum = 0.0;
try
{
var atoms = ac.GetConnectedAtoms(ac.Atoms[atom1]);
foreach (var atom in atoms)
{
double covalentradius = 0;
string symbol = atom.Symbol;
IAtomType type = factory.GetAtomType(symbol);
covalentradius = type.CovalentRadius.Value;
double charge = ds[StepSize * atom1 + atom1 + 5];
Debug.WriteLine($"sum_({sum}) = CFC({CoulombForceConstant})*Charge({charge}/ret({covalentradius}");
sum += CoulombForceConstant * charge / (covalentradius * covalentradius);
}
}
catch (CDKException e)
{
Debug.WriteLine(e);
}
return(sum);
}
public bool IsSaturated(IAtom atom, IAtomContainer container)
{
var type = atomTypeList.GetAtomType(atom.AtomTypeName);
if (type == null)
{
throw new CDKException($"Atom type is not a recognized CDK atom type: {atom.AtomTypeName}");
}
if (type.FormalNeighbourCount == null)
{
throw new CDKException($"Atom type is too general; cannot decide the number of implicit hydrogen to add for: {atom.AtomTypeName}");
}
if (type.GetProperty <object>(CDKPropertyName.PiBondCount) == null)
{
throw new CDKException($"Atom type is too general; cannot determine the number of pi bonds for: {atom.AtomTypeName}");
}
var bondOrderSum = container.GetBondOrderSum(atom);
var maxBondOrder = container.GetMaximumBondOrder(atom);
int?hcount = atom.ImplicitHydrogenCount == null ? 0 : atom.ImplicitHydrogenCount;
int piBondCount = type.GetProperty <int?>(CDKPropertyName.PiBondCount).Value;
int formalNeighborCount = type.FormalNeighbourCount.Value;
int typeMaxBondOrder = piBondCount + 1;
int typeBondOrderSum = formalNeighborCount + piBondCount;
if (bondOrderSum + hcount == typeBondOrderSum && maxBondOrder.Numeric() <= typeMaxBondOrder)
{
return(true);
}
return(false);
}
/// <inheritdoc/>
public void AddImplicitHydrogens(IAtomContainer container, IAtom atom)
{
if (atom.AtomTypeName == null)
{
throw new CDKException("IAtom is not typed! " + atom.Symbol);
}
if (string.Equals("X", atom.AtomTypeName, StringComparison.Ordinal))
{
if (atom.ImplicitHydrogenCount == null)
{
atom.ImplicitHydrogenCount = 0;
}
return;
}
var type = atomTypeList.GetAtomType(atom.AtomTypeName);
if (type == null)
{
throw new CDKException("Atom type is not a recognized CDK atom type: " + atom.AtomTypeName);
}
if (type.FormalNeighbourCount == null)
{
throw new CDKException($"Atom type is too general; cannot decide the number of implicit hydrogen to add for: {atom.AtomTypeName}");
}
// very simply counting: each missing explicit neighbor is a missing hydrogen
atom.ImplicitHydrogenCount = type.FormalNeighbourCount - container.GetConnectedBonds(atom).Count();
}
/// <summary>
/// Calculates the volume for the given <see cref="IAtomContainer"/>. This methods assumes
/// that atom types have been perceived.
/// </summary>
/// <param name="molecule"><see cref="IAtomContainer"/> to calculate the volume of.</param>
/// <returns>the volume in cubic Ångström.</returns>
public static double Calculate(IAtomContainer molecule)
{
double sum = 0.0;
int totalHCount = 0;
foreach (var atom in molecule.Atoms)
{
if (!bondiiVolumes.TryGetValue(atom.Symbol, out double bondiiVolume))
{
throw new CDKException("Unsupported element.");
}
sum += bondiiVolume;
// add volumes of implicit hydrogens?
var type = atomTypeList.GetAtomType(atom.AtomTypeName);
if (type == null)
{
throw new CDKException($"Unknown atom type for atom: {atom.Symbol}");
}
if (type.FormalNeighbourCount == null)
{
throw new CDKException($"Formal neighbor count not given for : {type.AtomTypeName}");
}
int hCount = type.FormalNeighbourCount.Value - molecule.GetConnectedBonds(atom).Count();
sum += hCount * bondiiVolumes["H"];
totalHCount += hCount;
}
sum -= 5.92 * (molecule.Bonds.Count + totalHCount);
Aromaticity.CDKLegacy.Apply(molecule);
var ringSet = Cycles.FindSSSR(molecule).ToRingSet();
if (ringSet.Count() > 0)
{
int aromRingCount = 0;
int nonAromRingCount = 0;
foreach (var ring in ringSet)
{
if (RingIsAromatic(ring))
{
aromRingCount++;
}
else
{
nonAromRingCount++;
}
}
sum -= 14.7 * aromRingCount;
sum -= 3.8 * nonAromRingCount;
}
return(sum);
}
/// <summary>
/// Read a Reaction from a file in MDL RXN format
/// </summary>
/// <returns>The Reaction that was read from the MDL file.</returns>
private IAtomContainer ReadMolecule(IAtomContainer molecule)
{
try
{
int atomCount = 0;
int bondCount = 0;
string line;
while (true)
{
line = input.ReadLine();
if (line == null)
{
return(null);
}
if (line.StartsWith("@<TRIPOS>MOLECULE", StringComparison.Ordinal))
{
break;
}
if (!line.StartsWithChar('#') && line.Trim().Length > 0)
{
break;
}
}
// ok, if we're coming from the chemfile function, we've already read the molecule RTI
if (firstLineisMolecule)
{
molecule.Title = line;
}
else
{
line = input.ReadLine();
molecule.Title = line;
}
// get atom and bond counts
var counts = input.ReadLine();
var tokenizer = Strings.Tokenize(counts);
try
{
atomCount = int.Parse(tokenizer[0], NumberFormatInfo.InvariantInfo);
}
catch (FormatException nfExc)
{
string error = "Error while reading atom count from MOLECULE block";
Trace.TraceError(error);
Debug.WriteLine(nfExc);
throw new CDKException(error, nfExc);
}
if (tokenizer.Count > 1)
{
try
{
bondCount = int.Parse(tokenizer[1], NumberFormatInfo.InvariantInfo);
}
catch (FormatException nfExc)
{
string error = "Error while reading atom and bond counts";
Trace.TraceError(error);
Debug.WriteLine(nfExc);
throw new CDKException(error, nfExc);
}
}
else
{
bondCount = 0;
}
Trace.TraceInformation("Reading #atoms: ", atomCount);
Trace.TraceInformation("Reading #bonds: ", bondCount);
// we skip mol type, charge type and status bit lines
Trace.TraceWarning("Not reading molecule qualifiers");
line = input.ReadLine();
bool molend = false;
while (line != null)
{
if (line.StartsWith("@<TRIPOS>MOLECULE", StringComparison.Ordinal))
{
molend = true;
break;
}
else if (line.StartsWith("@<TRIPOS>ATOM", StringComparison.Ordinal))
{
Trace.TraceInformation("Reading atom block");
for (int i = 0; i < atomCount; i++)
{
line = input.ReadLine().Trim();
if (line.StartsWith("@<TRIPOS>MOLECULE", StringComparison.Ordinal))
{
molend = true;
break;
}
tokenizer = Strings.Tokenize(line);
// disregard the id token
var nameStr = tokenizer[1];
var xStr = tokenizer[2];
var yStr = tokenizer[3];
var zStr = tokenizer[4];
var atomTypeStr = tokenizer[5];
// replace unrecognised atom type
if (ATOM_TYPE_ALIASES.ContainsKey(atomTypeStr))
{
atomTypeStr = ATOM_TYPE_ALIASES[atomTypeStr];
}
var atom = molecule.Builder.NewAtom();
IAtomType atomType;
try
{
atomType = atFactory.GetAtomType(atomTypeStr);
}
catch (Exception)
{
// ok, *not* an mol2 atom type
atomType = null;
}
// Maybe it is just an element
if (atomType == null && IsElementSymbol(atomTypeStr))
{
atom.Symbol = atomTypeStr;
}
else
{
if (atomType == null)
{
atomType = atFactory.GetAtomType("X");
Trace.TraceError($"Could not find specified atom type: {atomTypeStr}");
}
AtomTypeManipulator.Configure(atom, atomType);
}
atom.AtomicNumber = ChemicalElement.OfSymbol(atom.Symbol).AtomicNumber;
atom.Id = nameStr;
atom.AtomTypeName = atomTypeStr;
try
{
var x = double.Parse(xStr, NumberFormatInfo.InvariantInfo);
var y = double.Parse(yStr, NumberFormatInfo.InvariantInfo);
var z = double.Parse(zStr, NumberFormatInfo.InvariantInfo);
atom.Point3D = new Vector3(x, y, z);
}
catch (FormatException nfExc)
{
string error = "Error while reading atom coordinates";
Trace.TraceError(error);
Debug.WriteLine(nfExc);
throw new CDKException(error, nfExc);
}
molecule.Atoms.Add(atom);
}
}
else if (line.StartsWith("@<TRIPOS>BOND", StringComparison.Ordinal))
{
Trace.TraceInformation("Reading bond block");
for (int i = 0; i < bondCount; i++)
{
line = input.ReadLine();
if (line.StartsWith("@<TRIPOS>MOLECULE", StringComparison.Ordinal))
{
molend = true;
break;
}
tokenizer = Strings.Tokenize(line);
// disregard the id token
var atom1Str = tokenizer[1];
var atom2Str = tokenizer[2];
var orderStr = tokenizer[3];
try
{
var atom1 = int.Parse(atom1Str, NumberFormatInfo.InvariantInfo);
var atom2 = int.Parse(atom2Str, NumberFormatInfo.InvariantInfo);
if (string.Equals("nc", orderStr, StringComparison.Ordinal))
{
// do not connect the atoms
}
else
{
var bond = molecule.Builder.NewBond(molecule.Atoms[atom1 - 1], molecule.Atoms[atom2 - 1]);
switch (orderStr)
{
case "1":
bond.Order = BondOrder.Single;
break;
case "2":
bond.Order = BondOrder.Double;
break;
case "3":
bond.Order = BondOrder.Triple;
break;
case "am":
case "ar":
bond.Order = BondOrder.Single;
bond.IsAromatic = true;
bond.Begin.IsAromatic = true;
bond.End.IsAromatic = true;
break;
case "du":
bond.Order = BondOrder.Single;
break;
case "un":
bond.Order = BondOrder.Single;
break;
default:
break;
}
molecule.Bonds.Add(bond);
}
}
catch (FormatException nfExc)
{
var error = "Error while reading bond information";
Trace.TraceError(error);
Debug.WriteLine(nfExc);
throw new CDKException(error, nfExc);
}
}
}
if (molend)
{
return(molecule);
}
line = input.ReadLine();
}
}
catch (IOException exception)
{
var error = "Error while reading general structure";
Trace.TraceError(error);
Debug.WriteLine(exception);
throw new CDKException(error, exception);
}
return(molecule);
}
/// <summary>
/// Gets the atomicSoftnessCore attribute of the InductivePartialCharges object.
/// </summary>
/// <remarks>
/// this method returns the result of the core of the equation of atomic softness
/// that can be used for qsar descriptors and during the iterative calculation
/// of effective electronegativity
/// </remarks>
/// <param name="ac">AtomContainer</param>
/// <param name="atomPosition">position of target atom</param>
/// <returns>The atomicSoftnessCore value</returns>
/// <exception cref="CDKException"></exception>
public double GetAtomicSoftnessCore(IAtomContainer ac, int atomPosition)
{
IAtom target = null;
double core = 0;
double radiusTarget = 0;
target = ac.Atoms[atomPosition];
double partial = 0;
double radius = 0;
IAtomType type = null;
try
{
type = factory.GetAtomType(ac.Atoms[atomPosition].Symbol);
var n = ac.Atoms[atomPosition].AtomicNumber;
if (GetCovalentRadius(n, ac.GetMaximumBondOrder(target)) > 0)
{
radiusTarget = GetCovalentRadius(n, ac.GetMaximumBondOrder(target));
}
else
{
radiusTarget = type.CovalentRadius.Value;
}
}
catch (Exception ex1)
{
Debug.WriteLine(ex1);
throw new CDKException("Problems with AtomTypeFactory due to " + ex1.Message, ex1);
}
foreach (var atom in ac.Atoms)
{
if (!target.Equals(atom))
{
partial = 0;
try
{
type = factory.GetAtomType(atom.Symbol);
}
catch (Exception ex1)
{
Debug.WriteLine(ex1);
throw new CDKException($"Problems with AtomTypeFactory due to {ex1.Message}", ex1);
}
if (GetCovalentRadius(atom.AtomicNumber, ac.GetMaximumBondOrder(atom)) > 0)
{
radius = GetCovalentRadius(atom.AtomicNumber, ac.GetMaximumBondOrder(atom));
}
else
{
radius = type.CovalentRadius.Value;
}
partial += radius * radius;
partial += (radiusTarget * radiusTarget);
partial = partial / (CalculateSquaredDistanceBetweenTwoAtoms(target, atom));
core += partial;
}
}
core = 2 * core;
core = 0.172 * core;
return(core);
}
