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/**********************************************************************
obrotamer.cpp - Generate a random rotamer for a given molecule
Copyright (C) 2005-2006 Geoffrey R. Hutchison
This file is part of the Open Babel project.
For more information, see <http://openbabel.sourceforge.net/>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
***********************************************************************/
// used to set import/export for Cygwin DLLs
#ifdef WIN32
#define USING_OBDLL
#endif
#include <openbabel/babelconfig.h>
#include <openbabel/mol.h>
#include <openbabel/obconversion.h>
#include <openbabel/rotamer.h>
#include <openbabel/rotor.h>
#include <openbabel/obutil.h>
#include <stdio.h>
#include <iostream>
#include <fstream>
using namespace std;
using namespace OpenBabel;
int main(int argc,char *argv[])
{
if (argc != 2)
{
cout << "Usage: obrotamer <file>" << endl;
cout << " Outputs the number of rotable bonds and generate a random"
<< " rotamer" << endl;
return(-1);
}
ifstream ifs(argv[1]);
if (!ifs)
{
cerr << "Error! Cannot read input file!" << endl;
return(-1);
}
OBConversion conv(&ifs, &cout);
OBFormat* pFormat;
pFormat = conv.FormatFromExt(argv[1]);
if ( pFormat == NULL )
{
cerr << "Error! Cannot read file format!" << endl;
return(-1);
}
// Finally, we can do some work!
OBMol mol;
if (! conv.SetInAndOutFormats(pFormat, pFormat))
{
cerr << "Error! File format isn't loaded" << endl;
return (-1);
}
OBRotorList rl;
OBRotamerList rotamers;
int *rotorKey = NULL;
OBRandom rand;
rand.TimeSeed();
while(ifs.peek() != EOF && ifs.good())
{
mol.Clear();
conv.Read(&mol);
rl.Setup(mol);
cerr << " Number of rotatable bonds: " << rl.Size() << endl;
// indexed from 1, rotorKey[0] = 0
std::vector<int> rotorKey(rl.Size() + 1, 0);
// each entry represents the configuration of a rotor
// e.g. indexes into OBRotor::GetResolution()
// (the different angles to sample from the OBRotorRules database)
OBRotorIterator ri;
OBRotor *rotor = rl.BeginRotor(ri);
for (int i = 1; i < rl.Size() + 1; ++i, rotor = rl.NextRotor(ri))
rotorKey[i] = rand.NextInt() % rotor->GetResolution().size();
rotamers.SetBaseCoordinateSets(mol);
rotamers.Setup(mol, rl);
rotamers.AddRotamer(rotorKey);
// This is more useful when you have added many rotamers
// rather than the one in this example
rotamers.ExpandConformerList(mol, mol.GetConformers());
// Change the molecule conformation -- from 0 .. rotamers.NumRotamers()
mol.SetConformer(0);
conv.Write(&mol);
} // while reading molecules
return(0);
}
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