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#include "obtest.h"
#include <openbabel/obconversion.h>
#include <openbabel/math/align.h>
#include <openbabel/math/matrix3x3.h>
#include <openbabel/builder.h>
using namespace std;
using namespace OpenBabel;
typedef vector<vector3> vv3;
std::string GetFilename(const std::string &filename)
{
string path = TESTDATADIR + filename;
return path;
}
void test_simpleAlign()
{
// |
// c | b e
// |
// |
// ---------+------------------------------
// |
// |
// a | d
// |
//
vector3 a(-1, -1, 0), b(1, 1, 0), c(-1, 1, 0), d(1, -1, 0), e(sqrt(8.) + 1, 1, 0);
vv3 ref(2), target(2), result;
ref[0] = d; ref[1] = c;
// Align dc to dc
target[0] = d; target[1] = c;
OBAlign align(ref, target);
align.Align();
result = align.GetAlignment();
OB_ASSERT( result[0].IsApprox(ref[0], 1.0E-08) );
OB_ASSERT( result[1].IsApprox(ref[1], 1.0E-08) );
OB_ASSERT( fabs(align.GetRMSD()) < 1.0E-08 );
// Align ab to dc
target[0] = a; target[1] = b;
align.SetTarget(target);
align.Align();
result = align.GetAlignment();
OB_ASSERT( result[0].IsApprox(ref[0], 1.0E-08) );
OB_ASSERT( result[1].IsApprox(ref[1], 1.0E-08) );
OB_ASSERT( fabs(align.GetRMSD()) < 1.0E-08 );
// Align be to dc
target[0] = b; target[1] = e;
align.SetTarget(target);
align.Align();
result = align.GetAlignment();
OB_ASSERT( result[0].IsApprox(ref[0], 1.0E-08) );
OB_ASSERT( result[1].IsApprox(ref[1], 1.0E-08) );
OB_ASSERT( fabs(align.GetRMSD()) < 1.0E-08 );
// Align bd to ac
ref[0] = a; ref[1] = c;
target[0] = b; target[1] = d;
align.SetRef(ref);
align.SetTarget(target);
align.Align();
result = align.GetAlignment();
OB_ASSERT( result[0].IsApprox(ref[0], 1.0E-08) );
OB_ASSERT( result[1].IsApprox(ref[1], 1.0E-08) );
OB_ASSERT( fabs(align.GetRMSD()) < 1.0E-08 );
// Verify that using GetRotMatrix() works to rotate bd onto ac
matrix3x3 rot = align.GetRotMatrix();
vector<vector3> centroids;
centroids.push_back( (b + d) / 2);
centroids.push_back( (a + c) / 2);
for (int i = 0; i<2; ++i) {
vector3 aligned = target[i] - centroids[0];
aligned *= rot;
aligned += centroids[1];
OB_ASSERT( aligned.IsApprox(ref[i], 1.0E-08) );
}
}
void test_RMSD()
{
// c |
// | b e
// |
// |
// ---------+------------------------------
// |
// |
// a | d
// |
//
vector3 a(-1, -1, 0), b(1, 1, 0), c(-1, 1.1, 0), d(1, -1, 0), e(sqrt(8.) + 1, 1, 0);
double rmsd;
vv3 ref(2), target(2);
ref[0] = d; ref[1] = b;
// Align ac to db
target[0] = a; target[1] = c;
OBAlign align(ref, target);
align.Align();
rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd - 0.05) < 1.0E-06 );
}
void test_alignMol(){
OBConversion conv;
bool success = conv.SetInFormat("xyz");
OB_REQUIRE( success );
OBMol mol;
success = conv.ReadFile(&mol, TESTDATADIR + string("test3d.xyz"));
OB_REQUIRE( success );
// Align molecule to itself (not using symmetry)
OBAlign align = OBAlign(mol, mol, true, false);
align.Align();
double rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) < 1.0E-6 );
// Rotate molecule and align it to itself
OBMol mol_b = mol;
matrix3x3 rot;
rot.RotAboutAxisByAngle(vector3(1.0, -0.3, 0.23), 67);
double rot_array[9];
rot.GetArray(rot_array);
mol_b.Rotate(rot_array);
// Assert that rotation has occured
OB_ASSERT( !mol_b.GetAtom(1)->GetVector().IsApprox(mol.GetAtom(1)->GetVector(), 1.0E-8) );
align.SetTargetMol(mol_b);
align.Align();
rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) < 1.0E-6 );
}
void test_alignMolWithSym(){
OBConversion conv;
OB_REQUIRE( conv.SetInFormat("smi") );
OBMol mol;
OB_REQUIRE( conv.ReadString(&mol, "ClC(=O)Cl") );
OBBuilder builder;
OB_REQUIRE( builder.Build(mol) );
// Offset Atom#1
OBAtom *patom = mol.GetAtom(1);
patom->SetVector( patom->GetVector() + vector3(.1, .1, .1) );
OBMol mol_b = mol;
// Align mol to mol_b
OBAlign align = OBAlign(mol, mol_b, true, true);
align.Align();
double rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) < 1.0E-6 );
// Swap atom #1 and #4 in mol_b, and align again (also with symmetry)
vector<int> a(4);
a[0] = 4; a[1] = 2; a[2] = 3; a[3] = 1;
mol_b.RenumberAtoms(a);
align.SetTargetMol(mol_b);
align.Align();
rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) < 1.0E-6 );
// Now align without symmetry
align = OBAlign(mol, mol_b, true, false);
align.Align();
rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) > 1.0E-2 );
}
void test_alignWithoutHydrogens() {
OBConversion conv;
bool success = conv.SetInFormat("xyz");
OB_REQUIRE( success );
OBMol mol;
success = conv.ReadFile(&mol, TESTDATADIR + string("test3d.xyz"));
OB_REQUIRE( success );
// Align molecule to itself without hydrogens
OBAlign align = OBAlign(mol, mol, false, false);
align.Align();
double rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) < 1.0E-6 );
// Move one of the hydrogens and rotate molecule
OBMol clone = mol;
OBAtom *atom = clone.GetAtom(8);
OB_REQUIRE( atom->IsHydrogen() );
atom->SetVector(atom->GetVector() + vector3(0.1, 0.1, 0.1));
matrix3x3 rot;
rot.RotAboutAxisByAngle(vector3(1.0, -0.3, 0.23), 67);
double rot_array[9];
rot.GetArray(rot_array);
clone.Rotate(rot_array);
// Assert that rotation has occured
OB_ASSERT( !clone.GetAtom(1)->GetVector().IsApprox(mol.GetAtom(1)->GetVector(), 1.0E-8) );
// Align molecule to clone, with hydrogens
align = OBAlign(mol, clone, true, false);
align.Align();
rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) > 1.0E-3 );
vector<vector3> result = align.GetAlignment();
OB_ASSERT( result.size() == mol.NumAtoms() );
// Align molecule to clone, without hydrogens
align = OBAlign(mol, clone, false, false);
align.Align();
rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) < 1.0E-6 );
result = align.GetAlignment();
OB_ASSERT( result.size() == mol.NumAtoms() );
OB_ASSERT( result.at(0).IsApprox( mol.GetAtom(1)->GetVector(), 1.0E-8 ) );
// Align molecule to clone, without hydrogens but with sym
align = OBAlign(mol, clone, false, true);
align.Align();
rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) < 1.0E-6 );
result = align.GetAlignment();
OB_ASSERT( result.size() == mol.NumAtoms() );
OB_ASSERT( result.at(0).IsApprox( mol.GetAtom(1)->GetVector(), 1.0E-8 ) );
}
void test_alignWithSymWithoutHydrogens() {
OBConversion conv;
bool success = conv.SetInFormat("smi");
OB_REQUIRE( success );
OBMol mol;
success = conv.ReadString(&mol, "BrCC(Cl)(Cl)Cl");
OB_REQUIRE( success );
OBBuilder builder;
OB_REQUIRE( builder.Build(mol) );
mol.AddHydrogens();
// Rotate the CCl3
OBMol clone = mol;
double ang = mol.GetTorsion(1, 2, 3, 4);
clone.SetTorsion( clone.GetAtom(1), clone.GetAtom(2), clone.GetAtom(3), clone.GetAtom(4), (ang + 120) * DEG_TO_RAD );
// Align molecule to clone with hydrogens and without sym
OBAlign align = OBAlign(mol, clone, true, false);
align.Align();
double rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) > 1.2 );
// Align molecule to clone with hydrogens and with sym
align = OBAlign(mol, clone, true, true);
align.Align();
rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) < 0.017 );
// Align molecule to clone without hydrogens and with sym
align = OBAlign(mol, clone, false, true);
align.Align();
rmsd = align.GetRMSD();
OB_ASSERT( fabs(rmsd) < 0.019 );
}
void test_bug()
{
// Multiplying by GetRotMatrix() was not giving the same answer as
// GetAlignment(). I finally figured out why with this test case.
// The matrix3x3 should have been returned as the transpose.
vector3 a(-1.0560719999999999, 0.070211999999999997, -0.10441499999999999);
vector3 b(-2.4428160000000001,-0.82010000000000005,-1.1872100000000001);
vector3 c(-3.1217000000000001,-0.24128900000000000,-2.0887270000000000);
vector3 d(-0.13895900000000000,-0.65032000000000001,0.081436999999999996);
vector3 e(-1.4315770000000001,-1.9259770000000001,-0.66990700000000003);
vector3 f(-1.1263280000000000,-3.0768879999999998,-1.1025430000000001);
vv3 ref(3), target(3), result;
ref[0] = a; ref[1] = b; ref[2] = c;
target[0] = d; target[1] = e; target[2] = f;
OBAlign align(ref, target);
align.Align();
result = align.GetAlignment();
OB_ASSERT( fabs(align.GetRMSD()) < 0.04 );
// Verify that using GetRotMatrix() gives the same answer as GetAlignment()
matrix3x3 rot = align.GetRotMatrix();
vector<vector3> centroids;
centroids.push_back( (d + e + f) / 3);
centroids.push_back( (a + b + c) / 3);
for (int i = 0; i<3; ++i) {
vector3 tmp = target[i] - centroids[0];
tmp *= rot;
vector3 aligned = tmp + centroids[1];
OB_ASSERT( aligned.IsApprox(result[i], 1.0E-08) );
}
}
int main()
{
// Define location of file formats for testing
#ifdef FORMATDIR
char env[BUFF_SIZE];
snprintf(env, BUFF_SIZE, "BABEL_LIBDIR=%s", FORMATDIR);
putenv(env);
#endif
test_bug();
test_simpleAlign();
test_RMSD();
test_alignMol();
test_alignMolWithSym();
test_alignWithoutHydrogens();
test_alignWithSymWithoutHydrogens();
return 0;
}
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