--- trunk/OOPSE/libmdtools/Molecule.cpp	2003/03/31 21:50:59	438
+++ trunk/OOPSE/libmdtools/Molecule.cpp	2003/07/15 15:50:55	610
@@ -119,3 +119,82 @@ void Molecule::printMe( void ){
     myTorsions[i]->printMe();
   }
 }
+
+void Molecule::moveCOM(double delta[3]){
+  double aPos[3];
+  int i, j;
+
+  for(i=0; i<nAtoms; i++) {
+    if(myAtoms[i] != NULL ) {
+      
+      myAtoms[i]->getPos( aPos );
+      
+      for (j=0; j< 3; j++) 
+        aPos[j] += delta[j];
+
+      myAtoms[i]->setPos( aPos );
+    }
+  }
+}
+
+void Molecule::getCOM( double COM[3] ) {
+
+  double mass, mtot;
+  double aPos[3];
+  int i, j;
+
+  for (j=0; j<3; j++) 
+    COM[j] = 0.0;
+
+  mtot   = 0.0;
+
+  for (i=0; i < nAtoms; i++) {
+    if (myAtoms[i] != NULL) {
+
+      mass = myAtoms[i]->getMass();
+      mtot   += mass;
+      
+      myAtoms[i]->getPos( aPos );
+
+      for( j = 0; j < 3; j++) 
+        COM[j] += aPos[j] * mass;
+
+    }
+  }
+
+  for (j = 0; j < 3; j++) 
+    COM[j] /= mtot; 
+}
+
+double Molecule::getCOMvel( double COMvel[3] ) {
+
+  double mass, mtot;
+  double aVel[3];
+  int i, j;
+
+
+  for (j=0; j<3; j++) 
+    COMvel[j] = 0.0;
+
+  mtot   = 0.0;
+
+  for (i=0; i < nAtoms; i++) {
+    if (myAtoms[i] != NULL) {
+
+      mass = myAtoms[i]->getMass();
+      mtot   += mass;
+
+      myAtoms[i]->getVel(aVel);
+
+      for (j=0; j<3; j++) 
+        COMvel[j] += aVel[j]*mass;
+
+    }
+  }
+
+  for (j=0; j<3; j++) 
+    COMvel[j] /= mtot;
+ 
+  return mtot;
+
+}