Initial Work on Reading Crystal and Creation Gaussian Input

crystalpol/shared/system/molecule.py

@@ -0,0 +1,88 @@
+from crystalpol.shared.system.atom import Atom
+from crystalpol.shared.utils.ptable import atom_symbol
+
+from typing import Final, List, TextIO
+import math
+
+
+""" Constants of unit conversion """
+BOHR2ANG: Final[float] = 0.52917721092
+ANG2BOHR: Final[float] = 1 / BOHR2ANG
+
+
+class Molecule:
+    """
+    Molecule class declaration. This class is used throughout the DicePlayer program to represent molecules.
+
+    Atributes:
+        molname (str): The name of the represented molecule
+        atom (List[Atom]): List of atoms of the represented molecule
+        position (NDArray[Any, Any]): The position relative to the internal atoms of the represented molecule
+        energy (NDArray[Any, Any]): The energy of the represented molecule
+        gradient (NDArray[Any, Any]): The first derivative of the energy relative to the position
+        hessian (NDArray[Any, Any]): The second derivative of the energy relative to the position
+        total_mass (int): The total mass of the molecule
+        com (NDArray[Any, Any]): The center of mass of the molecule
+    """
+
+    __slots__ = (
+        'mol_name',
+        'atoms',
+        'position',
+        'energy',
+        'gradient',
+        'hessian',
+        'total_mass',
+        'com'
+    )
+
+    def __init__(self, mol_name: str) -> None:
+        """
+        The constructor function __init__ is used to create new instances of the Molecule class.
+
+        Args:
+            mol_name (str): Molecule name
+        """
+        self.mol_name: str = mol_name
+
+        self.atoms: List[Atom] = []
+
+    def __iter__(self):
+        for atom in self.atoms:
+            yield atom
+
+    def add_atom(self, a: Atom) -> None:
+        """
+        Adds Atom instance to the molecule.
+
+        Args:
+            a (Atom): Atom instance to be added to atom list.
+        """
+
+        self.atoms.append(a)
+
+    def update_charges(self, charges: List[float]) -> None:
+
+        if len(charges) != len(self.atoms):
+            raise ValueError(
+                f"The number of charges ({len(charges)}) does not match the number of atoms ({len(self.atoms)})"
+            )
+
+        for i, atom in enumerate(self.atoms):
+            atom.chg = charges[i]
+
+    def print_mol_info(self, fh: TextIO) -> None:
+        """
+        Prints the Molecule information into a Output File
+
+        Args:
+            fh (TextIO): Output File
+        """
+
+        fh.write("-"*80)
+        fh.write(f"Molecule Name: {self.mol_name}\n")
+
+        fh.write("\n")
+
+        for atom in self.atoms:
+            fh.write(f"{atom_symbol[atom.na]}   r: [{atom.rx}, {atom.ry}, {atom.rz}]    charge: {atom.chg}")