Chimie Théorique » QMX

# encoding: utf-8

"calculator.py - module for choosing a calculator."

import gtk

import os

import numpy as np

from copy import copy

from ase.gui.setupwindow import SetupWindow

from ase.gui.progress import DefaultProgressIndicator, GpawProgressIndicator

from ase.gui.widgets import pack, oops, cancel_apply_ok

from ase import Atoms

from ase.data import chemical_symbols

import ase

# Asap and GPAW may be imported if selected.

introtext = """\

To make most calculations on the atoms, a Calculator object must first

be associated with it.  ASE supports a number of calculators, supporting

different elements, and implementing different physical models for the

interatomic interactions.\

"""

# Informational text about the calculators

lj_info_txt = """\

The Lennard-Jones pair potential is one of the simplest

possible models for interatomic interactions, mostly

suitable for noble gasses and model systems.

Interactions are described by an interaction length and an

interaction strength.\

"""

emt_info_txt = """\

The EMT potential is a many-body potential, giving a

good description of the late transition metals crystalling

in the FCC crystal structure.  The elements described by the

main set of EMT parameters are Al, Ni, Cu, Pd, Ag, Pt, and

Au, the Al potential is however not suitable for materials

science application, as the stacking fault energy is wrong.

A number of parameter sets are provided.

<b>Default parameters:</b>

The default EMT parameters, as published in K. W. Jacobsen,

P. Stoltze and J. K. Nørskov, <i>Surf. Sci.</i> <b>366</b>, 394 (1996).

<b>Alternative Cu, Ag and Au:</b>

An alternative set of parameters for Cu, Ag and Au,

reoptimized to experimental data including the stacking

fault energies by Torben Rasmussen (partly unpublished).

<b>Ruthenium:</b>

Parameters for Ruthenium, as published in J. Gavnholt and

J. Schiøtz, <i>Phys. Rev. B</i> <b>77</b>, 035404 (2008).

<b>Metallic glasses:</b>

Parameters for MgCu and CuZr metallic glasses. MgCu

parameters are in N. P. Bailey, J. Schiøtz and

K. W. Jacobsen, <i>Phys. Rev. B</i> <b>69</b>, 144205 (2004).

CuZr in A. Paduraru, A. Kenoufi, N. P. Bailey and

J. Schiøtz, <i>Adv. Eng. Mater.</i> <b>9</b>, 505 (2007).

"""

aseemt_info_txt = """\

The EMT potential is a many-body potential, giving a

good description of the late transition metals crystalling

in the FCC crystal structure.  The elements described by the

main set of EMT parameters are Al, Ni, Cu, Pd, Ag, Pt, and

Au.  In addition, this implementation allows for the use of

H, N, O and C adatoms, although the description of these is

most likely not very good.

<b>This is the ASE implementation of EMT.</b> For large

simulations the ASAP implementation is more suitable; this

implementation is mainly to make EMT available when ASAP is

not installed.

"""

brenner_info_txt = """\

The Brenner potential is a reactive bond-order potential for

carbon and hydrocarbons.  As a bond-order potential, it takes

into account that carbon orbitals can hybridize in different

ways, and that carbon can form single, double and triple

bonds.  That the potential is reactive means that it can

handle gradual changes in the bond order as chemical bonds

are formed or broken.

The Brenner potential is implemented in Asap, based on a

C implentation published at http://www.rahul.net/pcm/brenner/ .

The potential is documented here:

  Donald W Brenner, Olga A Shenderova, Judith A Harrison,

  Steven J Stuart, Boris Ni and Susan B Sinnott:

  "A second-generation reactive empirical bond order (REBO)

  potential energy expression for hydrocarbons",

  J. Phys.: Condens. Matter 14 (2002) 783-802.

  doi: 10.1088/0953-8984/14/4/312

"""

gpaw_info_txt = """\

GPAW implements Density Functional Theory using a

<b>G</b>rid-based real-space representation of the wave

functions, and the <b>P</b>rojector <b>A</b>ugmented <b>W</b>ave

method for handling the core regions.

"""

aims_info_txt = """\

FHI-aims is an external package implementing density

functional theory and quantum chemical methods using

all-electron methods and a numeric local orbital basis set.

For full details, see http://www.fhi-berlin.mpg.de/aims/

or Comp. Phys. Comm. v180 2175 (2009). The ASE

documentation contains information on the keywords and

functionalities available within this interface.

"""

aims_pbc_warning_text = """\

WARNING:

Your system seems to have more than zero but less than

three periodic dimensions. Please check that this is

really what you want to compute. Assuming full

3D periodicity for this calculator."""

vasp_info_txt = """\

VASP is an external package implementing density

functional functional theory using pseudopotentials

or the projector-augmented wave method together

with a plane wave basis set. For full details, see

http://cms.mpi.univie.ac.at/vasp/vasp/

"""

emt_parameters = (

    ("Default (Al, Ni, Cu, Pd, Ag, Pt, Au)", None),

    ("Alternative Cu, Ag and Au", "EMTRasmussenParameters"),

    ("Ruthenium", "EMThcpParameters"),

    ("CuMg and CuZr metallic glass", "EMTMetalGlassParameters")

    )

class SetCalculator(SetupWindow):

    "Window for selecting a calculator."

    # List the names of the radio button attributes

    radios = ("none", "lj", "emt", "aseemt", "brenner", "gpaw", "aims", "vasp")

    # List the names of the parameter dictionaries

    paramdicts = ("lj_parameters",)

    # The name used to store parameters on the gui object

    classname = "SetCalculator"

    def __init__(self, gui):

        SetupWindow.__init__(self)

        self.set_title("Select calculator")

        vbox = gtk.VBox()

        # Intoductory text

        self.packtext(vbox, introtext)

        pack(vbox, [gtk.Label("Calculator:")])

        # No calculator (the default)

        self.none_radio = gtk.RadioButton(None, "None")

        pack(vbox, [self.none_radio])

        # Lennard-Jones

        self.lj_radio = gtk.RadioButton(self.none_radio, "Lennard-Jones (ASAP)")

        self.lj_setup = gtk.Button("Setup")

        self.lj_info = InfoButton(lj_info_txt)

        self.lj_setup.connect("clicked", self.lj_setup_window)

        self.pack_line(vbox, self.lj_radio, self.lj_setup, self.lj_info)

        # EMT

        self.emt_radio = gtk.RadioButton(

            self.none_radio, "EMT - Effective Medium Theory (ASAP)")

        self.emt_setup = gtk.combo_box_new_text()

        self.emt_param_info = {}

        for p in emt_parameters:

            self.emt_setup.append_text(p[0])

            self.emt_param_info[p[0]] = p[1]

        self.emt_setup.set_active(0)

        self.emt_info = InfoButton(emt_info_txt)

        self.pack_line(vbox, self.emt_radio, self.emt_setup, self.emt_info)

        # EMT (ASE implementation)

        self.aseemt_radio = gtk.RadioButton(

            self.none_radio, "EMT - Effective Medium Theory (ASE)")

        self.aseemt_info = InfoButton(aseemt_info_txt)

        self.pack_line(vbox, self.aseemt_radio, None, self.aseemt_info)

        # Brenner potential

        self.brenner_radio = gtk.RadioButton(

            self.none_radio, "Brenner Potential (ASAP)")

        self.brenner_info = InfoButton(brenner_info_txt)

        self.pack_line(vbox, self.brenner_radio, None, self.brenner_info)

        # GPAW

        self.gpaw_radio = gtk.RadioButton(self.none_radio,

                                          "Density Functional Theory (GPAW)")

        self.gpaw_setup = gtk.Button("Setup")

        self.gpaw_info = InfoButton(gpaw_info_txt)

        self.gpaw_setup.connect("clicked", self.gpaw_setup_window)

        self.pack_line(vbox, self.gpaw_radio, self.gpaw_setup, self.gpaw_info)

        # FHI-aims

        self.aims_radio = gtk.RadioButton(self.none_radio,

                                          "Density Functional Theory (FHI-aims)")

        self.aims_setup = gtk.Button("Setup")

        self.aims_info = InfoButton(aims_info_txt)

        self.aims_setup.connect("clicked", self.aims_setup_window)

        self.pack_line(vbox, self.aims_radio, self.aims_setup, self.aims_info)

        # VASP

        self.vasp_radio = gtk.RadioButton(self.none_radio,

                                          "Density Functional Theory (VASP)")

        self.vasp_setup = gtk.Button("Setup")

        self.vasp_info = InfoButton(vasp_info_txt)

        self.vasp_setup.connect("clicked", self.vasp_setup_window)

        self.pack_line(vbox, self.vasp_radio, self.vasp_setup, self.vasp_info)

        # Buttons etc.

        pack(vbox, gtk.Label(""))

        buts = cancel_apply_ok(cancel=lambda widget: self.destroy(),

                               apply=self.apply,

                               ok=self.ok)

        pack(vbox, [buts], end=True, bottom=True)

        self.check = gtk.CheckButton("Check that the calculator is reasonable.")

        self.check.set_active(True)

        fr = gtk.Frame()

        fr.add(self.check)

        fr.show_all()

        pack(vbox, [fr], end=True, bottom=True)

        # Finalize setup

        self.add(vbox)

        vbox.show()

        self.show()

        self.gui = gui

        self.load_state()

    def pack_line(self, box, radio, setup, info):

        hbox = gtk.HBox()

        hbox.pack_start(radio, 0, 0)

        hbox.pack_start(gtk.Label("  "), 0, 0)

        hbox.pack_end(info, 0, 0)

        if setup is not None:

            radio.connect("toggled", self.radio_toggled, setup)

            setup.set_sensitive(False)

            hbox.pack_end(setup, 0, 0)

        hbox.show_all()

        box.pack_start(hbox, 0, 0)

    def radio_toggled(self, radio, button):

        button.set_sensitive(radio.get_active())

    def lj_setup_window(self, widget):

        if not self.get_atoms():

            return

        lj_param = getattr(self, "lj_parameters", None)

        LJ_Window(self, lj_param, "lj_parameters")

        # When control is retuned, self.lj_parameters has been set.

    def gpaw_setup_window(self, widget):

        if not self.get_atoms():

            return

        gpaw_param = getattr(self, "gpaw_parameters", None)

        GPAW_Window(self, gpaw_param, "gpaw_parameters")

        # When control is retuned, self.gpaw_parameters has been set.

    def aims_setup_window(self, widget):

        if not self.get_atoms():

            return

        aims_param = getattr(self, "aims_parameters", None)

        AIMS_Window(self, aims_param, "aims_parameters")

        # When control is retuned, self.aims_parameters has been set.

    def vasp_setup_window(self, widget):

        if not self.get_atoms():

            return

        vasp_param = getattr(self, "vasp_parameters", None)

        VASP_Window(self, vasp_param, "vasp_parameters")

        # When control is retuned, self.vasp_parameters has been set.

    def get_atoms(self):

        "Make an atoms object from the active image"

        images = self.gui.images

        if images.natoms < 1:

            oops("No atoms present")

            return False

        self.atoms = Atoms(positions=images.P[0], symbols=images.Z,

                           cell=images.A[0], pbc=images.pbc)

        if not images.dynamic.all():

            from ase.constraints import FixAtoms

            self.atoms.set_constraint(FixAtoms(mask=1-images.dynamic))

        return True

    def apply(self, *widget):

        if self.do_apply():

            self.save_state()

            return True

        else:

            return False

    def do_apply(self):

        nochk = not self.check.get_active()

        self.gui.simulation["progress"] = DefaultProgressIndicator()

        if self.none_radio.get_active():

            self.gui.simulation['calc'] = None

            return True

        elif self.lj_radio.get_active():

            if nochk or self.lj_check():

                self.choose_lj()

                return True

        elif self.emt_radio.get_active():

            if nochk or self.emt_check():

                self.choose_emt()

                return True

        elif self.aseemt_radio.get_active():

            if nochk or self.aseemt_check():

                self.choose_aseemt()

                return True

        elif self.brenner_radio.get_active():

            if nochk or self.brenner_check():

                self.choose_brenner()

                return True

        elif self.gpaw_radio.get_active():

            if nochk or self.gpaw_check():

                self.choose_gpaw()

                return True

        elif self.aims_radio.get_active():

            if nochk or self.aims_check():

                self.choose_aims()

                return True

        elif self.vasp_radio.get_active():

            if nochk or self.vasp_check():

                self.choose_vasp()

                return True

        return False

    def ok(self, *widget):

        if self.apply():

            self.destroy()

    def save_state(self):

        state = {}

        for r in self.radios:

            radiobutton = getattr(self, r+"_radio")

            if radiobutton.get_active():

                state["radio"] = r

        state["emtsetup"] = self.emt_setup.get_active()

        state["check"] = self.check.get_active()

        for p in self.paramdicts:

            if hasattr(self, p):

                state[p] = getattr(self, p)

        self.gui.module_state[self.classname] = state

    def load_state(self):

        try:

            state = self.gui.module_state[self.classname]

        except KeyError:

            return

        r = state["radio"]

        radiobutton = getattr(self, r+"_radio")

        radiobutton.set_active(True)

        self.emt_setup.set_active(state["emtsetup"])

        self.check.set_active(state["check"])

        for p in self.paramdicts:

            if state.has_key(p):

                setattr(self, p, state[p])

    def lj_check(self):

        try:

            import asap3

        except ImportError:

            oops("ASAP is not installed. (Failed to import asap3)")

            return False

        if not hasattr(self, "lj_parameters"):

            oops("You must set up the Lennard-Jones parameters")

            return False

        try:

            self.atoms.set_calculator(asap3.LennardJones(**self.lj_parameters))

        except (asap3.AsapError, TypeError, ValueError), e:

            oops("Could not create useful Lennard-Jones calculator.",

                 str(e))

            return False

        return True

    def choose_lj(self):

        # Define a function on the fly!

        import asap3

        def lj_factory(p=self.lj_parameters, lj=asap3.LennardJones):

            return lj(**p)

        self.gui.simulation["calc"] = lj_factory

    def emt_get(self):

        import asap3

        provider_name = self.emt_setup.get_active_text()

        provider =  self.emt_param_info[provider_name]

        if provider is not None:

            provider = getattr(asap3, provider)

        return (asap3.EMT, provider, asap3)

    def emt_check(self):

        if not self.get_atoms():

            return False

        try:

            emt, provider, asap3 = self.emt_get()

        except ImportError:

            oops("ASAP is not installed. (Failed to import asap3)")

            return False

        try:

            if provider is not None:

                self.atoms.set_calculator(emt(provider()))

            else:

                self.atoms.set_calculator(emt())

        except (asap3.AsapError, TypeError, ValueError), e:

            oops("Could not attach EMT calculator to the atoms.",

                 str(e))

            return False

        return True

    def choose_emt(self):

        emt, provider, asap3 = self.emt_get()

        if provider is None:

            emt_factory = emt

        else:

            def emt_factory(emt=emt, prov=provider):

                return emt(prov())

        self.gui.simulation["calc"] = emt_factory

    def aseemt_check(self):

        return self.element_check("ASE EMT", ['H', 'Al', 'Cu', 'Ag', 'Au',

                                              'Ni', 'Pd', 'Pt', 'C', 'N', 'O'])

    def choose_aseemt(self):

        self.gui.simulation["calc"] = ase.EMT

        ase.EMT.disabled = False  # In case Asap has been imported.

    def brenner_check(self):

        try:

            import asap3

        except ImportError:

            oops("ASAP is not installed. (Failed to import asap3)")

            return False

        return self.element_check("Brenner potential", ['H', 'C', 'Si'])

    def choose_brenner(self):

        import asap3

        self.gui.simulation["calc"] = asap3.BrennerPotential

    def choose_aseemt(self):

        self.gui.simulation["calc"] = ase.EMT

        ase.EMT.disabled = False  # In case Asap has been imported.

    def gpaw_check(self):

        try:

            import gpaw

        except ImportError:

            oops("GPAW is not installed. (Failed to import gpaw)")

            return False

        if not hasattr(self, "gpaw_parameters"):

            oops("You must set up the GPAW parameters")

            return False

        return True

    def choose_gpaw(self):

        # This reuses the same GPAW object.

        try:

            import gpaw

        except ImportError:

            oops("GPAW is not installed. (Failed to import gpaw)")

            return False

        p = self.gpaw_parameters

        use = ["xc", "kpts", "mode"]

        if p["use_h"]:

            use.append("h")

        else:

            use.append("gpts")

        if p["mode"] == "lcao":

            use.append("basis")

        gpaw_param = {}

        for s in use:

            gpaw_param[s] = p[s]

        if p["use mixer"]:

            mx = getattr(gpaw, p["mixer"])

            mx_args = {}

            mx_arg_n = ["beta", "nmaxold", "weight"]

            if p["mixer"] == "MixerDiff":

                mx_arg_n.extend(["beta_m", "nmaxold_m", "weight_m"])

            for s in mx_arg_n:

                mx_args[s] = p[s]

            gpaw_param["mixer"] = mx(**mx_args)

        progress = GpawProgressIndicator()

        self.gui.simulation["progress"] = progress

        gpaw_param["txt"] = progress.get_gpaw_stream()

        gpaw_calc = gpaw.GPAW(**gpaw_param)

        def gpaw_factory(calc = gpaw_calc):

            return calc

        self.gui.simulation["calc"] = gpaw_factory

    def aims_check(self):

        if not hasattr(self, "aims_parameters"):

            oops("You must set up the FHI-aims parameters")

            return False

        return True

    def choose_aims(self):

        param = self.aims_parameters

        from ase.calculators.aims import Aims

        calc_aims = Aims(**param)

        def aims_factory(calc = calc_aims):

            return calc

        self.gui.simulation["calc"] = aims_factory

    def vasp_check(self):

        if not hasattr(self, "vasp_parameters"):

            oops("You must set up the VASP parameters")

            return False

        return True

    def choose_vasp(self):

        param = self.vasp_parameters

        from ase.calculators.vasp import Vasp

        calc_vasp = Vasp(**param)

        def vasp_factory(calc = calc_vasp):

            return calc

        self.gui.simulation["calc"] = vasp_factory

    def element_check(self, name, elements):

        "Check that all atoms are allowed"

        elements = [ase.data.atomic_numbers[s] for s in elements]

        elements_dict = {}

        for e in elements:

            elements_dict[e] = True

        if not self.get_atoms():

            return False

        try:

            for e in self.atoms.get_atomic_numbers():

                elements_dict[e]

        except KeyError:

            oops("Element %s is not allowed by the '%s' calculator"

                 % (ase.data.chemical_symbols[e], name))

            return False

        return True

class InfoButton(gtk.Button):

    def __init__(self, txt):

        gtk.Button.__init__(self, "Info")

        self.txt = txt

        self.connect('clicked', self.run)

    def run(self, widget):

        dialog = gtk.MessageDialog(flags=gtk.DIALOG_MODAL,

                                   type=gtk.MESSAGE_INFO,

                                   buttons=gtk.BUTTONS_CLOSE)

        dialog.set_markup(self.txt)

        dialog.connect('response', lambda x, y: dialog.destroy())

        dialog.show()

class LJ_Window(gtk.Window):

    def __init__(self, owner, param, attrname):

        gtk.Window.__init__(self)

        self.set_title("Lennard-Jones parameters")

        self.owner = owner

        self.attrname = attrname

        atoms = owner.atoms

        atnos = atoms.get_atomic_numbers()

        found = {}

        for z in atnos:

            found[z] = True

        self.present = found.keys()

        self.present.sort()  # Sorted list of atomic numbers

        nelem = len(self.present)

        vbox = gtk.VBox()

        label = gtk.Label("Specify the Lennard-Jones parameters here")

        pack(vbox, [label])

        pack(vbox, gtk.Label(""))

        pack(vbox, [gtk.Label("Epsilon (eV):")])

        tbl, self.epsilon_adj = self.makematrix(self.present)

        pack(vbox, [tbl])

        pack(vbox, gtk.Label(""))

        pack(vbox, [gtk.Label("Sigma (Å):")])

        tbl, self.sigma_adj = self.makematrix(self.present)

        pack(vbox, [tbl])

        self.modif = gtk.CheckButton("Shift to make smooth at cutoff")

        self.modif.set_active(True)

        pack(vbox, gtk.Label(""))

        pack(vbox, self.modif)

        pack(vbox, gtk.Label(""))

        butbox = gtk.HButtonBox()

        cancel_but = gtk.Button(stock=gtk.STOCK_CANCEL)

        cancel_but.connect('clicked', lambda widget: self.destroy())

        ok_but = gtk.Button(stock=gtk.STOCK_OK)

        ok_but.connect('clicked', self.ok)

        butbox.pack_start(cancel_but, 0, 0)

        butbox.pack_start(ok_but, 0, 0)

        butbox.show_all()

        pack(vbox, [butbox], end=True, bottom=True)

        vbox.show()

        self.add(vbox)

        # Now, set the parameters

        if param and param['elements'] == self.present:

            self.set_param(self.epsilon_adj, param["epsilon"], nelem)

            self.set_param(self.sigma_adj, param["sigma"], nelem)

            self.modif.set_active(param["modified"])

        self.show()

        self.grab_add()  # Lock all other windows

    def makematrix(self, present):

        nelem = len(present)

        adjdict = {}

        tbl = gtk.Table(2+nelem, 2+nelem)

        for i in range(nelem):

            s = chemical_symbols[present[i]]

            tbl.attach(gtk.Label(" " + str(present[i])), 0, 1, i, i+1)

            tbl.attach(gtk.Label("  "+s+" "), 1, 2, i, i+1)

            tbl.attach(gtk.Label(str(present[i])), i+2, i+3, 1+nelem, 2+nelem)

            tbl.attach(gtk.Label(s), i+2, i+3, nelem, 1+nelem)

            for j in range(i+1):

                adj = gtk.Adjustment(1.0, 0.0, 100.0, 0.1)

                spin = gtk.SpinButton(adj, 0.1, 3)

                tbl.attach(spin, 2+j, 3+j, i, i+1)

                adjdict[(i,j)] = adj

        tbl.show_all()

        return tbl, adjdict

    def set_param(self, adj, params, n):

        for i in range(n):

            for j in range(n):

                if j <= i:

                    adj[(i,j)].value = params[i,j]

    def get_param(self, adj, params, n):

        for i in range(n):

            for j in range(n):

                if j <= i:

                    params[i,j] = params[j,i] = adj[(i,j)].value

    def destroy(self):

        self.grab_remove()

        gtk.Window.destroy(self)

    def ok(self, *args):

        params = {}

        params["elements"] = copy(self.present)

        n = len(self.present)

        eps = np.zeros((n,n))

        self.get_param(self.epsilon_adj, eps, n)

        sigma = np.zeros((n,n))

        self.get_param(self.sigma_adj, sigma, n)

        params["epsilon"] = eps

        params["sigma"] = sigma

        params["modified"] = self.modif.get_active()

        setattr(self.owner, self.attrname, params)

        self.destroy()

class GPAW_Window(gtk.Window):

    gpaw_xc_list = ['LDA', 'PBE', 'RPBE', 'revPBE']

    gpaw_xc_default = 'PBE'

    def __init__(self, owner, param, attrname):

        gtk.Window.__init__(self)

        self.set_title("GPAW parameters")

        self.owner = owner

        self.attrname = attrname

        atoms = owner.atoms

        self.ucell = atoms.get_cell()

        self.size = tuple([self.ucell[i,i] for i in range(3)])

        self.pbc = atoms.get_pbc()

        self.orthogonal = self.isorthogonal(self.ucell)

        self.natoms = len(atoms)

        vbox = gtk.VBox()

        #label = gtk.Label("Specify the GPAW parameters here")

        #pack(vbox, [label])

        # Print some info

        txt = "%i atoms.\n" % (self.natoms,)

        if self.orthogonal:

            txt += "Orthogonal unit cell: %.2f x %.2f x %.2f Å." % self.size

        else:

            txt += "Non-orthogonal unit cell:\n"

            txt += str(self.ucell)

        pack(vbox, [gtk.Label(txt)])

        # XC potential

        self.xc = gtk.combo_box_new_text()

        for i, x in enumerate(self.gpaw_xc_list):

            self.xc.append_text(x)

            if x == self.gpaw_xc_default:

                self.xc.set_active(i)

        pack(vbox, [gtk.Label("Exchange-correlation functional: "),

                    self.xc])

        # Grid spacing

        self.radio_h = gtk.RadioButton(None, "Grid spacing")

        self.h = gtk.Adjustment(0.18, 0.0, 1.0, 0.01)

        self.h_spin = gtk.SpinButton(self.h, 0, 2)

        pack(vbox, [self.radio_h, gtk.Label(" h = "), self.h_spin,

                    gtk.Label("Å")])

        self.radio_gpts = gtk.RadioButton(self.radio_h, "Grid points")

        self.gpts = []

        self.gpts_spin = []

        for i in range(3):

            g = gtk.Adjustment(4, 4, 1000, 4)

            s = gtk.SpinButton(g, 0, 0)

            self.gpts.append(g)

            self.gpts_spin.append(s)

        self.gpts_hlabel = gtk.Label("")

        self.gpts_hlabel_format = "h<sub>eff</sub> = (%.3f, %.3f, %.3f) Å"

        pack(vbox, [self.radio_gpts, gtk.Label(" gpts = ("), self.gpts_spin[0],

                    gtk.Label(", "), self.gpts_spin[1], gtk.Label(", "),

                    self.gpts_spin[2], gtk.Label(")  "), self.gpts_hlabel])

        self.radio_h.connect("toggled", self.radio_grid_toggled)

        self.radio_gpts.connect("toggled", self.radio_grid_toggled)

        self.radio_grid_toggled(None)

        for g in self.gpts:

            g.connect("value-changed", self.gpts_changed)

        self.h.connect("value-changed", self.h_changed)

        # K-points

        self.kpts = []

        self.kpts_spin = []

        for i in range(3):

            if self.pbc[i] and self.orthogonal:

                default = np.ceil(20.0 / self.size[i])

            else:

                default = 1

            g = gtk.Adjustment(default, 1, 100, 1)

            s = gtk.SpinButton(g, 0, 0)

            self.kpts.append(g)

            self.kpts_spin.append(s)

            if not self.pbc[i]:

                s.set_sensitive(False)

            g.connect("value-changed", self.k_changed)

        pack(vbox, [gtk.Label("k-points  k = ("), self.kpts_spin[0],