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lammps/python/examples/vizplotgui_vmd.py
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vizplotgui_vmd.py
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#!/usr/bin/env python -i
# preceeding line should have path for Python on your machine
# vizplotgui_vmd.py
# Purpose: viz running LAMMPS simulation via VMD with plot and GUI
# Syntax: vizplotgui_vmd.py in.lammps Nfreq compute-ID
# in.lammps = LAMMPS input script
# Nfreq = plot data point and viz shapshot every this many steps
# compute-ID = ID of compute that calculates temperature
# (or any other scalar quantity)
# IMPORTANT: this script cannot yet be run in parallel via Pypar,
# because I can't seem to do a MPI-style broadcast in Pypar
from __future__ import print_function
import sys,time
sys.path.append("./pizza")
# methods called by GUI
def run():
global runflag
runflag = 1
def stop():
global runflag
runflag = 0
def settemp(value):
global temptarget
temptarget = slider.get()
def quit():
global breakflag
breakflag = 1
# method called by timestep loop every Nfreq steps
# read dump snapshot and viz it, update plot with compute value
def update(ntimestep):
d.next()
d.unscale()
p.single(ntimestep)
v.append('tmp.pdb','pdb')
value = lmp.extract_compute(compute,0,0)
xaxis.append(ntimestep)
yaxis.append(value)
gn.plot(xaxis,yaxis)
# parse command line
argv = sys.argv
if len(argv) != 4:
print("Syntax: vizplotgui_vmd.py in.lammps Nfreq compute-ID")
sys.exit()
infile = sys.argv[1]
nfreq = int(sys.argv[2])
compute = sys.argv[3]
me = 0
# uncomment if running in parallel via Pypar
#import pypar
#me = pypar.rank()
#nprocs = pypar.size()
from lammps import lammps
lmp = lammps()
# run infile all at once
# assumed to have no run command in it
# dump a file in native LAMMPS dump format for Pizza.py dump tool
lmp.file(infile)
lmp.command("thermo %d" % nfreq)
lmp.command("dump python all atom %d tmp.dump" % nfreq)
# initial 0-step run to generate initial 1-point plot, dump file, and image
lmp.command("run 0 pre yes post no")
value = lmp.extract_compute(compute,0,0)
ntimestep = 0
xaxis = [ntimestep]
yaxis = [value]
breakflag = 0
runflag = 0
temptarget = 1.0
# wrapper on VMD window via Pizza.py vmd tool
# just proc 0 handles reading of dump file and viz
if me == 0:
from vmd import vmd
v = vmd()
v('menu main off')
v.rep('VDW')
from dump import dump
from pdbfile import pdbfile
d = dump('tmp.dump',0)
p = pdbfile(d)
d.next()
d.unscale()
p.single(ntimestep)
v.new('tmp.pdb','pdb')
# display GUI with run/stop buttons and slider for temperature
if me == 0:
try:
from Tkinter import *
except:
from tkinter import *
tkroot = Tk()
tkroot.withdraw()
root = Toplevel(tkroot)
root.title("LAMMPS GUI")
frame = Frame(root)
Button(frame,text="Run",command=run).pack(side=LEFT)
Button(frame,text="Stop",command=stop).pack(side=LEFT)
slider = Scale(frame,from_=0.0,to=5.0,resolution=0.1,
orient=HORIZONTAL,label="Temperature")
slider.bind('<ButtonRelease-1>',settemp)
slider.set(temptarget)
slider.pack(side=LEFT)
Button(frame,text="Quit",command=quit).pack(side=RIGHT)
frame.pack()
tkroot.update()
# wrapper on GnuPlot via Pizza.py gnu tool
if me == 0:
from gnu import gnu
gn = gnu()
gn.plot(xaxis,yaxis)
gn.title(compute,"Timestep","Temperature")
# endless loop, checking status of GUI settings every Nfreq steps
# run with pre yes/no and post yes/no depending on go/stop status
# re-invoke fix langevin with new seed when temperature slider changes
# after re-invoke of fix langevin, run with pre yes
running = 0
temp = temptarget
seed = 12345
lmp.command("fix 2 all langevin %g %g 0.1 %d" % (temp,temp,seed))
while 1:
if me == 0: tkroot.update()
if temp != temptarget:
temp = temptarget
seed += me+1
lmp.command("fix 2 all langevin %g %g 0.1 12345" % (temp,temp))
running = 0
if runflag and running:
lmp.command("run %d pre no post no" % nfreq)
ntimestep += nfreq
if me == 0: update(ntimestep)
elif runflag and not running:
lmp.command("run %d pre yes post no" % nfreq)
ntimestep += nfreq
if me == 0: update(ntimestep)
elif not runflag and running:
lmp.command("run %d pre no post yes" % nfreq)
ntimestep += nfreq
if me == 0: update(ntimestep)
if breakflag: break
if runflag: running = 1
else: running = 0
time.sleep(0.01)
lmp.command("run 0 pre no post yes")
# uncomment if running in parallel via Pypar
#print("Proc %d out of %d procs has" % (me,nprocs), lmp)
#pypar.finalize()
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