#!/usr/pkg/bin/python
import sys, os, Tkinter
from Tkconstants import *
try:
 datafile = sys.argv[1]
except:
 datafile = graphdata.txt
try:
 data = open(datafile, 'r')
except:
 raise
datapoints = []
while len(data.readline().split()) > 1:
 try:
  datapoints.append(map(float, _))
 except:
  # header line, ignore it
  pass
try:
 tk = Tkinter.Tk()
 canvas = Tkinter.Canvas(tk)
 canvas.create_line((0, 0, 100, 100))
 canvas.pack()
 tk.mainloop()
except:
 sys.stderr.write('Cannot show graph, here is point data:\n')
 print repr(datapoints)