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/usr/lib/python2.7/dist-packages/FIAT/asci2vtk2d.py is in python-fiat 1.6.0-1.

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# Copyright (C) 2008-2012 Robert C. Kirby (Texas Tech University)
#
# This file is part of FIAT.
#
# FIAT is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# FIAT is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with FIAT. If not, see <http://www.gnu.org/licenses/>.

#!/usr/bin/env python

# 2d mode: x y z, z = f(x,y)
import sys

if len(sys.argv) > 1:
    filename = sys.argv[1]
    print(filename)
    base = filename.split(".")[0]
    output = "%s.vtk" % (base,)
    print("output to %s" % output)
else:
    print("python asci2vtk.py foo")
    sys.exit(0)


fin = open( filename, "r" )

coords = [ ]

for line in fin:
    coords.append( line.split() )

fin.close()

n = len( coords )

print("%s points" % (str(n),))


fout = open( output, "w" )
fout.write("""# vtk DataFile Version 2.0
points
ASCII
DATASET UNSTRUCTURED_GRID
POINTS %s float\n""" % str(n))

for c in coords:
    fout.write("%s %s %s\n" % (c[0], c[1], 0))

fout.write("CELLS %s %s\n" % (n, 2*n))
for i in range( n ):
    fout.write("1 %s\n" % i)

fout.write("CELL_TYPES %s\n" % (n,))
for i in range( n ):
    fout.write("1\n")

fout.write("POINT_DATA %s\n" % (n,))
fout.write("""SCALARS Z float 1
LOOKUP_TABLE default\n""")

for i in range( n ):
    fout.write("%s" % coords[i][2])

fout.close()