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# $Id: gp_win32.py 292 2006-03-03 09:49:04Z mhagger $
# Copyright (C) 1999-2003 Michael Haggerty <mhagger@alum.mit.edu>
#
# This file is licensed under the GNU Lesser General Public License
# (LGPL). See LICENSE.txt for details.
"""gp_win32 -- an interface to gnuplot for Windows.
"""
import Errors
# ############ Configuration variables: ################################
class GnuplotOpts:
"""The configuration options for gnuplot under windows.
See gp_unix.py for details about the meaning of these options.
Please let me know if you know better choices for these settings.
"""
# Command to start up the gnuplot program. Note that on windows
# the main gnuplot program cannot be used directly because it can
# not read commands from standard input. See README for more
# information.
#
# If pgnuplot is in a subdirectory with spaces in its name, extra
# quoting is required for windows for it to launch gnuplot.
# Moreover, it is suggested to use a raw string to avoid having to
# quote backslashes in the filename. Example:
#
# gnuplot_command = r'"C:\Program Files\gp371w32\pgnuplot.exe"'
gnuplot_command = r'pgnuplot.exe'
# The '-persist' option is not supported on windows:
recognizes_persist = 0
# As far as I know, gnuplot under windows can use binary data:
recognizes_binary_splot = 1
# Apparently gnuplot on windows can use inline data, but we use
# non-inline data (i.e., temporary files) by default for no
# special reason:
prefer_inline_data = 0
# os.mkfifo is apparently not supported under Windows.
support_fifo = 0
prefer_fifo_data = 0
# The default choice for the 'set term' command (to display on
# screen):
default_term = 'windows'
# According to the gnuplot help manual, the following can be used
# to print directly to a printer under windows. (Of course it
# won't help if your printer can't handle postscript!)
default_lpr = 'PRN'
# Used the 'enhanced' option of postscript by default? Set to
# None (*not* 0!) if your version of gnuplot doesn't support
# enhanced postscript.
prefer_enhanced_postscript = 1
# ############ End of configuration options ############################
try:
from sys import hexversion
except ImportError:
hexversion = 0
if hexversion >= 0x02000000:
# Apparently at least as of Python 2.0b1, popen support for
# windows is adequate. Give that a try:
from os import popen
else:
# For earlier versions, you have to have the win32 extensions
# installed and we use the popen that it provides.
from win32pipe import popen
# Mac doesn't recognize persist.
def test_persist():
return 0
class GnuplotProcess:
"""Unsophisticated interface to a running gnuplot program.
See gp_unix.py for usage information.
"""
def __init__(self, persist=0):
"""Start a gnuplot process.
Create a 'GnuplotProcess' object. This starts a gnuplot
program and prepares to write commands to it.
Keyword arguments:
'persist' -- the '-persist' option is not supported under
Windows so this argument must be zero.
"""
if persist:
raise Errors.OptionError(
'-persist is not supported under Windows!')
self.gnuplot = popen(GnuplotOpts.gnuplot_command, 'w')
# forward write and flush methods:
self.write = self.gnuplot.write
self.flush = self.gnuplot.flush
def close(self):
if self.gnuplot is not None:
self.gnuplot.close()
self.gnuplot = None
def __del__(self):
self.close()
def __call__(self, s):
"""Send a command string to gnuplot, followed by newline."""
self.write(s + '\n')
self.flush()
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