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#!/usr/bin/env python
# -*- coding: cp1252 -*-
"""
eqtexsvg.py
functions for converting LaTeX equation string into SVG path
This extension need, to work properly:
- a TeX/LaTeX distribution (MiKTeX ...)
- pstoedit software: <http://www.pstoedit.net/pstoedit>
Copyright (C) 2006 Julien Vitard <julienvitard@gmail.com>
2010-04-04: Added support for custom packages
Christoph Schmidt-Hieber <christsc@gmx.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
import inkex, os, tempfile, sys, xml.dom.minidom
def parse_pkgs(pkgstring):
pkglist = pkgstring.replace(" ","").split(",")
header = ""
for pkg in pkglist:
header += "\\usepackage{%s}\n" % pkg
return header
def create_equation_tex(filename, equation, add_header=""):
tex = open(filename, 'w')
tex.write("""%% processed with eqtexsvg.py
\\documentclass{article}
\\usepackage{amsmath}
\\usepackage{amssymb}
\\usepackage{amsfonts}
""")
tex.write(add_header)
tex.write("""\\thispagestyle{empty}
\\begin{document}
""")
tex.write(equation)
tex.write("\n\\end{document}\n")
tex.close()
def svg_open(self,filename):
doc_width = self.unittouu(self.document.getroot().get('width'))
doc_height = self.unittouu(self.document.getroot().get('height'))
doc_sizeH = min(doc_width,doc_height)
doc_sizeW = max(doc_width,doc_height)
def clone_and_rewrite(self, node_in):
in_tag = node_in.tag.rsplit('}',1)[-1]
if in_tag != 'svg':
node_out = inkex.etree.Element(inkex.addNS(in_tag,'svg'))
for name in node_in.attrib:
node_out.set(name, node_in.attrib[name])
else:
node_out = inkex.etree.Element(inkex.addNS('g','svg'))
for c in node_in.iterchildren():
c_tag = c.tag.rsplit('}',1)[-1]
if c_tag in ('g', 'path', 'polyline', 'polygon'):
child = clone_and_rewrite(self, c)
if c_tag == 'g':
child.set('transform','matrix('+str(doc_sizeH/700.)+',0,0,'+str(-doc_sizeH/700.)+','+str(-doc_sizeH*0.25)+','+str(doc_sizeW*0.75)+')')
node_out.append(child)
return node_out
doc = inkex.etree.parse(filename)
svg = doc.getroot()
group = clone_and_rewrite(self, svg)
self.current_layer.append(group)
class EQTEXSVG(inkex.Effect):
def __init__(self):
inkex.Effect.__init__(self)
self.OptionParser.add_option("-f", "--formule",
action="store", type="string",
dest="formula", default="",
help="LaTeX formula")
self.OptionParser.add_option("-p", "--packages",
action="store", type="string",
dest="packages", default="",
help="Additional packages")
def effect(self):
base_dir = tempfile.mkdtemp("", "inkscape-");
latex_file = os.path.join(base_dir, "eq.tex")
aux_file = os.path.join(base_dir, "eq.aux")
log_file = os.path.join(base_dir, "eq.log")
ps_file = os.path.join(base_dir, "eq.ps")
dvi_file = os.path.join(base_dir, "eq.dvi")
svg_file = os.path.join(base_dir, "eq.svg")
out_file = os.path.join(base_dir, "eq.out")
err_file = os.path.join(base_dir, "eq.err")
def clean():
os.remove(latex_file)
os.remove(aux_file)
os.remove(log_file)
os.remove(ps_file)
os.remove(dvi_file)
os.remove(svg_file)
os.remove(out_file)
if os.path.exists(err_file):
os.remove(err_file)
os.rmdir(base_dir)
if self.options.formula == "":
print >>sys.stderr, "empty LaTeX input. Nothing to be done"
return
add_header = parse_pkgs(self.options.packages)
create_equation_tex(latex_file, self.options.formula, add_header)
os.system('latex "-output-directory=%s" -halt-on-error "%s" > "%s"' \
% (base_dir, latex_file, out_file))
try:
os.stat(dvi_file)
except OSError:
print >>sys.stderr, "invalid LaTeX input:"
print >>sys.stderr, self.options.formula
print >>sys.stderr, "temporary files were left in:", base_dir
sys.exit(1)
os.system('dvips -q -f -E -D 600 -y 5000 -o "%s" "%s"' % (ps_file, dvi_file))
# cd to base_dir is necessary, because pstoedit writes
# temporary files to cwd and needs write permissions
separator = ';'
if os.name == 'nt':
separator = '&&'
os.system('cd "%s" %s pstoedit -f plot-svg -dt -ssp "%s" "%s" > "%s" 2> "%s"' \
% (base_dir, separator, ps_file, svg_file, out_file, err_file))
# forward errors to stderr but skip pstoedit header
if os.path.exists(err_file):
err_stream = open(err_file, 'r')
for line in err_stream:
if not line.startswith('pstoedit: version'):
sys.stderr.write(line + '\n')
err_stream.close()
svg_open(self, svg_file)
clean()
if __name__ == '__main__':
e = EQTEXSVG()
e.affect()
# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99
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