1 #!/usr/bin/env python
2 # -*- coding: cp1252 -*-
3 """
4 eqtexsvg.py
5 functions for converting LaTeX equation string into SVG path
6 This extension need, to work properly:
7 - a TeX/LaTeX distribution (MiKTeX ...)
8 - pstoedit software: <http://www.pstoedit.net/pstoedit>
10 Copyright (C) 2006 Julien Vitard <julienvitard@gmail.com>
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
26 """
28 import inkex, os, tempfile, sys, xml.dom.minidom
30 def create_equation_tex(filename, equation):
31 tex = open(filename, 'w')
32 tex.write("""%% processed with eqtexsvg.py
33 \\documentclass{article}
34 \\usepackage{amsmath}
35 \\usepackage{amssymb}
36 \\usepackage{amsfonts}
38 \\thispagestyle{empty}
39 \\begin{document}
40 """)
41 tex.write(equation)
42 tex.write("\n\\end{document}\n")
43 tex.close()
45 def svg_open(self,filename):
46 doc_width = inkex.unittouu(self.document.getroot().get('width'))
47 doc_height = inkex.unittouu(self.document.getroot().get('height'))
48 doc_sizeH = min(doc_width,doc_height)
49 doc_sizeW = max(doc_width,doc_height)
51 def clone_and_rewrite(self, node_in):
52 in_tag = node_in.tag.rsplit('}',1)[-1]
53 if in_tag != 'svg':
54 node_out = inkex.etree.Element(inkex.addNS(in_tag,'svg'))
55 for name in node_in.attrib:
56 node_out.set(name, node_in.attrib[name])
57 else:
58 node_out = inkex.etree.Element(inkex.addNS('g','svg'))
59 for c in node_in.iterchildren():
60 c_tag = c.tag.rsplit('}',1)[-1]
61 if c_tag in ('g', 'path', 'polyline', 'polygon'):
62 child = clone_and_rewrite(self, c)
63 if c_tag == 'g':
64 child.set('transform','matrix('+str(doc_sizeH/700.)+',0,0,'+str(-doc_sizeH/700.)+','+str(-doc_sizeH*0.25)+','+str(doc_sizeW*0.75)+')')
65 node_out.append(child)
67 return node_out
69 doc = inkex.etree.parse(filename)
70 svg = doc.getroot()
71 group = clone_and_rewrite(self, svg)
72 self.current_layer.append(group)
74 class EQTEXSVG(inkex.Effect):
75 def __init__(self):
76 inkex.Effect.__init__(self)
77 self.OptionParser.add_option("-f", "--formule",
78 action="store", type="string",
79 dest="formula", default=10.0,
80 help="LaTeX formula")
81 def effect(self):
83 base_dir = tempfile.mkdtemp("", "inkscape-");
84 latex_file = os.path.join(base_dir, "eq.tex")
85 aux_file = os.path.join(base_dir, "eq.aux")
86 log_file = os.path.join(base_dir, "eq.log")
87 ps_file = os.path.join(base_dir, "eq.ps")
88 dvi_file = os.path.join(base_dir, "eq.dvi")
89 svg_file = os.path.join(base_dir, "eq.svg")
90 out_file = os.path.join(base_dir, "eq.out")
91 err_file = os.path.join(base_dir, "eq.err")
93 def clean():
94 os.remove(latex_file)
95 os.remove(aux_file)
96 os.remove(log_file)
97 os.remove(ps_file)
98 os.remove(dvi_file)
99 os.remove(svg_file)
100 os.remove(out_file)
101 if os.path.exists(err_file):
102 os.remove(err_file)
103 os.rmdir(base_dir)
105 create_equation_tex(latex_file, self.options.formula)
106 os.system('latex "-output-directory=%s" -halt-on-error "%s" > "%s"' \
107 % (base_dir, latex_file, out_file))
108 try:
109 os.stat(dvi_file)
110 except OSError:
111 print >>sys.stderr, "invalid LaTeX input:"
112 print >>sys.stderr, self.options.formula
113 print >>sys.stderr, "temporary files were left in:", base_dir
114 sys.exit(1)
116 os.system('dvips -q -f -E -D 600 -y 5000 -o "%s" "%s"' % (ps_file, dvi_file))
117 # cd to base_dir is necessary, because pstoedit writes
118 # temporary files to cwd and needs write permissions
119 separator = ';'
120 if os.name == 'nt':
121 separator = '&&'
122 os.system('cd "%s" %s pstoedit -f plot-svg -dt -ssp "%s" "%s" > "%s" 2> "%s"' \
123 % (base_dir, separator, ps_file, svg_file, out_file, err_file))
125 # forward errors to stderr but skip pstoedit header
126 if os.path.exists(err_file):
127 err_stream = open(err_file, 'r')
128 for line in err_stream:
129 if not line.startswith('pstoedit: version'):
130 sys.stderr.write(line + '\n')
131 err_stream.close()
133 svg_open(self, svg_file)
135 clean()
137 if __name__ == '__main__':
138 e = EQTEXSVG()
139 e.affect()
142 # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99