diff --git a/writetex.py b/writetex.py
index c7fd504..af35697 100644
--- a/writetex.py
+++ b/writetex.py
@@ -1,347 +1,356 @@
-#!/usr/bin/env python
-# -*- coding:utf-8
-"""
-writetex.py
-An Latex equation editor for Inkscape.
-
-:Author: WANG Longqi <iqgnol@gmail.com>
-:Date: 2017-11-04
-:Version: v1.6.2
-
-This file is a part of WriteTeX extension for Inkscape. For more information,
-please refer to http://wanglongqi.github.io/WriteTeX.
-"""
-from __future__ import print_function
-import inkex
-import os
-import tempfile
-import sys
-import copy
-import subprocess
-import re
-# from distutils import spawn
-WriteTexNS = u'http://wanglongqi.github.io/WriteTeX'
-# from textext
-SVG_NS = u"http://www.w3.org/2000/svg"
-XLINK_NS = u"http://www.w3.org/1999/xlink"
-
-
-class WriteTex(inkex.Effect):
-
-    def __init__(self):
-        inkex.Effect.__init__(self)
-        self.OptionParser.add_option("-f", "--formula",
-                                     action="store", type="string",
-                                     dest="formula", default="",
-                                     help="LaTeX formula")
-        self.OptionParser.add_option("-p", "--preamble",
-                                     action="store", type="string",
-                                     dest="preamble", default="",
-                                     help="Preamble File")
-        self.OptionParser.add_option("--read-as-line",
-                                     action="store", type="string",
-                                     dest="preline", default="",
-                                     help="Read preamble as string")
-        self.OptionParser.add_option("-s", "--scale",
-                                     action="store", type="string",
-                                     dest="scale", default="",
-                                     help="Scale Factor")
-        self.OptionParser.add_option("-i", "--inputfile",
-                                     action="store", type="string",
-                                     dest="inputfile", default="",
-                                     help="Read From File")
-        self.OptionParser.add_option("-c", "--pdftosvg",
-                                     action="store", type="string",
-                                     dest="pdftosvg", default="",
-                                     help="PDFtoSVG Converter")
-        self.OptionParser.add_option("--action", action="store",
-                                     type="string", dest="action",
-                                     default=None, help="")
-        self.OptionParser.add_option("-r", "--rescale",
-                                     action="store", type="string",
-                                     dest="rescale", default="",
-                                     help="Rescale the object")
-        self.OptionParser.add_option("-l", "--latexcmd",
-                                     action="store", type="string",
-                                     dest="latexcmd", default="xelatex",
-                                     help="Latex command used to compile")
-        self.OptionParser.add_option("-t", "--tosvg",
-                                     action="store", type="string",
-                                     dest="tosvg", default="false",
-                                     help="Write output directly to a new node in svg file")
-
-    def effect(self):
-        self.options.scale = float(self.options.scale)
-        action = self.options.action.strip("\"")
-        if action == "viewold":
-            for i in self.options.ids:
-                node = self.selected[i]
-                if node.tag != '{%s}g' % SVG_NS:
-                    continue
-                if '{%s}text' % WriteTexNS in node.attrib:
-                    if self.options.tosvg == "true":
-                        doc = inkex.etree.fromstring(
-                            '<text x="%g" y="%g">%s</text>' % (
-                                self.view_center[0],
-                                self.view_center[1],
-                                node.attrib.get(
-                                    '{%s}text' % WriteTexNS, '').decode('string-escape')))
-                        p = node.getparent()
-                        # p.remove(node)
-                        p.append(doc)
-                    else:
-                        print(node.attrib.get(
-                            '{%s}text' % WriteTexNS, '').decode('string-escape'), file=sys.stderr)
-                    return
-            print("No text find.", file=sys.stderr)
-            return
-        else:
-            if action == "new":
-                self.text = self.options.formula
-            else:
-                f = open(self.options.inputfile)
-                self.text = f.read()
-                f.close()
-
-            if self.text == "":
-                print("empty LaTeX input. Nothing is changed.", file=sys.stderr)
-                return
-
-            tmp_dir = tempfile.mkdtemp("", "writetex-")
-            tex_file = os.path.join(tmp_dir, "writetex.tex")
-            svg_file = os.path.join(tmp_dir, "writetex.svg")
-            pdf_file = os.path.join(tmp_dir, "writetex.pdf")
-            log_file = os.path.join(tmp_dir, "writetex.log")
-            out_file = os.path.join(tmp_dir, "writetex.out")
-            err_file = os.path.join(tmp_dir, "writetex.err")
-            aux_file = os.path.join(tmp_dir, "writetex.aux")
-
-            if self.options.preline == "true":
-                preamble = self.options.preamble
-            else:
-                if self.options.preamble == "":
-                    preamble = ""
-                else:
-                    f = open(self.options.preamble)
-                    preamble = f.read()
-                    f.close()
-
-            self.tex = r"""
-            \documentclass[landscape,a3paper]{article}
-            \usepackage{geometry}
-            %s
-            \pagestyle{empty}
-            \begin{document}
-            \noindent
-            %s
-            \end{document}
-            """ % (preamble, self.text)
-
-            tex = open(tex_file, 'w')
-            tex.write(self.tex)
-            tex.close()
-
-            if self.options.latexcmd.lower() == "xelatex":
-                subprocess.call('xelatex "-output-directory=%s" -interaction=nonstopmode -halt-on-error "%s" > "%s"'
-                                % (tmp_dir, tex_file, out_file), shell=True)
-            elif self.options.latexcmd.lower() == "pdflatex":
-                subprocess.call('pdflatex "-output-directory=%s" -interaction=nonstopmode -halt-on-error "%s" > "%s"'
-                                % (tmp_dir, tex_file, out_file), shell=True)
-            else:
-                # Setting `latexcmd` to following string produces the same result as xelatex condition:
-                # 'xelatex "-output-directory={tmp_dir}" -interaction=nonstopmode -halt-on-error "{tex_file}" > "{out_file}"'
-                subprocess.call(self.options.latexcmd.format(
-                    tmp_dir=tmp_dir, tex_file=tex_file, out_file=out_file), shell=True)
-
-            if not os.path.exists(pdf_file):
-                print("Latex error: check your latex file and preamble.",file=sys.stderr)
-                print(open(log_file).read(),file=sys.stderr)
-                return
-            else:
-                if self.options.pdftosvg == '1':
-                    subprocess.call('pdf2svg %s %s' %
-                                    (pdf_file, svg_file), shell=True)
-                    self.merge_pdf2svg_svg(svg_file)
-                else:
-                    subprocess.call('pstoedit -f plot-svg "%s" "%s"  -dt -ssp -psarg -r9600x9600 > "%s" 2> "%s"'
-                                    % (pdf_file, svg_file, out_file, err_file), shell=True)
-                    self.merge_pstoedit_svg(svg_file)
-
-            os.remove(tex_file)
-            os.remove(log_file)
-            os.remove(out_file)
-            if os.path.exists(err_file):
-                os.remove(err_file)
-            if os.path.exists(aux_file):
-                os.remove(aux_file)
-            if os.path.exists(svg_file):
-                os.remove(svg_file)
-            if os.path.exists(pdf_file):
-                os.remove(pdf_file)
-            os.rmdir(tmp_dir)
-
-    def merge_pstoedit_svg(self, svg_file):
-        def svg_to_group(self, svgin):
-            innode = svgin.tag.rsplit('}', 1)[-1]
-            # replace svg with group by select specific elements
-            if innode == 'svg':
-                svgout = inkex.etree.Element(inkex.addNS('g', 'WriteTexNS'))
-            else:
-                svgout = inkex.etree.Element(inkex.addNS(innode, 'WriteTexNS'))
-                for att in svgin.attrib:
-                    svgout.attrib[att] = svgin.attrib[att]
-
-            for child in svgin.iterchildren():
-                tag = child.tag.rsplit('}', 1)[-1]
-                if tag in ['g', 'path', 'line']:
-                    child = svg_to_group(self, child)
-                    svgout.append(child)
-
-            # TODO: add crop range code here.
-
-            return svgout
-
-        doc = inkex.etree.parse(svg_file)
-        svg = doc.getroot()
-        newnode = svg_to_group(self, svg)
-        newnode.attrib['{%s}text' %
-                       WriteTexNS] = self.text.encode('string-escape')
-
-        replace = False
-
-        for i in self.options.ids:
-            node = self.selected[i]
-            if node.tag != '{%s}g' % SVG_NS:
-                continue
-            if '{%s}text' % WriteTexNS in node.attrib:
-                replace = True
-                break
-
-        if replace:
-            try:
-                if self.options.rescale == 'true':
-                    newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
-                        800*self.options.scale, 800*self.options.scale,
-                        self.view_center[0],
-                        self.view_center[1])
-                else:
-                    if 'transform' in node.attrib:
-                        newnode.attrib['transform'] = node.attrib['transform']
-                    else:
-                        newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
-                            800*self.options.scale, 800*self.options.scale,
-                            self.view_center[0],
-                            self.view_center[1])
-                newnode.attrib['style'] = node.attrib['style']
-            except:
-                pass
-            p = node.getparent()
-            p.remove(node)
-            p.append(newnode)
-        else:
-            newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
-                800*self.options.scale, 800*self.options.scale,
-                self.view_center[0],
-                self.view_center[1])
-            self.current_layer.append(newnode)
-
-    def merge_pdf2svg_svg(self, svg_file):
-        # This is the smallest point coordinates assumed
-        MAX_XY = [-10000000, -10000000]
-
-        def svg_to_group(self, svgin):
-            target = {}
-            for node in svgin.xpath('//*[@id]'):
-                target['#'+node.attrib['id']] = node
-
-            for node in svgin.xpath('//*'):
-                if ('{%s}href' % XLINK_NS) in node.attrib:
-                    href = node.attrib['{%s}href' % XLINK_NS]
-                    p = node.getparent()
-                    p.remove(node)
-                    trans = 'translate(%s,%s)' % (
-                        node.attrib['x'], node.attrib['y'])
-                    for i in target[href].iterchildren():
-                        i.attrib['transform'] = trans
-                        x, y = self.parse_transform(trans)
-                        if x > MAX_XY[0]:
-                            MAX_XY[0] = x
-                        if y > MAX_XY[1]:
-                            MAX_XY[1] = y
-                        p.append(copy.copy(i))
-
-            svgout = inkex.etree.Element(inkex.addNS('g', 'WriteTexNS'))
-            for node in svgin:
-                if node is svgout:
-                    continue
-                if node.tag == '{%s}defs' % SVG_NS:
-                    continue
-                svgout.append(node)
-            return svgout
-
-        doc = inkex.etree.parse(svg_file)
-        svg = doc.getroot()
-        newnode = svg_to_group(self, svg)
-        newnode.attrib['{%s}text' %
-                       WriteTexNS] = self.text.encode('string-escape')
-
-        replace = False
-
-        for i in self.options.ids:
-            node = self.selected[i]
-            if node.tag != '{%s}g' % SVG_NS:
-                continue
-            if '{%s}text' % WriteTexNS in node.attrib:
-                replace = True
-                break
-
-        if replace:
-            try:
-                if self.options.rescale == 'true':
-                    newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
-                        self.options.scale, self.options.scale,
-                        self.view_center[0],
-                        self.view_center[1])
-                else:
-                    if 'transform' in node.attrib:
-                        newnode.attrib['transform'] = node.attrib['transform']
-                    else:
-                        newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
-                            self.options.scale, self.options.scale,
-                            self.view_center[0]-MAX_XY[0]*self.options.scale,
-                            self.view_center[1]-MAX_XY[1]*self.options.scale)
-                newnode.attrib['style'] = node.attrib['style']
-            except:
-                pass
-            p = node.getparent()
-            p.remove(node)
-            p.append(newnode)
-        else:
-            self.current_layer.append(newnode)
-            newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
-                self.options.scale, self.options.scale,
-                self.view_center[0]-MAX_XY[0]*self.options.scale,
-                self.view_center[1]-MAX_XY[1]*self.options.scale)
-
-    @staticmethod
-    def parse_transform(transf):
-        if transf == "" or transf is None:
-            return(0, 0)
-        stransf = transf.strip()
-        result = re.match(
-            "(translate|scale|rotate|skewX|skewY|matrix)\s*\(([^)]*)\)\s*,?",
-            stransf)
-        if result.group(1) == "translate":
-            args = result.group(2).replace(',', ' ').split()
-            dx = float(args[0])
-            if len(args) == 1:
-                dy = 0.0
-            else:
-                dy = float(args[1])
-            return (dx, dy)
-        else:
-            return (0, 0)
-
-if __name__ == '__main__':
-    e = WriteTex()
-    e.affect()
+#!/usr/bin/env python
+# -*- coding:utf-8
+"""
+writetex.py
+An Latex equation editor for Inkscape.
+
+:Author: WANG Longqi <iqgnol@gmail.com>
+:Date: 2018-11-24
+:Version: v1.7.0
+
+This file is a part of WriteTeX extension for Inkscape. For more information,
+please refer to http://wanglongqi.github.io/WriteTeX.
+"""
+from __future__ import print_function
+import inkex
+import os
+import tempfile
+import sys
+import copy
+import subprocess
+import re
+# from distutils import spawn
+WriteTexNS = u'http://wanglongqi.github.io/WriteTeX'
+# from textext
+SVG_NS = u"http://www.w3.org/2000/svg"
+XLINK_NS = u"http://www.w3.org/1999/xlink"
+
+
+class WriteTex(inkex.Effect):
+
+    def __init__(self):
+        inkex.Effect.__init__(self)
+        self.OptionParser.add_option("-f", "--formula",
+                                     action="store", type="string",
+                                     dest="formula", default="",
+                                     help="LaTeX formula")
+        self.OptionParser.add_option("-p", "--preamble",
+                                     action="store", type="string",
+                                     dest="preamble", default="",
+                                     help="Preamble File")
+        self.OptionParser.add_option("--read-as-line",
+                                     action="store", type="string",
+                                     dest="preline", default="",
+                                     help="Read preamble as string")
+        self.OptionParser.add_option("-s", "--scale",
+                                     action="store", type="string",
+                                     dest="scale", default="",
+                                     help="Scale Factor")
+        self.OptionParser.add_option("-i", "--inputfile",
+                                     action="store", type="string",
+                                     dest="inputfile", default="",
+                                     help="Read From File")
+        self.OptionParser.add_option("-c", "--pdftosvg",
+                                     action="store", type="string",
+                                     dest="pdftosvg", default="",
+                                     help="PDFtoSVG Converter")
+        self.OptionParser.add_option("--action", action="store",
+                                     type="string", dest="action",
+                                     default=None, help="")
+        self.OptionParser.add_option("-r", "--rescale",
+                                     action="store", type="string",
+                                     dest="rescale", default="",
+                                     help="Rescale the object")
+        self.OptionParser.add_option("-l", "--latexcmd",
+                                     action="store", type="string",
+                                     dest="latexcmd", default="xelatex",
+                                     help="Latex command used to compile")
+        self.OptionParser.add_option("-t", "--tosvg",
+                                     action="store", type="string",
+                                     dest="tosvg", default="false",
+                                     help="Write output directly to a new node in svg file")
+
+    def effect(self):
+        self.options.scale = float(self.options.scale)
+        action = self.options.action.strip("\"")
+        if action == "viewold":
+            for i in self.options.ids:
+                node = self.selected[i]
+                if node.tag != '{%s}g' % SVG_NS:
+                    continue
+                if '{%s}text' % WriteTexNS in node.attrib:
+                    if self.options.tosvg == "true":
+                        doc = inkex.etree.fromstring(
+                            '<text x="%g" y="%g">%s</text>' % (
+                                self.view_center[0],
+                                self.view_center[1],
+                                node.attrib.get(
+                                    '{%s}text' % WriteTexNS, '').decode('string-escape')))
+                        p = node.getparent()
+                        # p.remove(node)
+                        p.append(doc)
+                    else:
+                        print(node.attrib.get(
+                            '{%s}text' % WriteTexNS, '').decode('string-escape'), file=sys.stderr)
+                    return
+            print("No text find.", file=sys.stderr)
+            return
+        else:
+            if action == "new":
+                self.text = self.options.formula
+            else:
+                f = open(self.options.inputfile)
+                self.text = f.read()
+                f.close()
+
+            if self.text == "":
+                print("empty LaTeX input. Nothing is changed.", file=sys.stderr)
+                return
+
+            tmp_dir = tempfile.mkdtemp("", "writetex-")
+            tex_file = os.path.join(tmp_dir, "writetex.tex")
+            svg_file = os.path.join(tmp_dir, "writetex.svg")
+            pdf_file = os.path.join(tmp_dir, "writetex.pdf")
+            log_file = os.path.join(tmp_dir, "writetex.log")
+            out_file = os.path.join(tmp_dir, "writetex.out")
+            err_file = os.path.join(tmp_dir, "writetex.err")
+            aux_file = os.path.join(tmp_dir, "writetex.aux")
+
+            if self.options.preline == "true":
+                preamble = self.options.preamble
+            else:
+                if self.options.preamble == "":
+                    preamble = ""
+                else:
+                    f = open(self.options.preamble)
+                    preamble = f.read()
+                    f.close()
+
+            self.tex = r"""
+            \documentclass[landscape,a3paper]{article}
+            \usepackage{geometry}
+            %s
+            \pagestyle{empty}
+            \begin{document}
+            \noindent
+            %s
+            \end{document}
+            """ % (preamble, self.text)
+
+            tex = open(tex_file, 'w')
+            tex.write(self.tex)
+            tex.close()
+
+            if self.options.latexcmd.lower() == "xelatex":
+                cmd = " CMD executed: {}".format('xelatex "-output-directory=%s" -interaction=nonstopmode -halt-on-error "%s" > "%s"'
+                                                 % (tmp_dir, tex_file, out_file))
+                subprocess.call('xelatex "-output-directory=%s" -interaction=nonstopmode -halt-on-error "%s" > "%s"'
+                                % (tmp_dir, tex_file, out_file), shell=True)
+            elif self.options.latexcmd.lower() == "pdflatex":
+                cmd = " CMD executed: {}".format('pdflatex "-output-directory=%s" -interaction=nonstopmode -halt-on-error "%s" > "%s"'
+                                                 % (tmp_dir, tex_file, out_file))
+                subprocess.call('pdflatex "-output-directory=%s" -interaction=nonstopmode -halt-on-error "%s" > "%s"'
+                                % (tmp_dir, tex_file, out_file), shell=True)
+            else:
+                # Setting `latexcmd` to following string produces the same result as xelatex condition:
+                # 'xelatex "-output-directory={tmp_dir}" -interaction=nonstopmode -halt-on-error "{tex_file}" > "{out_file}"'
+                cmd = " CMD executed: {}".format(self.options.latexcmd.format(
+                    tmp_dir=tmp_dir, tex_file=tex_file, out_file=out_file))
+                subprocess.call(self.options.latexcmd.format(
+                    tmp_dir=tmp_dir, tex_file=tex_file, out_file=out_file), shell=True)
+
+            if not os.path.exists(pdf_file):
+                print("Latex error: check your latex file and preamble.",
+                      file=sys.stderr)
+                print(cmd, file=sys.stderr)
+                print(open(log_file).read(), file=sys.stderr)
+                return
+            else:
+                if self.options.pdftosvg == '1':
+                    subprocess.call('pdf2svg %s %s' %
+                                    (pdf_file, svg_file), shell=True)
+                    self.merge_pdf2svg_svg(svg_file)
+                else:
+                    subprocess.call('pstoedit -f plot-svg "%s" "%s"  -dt -ssp -psarg -r9600x9600 > "%s" 2> "%s"'
+                                    % (pdf_file, svg_file, out_file, err_file), shell=True)
+                    self.merge_pstoedit_svg(svg_file)
+
+            os.remove(tex_file)
+            os.remove(log_file)
+            os.remove(out_file)
+            if os.path.exists(err_file):
+                os.remove(err_file)
+            if os.path.exists(aux_file):
+                os.remove(aux_file)
+            if os.path.exists(svg_file):
+                os.remove(svg_file)
+            if os.path.exists(pdf_file):
+                os.remove(pdf_file)
+            os.rmdir(tmp_dir)
+
+    def merge_pstoedit_svg(self, svg_file):
+        def svg_to_group(self, svgin):
+            innode = svgin.tag.rsplit('}', 1)[-1]
+            # replace svg with group by select specific elements
+            if innode == 'svg':
+                svgout = inkex.etree.Element(inkex.addNS('g', 'WriteTexNS'))
+            else:
+                svgout = inkex.etree.Element(inkex.addNS(innode, 'WriteTexNS'))
+                for att in svgin.attrib:
+                    svgout.attrib[att] = svgin.attrib[att]
+
+            for child in svgin.iterchildren():
+                tag = child.tag.rsplit('}', 1)[-1]
+                if tag in ['g', 'path', 'line']:
+                    child = svg_to_group(self, child)
+                    svgout.append(child)
+
+            # TODO: add crop range code here.
+
+            return svgout
+
+        doc = inkex.etree.parse(svg_file)
+        svg = doc.getroot()
+        newnode = svg_to_group(self, svg)
+        newnode.attrib['{%s}text' %
+                       WriteTexNS] = self.text.encode('string-escape')
+
+        replace = False
+
+        for i in self.options.ids:
+            node = self.selected[i]
+            if node.tag != '{%s}g' % SVG_NS:
+                continue
+            if '{%s}text' % WriteTexNS in node.attrib:
+                replace = True
+                break
+
+        if replace:
+            try:
+                if self.options.rescale == 'true':
+                    newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
+                        800*self.options.scale, 800*self.options.scale,
+                        self.view_center[0],
+                        self.view_center[1])
+                else:
+                    if 'transform' in node.attrib:
+                        newnode.attrib['transform'] = node.attrib['transform']
+                    else:
+                        newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
+                            800*self.options.scale, 800*self.options.scale,
+                            self.view_center[0],
+                            self.view_center[1])
+                newnode.attrib['style'] = node.attrib['style']
+            except:
+                pass
+            p = node.getparent()
+            p.remove(node)
+            p.append(newnode)
+        else:
+            newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
+                800*self.options.scale, 800*self.options.scale,
+                self.view_center[0],
+                self.view_center[1])
+            self.current_layer.append(newnode)
+
+    def merge_pdf2svg_svg(self, svg_file):
+        # This is the smallest point coordinates assumed
+        MAX_XY = [-10000000, -10000000]
+
+        def svg_to_group(self, svgin):
+            target = {}
+            for node in svgin.xpath('//*[@id]'):
+                target['#'+node.attrib['id']] = node
+
+            for node in svgin.xpath('//*'):
+                if ('{%s}href' % XLINK_NS) in node.attrib:
+                    href = node.attrib['{%s}href' % XLINK_NS]
+                    p = node.getparent()
+                    p.remove(node)
+                    trans = 'translate(%s,%s)' % (
+                        node.attrib['x'], node.attrib['y'])
+                    for i in target[href].iterchildren():
+                        i.attrib['transform'] = trans
+                        x, y = self.parse_transform(trans)
+                        if x > MAX_XY[0]:
+                            MAX_XY[0] = x
+                        if y > MAX_XY[1]:
+                            MAX_XY[1] = y
+                        p.append(copy.copy(i))
+
+            svgout = inkex.etree.Element(inkex.addNS('g', 'WriteTexNS'))
+            for node in svgin:
+                if node is svgout:
+                    continue
+                if node.tag == '{%s}defs' % SVG_NS:
+                    continue
+                svgout.append(node)
+            return svgout
+
+        doc = inkex.etree.parse(svg_file)
+        svg = doc.getroot()
+        newnode = svg_to_group(self, svg)
+        newnode.attrib['{%s}text' %
+                       WriteTexNS] = self.text.encode('string-escape')
+
+        replace = False
+
+        for i in self.options.ids:
+            node = self.selected[i]
+            if node.tag != '{%s}g' % SVG_NS:
+                continue
+            if '{%s}text' % WriteTexNS in node.attrib:
+                replace = True
+                break
+
+        if replace:
+            try:
+                if self.options.rescale == 'true':
+                    newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
+                        self.options.scale, self.options.scale,
+                        self.view_center[0],
+                        self.view_center[1])
+                else:
+                    if 'transform' in node.attrib:
+                        newnode.attrib['transform'] = node.attrib['transform']
+                    else:
+                        newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
+                            self.options.scale, self.options.scale,
+                            self.view_center[0]-MAX_XY[0]*self.options.scale,
+                            self.view_center[1]-MAX_XY[1]*self.options.scale)
+                newnode.attrib['style'] = node.attrib['style']
+            except:
+                pass
+            p = node.getparent()
+            p.remove(node)
+            p.append(newnode)
+        else:
+            self.current_layer.append(newnode)
+            newnode.attrib['transform'] = 'matrix(%f,0,0,%f,%f,%f)' % (
+                self.options.scale, self.options.scale,
+                self.view_center[0]-MAX_XY[0]*self.options.scale,
+                self.view_center[1]-MAX_XY[1]*self.options.scale)
+
+    @staticmethod
+    def parse_transform(transf):
+        if transf == "" or transf is None:
+            return(0, 0)
+        stransf = transf.strip()
+        result = re.match(
+            r"(translate|scale|rotate|skewX|skewY|matrix)\s*\(([^)]*)\)\s*,?",
+            stransf)
+        if result.group(1) == "translate":
+            args = result.group(2).replace(',', ' ').split()
+            dx = float(args[0])
+            if len(args) == 1:
+                dy = 0.0
+            else:
+                dy = float(args[1])
+            return (dx, dy)
+        else:
+            return (0, 0)
+
+
+if __name__ == '__main__':
+    e = WriteTex()
+    e.affect()