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A helper module for creating Inkscape extensions
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Copyright (C) 2005,2007 Aaron Spike, aaron@ekips.org
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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import sys, copy, optparse, random, re
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#a dictionary of all of the xmlns prefixes in a standard inkscape doc
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u'sodipodi' :u'http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd',
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u'cc' :u'http://creativecommons.org/ns#',
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u'ccOLD' :u'http://web.resource.org/cc/',
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u'svg' :u'http://www.w3.org/2000/svg',
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u'dc' :u'http://purl.org/dc/elements/1.1/',
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u'rdf' :u'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
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u'inkscape' :u'http://www.inkscape.org/namespaces/inkscape',
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u'xlink' :u'http://www.w3.org/1999/xlink',
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u'xml' :u'http://www.w3.org/XML/1998/namespace'
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#a dictionary of unit to user unit conversion factors
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uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'pc':15.0}
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'''Returns userunits given a string representation of units in another system'''
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unit = re.compile('(%s)$' % '|'.join(uuconv.keys()))
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param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
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p = param.match(string)
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u = unit.search(string)
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retval = float(p.string[p.start():p.end()])
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return retval * uuconv[u.string[u.start():u.end()]]
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def uutounit(val, unit):
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return val/uuconv[unit]
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from lxml import etree
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sys.exit(_('The fantastic lxml wrapper for libxml2 is required by inkex.py and therefore this extension. Please download and install the latest version from http://cheeseshop.python.org/pypi/lxml/, or install it through your package manager by a command like: sudo apt-get install python-lxml'))
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sys.stderr.write(str(what) + "\n")
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"""Intended for end-user-visible error messages.
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(Currently just writes to stderr with an appended newline, but could do
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something better in future: e.g. could add markup to distinguish error
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messages from status messages or debugging output.)
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Note that this should always be combined with translation:
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inkex.errormsg(_("This extension requires two selected paths."))
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sys.stderr.write((str(msg) + "\n").encode("UTF-8"))
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def check_inkbool(option, opt, value):
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if str(value).capitalize() == 'True':
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elif str(value).capitalize() == 'False':
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raise optparse.OptionValueError("option %s: invalid inkbool value: %s" % (opt, value))
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def addNS(tag, ns=None):
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if ns!=None and len(ns)>0 and NSS.has_key(ns) and len(tag)>0 and tag[0]!='{':
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val = "{%s}%s" % (NSS[ns], tag)
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class InkOption(optparse.Option):
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TYPES = optparse.Option.TYPES + ("inkbool",)
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TYPE_CHECKER = copy.copy(optparse.Option.TYPE_CHECKER)
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TYPE_CHECKER["inkbool"] = check_inkbool
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"""A class for creating Inkscape SVG Effects"""
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def __init__(self, *args, **kwargs):
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self.OptionParser = optparse.OptionParser(usage="usage: %prog [options] SVGfile",option_class=InkOption)
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self.OptionParser.add_option("--id",
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action="append", type="string", dest="ids", default=[],
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help="id attribute of object to manipulate")
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def getoptions(self,args=sys.argv[1:]):
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"""Collect command line arguments"""
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self.options, self.args = self.OptionParser.parse_args(args)
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def parse(self,file=None):
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"""Parse document in specified file or on stdin"""
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stream = open(file,'r')
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stream = open(self.args[-1],'r')
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self.document = etree.parse(stream)
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def getposinlayer(self):
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self.current_layer = self.document.getroot()
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self.view_center = (0.0,0.0)
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layerattr = self.document.xpath('//sodipodi:namedview/@inkscape:current-layer', namespaces=NSS)
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layername = layerattr[0]
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layer = self.document.xpath('//svg:g[@id="%s"]' % layername, namespaces=NSS)
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self.current_layer = layer[0]
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xattr = self.document.xpath('//sodipodi:namedview/@inkscape:cx', namespaces=NSS)
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yattr = self.document.xpath('//sodipodi:namedview/@inkscape:cy', namespaces=NSS)
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doc_height = unittouu(self.document.getroot().get('height'))
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self.view_center = (float(x), doc_height - float(y)) # FIXME: y-coordinate flip, eliminate it when it's gone in Inkscape
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def getselected(self):
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"""Collect selected nodes"""
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for i in self.options.ids:
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path = '//*[@id="%s"]' % i
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for node in self.document.xpath(path, namespaces=NSS):
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self.selected[i] = node
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docIdNodes = self.document.xpath('//@id', namespaces=NSS)
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def getNamedView(self):
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return self.document.xpath('//sodipodi:namedview', namespaces=NSS)[0]
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def createGuide(self, posX, posY, angle):
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'position': str(posX)+','+str(posY),
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'orientation': str(sin(radians(angle)))+','+str(-cos(radians(angle)))
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guide = etree.SubElement(
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addNS('guide','sodipodi'), atts )
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"""Serialize document into XML on stdout"""
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self.document.write(sys.stdout)
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def affect(self, args=sys.argv[1:], output=True):
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"""Affect an SVG document with a callback effect"""
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self.getoptions(args)
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if output: self.output()
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def uniqueId(self, old_id, make_new_id = True):
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while new_id in self.doc_ids:
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new_id += random.choice('0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
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self.doc_ids[new_id] = 1
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def xpathSingle(self, path):
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retval = self.document.xpath(path, namespaces=NSS)[0]
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errormsg(_("No matching node for expression: %s") % path)
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# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99