web/views/dotgraphview.py
author Julien Cristau <julien.cristau@logilab.fr>
Thu, 03 Jul 2014 12:18:34 +0200
changeset 9867 7f36f31d8828
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child 10666 7f6b5f023884
permissions -rw-r--r--
Added tag cubicweb-version-3.19.2, cubicweb-debian-version-3.19.2-1, cubicweb-centos-version-3.19.2-1 for changeset 8ac2202866e7
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""some basic stuff to build dot generated graph images"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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import tempfile
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import os
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import codecs
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from logilab.mtconverter import xml_escape
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from logilab.common.graph import GraphGenerator, DotBackend
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from cubicweb.view import EntityView
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from cubicweb.utils import make_uid
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class DotGraphView(EntityView):
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    __abstract__ = True
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    backend_class = DotBackend
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    backend_kwargs = {'ratio': 'compress', 'size': '30,10'}
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    def cell_call(self, row, col):
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        if 'MSIE 8' in self._cw.useragent():
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            return
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        entity = self.cw_rset.get_entity(row, col)
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        visitor = self.build_visitor(entity)
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        prophdlr = self.build_dotpropshandler()
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        graphname = 'dotgraph%s' % str(entity.eid)
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        generator = GraphGenerator(self.backend_class(graphname, None,
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                                                      **self.backend_kwargs))
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        # image file
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        fd, tmpfile = tempfile.mkstemp('.svg')
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        os.close(fd)
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        generator.generate(visitor, prophdlr, tmpfile)
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        with codecs.open(tmpfile, 'rb', encoding='utf-8') as svgfile:
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            self.w(svgfile.read())
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    def build_visitor(self, entity):
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        raise NotImplementedError
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    def build_dotpropshandler(self):
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        return DotPropsHandler(self._cw)
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class DotPropsHandler(object):
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    def __init__(self, req):
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        self._ = req._
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    def node_properties(self, entity):
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        """return default DOT drawing options for a state or transition"""
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        return {'label': entity.dc_long_title(),
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                'href': entity.absolute_url(),
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                'fontname': 'Courier', 'fontsize': 10, 'shape':'box',
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                 }
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    def edge_properties(self, transition, fromstate, tostate):
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        return {'label': '', 'dir': 'forward',
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                'color': 'black', 'style': 'filled'}