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# Copyright (c) 2011, 2012 Free Software Foundation
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from django.http import HttpResponse
from django.shortcuts import render_to_response
from django.template import RequestContext
from models import Graph
from django.template import Template
from os import system
from django.conf import settings
import os
from os.path import join
_tmpdir = '/tmp' #os.environ['TMP']
class TEdge:
def __init__(self, data, graph):
self.start_node, self.end_node = data.gv_ends(graph)
self.start_node_label = self.start_node.gv_node_label(graph)
self.end_node_label = self.end_node.gv_node_label(graph)
self.label = data.gv_edge_label(graph)
class TGraph:
def __init__(self, graph):
self.edges = []
for e in graph.content_object.gv_edges(graph):
self.edges.append(TEdge(e, graph))
def dot_file(request, slug, view=False, template='graphviz/dot_file.dot'):
graph = Graph.objects.get(slug=slug)
context = {'graph':TGraph(graph)}
response = render_to_response(template, context, mimetype='text/plain',
context_instance=RequestContext(request))
if not view:
response['Content-Disposition'] = 'attachment; filename=%s.dot' % slug
return response
def image_file(request, slug, template='graphviz/dot_file.html'):
resp = dot_file(request, slug, template)
path_dot = join(_tmpdir, 'graphviz_tmp.dot')
tdot = open(path_dot, 'w')
tdot.write(resp.content)
tdot.close()
system('%s %s Tpng -o %s.png' % (settings.GRAPHVIZ_DOT_CMD, path_dot, path_dot))
return HttpResponse('image '+path_dot+'.png')
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