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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.db import models
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic
class Graph(models.Model):
""" the object defined by the generic relation should have
a method gv_links(graph) that returns a sequence of links.
a method gv_nodes(graph) that returns a sequence of nodes.
a link should have a method gv_ends(graph) that returns a sequence
of nodes [start, end].
a link may have a method gv_visual(graph) that returns a ArrowVisual instance or None
a node may have a method gv_visual(graph) that returns
a NodeVisual instance or None.
links may have a gv_link_label(graph) method
nodes may have a gv_node_label(graph) method
see also interfaces.py module.
"""
slug = models.SlugField(primary_key=True)
name = models.CharField(max_length=50)
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = generic.GenericForeignKey('content_type', 'object_id')
def view_dot_file(self):
return '<a href=/graphviz/dot_view/%s/>view</a>' % self.slug
view_dot_file.allow_tags = True
def download_dot_file(self):
return '<a href=/graphviz/dot_file/%s/>download</a>' % self.slug
download_dot_file.allow_tags = True
def download_image(self):
return '<a href=/graphviz/image_file/%s/>download (TODO)</a>' % self.slug
download_image.allow_tags = True
def __unicode__(self):
return self.name
class Meta:
verbose_name_plural = 'Graphes'
NODE_SHAPE_CHOICES = (('box','Box'),
('circle','Circle'),
('doublecircle','Double circle'),
('box3d','Box 3D'),
('diamond','Diamond'),
)
class NodeVisual(models.Model):
""" the content_type attribute is used to define the default Node
when no method gv_node is provided.
"""
shape = models.CharField(max_length=50, default='circle', choices=NODE_SHAPE_CHOICES)
graph = models.ForeignKey(Graph)
content_type = models.ForeignKey(ContentType)
def __unicode__(self):
return self.shape
ARROW_SHAPE_CHOICES = (('box','box'),
('crow','crow'),
('diamond','diamond'),
('dot','dot'),
('inv','inv'),
('none','none'),
('normal','normal'),
('tee','tee'),
('vee','vee'),
)
ARROW_MODIFIER_CHOICES = (('l','left'),
('r','right'),
('o','non-filled'),
)
class ArrowVisual(models.Model):
""" the content_type attribute is used to define the default Arrow
when no method gv_arrow is provided.
"""
shape = models.CharField(max_length=50, default='normal', choices=ARROW_SHAPE_CHOICES)
modifier = models.CharField(max_length=1, default='r', choices=ARROW_MODIFIER_CHOICES)
graph = models.ForeignKey(Graph)
content_type = models.ForeignKey(ContentType)
def __unicode__(self):
return self.shape
class CacheImage(models.Model):
date = models.DateTimeField(auto_now_add=True)
valid = models.BooleanField(default=True)
graph = models.ForeignKey(Graph)
file = models.ImageField(upload_to='graph_images')
def graphic(self):
return '<img name=image%d src=%s>' % (self.pk, self.file.url)
graphic.allow_tags = True
def __unicode__(self):
return self.graph.name
class Meta:
verbose_name_plural = 'Caches images'
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