# HG changeset patch
# User Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
# Date 1226569415 -3600
# Node ID 5ff3ca010290294e65b49fa1a084c1238e8ae3cc
# Parent  e5cd878dc79691e3733b1d1c6597d30390c11bbc
improve dot schema rendering by associating edge colors and label colors

diff -r e5cd878dc796 -r 5ff3ca010290 web/views/dynimages.py
--- a/web/views/dynimages.py	Wed Nov 12 19:19:53 2008 -0800
+++ b/web/views/dynimages.py	Thu Nov 13 10:43:35 2008 +0100
@@ -8,6 +8,7 @@
 
 import os
 from tempfile import mktemp
+from itertools import cycle
 
 from logilab.common.graph import escape, GraphGenerator, DotBackend
 from yams import schema2dot as s2d
@@ -17,6 +18,9 @@
 
 class RestrictedSchemaDotPropsHandler(s2d.SchemaDotPropsHandler):
     def __init__(self, req):
+        # FIXME: colors are arbitrary
+        self.nextcolor = cycle( ('#aa0000', '#00aa00', '#0000aa',
+                                 '#000000', '#888888') ).next
         self.req = req
         
     def display_attr(self, rschema):
@@ -32,7 +36,19 @@
         label.append(r'\l}') # trailing \l ensure alignement of the last one
         return {'label' : ''.join(label), 'shape' : "record",
                 'fontname' : "Courier", 'style' : "filled"}
+
+    def edge_properties(self, rschema, subjnode, objnode):
+        kwargs = super(RestrictedSchemaDotPropsHandler, self).edge_properties(rschema, subjnode, objnode)
+        # symetric rels are handled differently, let yams decide what's best
+        if not rschema.symetric:
+            kwargs['color'] = self.nextcolor()
+        kwargs['fontcolor'] = kwargs['color']
+        # dot label decoration is just awful (1 line underlining the label
+        # + 1 line going to the closest edge spline point)
+        kwargs['decorate'] = 'false'
+        return kwargs
     
+
 class RestrictedSchemaVisitorMiIn:
     def __init__(self, req, *args, **kwargs):
         # hack hack hack