Allow to use color attribute on y fields

tryton/common/common.py

@@ -411,11 +411,11 @@ def generateColorscheme(masterColor, keys, light=0.098):
     given by the light argument.
     The masterColor is given in a hex string format.
     """
-    r, g, b = hex2rgb(_COLOR_SCHEMES.get(masterColor, masterColor))
+    r, g, b = hex2rgb(COLOR_SCHEMES.get(masterColor, masterColor))
     return dict([(key, lighten(r, g, b, light * i))
         for i, key in enumerate(keys)])
 
-_COLOR_SCHEMES = {
+COLOR_SCHEMES = {
     'red': '#6d1d1d',
     'green': '#3c581a',
     'blue': '#224565',

tryton/gui/window/view_form/view/graph_gtk/graph.py

@@ -1,5 +1,5 @@
 import gtk
-from tryton.common import hex2rgb, generateColorscheme, DT_FORMAT
+from tryton.common import hex2rgb, generateColorscheme, DT_FORMAT, COLOR_SCHEMES
 import locale
 import math
 import datetime
@@ -374,6 +374,10 @@ class Graph(gtk.DrawingArea):
         keys = self._getDatasKeys()
         self.colorScheme = generateColorscheme(
                 self.attrs.get('color', 'blue'), keys + ['__highlight'])
+        for yfield in self.yfields:
+            if yfield.get('color'):
+                self.colorScheme[yfield['name']] = hex2rgb(
+                        COLOR_SCHEMES.get(yfield['color'], yfield['color']))
 
     def _getDatasKeys(self):
         return [x['name'] for x in self.yfields]