Bug 2514 - mettre à jour le plan de câblage alimentation des serveurs communs

amélioration: désormais le diagramme fait bien ressortir les câblages qui méritent de l'attention :
- en rouge les cables en surcharge (dont l'ampérage max peut dépasser la capacité)
- en noir les cables qui n'ont pas de charge

Pour que le rouge soit réservé aux cables à problème, les conventions de couleurs pour les cables non surchargés ont été modifieés : c'est désormais en teintes de bleu.

PowerDiagram.py

@@ -261,8 +261,49 @@ class PowerConfig(object):
             s += str(c) + '\n'
         return s
 
+class CableColorer(object):
+
+    def get_cable_color(self, amperes, capacity):
+        raise NotImplementedError
+
+class SimpleColorer(CableColorer):
+
+    def get_cable_color(self, amperes, capacity):
+        saturation = amperes / capacity
+        if saturation > 1.0:
+            color = '/svg/red'
+        elif saturation > 0.75:
+            color = '/svg/orange'
+        elif saturation < 0.001:
+            color = '/svg/black'  # probably an error
+        else:
+            color = '/svg/green'
+        return color
+
+class RampColorer(CableColorer):
+
+    @staticmethod
+    def hotness_to_hsv_color(hotness):
+        """
+        :param float hotness: temperature of the wire ratio (0.0 : cold -> 1.0 : hot)
+        """
+        clamped_hotness = max(min(hotness, 1.0), 0.0)
+        return "%f, 1.0, 0.8" % ((clamped_hotness) * 0.33 + 0.33)
+
+    def get_cable_color(self, amperes, capacity):
+        saturation = amperes / capacity
+        # color = RampColorer.hotness_to_hsv_color(pow(saturation, 4.0))
+        clamped_saturation = max(min(saturation, 1.0), 0.0)
+        color = '/ylgnbu9/%d' % (int(clamped_saturation * 5) + 4)
+
+        if saturation < 0.001:
+            color = '/svg/black'  # probably an error
+        elif saturation > 1.0:
+            color = '/svg/red'
+        return color
 
 def power_config_to_svg(power_config, svg_file_path):
+
     """
     creates a svg diagram representing the input power configuration
     
@@ -280,12 +321,6 @@ def power_config_to_svg(power_config, svg_file_path):
     graph.edge_attr['fontsize'] = 10  # default : 14 pt
     graph.edge_attr['len'] = 1.5  # default : 1.0
     
-    def hotness_to_hsv_color(hotness):
-        """
-        :param float hotness: temperature of the wire ratio (0.0 : cold -> 1.0 : hot)
-        """
-        clamped_hotness = max(min(hotness, 1.0), 0.0)
-        return "%f, 1.0, 0.8" % ((1.0 - clamped_hotness) * 0.33)
 
     # graph.add_node('a')
     # graph.add_node('b')
@@ -316,6 +351,8 @@ def power_config_to_svg(power_config, svg_file_path):
                 y += 1.0
             x += 1.0
 
+    cable_colorer = RampColorer()
+
     for con in power_config.connections:
         # print(con.from_plug.machine.name, con.to_plug.machine.name)
         if not con.is_redundancy_cable():  # don't display redundancy cables, as they might overlap and hide the main one
@@ -330,13 +367,7 @@ def power_config_to_svg(power_config, svg_file_path):
                 penwidth = 100.0 * penwidth_scaler  # make the problem clearly visible
             else:
                 max_amp = str(capacity) + 'A'
-                if amperes / capacity > 1.0:
-                    color = 'red'
-                elif amperes / capacity > 0.75:
-                    color = 'orange'
-                else:
-                    color = 'green'
-                color = hotness_to_hsv_color(pow(amperes / capacity, 4.0))
+                color = cable_colorer.get_cable_color(amperes, capacity)
                 penwidth = capacity * penwidth_scaler
             label = "%.1f/%s" % (amperes, max_amp)
             # color='//%d' % int(9.0-amperes/capacity*8)