refactor c3nav.routing

src/c3nav/routing/graph/graph.py

@@ -0,0 +1,20 @@
+from c3nav.mapdata.models import Level
+from c3nav.routing.graph.connection import GraphConnection
+from c3nav.routing.graph.level import GraphLevel
+
+
+class Graph():
+    def __init__(self):
+        self.levels = {}
+        self.connections = []
+
+    def build(self):
+        for level in Level.objects.all():
+            self.levels[level.name] = GraphLevel(self, level)
+
+        for level in self.levels.values():
+            level.build()
+            level.draw_png()
+
+    def add_connection(self, from_point, to_point):
+        self.connections.append(GraphConnection(self, from_point, to_point))