Better edge width

birdvisu/annotations/layout.py

@@ -225,9 +225,10 @@ class PlaceUnplacedVertices(StyleAnnotator):
 		return result
 
 def _default_width_for_cost(cost):
-	from math import log2
+	# Maybe use exponential decay?
-	if cost <= 2: return 1
+	if cost > 0: return 10/cost
-	return int(log2(cost))
+	# As thin as possible for no-weight edges (e.g. network → router)
+	return 0
 class EdgeWidthByCost(StyleAnnotator):
 	idempotent = True
 	def __init__(self, param):