# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1443979396 -7200
# Node ID 25b72160e5c937f788c62032dbb957f956f7ed08
# Parent  a53123d8da0a198c8bac914f17f92a094249d485# Parent  0634014ddde59f6867527f85e68c1d37624277e6
Limit colour exchange to those below a certain frequency threshold.

diff -r a53123d8da0a -r 25b72160e5c9 optimiser.py
--- a/optimiser.py	Sun Oct 04 15:17:31 2015 +0200
+++ b/optimiser.py	Sun Oct 04 19:23:16 2015 +0200
@@ -174,7 +174,7 @@
                 else:
                     c[value] += f
 
-        c = [(n, value) for value, n in c.items()]
+        c = [(n/width, value) for value, n in c.items()]
         c.sort(reverse=True)
         colours.append(c)
 
@@ -192,8 +192,14 @@
         least = [value for n, value in c[4:]]
 
         if least:
-            i = randrange(4, len(c))
-            c = c[:3] + c[i:i+1] + c[4:i] + c[i+1:]
+            switched = []
+            for j in 1, 2:
+                i = randrange(0, 4)
+                n, value = c[i]
+                if n < 0.1:
+                    switched.append(c[i])
+                del c[i]
+            c += switched
             most = [value for n, value in c[:4]]
             least = [value for n, value in c[4:]]