From 850defccb747bbb04ffbbee94e4646a7ddb28505 Mon Sep 17 00:00:00 2001
From: Colin Beveridge <colin@colinbeveridge.co.uk>
Date: Wed, 24 Jun 2026 08:16:40 +0000
Subject: [PATCH] Thue-Morse plotter

Draw a pretty pattern based on the Thue-Morse sequence.
---
 plot.py | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 plot.py

diff --git a/plot.py b/plot.py
new file mode 100644
index 0000000..24c2eb0
--- /dev/null
+++ b/plot.py
@@ -0,0 +1,32 @@
+import turtle
+
+SIZE = 5
+ANGLE = 108
+X0 = 0 
+Y0 = 400
+DOUBLES = 14 # 14 takes "many minutes" on my machine. Each extra double doubles space and time required.
+thue = "ABBA"
+turtle.penup()
+turtle.speed(0)
+turtle.setx(X0)
+turtle.sety(Y0)
+
+def extend(thue):
+	opp = ""
+	for i in thue:
+		if i == "A":
+			opp += "B"
+		else:
+			opp += "A"
+	return thue + opp
+
+for i in range(14):
+	thue = extend(thue)
+	
+turtle.pendown()
+for t in thue:
+	if t == "A":
+		turtle.forward(SIZE)
+	else:
+		turtle.forward(SIZE*2)
+	turtle.right(ANGLE)