deduplicated sierpinski triangle algorithms

Author: Jakub Klinkovský

fractals/sierpinskeho_trojuhelnik.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+
+import builtins
+import turtle as t
+
+import _lib
+
+builtins.iteration = 10
+builtins.position = (-300, -250)
+builtins.size = 600
+
+def sierpinski_triangle(iteration, size, direction=1):
+    t.pendown()
+    if iteration == 1:
+        for i in range(3):
+            t.forward(size)
+            t.left(120 * direction)
+    else:
+        sierpinski_triangle(iteration-1, size/2, direction)
+        t.forward(size/2)
+        t.left(60 * direction)
+        sierpinski_triangle(iteration-1, size/2, -direction)
+        t.forward(size/2)
+        t.left(60 * direction)
+        sierpinski_triangle(iteration-1, size/2, direction)
+
+        t.penup()
+        t.right(60 * direction)
+        t.backward(size/2)
+        t.right(60 * direction)
+        t.backward(size/2)
+
+if __name__ == "__main__":
+    _lib.init()
+    sierpinski_triangle(iteration, size)
+    _lib.exit()