From 92d57a031243e7aa0b55adc0374c60d6d13c2bac Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Thu, 13 Feb 2020 14:11:39 +0800
Subject: [PATCH] add tf_ring

---
 src/experimental/tf_ring.scad | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 src/experimental/tf_ring.scad

diff --git a/src/experimental/tf_ring.scad b/src/experimental/tf_ring.scad
new file mode 100644
index 00000000..67c0ce12
--- /dev/null
+++ b/src/experimental/tf_ring.scad
@@ -0,0 +1,10 @@
+use <rotate_p.scad>;
+use <experimental/tf_y_twist.scad>;
+
+function tf_ring(size, point, radius, angle, twist = 0) = 
+    let(
+        yleng = size[1],
+        a_step = angle / yleng,
+        twisted = tf_y_twist(size, point, twist)
+    )
+    rotate_p([radius + twisted[0], 0, twisted[2]], a_step * twisted[1]);
\ No newline at end of file