From cd46a948df130197c8b8b57f7cabee4fbcc02c70 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Mon, 17 Feb 2020 14:30:46 +0800
Subject: [PATCH] add tf_bend

---
 src/experimental/tf_bend.scad | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 src/experimental/tf_bend.scad

diff --git a/src/experimental/tf_bend.scad b/src/experimental/tf_bend.scad
new file mode 100644
index 00000000..3c7f45de
--- /dev/null
+++ b/src/experimental/tf_bend.scad
@@ -0,0 +1,18 @@
+/*
+    size: The size of the rectangle which can contain the point.
+    point: A point in the rectangle.
+    radius: The radius of the arc after being bent
+    angle: The central angle of the arc.
+*/
+
+function tf_bend(size, point, radius, angle) = 
+    let(
+        xlen = size[0],
+        // ignored
+        // ylen = size[1],
+        y = point[0],
+        z = point[1],
+        a_step = angle / xlen,
+        a = a_step * y
+    )
+    [radius * cos(a), radius * sin(a), z];
\ No newline at end of file