From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 18 Mar 2018 12:18:31 +0000 (+0000)
Subject: utils: introduce atan2vector (no users yet)
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;ds=sidebyside;h=9c7e980c238fb797c0651d3082e3177e6742aed3;p=reprap-play.git

utils: introduce atan2vector (no users yet)

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/funcs.scad.cpp b/funcs.scad.cpp
index 92292be..5857c93 100644
--- a/funcs.scad.cpp
+++ b/funcs.scad.cpp
@@ -16,6 +16,8 @@ function vectorlen(v)   = sqrt(vsq(0) + vsq(1) + vsq(2));
 function unitvector2d(v) = v / vectorlen2d(v);
 function unitvector(v)   = v / vectorlen(v);
 
+function atan2vector(v) = atan2(v[1], v[0]);
+
 // | m[0][0] m[0][1] |
 // | m[1][0] m[1][1] |
 function determinant2(m) = (m[0][0] * m[1][1] - m[0][1] * m[1][0]);