From e60648dadd99c066f56f2d7caa4129f3c7194bca Mon Sep 17 00:00:00 2001
From: Revar Desmera <revarbat@gmail.com>
Date: Wed, 10 Jul 2019 13:03:17 -0700
Subject: [PATCH] Make stroke() assert that path is 2D.

---
 shapes2d.scad | 1 +
 1 file changed, 1 insertion(+)

diff --git a/shapes2d.scad b/shapes2d.scad
index d09c585..3843430 100644
--- a/shapes2d.scad
+++ b/shapes2d.scad
@@ -33,6 +33,7 @@ module stroke(path, width=1, endcaps=true, close=false)
 {
 	$fn = quantup(segs(width/2),4);
 	path = close? concat(path,[path[0]]) : path;
+	assert(is_list(path) && is_vector(path[0]) && len(path[0])==2, "path must be a 2D list of points.");
 	segments = pair(path);
 	segpairs = pair(segments);