From b1a8056c51896247461141571ae3fa226a29a7da Mon Sep 17 00:00:00 2001
From: Adrian Mariano <avm4@cornell.edu>
Date: Tue, 5 Jan 2021 23:39:07 -0500
Subject: [PATCH] Check N=integer

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

diff --git a/shapes2d.scad b/shapes2d.scad
index 7a94b71..e3cfb3a 100644
--- a/shapes2d.scad
+++ b/shapes2d.scad
@@ -381,6 +381,7 @@ function arc(N, r, angle, d, cp, points, width, thickness, start, wedge=false, l
     assert(is_bool(endpoint))
     !endpoint ? assert(!wedge, "endpoint cannot be false if wedge is true")
                slice(arc(N,r,angle,d,cp,points,width,thickness,start,wedge,long,cw,ccw,true),0,-2) :
+    assert(is_integer(N), "Number of points must be an integer")
     // First try for 2D arc specified by width and thickness
     is_def(width) && is_def(thickness)? (
                 assert(!any_defined([r,cp,points]) && !any([cw,ccw,long]),"Conflicting or invalid parameters to arc")