From 2e4d6b40371974534c3896b11c6f2277fe2d4843 Mon Sep 17 00:00:00 2001
From: Rock Storm <rockstorm@gmx.com>
Date: Tue, 2 Oct 2018 18:31:37 +0100
Subject: [PATCH] regular_shapes: Avoid the circle trick

As is stated in the very own manual of OpenSCAD [1], generating polygons
using the circle function is a trick that should be avoided.

 [1]
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/2D_Primitives#regular_polygon
---
 regular_shapes.scad | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/regular_shapes.scad b/regular_shapes.scad
index 667d272..54d61fd 100644
--- a/regular_shapes.scad
+++ b/regular_shapes.scad
@@ -33,7 +33,11 @@ module reg_polygon(sides,radius)
   if(sides<2) square([radius,0]);
   if(sides==3) triangle(radius);
   if(sides==4) square([dia(radius),dia(radius)],center=true);
-  if(sides>4) circle(r=radius,$fn=sides);
+  if(sides>4) {
+    angles=[ for (i = [0:sides-1]) i*(360/sides) ];
+    coords=[ for (th=angles) [radius*cos(th), radius*sin(th)] ];
+    polygon(coords);
+  }
 }
 
 module pentagon(radius)