From 7e9a0cd8cccd9efc66ee4755c86208b22573a283 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Sun, 7 May 2017 15:41:11 +0800
Subject: [PATCH] Revert "rewrote to use polygon"

This reverts commit a442ef68e0831f9061ba4e12d5406b543958f77b.
---
 src/circular_sector.scad | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/src/circular_sector.scad b/src/circular_sector.scad
index df865abe..e752e5de 100644
--- a/src/circular_sector.scad
+++ b/src/circular_sector.scad
@@ -15,19 +15,18 @@ include <__private__/__frags.scad>;
 module circular_sector(radius, angles) {
     frags = __frags(radius);
     
-    a_step = 360 / frags;
-    
-    m = floor(angles[0] / a_step) + 1;
-    n = floor(angles[1] / a_step);
-    
-    points = concat(
-        [[0, 0], radius * [cos(angles[0]), sin(angles[0])]],
-        [
-            for(i = [m:n]) 
-                radius * [cos(a_step * i), sin(a_step * i)]
+    r = radius / cos(180 / frags);
+    step = -360 / frags; 
+
+    points = concat([[0, 0]],
+        [for(a = [angles[0] : step : angles[1] - 360]) 
+            [r * cos(a), r * sin(a)]
         ],
-        [radius *  [cos(angles[1]), sin(angles[1])]]
+        [[r * cos(angles[1]), r * sin(angles[1])]]
     );
 
-    polygon(points);
+    difference() {
+        circle(radius);
+        polygon(points);
+    }
 }
\ No newline at end of file