From 354d1fd7a8411224119291a3e763cd5577584069 Mon Sep 17 00:00:00 2001
From: Michael <m@ash.to>
Date: Thu, 25 Aug 2022 15:42:09 +0200
Subject: [PATCH] don't do arc for zero

---
 index.html            |  4 ++--
 stitchcode/objects.js | 10 ++++++----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/index.html b/index.html
index 7233c7e6..0c91c1c1 100644
--- a/index.html
+++ b/index.html
@@ -46,9 +46,9 @@
     <script type="text/javascript" src="stitchcode/symbols.js?version=2021-12-14"></script>
     <script type="text/javascript" src="stitchcode/blocks.js?version=2021-12-14"></script>
     <script type="text/javascript" src="stitchcode/threads.js?version=2021-12-14"></script>
-    <script type="text/javascript" src="stitchcode/objects.js?version=2022-08-25"></script>
+    <script type="text/javascript" src="stitchcode/objects.js?version=2022-08-25-"></script>
     <script type="text/javascript" src="stitchcode/turtlecloud.js?version=2022-06-14"></script>
-    <script type="text/javascript" src="stitchcode/gui.js?version=2022-08-05"></script>
+    <script type="text/javascript" src="stitchcode/gui.js?version=2022-08-25"></script>
     <script type="text/javascript" src="stitchcode/store.js?version=2022-06-14"></script>
 
     <script type="text/javascript">
diff --git a/stitchcode/objects.js b/stitchcode/objects.js
index 1e5b332b..a21aa051 100644
--- a/stitchcode/objects.js
+++ b/stitchcode/objects.js
@@ -504,9 +504,10 @@ SpriteMorph.prototype.arcRight = function (radius, degrees) {
           this.forward((radius * 0.174532) / (10.0 / (degrees % 10)))
           this.turn((degrees % 10)/2.0 ) 
       }
-    } else {
-      // throw new Error('degrees must be positive');
+    } else if (degrees < 0) {      
       this.arcLeft(radius, Math.abs(degrees))
+    } else {
+      throw new Error('degrees must not be zero');
     }
 };
 
@@ -523,9 +524,10 @@ SpriteMorph.prototype.arcLeft = function (radius, degrees) {
           this.forward((radius * 0.174532) / (10.0 / (degrees % 10)))
           this.turn(-((degrees % 10)/2.0)) 
       }
-    } else {
-      //throw new Error('degrees must be positive');
+    } else if (degrees < 0) {  
       this.arcRight(radius, Math.abs(degrees))
+    } else {
+      throw new Error('degrees must not be zero');
     }
 };