From: Jim Procter <j.procter@dundee.ac.uk>
Date: Thu, 20 Oct 2022 15:45:16 +0000 (+0100)
Subject: JAL-2349 avoid div-by-zero when annotation height is zero (though poss better to... 
X-Git-Tag: Release_2_11_4_0~528
X-Git-Url: http://source.jalview.org/gitweb/?a=commitdiff_plain;h=ec1ed55ce0f333f55d400ee5f25b88454a7fe0ba;p=jalview.git

JAL-2349 avoid div-by-zero when annotation height is zero (though poss better to simply avoid rendering contact at all)
---

diff --git a/src/jalview/renderer/ContactGeometry.java b/src/jalview/renderer/ContactGeometry.java
index 0e5107a..52581fb 100644
--- a/src/jalview/renderer/ContactGeometry.java
+++ b/src/jalview/renderer/ContactGeometry.java
@@ -16,7 +16,8 @@ public class ContactGeometry
   {
     contact_height = contacts.getContactHeight();
     // fractional number of contacts covering each pixel
-    contacts_per_pixel = ((double) contact_height) / ((double) graphHeight);
+    contacts_per_pixel = (graphHeight < 1) ? contact_height
+            : ((double) contact_height) / ((double) graphHeight);
 
     if (contacts_per_pixel >= 1)
     {