X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fschemes%2FAnnotationColourGradient.java;h=c74fdbc62f83ce0dd089217dd817b08685d37483;hb=424648b2e57e45eaa21c006b44828d8fca418581;hp=c28ea5f7dd727fd6f1af5948a7dd1122f7d7a762;hpb=3d0101179759ef157b088ea135423cd909512d9f;p=jalview.git

diff --git a/src/jalview/schemes/AnnotationColourGradient.java b/src/jalview/schemes/AnnotationColourGradient.java
index c28ea5f..c74fdbc 100755
--- a/src/jalview/schemes/AnnotationColourGradient.java
+++ b/src/jalview/schemes/AnnotationColourGradient.java
@@ -185,7 +185,7 @@ public class AnnotationColourGradient extends FollowerColourScheme
       }
       else
       {
-        seqannot = new IdentityHashMap<SequenceI, AlignmentAnnotation>();
+        seqannot = new IdentityHashMap<>();
       }
       // resolve the context containing all the annotation for the sequence
       AnnotatedCollectionI alcontext = alignment instanceof AlignmentI
@@ -414,14 +414,17 @@ public class AnnotationColourGradient extends FollowerColourScheme
             && aboveAnnotationThreshold == ABOVE_THRESHOLD
             && value >= ann.threshold.value)
     {
-      range = (value - ann.threshold.value)
+      range = ann.graphMax == ann.threshold.value ? 1f
+              : (value - ann.threshold.value)
               / (ann.graphMax - ann.threshold.value);
     }
     else if (thresholdIsMinMax && ann.threshold != null
             && aboveAnnotationThreshold == BELOW_THRESHOLD
             && value <= ann.threshold.value)
     {
-      range = (value - ann.graphMin) / (ann.threshold.value - ann.graphMin);
+      range = ann.graphMin == ann.threshold.value ? 0f
+              : (value - ann.graphMin)
+                      / (ann.threshold.value - ann.graphMin);
     }
     else
     {