Tweak this function for choosing where to place a label in depictions. If there are equally good places to place we prefer that which is pointing left/right.

johnmay · johnmay · commit a895a09535b3 · 2021-05-04T15:22:25.000+01:00
diff --git a/display/renderbasic/src/main/java/org/openscience/cdk/renderer/generators/standard/VecmathUtil.java b/display/renderbasic/src/main/java/org/openscience/cdk/renderer/generators/standard/VecmathUtil.java
@@ -338,7 +338,15 @@ static Vector2d newVectorInLargestGap(final List<Vector2d> vectors) {
         for (int i = 0; i < vectors.size(); i++) {
             double extent = extents[(i + 1) % vectors.size()] - extents[i];
             if (extent < 0) extent += TAU;
-            if (extent > max) {
+            double delta = extent - max;
+            // is significantly better?
+            if (delta > 0.01) {
+                max = extent;
+                index = i;
+            }
+            // not significantly better -> put is left/right aligned
+            else if ((extents[i] < TAU && extents[i]+extent > TAU) ||
+                       (extents[i] < Math.PI && extents[i]+extent > Math.PI)) {
                 max = extent;
                 index = i;
             }
