jpountz commented on a change in pull request #652: LUCENE-8775: Tessellator:
Improve the election of diagonals when splitting the polygon
URL: https://github.com/apache/lucene-solr/pull/652#discussion_r278996888
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File path: lucene/sandbox/src/java/org/apache/lucene/geo/Tessellator.java
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@@ -163,7 +163,19 @@ private static final Node eliminateHoles(final Polygon
polygon, Node outerNode)
// Sort the hole vertices by x coordinate
holeList.sort((Node pNodeA, Node pNodeB) ->
- pNodeA.getX() < pNodeB.getX() ? -1 : pNodeA.getX() == pNodeB.getX() ?
0 : 1);
+ {
+ double diff = pNodeA.getX() - pNodeB.getX();
+ if (diff == 0) {
+ diff = pNodeA.getY() - pNodeB.getY();
+ if (diff == 0) {
+ //same hole node
+ double a = Math.min(pNodeA.previous.getY(), pNodeA.next.getY());
+ double b = Math.min(pNodeB.previous.getY(), pNodeB.next.getY());
+ diff = a - b;
+ }
Review comment:
Why do we need to look at previous and next nodes? Is it for the case that a
vertex is shared by multiple holes, or by a hole and the enclosing polygon?
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