nknize commented on a change in pull request #771: LUCENE-8620: Update
Tessellator logic to label if triangle edges belongs to the original polygon
URL: https://github.com/apache/lucene-solr/pull/771#discussion_r321718297
##########
File path: lucene/sandbox/src/java/org/apache/lucene/geo/Tessellator.java
##########
@@ -590,14 +601,123 @@ private static final boolean splitEarcut(Object
polygon, final Node start, final
return false;
}
+ /** Computes if edge defined by a and b overlaps with a polygon edge **/
+ private static boolean edgeFromPolygon(final Node a, final Node b, final
boolean isMorton) {
+ if (isMorton) {
+ return mortonEdgeFromPolygon(a, b);
+ }
+ Node next = a;
+ do {
+ if (pointInLine(next, next.next, a) && pointInLine(next, next.next, b)) {
+ return next.nextEdgeFromPolygon;
+ }
+ if (pointInLine(next, next.previous, a) && pointInLine(next,
next.previous, b)) {
+ return next.previous.nextEdgeFromPolygon;
+ }
+ next = next.next;
+ } while(next != a);
+ return false;
+ }
+
+ /** Uses morton code for speed to determine whether or not and edge defined
by a and b overlaps with a polygon edge */
+ private static final boolean mortonEdgeFromPolygon(final Node a, final Node
b) {
Review comment:
```suggestion
private static final boolean isMortonEdgeFromPolygon(final Node a, final
Node b) {
```
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