docs/attachments/LUCENE-8534/LUCENE-8534.patch

Index: lucene/sandbox/src/java/org/apache/lucene/geo/Tessellator.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- lucene/sandbox/src/java/org/apache/lucene/geo/Tessellator.java	(revision ed8a395948f406aca7ac55fd3bd0f5348af353c3)
+++ lucene/sandbox/src/java/org/apache/lucene/geo/Tessellator.java	(date 1540480536000)
@@ -422,6 +422,7 @@
 
       // a self-intersection where edge (v[i-1],v[i]) intersects (v[i+1],v[i+2])
       if (isVertexEquals(a, b) == false
+          && isIntersectingPolygon(a, a.getX(), a.getY(), b.getX(), b.getY()) == false
           && linesIntersect(a.getX(), a.getY(), node.getX(), node.getY(), nextNode.getX(), nextNode.getY(), b.getX(), b.getY())
           && isLocallyInside(a, b) && isLocallyInside(b, a)) {
         // Return the triangulated vertices to the tessellation
@@ -454,6 +455,10 @@
           searchNode = filterPoints(searchNode, searchNode.next);
           splitNode  = filterPoints(splitNode, splitNode.next);
           // Attempt to earcut both of the resulting polygons
+          if (mortonIndexed) {
+            sortByMortonWithReset(searchNode);
+            sortByMortonWithReset(splitNode);
+          }
           earcutLinkedList(searchNode, tessellation, State.INIT, mortonIndexed);
           earcutLinkedList(splitNode,  tessellation, State.INIT, mortonIndexed);
           // Finish the iterative search
@@ -538,7 +543,9 @@
       if(node.getX() != x0 && node.getY() != y0 && nextNode.getX() != x0
           && nextNode.getY() != y0 && node.getX() != x1 && node.getY() != y1
           && nextNode.getX() != x1 && nextNode.getY() != y1) {
-        return linesIntersect(node.getX(), node.getY(), nextNode.getX(), nextNode.getY(), x0, y0, x1, y1);
+        if (linesIntersect(node.getX(), node.getY(), nextNode.getX(), nextNode.getY(), x0, y0, x1, y1)) {
+          return true;
+        }
       }
       node = nextNode;
     } while (node != start);
@@ -553,6 +560,17 @@
         && (area(bX0, bY0, bX1, bY1, aX0, aY0) > 0) != (area(bX0, bY0, bX1, bY1, aX1, aY1) > 0);
   }
 
+  /** Interlinks polygon nodes in Z-Order. It reset the values on the z values**/
+  private static final void sortByMortonWithReset(Node start) {
+    Node next = start;
+    do {
+      next.previousZ = next.previous;
+      next.nextZ = next.next;
+      next = next.next;
+    } while (next != start);
+    sortByMorton(start);
+  }
+
   /** Interlinks polygon nodes in Z-Order. **/
   private static final void sortByMorton(Node start) {
     start.previousZ.nextZ = null;
Index: lucene/sandbox/src/test/org/apache/lucene/geo/TestTessellator.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- lucene/sandbox/src/test/org/apache/lucene/geo/TestTessellator.java	(revision ed8a395948f406aca7ac55fd3bd0f5348af353c3)
+++ lucene/sandbox/src/test/org/apache/lucene/geo/TestTessellator.java	(date 1540478017000)
@@ -64,4 +64,24 @@
     List<Tessellator.Triangle> result = Tessellator.tessellate(polygons[0]);
     assertEquals(result.size(), 84);
   }
+
+  public void testLUCENE8534() throws ParseException {
+    String geoJson = "{\"type\":\"Polygon\",\"coordinates\":[[[168.412605,-32.061828],[168.41260500337557,-32.06164814731918],[168.263154,-32.061754],[168.263074,-31.795333],[168.2631866330167,-31.79533292075007],[168.26293615809584,-31.55183198959802],[168.26271862830876,-31.55183199836296]," +
+        "[168.26260885857246,-31.79551898342183],[168.262799,-31.795519],[168.262922,-32.061969],[168.113391,-32.061955],[168.1136947020627,-31.797506925167987],[168.1134623401242,-31.7975067304478],[168.112867,-32.061933],[167.96342,-32.061572],[167.964447,-31.795078],[167.96462554945853,-31.79507843013861]," +
+        "[167.96521264500555,-31.551376165945904],[167.965145,-31.551376],[167.9663078329189,-31.287013079577566],[167.966251,-31.287013],[167.9664724470441,-31.186852765132446],[167.966135,-31.286996],[167.96583002270634,-31.28699509215832],[167.96514242732414,-31.530648904745615],[167.96518,-31.530649]," +
+        "[167.964244373485,-31.795342905910022],[167.964267,-31.795343],[167.963051,-32.06191],[167.813527,-32.061286],[167.81515841152935,-31.796764131690956],[167.815107,-31.796764],[167.8163675951437,-31.55101526478777],[167.81635023954297,-31.551015225373174],[167.814827,-31.796834]," +
+        "[167.81479823247224,-31.796833898826222],[167.813495,-32.061159],[167.664068,-32.060513],[167.66581,-31.794011],[167.6658519100183,-31.794011179736117],[167.6677495759609,-31.550438401064135],[167.667432,-31.550437],[167.66930180157829,-31.286073839134556],[167.669105,-31.286073],[167.670807,-31.019532]," +
+        "[167.818843,-31.020159],[167.8175723936035,-31.284543327213736],[167.81766095836642,-31.284543526532044],[167.818971,-31.020062],[167.967033,-31.020499],[167.96703262843647,-31.020609267886275],[168.114968,-31.020815],[168.1149445990616,-31.05814524188174],[168.114978,-31.020912],[168.26306,-31.021035]," +
+        "[168.2631849793437,-31.203987591682104],[168.263163,-31.021002],[168.411259,-31.020914],[168.41125954741193,-31.02123593258559],[168.5589863328454,-31.020786105561243],[168.558986,-31.020705],[168.707027,-31.020199],[168.70828992266655,-31.242361611483734],[168.707298,-31.020426],[168.855538,-31.019789]," +
+        "[168.85713808565947,-31.284233200286536],[168.857209,-31.284233],[168.8583969293829,-31.54547348363567],[168.86057,-31.796021],[168.86004803213373,-31.796023826818654],[168.862202,-32.060514],[168.712722,-32.061376],[168.71099229524427,-31.796760977737968],[168.7108263042178,-31.79676167516991],[168.712468,-32.061301]," +
+        "[168.56291,-32.061787],[168.561684,-31.795261],[168.56198761104602,-31.795260018704994],[168.560821,-31.530975],[168.56092374559077,-31.530974570518158],[168.56001677082173,-31.287057906497665],[168.5597021283975,-31.287058866102726],[168.5607530382453,-31.530880020491022],[168.560769,-31.53088]," +
+        "[168.56079128925168,-31.539754620482725],[168.560842,-31.55152],[168.56082083893278,-31.551520031401303],[168.56143311036655,-31.7953001584517],[168.561622,-31.7953],[168.562045,-32.0617],[168.412605,-32.061828]]," +
+        "[[168.41212499436773,-31.68171617103951],[168.41200593405762,-31.551740860609502],[168.411912,-31.551741],[168.41154546767467,-31.416898111348704],[168.41158059852074,-31.53102923335134],[168.411729,-31.531029],[168.41212499436773,-31.68171617103951]]," +
+        "[[168.7083938476212,-31.28652950649234],[168.70945084576658,-31.485690997091577],[168.70886199577689,-31.28667838236468],[168.708488,-31.28668],[168.7084873259438,-31.28652918474386],[168.7083938476212,-31.28652950649234]]," +
+        "[[168.71121460687698,-31.795031659971823],[168.71136127361123,-31.79503081865431],[168.71038567290682,-31.657182838382653],[168.71121460687698,-31.795031659971823]]," +
+        "[[167.81624041598312,-31.53023516975434],[167.81634270442586,-31.530235525706665],[167.81676369867318,-31.434841665952604],[167.81624041598312,-31.53023516975434]]]}";
+    Polygon[] polygons =Polygon.fromGeoJSON(geoJson);
+    List<Tessellator.Triangle> result = Tessellator.tessellate(polygons[0]);
+    assertEquals(113, result.size());
+  }
 }
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