fix race condition that produced broken triangulation

closes #13
mapbox · Aug 31, 2018 · b1f360c · b1f360c
1 parent 3a61ecc
commit b1f360c
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Showing 2 changed files with 53 additions and 24 deletions.
diff --git a/index.js b/index.js
@@ -246,6 +246,8 @@ export default class Delaunator {
         const ar = a0 + (a + 2) % 3;
         const bl = b0 + (b + 2) % 3;
 
+        if (b === -1) return ar;
+
         const p0 = triangles[ar];
         const pr = triangles[a];
         const pl = triangles[al];