1 files changed, 3 insertions, 3 deletions

diff --git a/src/morpher/quadrilateral.c b/src/morpher/quadrilateral.c
index b9e740b..9671116 100644
--- a/src/morpher/quadrilateral.c
+++ b/src/morpher/quadrilateral.c
@@ -6,7 +6,7 @@ static inline IntVector p2(IntVector n) {
   return n * n;
 }
 
-static inline bool in_circumcircle(TriangleMap *t, CartesianVector v) {
+static inline bool not_in_circumcircle(TriangleMap *t, CartesianVector v) {
   CartesianVector a = t->vertices[0].origin, b = t->vertices[1].origin, c = t->vertices[2].origin;
   IntVector v2 = p2(v.x) + p2(v.y);
   return matrix_int_det3(a.x - v.x, a.y - v.y, p2(a.x) + p2(a.y) - v2,
@@ -53,6 +53,6 @@ void quadrilateral_flip_diagonal(TriangleMap *t1, TriangleMap *t2) {
 }
 
 bool quadrilateral_is_delaunay(TriangleMap *t1, TriangleMap *t2) {
-  return in_circumcircle(t1, t2->vertices[(trianglemap_find_common_edge(t2, t1) + 2) % 3].origin) &&
-         in_circumcircle(t2, t1->vertices[(trianglemap_find_common_edge(t1, t2) + 2) % 3].origin);
+  return not_in_circumcircle(t1, t2->vertices[(trianglemap_find_common_edge(t2, t1) + 2) % 3].origin) &&
+         not_in_circumcircle(t2, t1->vertices[(trianglemap_find_common_edge(t1, t2) + 2) % 3].origin);
 }