Add get_neighbor

QTProject/triangle.cpp

+#include <cassert>
 #include <QDebugStateSaver>
 
 #include "triangle.h"
@@ -187,6 +188,19 @@ void ibToTriangles(QVector<Vertex> *vb, QVector<unsigned int> &ib, QVector<Trian
     }
 }
 
+Triangle::Neighbor Triangle::Neighbors::get_neighbor(Triangle::Edge::Name name) {
+    switch (name) {
+        case Triangle::Edge::Name::uv:
+            return this->uv;
+        case Triangle::Edge::Name::vw:
+            return this->vw;
+        case Triangle::Edge::Name::wu:
+            return this->wu;
+        default:
+            assert(false);
+    }
+}
+
 void insert_neighbor(QMap<Triangle, Triangle::Neighbors> &neighbors, const Triangle &triangle_a, const Triangle::Edge &edge_a, Triangle *triangle_b, const Triangle::Edge &edge_b) {
     if (!neighbors.contains(triangle_a)) {
         neighbors.insert(triangle_a, Triangle::Neighbors());

QTProject/triangle.h

@@ -30,6 +30,8 @@ class Triangle {
             Neighbor uv;
             Neighbor vw;
             Neighbor wu;
+
+            Triangle::Neighbor get_neighbor(Triangle::Edge::Name name);
         };
 
         Triangle();