before candybox editor update

Plugins/CandyboxPlugin/Voronoi/Delaunay.cs

@@ -0,0 +1,79 @@
+namespace CandyboxPlugin.Voronoi
+{
+    public class DelaunayTriangulator
+    {
+        private double MaxX { get; set; }
+        private double MaxY { get; set; }
+        private IEnumerable<Triangle> border;
+        public void GenerateBorder(double maxX, double maxY)
+        {
+            MaxX = maxX;
+            MaxY = maxY;
+
+            // TODO make more beautiful
+            var point0 = new VoronoiPoint(0, 0);
+            var point1 = new VoronoiPoint(0, MaxY);
+            var point2 = new VoronoiPoint(MaxX, MaxY);
+            var point3 = new VoronoiPoint(MaxX, 0);
+            var points = new List<VoronoiPoint>() { point0, point1, point2, point3 };
+            var tri1 = new Triangle(point0, point1, point2);
+            var tri2 = new Triangle(point0, point2, point3);
+            border = new List<Triangle>() { tri1, tri2 };
+
+   
+        }
+
+        public IEnumerable<Triangle> BowyerWatson(IEnumerable<VoronoiPoint> points)
+        {
+            //var supraTriangle = GenerateSupraTriangle();
+            var triangulation = new HashSet<Triangle>(border);
+
+            foreach (var point in points)
+            {
+                var badTriangles = FindBadTriangles(point, triangulation);
+                var polygon = FindHoleBoundaries(badTriangles);
+
+                foreach (var triangle in badTriangles)
+                {
+                    foreach (var vertex in triangle.Vertices)
+                    {
+                        vertex.AdjacentTriangles.Remove(triangle);
+                    }
+                }
+                triangulation.RemoveWhere(o => badTriangles.Contains(o));
+
+                foreach (var edge in polygon.Where(possibleEdge => possibleEdge.Point1 != point && possibleEdge.Point2 != point))
+                {
+                    
+                    var triangle = new Triangle(point, edge.Point1, edge.Point2);
+                    triangulation.Add(triangle);
+                }
+            }
+
+            
+            return triangulation;
+        }
+
+        private List<Edge> FindHoleBoundaries(ISet<Triangle> badTriangles)
+        {
+            var edges = new List<Edge>();
+            foreach (var triangle in badTriangles)
+            {
+                edges.Add(new Edge(triangle.Vertices[0], triangle.Vertices[1]));
+                edges.Add(new Edge(triangle.Vertices[1], triangle.Vertices[2]));
+                edges.Add(new Edge(triangle.Vertices[2], triangle.Vertices[0]));
+            }
+            var grouped = edges.GroupBy(o => o);
+            var boundaryEdges = edges.GroupBy(o => o).Where(o => o.Count() == 1).Select(o => o.First());
+            return boundaryEdges.ToList();
+        }
+
+
+
+        private ISet<Triangle> FindBadTriangles(VoronoiPoint point, HashSet<Triangle> triangles)
+        {
+            var badTriangles = triangles.Where(o => o.IsPointInsideCircumcircle(point));
+            return new HashSet<Triangle>(badTriangles);
+        }
+    }
+}