Initial commit

Library/PackageCache/com.unity.2d.animation@3.2.6/Runtime/Triangle/Topology/DCEL/Face.cs

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+// -----------------------------------------------------------------------
+// <copyright file="Face.cs">
+// Triangle.NET code by Christian Woltering, http://triangle.codeplex.com/
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace UnityEngine.U2D.Animation.TriangleNet
+    .Topology.DCEL
+{
+    using System.Collections.Generic;
+    using Animation.TriangleNet.Geometry;
+
+    /// <summary>
+    /// A face of DCEL mesh.
+    /// </summary>
+    internal class Face
+    {
+        #region Static initialization of "Outer Space" face
+
+        internal static readonly Face Empty;
+
+        static Face()
+        {
+            Empty = new Face(null);
+            Empty.id = -1;
+        }
+
+        #endregion
+
+        internal int id;
+        internal int mark = 0;
+
+        internal Point generator;
+
+        internal HalfEdge edge;
+        internal bool bounded;
+
+        /// <summary>
+        /// Gets or sets the face id.
+        /// </summary>
+        public int ID
+        {
+            get { return id; }
+            set { id = value; }
+        }
+
+        /// <summary>
+        /// Gets or sets a half-edge connected to the face.
+        /// </summary>
+        public HalfEdge Edge
+        {
+            get { return edge; }
+            set { edge = value; }
+        }
+
+        /// <summary>
+        /// Gets or sets a value, indicating if the face is bounded (for Voronoi diagram).
+        /// </summary>
+        public bool Bounded
+        {
+            get { return bounded; }
+            set { bounded = value; }
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Face" /> class.
+        /// </summary>
+        /// <param name="generator">The generator of this face (for Voronoi diagram)</param>
+        public Face(Point generator)
+            : this(generator, null)
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Face" /> class.
+        /// </summary>
+        /// <param name="generator">The generator of this face (for Voronoi diagram)</param>
+        /// <param name="edge">The half-edge connected to this face.</param>
+        public Face(Point generator, HalfEdge edge)
+        {
+            this.generator = generator;
+            this.edge = edge;
+            this.bounded = true;
+
+            if (generator != null)
+            {
+                this.id = generator.ID;
+            }
+        }
+
+        /// <summary>
+        /// Enumerates all half-edges of the face boundary.
+        /// </summary>
+        /// <returns></returns>
+        public IEnumerable<HalfEdge> EnumerateEdges()
+        {
+            var edge = this.Edge;
+            int first = edge.ID;
+
+            do
+            {
+                yield return edge;
+
+                edge = edge.Next;
+            }
+            while (edge.ID != first);
+        }
+
+        public override string ToString()
+        {
+            return string.Format("F-ID {0}", id);
+        }
+    }
+}