Initial commit

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

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+// -----------------------------------------------------------------------
+// <copyright file="Triangle.cs" company="">
+// Original Triangle code by Jonathan Richard Shewchuk, http://www.cs.cmu.edu/~quake/triangle.html
+// Triangle.NET code by Christian Woltering, http://triangle.codeplex.com/
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace UnityEngine.U2D.Animation.TriangleNet
+    .Topology
+{
+    using System;
+    using Animation.TriangleNet.Geometry;
+
+    /// <summary>
+    /// The triangle data structure.
+    /// </summary>
+    internal class Triangle : ITriangle
+    {
+        // Hash for dictionary. Will be set by mesh instance.
+        internal int hash;
+
+        // The ID is only used for mesh output.
+        internal int id;
+
+        internal Otri[] neighbors;
+        internal Vertex[] vertices;
+        internal Osub[] subsegs;
+        internal int label;
+        internal double area;
+        internal bool infected;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Triangle" /> class.
+        /// </summary>
+        public Triangle()
+        {
+            // Three NULL vertices.
+            vertices = new Vertex[3];
+
+            // Initialize the three adjoining subsegments to be the omnipresent subsegment.
+            subsegs = new Osub[3];
+
+            // Initialize the three adjoining triangles to be "outer space".
+            neighbors = new Otri[3];
+
+            // area = -1.0;
+        }
+
+        #region Public properties
+
+        /// <summary>
+        /// Gets or sets the triangle id.
+        /// </summary>
+        public int ID
+        {
+            get { return this.id; }
+            set { this.id = value; }
+        }
+
+        /// <summary>
+        /// Region ID the triangle belongs to.
+        /// </summary>
+        public int Label
+        {
+            get { return this.label; }
+            set { this.label = value; }
+        }
+
+        /// <summary>
+        /// Gets the triangle area constraint.
+        /// </summary>
+        public double Area
+        {
+            get { return this.area; }
+            set { this.area = value; }
+        }
+
+        /// <summary>
+        /// Gets the specified corners vertex.
+        /// </summary>
+        public Vertex GetVertex(int index)
+        {
+            return this.vertices[index]; // TODO: Check range?
+        }
+
+        public int GetVertexID(int index)
+        {
+            return this.vertices[index].id;
+        }
+
+        /// <summary>
+        /// Gets a triangles' neighbor.
+        /// </summary>
+        /// <param name="index">The neighbor index (0, 1 or 2).</param>
+        /// <returns>The neigbbor opposite of vertex with given index.</returns>
+        public ITriangle GetNeighbor(int index)
+        {
+            return neighbors[index].tri.hash == Mesh.DUMMY ? null : neighbors[index].tri;
+        }
+
+        /// <inheritdoc />
+        public int GetNeighborID(int index)
+        {
+            return neighbors[index].tri.hash == Mesh.DUMMY ? -1 : neighbors[index].tri.id;
+        }
+
+        /// <summary>
+        /// Gets a triangles segment.
+        /// </summary>
+        /// <param name="index">The vertex index (0, 1 or 2).</param>
+        /// <returns>The segment opposite of vertex with given index.</returns>
+        public ISegment GetSegment(int index)
+        {
+            return subsegs[index].seg.hash == Mesh.DUMMY ? null : subsegs[index].seg;
+        }
+
+        #endregion
+
+        public override int GetHashCode()
+        {
+            return this.hash;
+        }
+
+        public override string ToString()
+        {
+            return String.Format("TID {0}", hash);
+        }
+    }
+}