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