C# Otri.Bond方法代码示例

        /// <summary>
        /// Delete a vertex from a Delaunay triangulation, ensuring that the 
        /// triangulation remains Delaunay.
        /// </summary>
        /// <param name="deltri"></param>
        /// <remarks>The origin of 'deltri' is deleted. The union of the triangles 
        /// adjacent to this vertex is a polygon, for which the Delaunay triangulation 
        /// is found. Two triangles are removed from the mesh.
        ///
        /// Only interior vertices that do not lie on segments or boundaries 
        /// may be deleted.
        /// </remarks>
        internal void DeleteVertex(ref Otri deltri)
        {
            Otri countingtri = default(Otri);
            Otri firstedge = default(Otri), lastedge = default(Otri);
            Otri deltriright = default(Otri);
            Otri lefttri = default(Otri), righttri = default(Otri);
            Otri leftcasing = default(Otri), rightcasing = default(Otri);
            Osub leftsubseg = default(Osub), rightsubseg = default(Osub);
            Vertex delvertex;
            Vertex neworg;
            int edgecount;

            delvertex = deltri.Org();

            VertexDealloc(delvertex);

            // Count the degree of the vertex being deleted.
            deltri.Onext(ref countingtri);
            edgecount = 1;
            while (!deltri.Equal(countingtri))
            {
                edgecount++;
                countingtri.OnextSelf();
            }

            if (edgecount > 3)
            {
                // Triangulate the polygon defined by the union of all triangles
                // adjacent to the vertex being deleted.  Check the quality of
                // the resulting triangles.
                deltri.Onext(ref firstedge);
                deltri.Oprev(ref lastedge);
                TriangulatePolygon(firstedge, lastedge, edgecount, false, behavior.NoBisect == 0);
            }
            // Splice out two triangles.
            deltri.Lprev(ref deltriright);
            deltri.Dnext(ref lefttri);
            lefttri.Sym(ref leftcasing);
            deltriright.Oprev(ref righttri);
            righttri.Sym(ref rightcasing);
            deltri.Bond(ref leftcasing);
            deltriright.Bond(ref rightcasing);
            lefttri.SegPivot(ref leftsubseg);
            if (leftsubseg.seg != Mesh.dummysub)
            {
                deltri.SegBond(ref leftsubseg);
            }
            righttri.SegPivot(ref rightsubseg);
            if (rightsubseg.seg != Mesh.dummysub)
            {
                deltriright.SegBond(ref rightsubseg);
            }

            // Set the new origin of 'deltri' and check its quality.
            neworg = lefttri.Org();
            deltri.SetOrg(neworg);
            if (behavior.NoBisect == 0)
            {
                quality.TestTriangle(ref deltri);
            }

            // Delete the two spliced-out triangles.
            TriangleDealloc(lefttri.triangle);
            TriangleDealloc(righttri.triangle);
        }

        /// <summary>
        /// Recursively form a Delaunay triangulation by the divide-and-conquer method.
        /// </summary>
        /// <param name="left"></param>
        /// <param name="right"></param>
        /// <param name="axis"></param>
        /// <param name="farleft"></param>
        /// <param name="farright"></param>
        /// <remarks>
        /// Recursively breaks down the problem into smaller pieces, which are
        /// knitted together by mergehulls(). The base cases (problems of two or
        /// three vertices) are handled specially here.
        ///
        /// On completion, 'farleft' and 'farright' are bounding triangles such that
        /// the origin of 'farleft' is the leftmost vertex (breaking ties by
        /// choosing the highest leftmost vertex), and the destination of
        /// 'farright' is the rightmost vertex (breaking ties by choosing the
        /// lowest rightmost vertex).
        /// </remarks>
        void DivconqRecurse(int left, int right, int axis,
                            ref Otri farleft, ref Otri farright)
        {
            Otri midtri = default(Otri);
            Otri tri1 = default(Otri);
            Otri tri2 = default(Otri);
            Otri tri3 = default(Otri);
            Otri innerleft = default(Otri), innerright = default(Otri);
            double area;
            int vertices = right - left + 1;
            int divider;

            if (vertices == 2)
            {
                // The triangulation of two vertices is an edge.  An edge is
                // represented by two bounding triangles.
                mesh.MakeTriangle(ref farleft);
                farleft.SetOrg(sortarray[left]);
                farleft.SetDest(sortarray[left + 1]);
                // The apex is intentionally left NULL.
                mesh.MakeTriangle(ref farright);
                farright.SetOrg(sortarray[left + 1]);
                farright.SetDest(sortarray[left]);
                // The apex is intentionally left NULL.
                farleft.Bond(ref farright);
                farleft.LprevSelf();
                farright.LnextSelf();
                farleft.Bond(ref farright);
                farleft.LprevSelf();
                farright.LnextSelf();
                farleft.Bond(ref farright);

                // Ensure that the origin of 'farleft' is sortarray[0].
                farright.Lprev(ref farleft);
                return;
            }
            else if (vertices == 3)
            {
                // The triangulation of three vertices is either a triangle (with
                // three bounding triangles) or two edges (with four bounding
                // triangles).  In either case, four triangles are created.
                mesh.MakeTriangle(ref midtri);
                mesh.MakeTriangle(ref tri1);
                mesh.MakeTriangle(ref tri2);
                mesh.MakeTriangle(ref tri3);
                area = Primitives.CounterClockwise(sortarray[left], sortarray[left + 1], sortarray[left + 2]);
                if (area == 0.0)
                {
                    // Three collinear vertices; the triangulation is two edges.
                    midtri.SetOrg(sortarray[left]);
                    midtri.SetDest(sortarray[left + 1]);
                    tri1.SetOrg(sortarray[left + 1]);
                    tri1.SetDest(sortarray[left]);
                    tri2.SetOrg(sortarray[left + 2]);
                    tri2.SetDest(sortarray[left + 1]);
                    tri3.SetOrg(sortarray[left + 1]);
                    tri3.SetDest(sortarray[left + 2]);
                    // All apices are intentionally left NULL.
                    midtri.Bond(ref tri1);
                    tri2.Bond(ref tri3);
                    midtri.LnextSelf();
                    tri1.LprevSelf();
                    tri2.LnextSelf();
                    tri3.LprevSelf();
                    midtri.Bond(ref tri3);
                    tri1.Bond(ref tri2);
                    midtri.LnextSelf();
                    tri1.LprevSelf();
                    tri2.LnextSelf();
                    tri3.LprevSelf();
                    midtri.Bond(ref tri1);
                    tri2.Bond(ref tri3);
                    // Ensure that the origin of 'farleft' is sortarray[0].
                    tri1.Copy(ref farleft);
                    // Ensure that the destination of 'farright' is sortarray[2].
                    tri2.Copy(ref farright);
                }
                else
                {
                    // The three vertices are not collinear; the triangulation is one
                    // triangle, namely 'midtri'.
//.........这里部分代码省略.........