public void TestBond()
{
Otri s = default;
Otri t = default;
Otri tmp = default;
s.tri = Helper.CreateTriangle(0, vertices[0], vertices[1], vertices[3]);
t.tri = Helper.CreateTriangle(1, vertices[1], vertices[4], vertices[3]);
s.orient = 1; // Edge 1 -> 3.
t.orient = 2; // Edge 3 -> 1.
// Make sure we're on the correct edges.
Assert.AreEqual(1, s.Org().ID);
Assert.AreEqual(3, s.Dest().ID);
Assert.AreEqual(3, t.Org().ID);
Assert.AreEqual(1, t.Dest().ID);
// Check that the triangles don't have neighbors.
s.Sym(ref tmp);
//Assert.AreEqual(-1, tmp.tri.ID);
Assert.IsNull(tmp.tri);
t.Sym(ref tmp);
//Assert.AreEqual(-1, tmp.tri.ID);
Assert.IsNull(tmp.tri);
// Bond the two triangles.
s.Bond(ref t);
// Check that neighbors are properly set.
s.Sym(ref tmp);
Assert.AreEqual(1, tmp.tri.ID);
t.Sym(ref tmp);
Assert.AreEqual(0, tmp.tri.ID);
}
/// <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'.
midtri.SetOrg(sortarray[left]);
tri1.SetDest(sortarray[left]);
tri3.SetOrg(sortarray[left]);
// Apices of tri1, tri2, and tri3 are left NULL.
if (area > 0.0)
{
// The vertices are in counterclockwise order.
midtri.SetDest(sortarray[left + 1]);
tri1.SetOrg(sortarray[left + 1]);
tri2.SetDest(sortarray[left + 1]);
midtri.SetApex(sortarray[left + 2]);
tri2.SetOrg(sortarray[left + 2]);
tri3.SetDest(sortarray[left + 2]);
}
else
{
// The vertices are in clockwise order.
midtri.SetDest(sortarray[left + 2]);
tri1.SetOrg(sortarray[left + 2]);
tri2.SetDest(sortarray[left + 2]);
midtri.SetApex(sortarray[left + 1]);
tri2.SetOrg(sortarray[left + 1]);
tri3.SetDest(sortarray[left + 1]);
}
// The topology does not depend on how the vertices are ordered.
midtri.Bond(ref tri1);
midtri.LnextSelf();
midtri.Bond(ref tri2);
midtri.LnextSelf();
midtri.Bond(ref tri3);
tri1.LprevSelf();
tri2.LnextSelf();
tri1.Bond(ref tri2);
tri1.LprevSelf();
tri3.LprevSelf();
tri1.Bond(ref tri3);
tri2.LnextSelf();
tri3.LprevSelf();
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].
if (area > 0.0)
{
tri2.Copy(ref farright);
}
else
{
farleft.Lnext(ref farright);
}
}
return;
}
else
{
// Split the vertices in half.
divider = vertices >> 1;
// Recursively triangulate each half.
DivconqRecurse(left, left + divider - 1, 1 - axis, ref farleft, ref innerleft);
//DebugWriter.Session.Write(mesh, true);
DivconqRecurse(left + divider, right, 1 - axis, ref innerright, ref farright);
//DebugWriter.Session.Write(mesh, true);
// Merge the two triangulations into one.
MergeHulls(ref farleft, ref innerleft, ref innerright, ref farright, axis);
//DebugWriter.Session.Write(mesh, true);
}
}
/// <summary>
/// Merge two adjacent Delaunay triangulations into a single Delaunay triangulation.
/// </summary>
/// <param name="farleft">Bounding triangles of the left triangulation.</param>
/// <param name="innerleft">Bounding triangles of the left triangulation.</param>
/// <param name="innerright">Bounding triangles of the right triangulation.</param>
/// <param name="farright">Bounding triangles of the right triangulation.</param>
/// <param name="axis"></param>
/// <remarks>
/// This is similar to the algorithm given by Guibas and Stolfi, but uses
/// a triangle-based, rather than edge-based, data structure.
///
/// The algorithm walks up the gap between the two triangulations, knitting
/// them together. As they are merged, some of their bounding triangles
/// are converted into real triangles of the triangulation. The procedure
/// pulls each hull's bounding triangles apart, then knits them together
/// like the teeth of two gears. The Delaunay property determines, at each
/// step, whether the next "tooth" is a bounding triangle of the left hull
/// or the right. When a bounding triangle becomes real, its apex is
/// changed from NULL to a real vertex.
///
/// Only two new triangles need to be allocated. These become new bounding
/// triangles at the top and bottom of the seam. They are used to connect
/// the remaining bounding triangles (those that have not been converted
/// into real triangles) into a single fan.
///
/// On entry, 'farleft' and 'innerleft' are bounding triangles of the left
/// triangulation. The origin of 'farleft' is the leftmost vertex, and
/// the destination of 'innerleft' is the rightmost vertex of the
/// triangulation. Similarly, 'innerright' and 'farright' are bounding
/// triangles of the right triangulation. The origin of 'innerright' and
/// destination of 'farright' are the leftmost and rightmost vertices.
///
/// On completion, the origin of 'farleft' is the leftmost vertex of the
/// merged triangulation, and the destination of 'farright' is the rightmost
/// vertex.
/// </remarks>
void MergeHulls(ref Otri farleft, ref Otri innerleft, ref Otri innerright,
ref Otri farright, int axis)
{
Otri leftcand = default(Otri), rightcand = default(Otri);
Otri nextedge = default(Otri);
Otri sidecasing = default(Otri), topcasing = default(Otri), outercasing = default(Otri);
Otri checkedge = default(Otri);
Otri baseedge = default(Otri);
Vertex innerleftdest;
Vertex innerrightorg;
Vertex innerleftapex, innerrightapex;
Vertex farleftpt, farrightpt;
Vertex farleftapex, farrightapex;
Vertex lowerleft, lowerright;
Vertex upperleft, upperright;
Vertex nextapex;
Vertex checkvertex;
bool changemade;
bool badedge;
bool leftfinished, rightfinished;
innerleftdest = innerleft.Dest();
innerleftapex = innerleft.Apex();
innerrightorg = innerright.Org();
innerrightapex = innerright.Apex();
// Special treatment for horizontal cuts.
if (useDwyer && (axis == 1))
{
farleftpt = farleft.Org();
farleftapex = farleft.Apex();
farrightpt = farright.Dest();
farrightapex = farright.Apex();
// The pointers to the extremal vertices are shifted to point to the
// topmost and bottommost vertex of each hull, rather than the
// leftmost and rightmost vertices.
while (farleftapex.y < farleftpt.y)
{
farleft.LnextSelf();
farleft.SymSelf();
farleftpt = farleftapex;
farleftapex = farleft.Apex();
}
innerleft.Sym(ref checkedge);
checkvertex = checkedge.Apex();
while (checkvertex.y > innerleftdest.y)
{
checkedge.Lnext(ref innerleft);
innerleftapex = innerleftdest;
innerleftdest = checkvertex;
innerleft.Sym(ref checkedge);
checkvertex = checkedge.Apex();
}
while (innerrightapex.y < innerrightorg.y)
{
innerright.LnextSelf();
innerright.SymSelf();
innerrightorg = innerrightapex;
innerrightapex = innerright.Apex();
}
farright.Sym(ref checkedge);
checkvertex = checkedge.Apex();
while (checkvertex.y > farrightpt.y)
{
checkedge.Lnext(ref farright);
farrightapex = farrightpt;
farrightpt = checkvertex;
farright.Sym(ref checkedge);
checkvertex = checkedge.Apex();
}
}
// Find a line tangent to and below both hulls.
do
{
changemade = false;
// Make innerleftdest the "bottommost" vertex of the left hull.
if (Primitives.CounterClockwise(innerleftdest, innerleftapex, innerrightorg) > 0.0)
{
innerleft.LprevSelf();
innerleft.SymSelf();
innerleftdest = innerleftapex;
innerleftapex = innerleft.Apex();
changemade = true;
}
// Make innerrightorg the "bottommost" vertex of the right hull.
if (Primitives.CounterClockwise(innerrightapex, innerrightorg, innerleftdest) > 0.0)
{
innerright.LnextSelf();
innerright.SymSelf();
innerrightorg = innerrightapex;
innerrightapex = innerright.Apex();
changemade = true;
}
} while (changemade);
// Find the two candidates to be the next "gear tooth."
innerleft.Sym(ref leftcand);
innerright.Sym(ref rightcand);
// Create the bottom new bounding triangle.
mesh.MakeTriangle(ref baseedge);
// Connect it to the bounding boxes of the left and right triangulations.
baseedge.Bond(ref innerleft);
baseedge.LnextSelf();
baseedge.Bond(ref innerright);
baseedge.LnextSelf();
baseedge.SetOrg(innerrightorg);
baseedge.SetDest(innerleftdest);
// Apex is intentionally left NULL.
// Fix the extreme triangles if necessary.
farleftpt = farleft.Org();
if (innerleftdest == farleftpt)
{
baseedge.Lnext(ref farleft);
}
farrightpt = farright.Dest();
if (innerrightorg == farrightpt)
{
baseedge.Lprev(ref farright);
}
// The vertices of the current knitting edge.
lowerleft = innerleftdest;
lowerright = innerrightorg;
// The candidate vertices for knitting.
upperleft = leftcand.Apex();
upperright = rightcand.Apex();
// Walk up the gap between the two triangulations, knitting them together.
while (true)
{
// Have we reached the top? (This isn't quite the right question,
// because even though the left triangulation might seem finished now,
// moving up on the right triangulation might reveal a new vertex of
// the left triangulation. And vice-versa.)
leftfinished = Primitives.CounterClockwise(upperleft, lowerleft, lowerright) <= 0.0;
rightfinished = Primitives.CounterClockwise(upperright, lowerleft, lowerright) <= 0.0;
if (leftfinished && rightfinished)
{
// Create the top new bounding triangle.
mesh.MakeTriangle(ref nextedge);
nextedge.SetOrg(lowerleft);
nextedge.SetDest(lowerright);
// Apex is intentionally left NULL.
// Connect it to the bounding boxes of the two triangulations.
nextedge.Bond(ref baseedge);
nextedge.LnextSelf();
nextedge.Bond(ref rightcand);
nextedge.LnextSelf();
nextedge.Bond(ref leftcand);
// Special treatment for horizontal cuts.
if (useDwyer && (axis == 1))
{
farleftpt = farleft.Org();
farleftapex = farleft.Apex();
farrightpt = farright.Dest();
farrightapex = farright.Apex();
farleft.Sym(ref checkedge);
checkvertex = checkedge.Apex();
// The pointers to the extremal vertices are restored to the
// leftmost and rightmost vertices (rather than topmost and
// bottommost).
while (checkvertex.x < farleftpt.x)
{
checkedge.Lprev(ref farleft);
farleftapex = farleftpt;
farleftpt = checkvertex;
farleft.Sym(ref checkedge);
checkvertex = checkedge.Apex();
}
while (farrightapex.x > farrightpt.x)
{
farright.LprevSelf();
farright.SymSelf();
farrightpt = farrightapex;
farrightapex = farright.Apex();
}
}
return;
}
// Consider eliminating edges from the left triangulation.
if (!leftfinished)
{
// What vertex would be exposed if an edge were deleted?
leftcand.Lprev(ref nextedge);
nextedge.SymSelf();
nextapex = nextedge.Apex();
// If nextapex is NULL, then no vertex would be exposed; the
// triangulation would have been eaten right through.
if (nextapex != null)
{
// Check whether the edge is Delaunay.
badedge = Primitives.InCircle(lowerleft, lowerright, upperleft, nextapex) > 0.0;
while (badedge)
{
// Eliminate the edge with an edge flip. As a result, the
// left triangulation will have one more boundary triangle.
nextedge.LnextSelf();
nextedge.Sym(ref topcasing);
nextedge.LnextSelf();
nextedge.Sym(ref sidecasing);
nextedge.Bond(ref topcasing);
leftcand.Bond(ref sidecasing);
leftcand.LnextSelf();
leftcand.Sym(ref outercasing);
nextedge.LprevSelf();
nextedge.Bond(ref outercasing);
// Correct the vertices to reflect the edge flip.
leftcand.SetOrg(lowerleft);
leftcand.SetDest(null);
leftcand.SetApex(nextapex);
nextedge.SetOrg(null);
nextedge.SetDest(upperleft);
nextedge.SetApex(nextapex);
// Consider the newly exposed vertex.
upperleft = nextapex;
// What vertex would be exposed if another edge were deleted?
sidecasing.Copy(ref nextedge);
nextapex = nextedge.Apex();
if (nextapex != null)
{
// Check whether the edge is Delaunay.
badedge = Primitives.InCircle(lowerleft, lowerright, upperleft, nextapex) > 0.0;
}
else
{
// Avoid eating right through the triangulation.
badedge = false;
}
}
}
}
// Consider eliminating edges from the right triangulation.
if (!rightfinished)
{
// What vertex would be exposed if an edge were deleted?
rightcand.Lnext(ref nextedge);
nextedge.SymSelf();
nextapex = nextedge.Apex();
// If nextapex is NULL, then no vertex would be exposed; the
// triangulation would have been eaten right through.
if (nextapex != null)
{
// Check whether the edge is Delaunay.
badedge = Primitives.InCircle(lowerleft, lowerright, upperright, nextapex) > 0.0;
while (badedge)
{
// Eliminate the edge with an edge flip. As a result, the
// right triangulation will have one more boundary triangle.
nextedge.LprevSelf();
nextedge.Sym(ref topcasing);
nextedge.LprevSelf();
nextedge.Sym(ref sidecasing);
nextedge.Bond(ref topcasing);
rightcand.Bond(ref sidecasing);
rightcand.LprevSelf();
rightcand.Sym(ref outercasing);
nextedge.LnextSelf();
nextedge.Bond(ref outercasing);
// Correct the vertices to reflect the edge flip.
rightcand.SetOrg(null);
rightcand.SetDest(lowerright);
rightcand.SetApex(nextapex);
nextedge.SetOrg(upperright);
nextedge.SetDest(null);
nextedge.SetApex(nextapex);
// Consider the newly exposed vertex.
upperright = nextapex;
// What vertex would be exposed if another edge were deleted?
sidecasing.Copy(ref nextedge);
nextapex = nextedge.Apex();
if (nextapex != null)
{
// Check whether the edge is Delaunay.
badedge = Primitives.InCircle(lowerleft, lowerright, upperright, nextapex) > 0.0;
}
else
{
// Avoid eating right through the triangulation.
badedge = false;
}
}
}
}
if (leftfinished || (!rightfinished &&
(Primitives.InCircle(upperleft, lowerleft, lowerright, upperright) > 0.0)))
{
// Knit the triangulations, adding an edge from 'lowerleft'
// to 'upperright'.
baseedge.Bond(ref rightcand);
rightcand.Lprev(ref baseedge);
baseedge.SetDest(lowerleft);
lowerright = upperright;
baseedge.Sym(ref rightcand);
upperright = rightcand.Apex();
}
else
{
// Knit the triangulations, adding an edge from 'upperleft'
// to 'lowerright'.
baseedge.Bond(ref leftcand);
leftcand.Lnext(ref baseedge);
baseedge.SetOrg(lowerright);
lowerleft = upperleft;
baseedge.Sym(ref leftcand);
upperleft = leftcand.Apex();
}
}
}
/// <summary>
/// Reconstruct a triangulation from its raw data representation.
/// </summary>
/// <param name="mesh"></param>
/// <param name="input"></param>
/// <returns></returns>
/// <remarks>
/// Reads an .ele file and reconstructs the original mesh. If the -p switch
/// is used, this procedure will also read a .poly file and reconstruct the
/// subsegments of the original mesh. If the -a switch is used, this
/// procedure will also read an .area file and set a maximum area constraint
/// on each triangle.
///
/// Vertices that are not corners of triangles, such as nodes on edges of
/// subparametric elements, are discarded.
///
/// This routine finds the adjacencies between triangles (and subsegments)
/// by forming one stack of triangles for each vertex. Each triangle is on
/// three different stacks simultaneously. Each triangle's subsegment
/// pointers are used to link the items in each stack. This memory-saving
/// feature makes the code harder to read. The most important thing to keep
/// in mind is that each triangle is removed from a stack precisely when
/// the corresponding pointer is adjusted to refer to a subsegment rather
/// than the next triangle of the stack.
/// </remarks>
public static int Reconstruct(Mesh mesh, InputGeometry input, ITriangle[] triangles)
{
int hullsize = 0;
Otri tri = default(Otri);
Otri triangleleft = default(Otri);
Otri checktri = default(Otri);
Otri checkleft = default(Otri);
Otri checkneighbor = default(Otri);
Osub subseg = default(Osub);
List <Otri>[] vertexarray; // Triangle
Otri prevlink; // Triangle
Otri nexttri; // Triangle
Vertex tdest, tapex;
Vertex checkdest, checkapex;
Vertex shorg;
Vertex segmentorg, segmentdest;
int[] corner = new int[3];
int[] end = new int[2];
//bool segmentmarkers = false;
int boundmarker;
int aroundvertex;
bool notfound;
int i = 0;
int elements = triangles == null ? 0 : triangles.Length;
int numberofsegments = input.segments.Count;
mesh.inelements = elements;
mesh.regions.AddRange(input.regions);
// Create the triangles.
for (i = 0; i < mesh.inelements; i++)
{
mesh.MakeTriangle(ref tri);
// Mark the triangle as living.
//tri.triangle.neighbors[0].triangle = tri.triangle;
}
if (mesh.behavior.Poly)
{
mesh.insegments = numberofsegments;
// Create the subsegments.
for (i = 0; i < mesh.insegments; i++)
{
mesh.MakeSegment(ref subseg);
// Mark the subsegment as living.
//subseg.ss.subsegs[0].ss = subseg.ss;
}
}
// Allocate a temporary array that maps each vertex to some adjacent
// triangle. I took care to allocate all the permanent memory for
// triangles and subsegments first.
vertexarray = new List <Otri> [mesh.vertices.Count];
// Each vertex is initially unrepresented.
for (i = 0; i < mesh.vertices.Count; i++)
{
Otri tmp = default(Otri);
tmp.triangle = Mesh.dummytri;
vertexarray[i] = new List <Otri>(3);
vertexarray[i].Add(tmp);
}
i = 0;
// Read the triangles from the .ele file, and link
// together those that share an edge.
foreach (var item in mesh.triangles.Values)
{
tri.triangle = item;
corner[0] = triangles[i].P0;
corner[1] = triangles[i].P1;
corner[2] = triangles[i].P2;
// Copy the triangle's three corners.
for (int j = 0; j < 3; j++)
{
if ((corner[j] < 0) || (corner[j] >= mesh.invertices))
{
SimpleLog.Instance.Error("Triangle has an invalid vertex index.", "MeshReader.Reconstruct()");
throw new Exception("Triangle has an invalid vertex index.");
}
}
// Read the triangle's attributes.
tri.triangle.region = triangles[i].Region;
// TODO: VarArea
if (mesh.behavior.VarArea)
{
tri.triangle.area = triangles[i].Area;
}
// Set the triangle's vertices.
tri.orient = 0;
tri.SetOrg(mesh.vertices[corner[0]]);
tri.SetDest(mesh.vertices[corner[1]]);
tri.SetApex(mesh.vertices[corner[2]]);
// Try linking the triangle to others that share these vertices.
for (tri.orient = 0; tri.orient < 3; tri.orient++)
{
// Take the number for the origin of triangleloop.
aroundvertex = corner[tri.orient];
int index = vertexarray[aroundvertex].Count - 1;
// Look for other triangles having this vertex.
nexttri = vertexarray[aroundvertex][index];
// Link the current triangle to the next one in the stack.
//tri.triangle.neighbors[tri.orient] = nexttri;
// Push the current triangle onto the stack.
vertexarray[aroundvertex].Add(tri);
checktri = nexttri;
if (checktri.triangle != Mesh.dummytri)
{
tdest = tri.Dest();
tapex = tri.Apex();
// Look for other triangles that share an edge.
do
{
checkdest = checktri.Dest();
checkapex = checktri.Apex();
if (tapex == checkdest)
{
// The two triangles share an edge; bond them together.
tri.Lprev(ref triangleleft);
triangleleft.Bond(ref checktri);
}
if (tdest == checkapex)
{
// The two triangles share an edge; bond them together.
checktri.Lprev(ref checkleft);
tri.Bond(ref checkleft);
}
// Find the next triangle in the stack.
index--;
nexttri = vertexarray[aroundvertex][index];
checktri = nexttri;
} while (checktri.triangle != Mesh.dummytri);
}
}
i++;
}
// Prepare to count the boundary edges.
hullsize = 0;
if (mesh.behavior.Poly)
{
// Read the segments from the .poly file, and link them
// to their neighboring triangles.
boundmarker = 0;
i = 0;
foreach (var item in mesh.subsegs.Values)
{
subseg.seg = item;
end[0] = input.segments[i].P0;
end[1] = input.segments[i].P1;
boundmarker = input.segments[i].Boundary;
for (int j = 0; j < 2; j++)
{
if ((end[j] < 0) || (end[j] >= mesh.invertices))
{
SimpleLog.Instance.Error("Segment has an invalid vertex index.", "MeshReader.Reconstruct()");
throw new Exception("Segment has an invalid vertex index.");
}
}
// set the subsegment's vertices.
subseg.orient = 0;
segmentorg = mesh.vertices[end[0]];
segmentdest = mesh.vertices[end[1]];
subseg.SetOrg(segmentorg);
subseg.SetDest(segmentdest);
subseg.SetSegOrg(segmentorg);
subseg.SetSegDest(segmentdest);
subseg.seg.boundary = boundmarker;
// Try linking the subsegment to triangles that share these vertices.
for (subseg.orient = 0; subseg.orient < 2; subseg.orient++)
{
// Take the number for the destination of subsegloop.
aroundvertex = end[1 - subseg.orient];
int index = vertexarray[aroundvertex].Count - 1;
// Look for triangles having this vertex.
prevlink = vertexarray[aroundvertex][index];
nexttri = vertexarray[aroundvertex][index];
checktri = nexttri;
shorg = subseg.Org();
notfound = true;
// Look for triangles having this edge. Note that I'm only
// comparing each triangle's destination with the subsegment;
// each triangle's apex is handled through a different vertex.
// Because each triangle appears on three vertices' lists, each
// occurrence of a triangle on a list can (and does) represent
// an edge. In this way, most edges are represented twice, and
// every triangle-subsegment bond is represented once.
while (notfound && (checktri.triangle != Mesh.dummytri))
{
checkdest = checktri.Dest();
if (shorg == checkdest)
{
// We have a match. Remove this triangle from the list.
//prevlink = vertexarray[aroundvertex][index];
vertexarray[aroundvertex].Remove(prevlink);
// Bond the subsegment to the triangle.
checktri.SegBond(ref subseg);
// Check if this is a boundary edge.
checktri.Sym(ref checkneighbor);
if (checkneighbor.triangle == Mesh.dummytri)
{
// The next line doesn't insert a subsegment (because there's
// already one there), but it sets the boundary markers of
// the existing subsegment and its vertices.
mesh.InsertSubseg(ref checktri, 1);
hullsize++;
}
notfound = false;
}
index--;
// Find the next triangle in the stack.
prevlink = vertexarray[aroundvertex][index];
nexttri = vertexarray[aroundvertex][index];
checktri = nexttri;
}
}
i++;
}
}
// Mark the remaining edges as not being attached to any subsegment.
// Also, count the (yet uncounted) boundary edges.
for (i = 0; i < mesh.vertices.Count; i++)
{
// Search the stack of triangles adjacent to a vertex.
int index = vertexarray[i].Count - 1;
nexttri = vertexarray[i][index];
checktri = nexttri;
while (checktri.triangle != Mesh.dummytri)
{
// Find the next triangle in the stack before this
// information gets overwritten.
index--;
nexttri = vertexarray[i][index];
// No adjacent subsegment. (This overwrites the stack info.)
checktri.SegDissolve();
checktri.Sym(ref checkneighbor);
if (checkneighbor.triangle == Mesh.dummytri)
{
mesh.InsertSubseg(ref checktri, 1);
hullsize++;
}
checktri = nexttri;
}
}
return(hullsize);
}
public IMesh Triangulate(IList <Vertex> points, Configuration config)
{
this.predicates = config.Predicates();
this.mesh = new Mesh(config);
this.mesh.TransferNodes(points);
// Nonexistent x value used as a flag to mark circle events in sweepline
// Delaunay algorithm.
xminextreme = 10 * mesh.bounds.Left - 9 * mesh.bounds.Right;
SweepEvent[] eventheap;
SweepEvent nextevent;
SweepEvent newevent;
SplayNode splayroot;
Otri bottommost = default(Otri);
Otri searchtri = default(Otri);
Otri fliptri;
Otri lefttri = default(Otri);
Otri righttri = default(Otri);
Otri farlefttri = default(Otri);
Otri farrighttri = default(Otri);
Otri inserttri = default(Otri);
Vertex firstvertex, secondvertex;
Vertex nextvertex, lastvertex;
Vertex connectvertex;
Vertex leftvertex, midvertex, rightvertex;
double lefttest, righttest;
int heapsize;
bool check4events, farrightflag = false;
splaynodes = new List <SplayNode>();
splayroot = null;
heapsize = points.Count;
CreateHeap(out eventheap, heapsize);//, out events, out freeevents);
mesh.MakeTriangle(ref lefttri);
mesh.MakeTriangle(ref righttri);
lefttri.Bond(ref righttri);
lefttri.Lnext();
righttri.Lprev();
lefttri.Bond(ref righttri);
lefttri.Lnext();
righttri.Lprev();
lefttri.Bond(ref righttri);
firstvertex = eventheap[0].vertexEvent;
HeapDelete(eventheap, heapsize, 0);
heapsize--;
do
{
if (heapsize == 0)
{
Log.Instance.Error("Input vertices are all identical.", "SweepLine.Triangulate()");
throw new Exception("Input vertices are all identical.");
}
secondvertex = eventheap[0].vertexEvent;
HeapDelete(eventheap, heapsize, 0);
heapsize--;
if ((firstvertex.x == secondvertex.x) &&
(firstvertex.y == secondvertex.y))
{
if (Log.Verbose)
{
Log.Instance.Warning("A duplicate vertex appeared and was ignored (ID " + secondvertex.id + ").",
"SweepLine.Triangulate().1");
}
secondvertex.type = VertexType.UndeadVertex;
mesh.undeads++;
}
} while ((firstvertex.x == secondvertex.x) &&
(firstvertex.y == secondvertex.y));
lefttri.SetOrg(firstvertex);
lefttri.SetDest(secondvertex);
righttri.SetOrg(secondvertex);
righttri.SetDest(firstvertex);
lefttri.Lprev(ref bottommost);
lastvertex = secondvertex;
while (heapsize > 0)
{
nextevent = eventheap[0];
HeapDelete(eventheap, heapsize, 0);
heapsize--;
check4events = true;
if (nextevent.xkey < mesh.bounds.Left)
{
fliptri = nextevent.otriEvent;
fliptri.Oprev(ref farlefttri);
Check4DeadEvent(ref farlefttri, eventheap, ref heapsize);
fliptri.Onext(ref farrighttri);
Check4DeadEvent(ref farrighttri, eventheap, ref heapsize);
if (farlefttri.Equals(bottommost))
{
fliptri.Lprev(ref bottommost);
}
mesh.Flip(ref fliptri);
fliptri.SetApex(null);
fliptri.Lprev(ref lefttri);
fliptri.Lnext(ref righttri);
lefttri.Sym(ref farlefttri);
if (randomnation(SAMPLERATE) == 0)
{
fliptri.Sym();
leftvertex = fliptri.Dest();
midvertex = fliptri.Apex();
rightvertex = fliptri.Org();
splayroot = CircleTopInsert(splayroot, lefttri, leftvertex, midvertex, rightvertex, nextevent.ykey);
}
}
else
{
nextvertex = nextevent.vertexEvent;
if ((nextvertex.x == lastvertex.x) &&
(nextvertex.y == lastvertex.y))
{
if (Log.Verbose)
{
Log.Instance.Warning("A duplicate vertex appeared and was ignored (ID " + nextvertex.id + ").",
"SweepLine.Triangulate().2");
}
nextvertex.type = VertexType.UndeadVertex;
mesh.undeads++;
check4events = false;
}
else
{
lastvertex = nextvertex;
splayroot = FrontLocate(splayroot, bottommost, nextvertex, ref searchtri, ref farrightflag);
//bottommost.Copy(ref searchtri);
//farrightflag = false;
//while (!farrightflag && RightOfHyperbola(ref searchtri, nextvertex))
//{
// searchtri.OnextSelf();
// farrightflag = searchtri.Equal(bottommost);
//}
Check4DeadEvent(ref searchtri, eventheap, ref heapsize);
searchtri.Copy(ref farrighttri);
searchtri.Sym(ref farlefttri);
mesh.MakeTriangle(ref lefttri);
mesh.MakeTriangle(ref righttri);
connectvertex = farrighttri.Dest();
lefttri.SetOrg(connectvertex);
lefttri.SetDest(nextvertex);
righttri.SetOrg(nextvertex);
righttri.SetDest(connectvertex);
lefttri.Bond(ref righttri);
lefttri.Lnext();
righttri.Lprev();
lefttri.Bond(ref righttri);
lefttri.Lnext();
righttri.Lprev();
lefttri.Bond(ref farlefttri);
righttri.Bond(ref farrighttri);
if (!farrightflag && farrighttri.Equals(bottommost))
{
lefttri.Copy(ref bottommost);
}
if (randomnation(SAMPLERATE) == 0)
{
splayroot = SplayInsert(splayroot, lefttri, nextvertex);
}
else if (randomnation(SAMPLERATE) == 0)
{
righttri.Lnext(ref inserttri);
splayroot = SplayInsert(splayroot, inserttri, nextvertex);
}
}
}
if (check4events)
{
leftvertex = farlefttri.Apex();
midvertex = lefttri.Dest();
rightvertex = lefttri.Apex();
lefttest = predicates.CounterClockwise(leftvertex, midvertex, rightvertex);
if (lefttest > 0.0)
{
newevent = new SweepEvent();
newevent.xkey = xminextreme;
newevent.ykey = CircleTop(leftvertex, midvertex, rightvertex, lefttest);
newevent.otriEvent = lefttri;
HeapInsert(eventheap, heapsize, newevent);
heapsize++;
lefttri.SetOrg(new SweepEventVertex(newevent));
}
leftvertex = righttri.Apex();
midvertex = righttri.Org();
rightvertex = farrighttri.Apex();
righttest = predicates.CounterClockwise(leftvertex, midvertex, rightvertex);
if (righttest > 0.0)
{
newevent = new SweepEvent();
newevent.xkey = xminextreme;
newevent.ykey = CircleTop(leftvertex, midvertex, rightvertex, righttest);
newevent.otriEvent = farrighttri;
HeapInsert(eventheap, heapsize, newevent);
heapsize++;
farrighttri.SetOrg(new SweepEventVertex(newevent));
}
}
}
splaynodes.Clear();
bottommost.Lprev();
this.mesh.hullsize = RemoveGhosts(ref bottommost);
return(this.mesh);
}
public int Triangulate(Mesh mesh)
{
SweepLine.SweepEvent[] sweepEventArray;
SweepLine.SweepEvent sweepEvent;
Vertex vertex;
Vertex vertex1;
Vertex vertex2;
Vertex vertex3;
this.mesh = mesh;
this.xminextreme = 10 * mesh.bounds.Xmin - 9 * mesh.bounds.Xmax;
Otri otri = new Otri();
Otri otri1 = new Otri();
Otri otri2 = new Otri();
Otri otri3 = new Otri();
Otri otri4 = new Otri();
Otri otri5 = new Otri();
Otri otri6 = new Otri();
bool i = false;
this.splaynodes = new List <SweepLine.SplayNode>();
SweepLine.SplayNode splayNode = null;
this.CreateHeap(out sweepEventArray);
int num = mesh.invertices;
mesh.MakeTriangle(ref otri2);
mesh.MakeTriangle(ref otri3);
otri2.Bond(ref otri3);
otri2.LnextSelf();
otri3.LprevSelf();
otri2.Bond(ref otri3);
otri2.LnextSelf();
otri3.LprevSelf();
otri2.Bond(ref otri3);
Vertex vertex4 = sweepEventArray[0].vertexEvent;
this.HeapDelete(sweepEventArray, num, 0);
num--;
do
{
if (num == 0)
{
SimpleLog.Instance.Error("Input vertices are all identical.", "SweepLine.SweepLineDelaunay()");
throw new Exception("Input vertices are all identical.");
}
vertex = sweepEventArray[0].vertexEvent;
this.HeapDelete(sweepEventArray, num, 0);
num--;
if (vertex4.x != vertex.x || vertex4.y != vertex.y)
{
continue;
}
if (Behavior.Verbose)
{
SimpleLog.Instance.Warning("A duplicate vertex appeared and was ignored.", "SweepLine.SweepLineDelaunay().1");
}
vertex.type = VertexType.UndeadVertex;
Mesh mesh1 = mesh;
mesh1.undeads = mesh1.undeads + 1;
}while (vertex4.x == vertex.x && vertex4.y == vertex.y);
otri2.SetOrg(vertex4);
otri2.SetDest(vertex);
otri3.SetOrg(vertex);
otri3.SetDest(vertex4);
otri2.Lprev(ref otri);
Vertex vertex5 = vertex;
while (num > 0)
{
SweepLine.SweepEvent sweepEvent1 = sweepEventArray[0];
this.HeapDelete(sweepEventArray, num, 0);
num--;
bool flag = true;
if (sweepEvent1.xkey >= mesh.bounds.Xmin)
{
Vertex vertex6 = sweepEvent1.vertexEvent;
if (vertex6.x != vertex5.x || vertex6.y != vertex5.y)
{
vertex5 = vertex6;
splayNode = this.FrontLocate(splayNode, otri, vertex6, ref otri1, ref i);
otri.Copy(ref otri1);
for (i = false; !i && this.RightOfHyperbola(ref otri1, vertex6); i = otri1.Equal(otri))
{
otri1.OnextSelf();
}
this.Check4DeadEvent(ref otri1, sweepEventArray, ref num);
otri1.Copy(ref otri5);
otri1.Sym(ref otri4);
mesh.MakeTriangle(ref otri2);
mesh.MakeTriangle(ref otri3);
Vertex vertex7 = otri5.Dest();
otri2.SetOrg(vertex7);
otri2.SetDest(vertex6);
otri3.SetOrg(vertex6);
otri3.SetDest(vertex7);
otri2.Bond(ref otri3);
otri2.LnextSelf();
otri3.LprevSelf();
otri2.Bond(ref otri3);
otri2.LnextSelf();
otri3.LprevSelf();
otri2.Bond(ref otri4);
otri3.Bond(ref otri5);
if (!i && otri5.Equal(otri))
{
otri2.Copy(ref otri);
}
if (this.randomnation(SweepLine.SAMPLERATE) == 0)
{
splayNode = this.SplayInsert(splayNode, otri2, vertex6);
}
else if (this.randomnation(SweepLine.SAMPLERATE) == 0)
{
otri3.Lnext(ref otri6);
splayNode = this.SplayInsert(splayNode, otri6, vertex6);
}
}
else
{
if (Behavior.Verbose)
{
SimpleLog.Instance.Warning("A duplicate vertex appeared and was ignored.", "SweepLine.SweepLineDelaunay().2");
}
vertex6.type = VertexType.UndeadVertex;
Mesh mesh2 = mesh;
mesh2.undeads = mesh2.undeads + 1;
flag = false;
}
}
else
{
Otri otri7 = sweepEvent1.otriEvent;
otri7.Oprev(ref otri4);
this.Check4DeadEvent(ref otri4, sweepEventArray, ref num);
otri7.Onext(ref otri5);
this.Check4DeadEvent(ref otri5, sweepEventArray, ref num);
if (otri4.Equal(otri))
{
otri7.Lprev(ref otri);
}
mesh.Flip(ref otri7);
otri7.SetApex(null);
otri7.Lprev(ref otri2);
otri7.Lnext(ref otri3);
otri2.Sym(ref otri4);
if (this.randomnation(SweepLine.SAMPLERATE) == 0)
{
otri7.SymSelf();
vertex1 = otri7.Dest();
vertex2 = otri7.Apex();
vertex3 = otri7.Org();
splayNode = this.CircleTopInsert(splayNode, otri2, vertex1, vertex2, vertex3, sweepEvent1.ykey);
}
}
if (!flag)
{
continue;
}
vertex1 = otri4.Apex();
vertex2 = otri2.Dest();
vertex3 = otri2.Apex();
double num1 = Primitives.CounterClockwise(vertex1, vertex2, vertex3);
if (num1 > 0)
{
sweepEvent = new SweepLine.SweepEvent()
{
xkey = this.xminextreme,
ykey = this.CircleTop(vertex1, vertex2, vertex3, num1),
otriEvent = otri2
};
this.HeapInsert(sweepEventArray, num, sweepEvent);
num++;
otri2.SetOrg(new SweepLine.SweepEventVertex(sweepEvent));
}
vertex1 = otri3.Apex();
vertex2 = otri3.Org();
vertex3 = otri5.Apex();
double num2 = Primitives.CounterClockwise(vertex1, vertex2, vertex3);
if (num2 <= 0)
{
continue;
}
sweepEvent = new SweepLine.SweepEvent()
{
xkey = this.xminextreme,
ykey = this.CircleTop(vertex1, vertex2, vertex3, num2),
otriEvent = otri5
};
this.HeapInsert(sweepEventArray, num, sweepEvent);
num++;
otri5.SetOrg(new SweepLine.SweepEventVertex(sweepEvent));
}
this.splaynodes.Clear();
otri.LprevSelf();
return(this.RemoveGhosts(ref otri));
}
/// <summary>
/// Finds the adjacencies between triangles by forming a stack of triangles for
/// each vertex. Each triangle is on three different stacks simultaneously.
/// </summary>
private static List <Otri>[] SetNeighbors(Mesh mesh, ITriangle[] triangles)
{
Otri tri = default(Otri);
Otri triangleleft = default(Otri);
Otri checktri = default(Otri);
Otri checkleft = default(Otri);
Otri nexttri;
TVertex tdest, tapex;
TVertex checkdest, checkapex;
int[] corner = new int[3];
int aroundvertex;
int i;
// Allocate a temporary array that maps each vertex to some adjacent triangle.
var vertexarray = new List <Otri> [mesh.vertices.Count];
// Each vertex is initially unrepresented.
for (i = 0; i < mesh.vertices.Count; i++)
{
Otri tmp = default(Otri);
tmp.tri = mesh.dummytri;
vertexarray[i] = new List <Otri>(3);
vertexarray[i].Add(tmp);
}
i = 0;
// Read the triangles from the .ele file, and link
// together those that share an edge.
foreach (var item in mesh.triangles)
{
tri.tri = item;
// Copy the triangle's three corners.
for (int j = 0; j < 3; j++)
{
corner[j] = triangles[i].GetVertexID(j);
if ((corner[j] < 0) || (corner[j] >= mesh.invertices))
{
Log.Instance.Error("Triangle has an invalid vertex index.", "MeshReader.Reconstruct()");
throw new Exception("Triangle has an invalid vertex index.");
}
}
// Read the triangle's attributes.
tri.tri.label = triangles[i].Label;
// TODO: VarArea
if (mesh.behavior.VarArea)
{
tri.tri.area = triangles[i].Area;
}
// Set the triangle's vertices.
tri.orient = 0;
tri.SetOrg(mesh.vertices[corner[0]]);
tri.SetDest(mesh.vertices[corner[1]]);
tri.SetApex(mesh.vertices[corner[2]]);
// Try linking the triangle to others that share these vertices.
for (tri.orient = 0; tri.orient < 3; tri.orient++)
{
// Take the number for the origin of triangleloop.
aroundvertex = corner[tri.orient];
int index = vertexarray[aroundvertex].Count - 1;
// Look for other triangles having this vertex.
nexttri = vertexarray[aroundvertex][index];
// Push the current triangle onto the stack.
vertexarray[aroundvertex].Add(tri);
checktri = nexttri;
if (checktri.tri.id != Mesh.DUMMY)
{
tdest = tri.Dest();
tapex = tri.Apex();
// Look for other triangles that share an edge.
do
{
checkdest = checktri.Dest();
checkapex = checktri.Apex();
if (tapex == checkdest)
{
// The two triangles share an edge; bond them together.
tri.Lprev(ref triangleleft);
triangleleft.Bond(ref checktri);
}
if (tdest == checkapex)
{
// The two triangles share an edge; bond them together.
checktri.Lprev(ref checkleft);
tri.Bond(ref checkleft);
}
// Find the next triangle in the stack.
index--;
nexttri = vertexarray[aroundvertex][index];
checktri = nexttri;
}while (checktri.tri.id != Mesh.DUMMY);
}
}
i++;
}
return(vertexarray);
}
private void DivconqRecurse(int left, int right, int axis, ref Otri farleft, ref Otri farright)
{
Otri otri = new Otri();
Otri otri1 = new Otri();
Otri otri2 = new Otri();
Otri otri3 = new Otri();
Otri otri4 = new Otri();
Otri otri5 = new Otri();
int num = right - left + 1;
if (num == 2)
{
this.mesh.MakeTriangle(ref farleft);
farleft.SetOrg(this.sortarray[left]);
farleft.SetDest(this.sortarray[left + 1]);
this.mesh.MakeTriangle(ref farright);
farright.SetOrg(this.sortarray[left + 1]);
farright.SetDest(this.sortarray[left]);
farleft.Bond(ref farright);
farleft.LprevSelf();
farright.LnextSelf();
farleft.Bond(ref farright);
farleft.LprevSelf();
farright.LnextSelf();
farleft.Bond(ref farright);
farright.Lprev(ref farleft);
return;
}
if (num != 3)
{
int num1 = num >> 1;
this.DivconqRecurse(left, left + num1 - 1, 1 - axis, ref farleft, ref otri4);
this.DivconqRecurse(left + num1, right, 1 - axis, ref otri5, ref farright);
this.MergeHulls(ref farleft, ref otri4, ref otri5, ref farright, axis);
return;
}
this.mesh.MakeTriangle(ref otri);
this.mesh.MakeTriangle(ref otri1);
this.mesh.MakeTriangle(ref otri2);
this.mesh.MakeTriangle(ref otri3);
double num2 = Primitives.CounterClockwise(this.sortarray[left], this.sortarray[left + 1], this.sortarray[left + 2]);
if (num2 == 0)
{
otri.SetOrg(this.sortarray[left]);
otri.SetDest(this.sortarray[left + 1]);
otri1.SetOrg(this.sortarray[left + 1]);
otri1.SetDest(this.sortarray[left]);
otri2.SetOrg(this.sortarray[left + 2]);
otri2.SetDest(this.sortarray[left + 1]);
otri3.SetOrg(this.sortarray[left + 1]);
otri3.SetDest(this.sortarray[left + 2]);
otri.Bond(ref otri1);
otri2.Bond(ref otri3);
otri.LnextSelf();
otri1.LprevSelf();
otri2.LnextSelf();
otri3.LprevSelf();
otri.Bond(ref otri3);
otri1.Bond(ref otri2);
otri.LnextSelf();
otri1.LprevSelf();
otri2.LnextSelf();
otri3.LprevSelf();
otri.Bond(ref otri1);
otri2.Bond(ref otri3);
otri1.Copy(ref farleft);
otri2.Copy(ref farright);
return;
}
otri.SetOrg(this.sortarray[left]);
otri1.SetDest(this.sortarray[left]);
otri3.SetOrg(this.sortarray[left]);
if (num2 <= 0)
{
otri.SetDest(this.sortarray[left + 2]);
otri1.SetOrg(this.sortarray[left + 2]);
otri2.SetDest(this.sortarray[left + 2]);
otri.SetApex(this.sortarray[left + 1]);
otri2.SetOrg(this.sortarray[left + 1]);
otri3.SetDest(this.sortarray[left + 1]);
}
else
{
otri.SetDest(this.sortarray[left + 1]);
otri1.SetOrg(this.sortarray[left + 1]);
otri2.SetDest(this.sortarray[left + 1]);
otri.SetApex(this.sortarray[left + 2]);
otri2.SetOrg(this.sortarray[left + 2]);
otri3.SetDest(this.sortarray[left + 2]);
}
otri.Bond(ref otri1);
otri.LnextSelf();
otri.Bond(ref otri2);
otri.LnextSelf();
otri.Bond(ref otri3);
otri1.LprevSelf();
otri2.LnextSelf();
otri1.Bond(ref otri2);
otri1.LprevSelf();
otri3.LprevSelf();
otri1.Bond(ref otri3);
otri2.LnextSelf();
otri3.LprevSelf();
otri2.Bond(ref otri3);
otri1.Copy(ref farleft);
if (num2 > 0)
{
otri2.Copy(ref farright);
return;
}
farleft.Lnext(ref farright);
}
private void MergeHulls(ref Otri farleft, ref Otri innerleft, ref Otri innerright, ref Otri farright, int axis)
{
Vertex vertex;
Vertex vertex1;
Vertex vertex2;
Vertex vertex3;
Vertex vertex4;
Vertex i;
bool flag;
bool flag1;
Otri otri = new Otri();
Otri otri1 = new Otri();
Otri otri2 = new Otri();
Otri otri3 = new Otri();
Otri otri4 = new Otri();
Otri otri5 = new Otri();
Otri otri6 = new Otri();
Otri otri7 = new Otri();
Vertex vertex5 = innerleft.Dest();
Vertex vertex6 = innerleft.Apex();
Vertex vertex7 = innerright.Org();
Vertex vertex8 = innerright.Apex();
if (this.useDwyer && axis == 1)
{
vertex = farleft.Org();
vertex2 = farleft.Apex();
vertex1 = farright.Dest();
vertex3 = farright.Apex();
while (vertex2.y < vertex.y)
{
farleft.LnextSelf();
farleft.SymSelf();
vertex = vertex2;
vertex2 = farleft.Apex();
}
innerleft.Sym(ref otri6);
for (i = otri6.Apex(); i.y > vertex5.y; i = otri6.Apex())
{
otri6.Lnext(ref innerleft);
vertex6 = vertex5;
vertex5 = i;
innerleft.Sym(ref otri6);
}
while (vertex8.y < vertex7.y)
{
innerright.LnextSelf();
innerright.SymSelf();
vertex7 = vertex8;
vertex8 = innerright.Apex();
}
farright.Sym(ref otri6);
for (i = otri6.Apex(); i.y > vertex1.y; i = otri6.Apex())
{
otri6.Lnext(ref farright);
vertex3 = vertex1;
vertex1 = i;
farright.Sym(ref otri6);
}
}
do
{
flag = false;
if (Primitives.CounterClockwise(vertex5, vertex6, vertex7) > 0)
{
innerleft.LprevSelf();
innerleft.SymSelf();
vertex5 = vertex6;
vertex6 = innerleft.Apex();
flag = true;
}
if (Primitives.CounterClockwise(vertex8, vertex7, vertex5) <= 0)
{
continue;
}
innerright.LnextSelf();
innerright.SymSelf();
vertex7 = vertex8;
vertex8 = innerright.Apex();
flag = true;
}while (flag);
innerleft.Sym(ref otri);
innerright.Sym(ref otri1);
this.mesh.MakeTriangle(ref otri7);
otri7.Bond(ref innerleft);
otri7.LnextSelf();
otri7.Bond(ref innerright);
otri7.LnextSelf();
otri7.SetOrg(vertex7);
otri7.SetDest(vertex5);
vertex = farleft.Org();
if (vertex5 == vertex)
{
otri7.Lnext(ref farleft);
}
vertex1 = farright.Dest();
if (vertex7 == vertex1)
{
otri7.Lprev(ref farright);
}
Vertex vertex9 = vertex5;
Vertex vertex10 = vertex7;
Vertex vertex11 = otri.Apex();
Vertex vertex12 = otri1.Apex();
while (true)
{
bool flag2 = Primitives.CounterClockwise(vertex11, vertex9, vertex10) <= 0;
bool flag3 = Primitives.CounterClockwise(vertex12, vertex9, vertex10) <= 0;
if (flag2 & flag3)
{
break;
}
if (!flag2)
{
otri.Lprev(ref otri2);
otri2.SymSelf();
vertex4 = otri2.Apex();
if (vertex4 != null)
{
flag1 = Primitives.InCircle(vertex9, vertex10, vertex11, vertex4) > 0;
while (flag1)
{
otri2.LnextSelf();
otri2.Sym(ref otri4);
otri2.LnextSelf();
otri2.Sym(ref otri3);
otri2.Bond(ref otri4);
otri.Bond(ref otri3);
otri.LnextSelf();
otri.Sym(ref otri5);
otri2.LprevSelf();
otri2.Bond(ref otri5);
otri.SetOrg(vertex9);
otri.SetDest(null);
otri.SetApex(vertex4);
otri2.SetOrg(null);
otri2.SetDest(vertex11);
otri2.SetApex(vertex4);
vertex11 = vertex4;
otri3.Copy(ref otri2);
vertex4 = otri2.Apex();
flag1 = (vertex4 == null ? false : Primitives.InCircle(vertex9, vertex10, vertex11, vertex4) > 0);
}
}
}
if (!flag3)
{
otri1.Lnext(ref otri2);
otri2.SymSelf();
vertex4 = otri2.Apex();
if (vertex4 != null)
{
flag1 = Primitives.InCircle(vertex9, vertex10, vertex12, vertex4) > 0;
while (flag1)
{
otri2.LprevSelf();
otri2.Sym(ref otri4);
otri2.LprevSelf();
otri2.Sym(ref otri3);
otri2.Bond(ref otri4);
otri1.Bond(ref otri3);
otri1.LprevSelf();
otri1.Sym(ref otri5);
otri2.LnextSelf();
otri2.Bond(ref otri5);
otri1.SetOrg(null);
otri1.SetDest(vertex10);
otri1.SetApex(vertex4);
otri2.SetOrg(vertex12);
otri2.SetDest(null);
otri2.SetApex(vertex4);
vertex12 = vertex4;
otri3.Copy(ref otri2);
vertex4 = otri2.Apex();
flag1 = (vertex4 == null ? false : Primitives.InCircle(vertex9, vertex10, vertex12, vertex4) > 0);
}
}
}
if (flag2 || !flag3 && Primitives.InCircle(vertex11, vertex9, vertex10, vertex12) > 0)
{
otri7.Bond(ref otri1);
otri1.Lprev(ref otri7);
otri7.SetDest(vertex9);
vertex10 = vertex12;
otri7.Sym(ref otri1);
vertex12 = otri1.Apex();
}
else
{
otri7.Bond(ref otri);
otri.Lnext(ref otri7);
otri7.SetOrg(vertex10);
vertex9 = vertex11;
otri7.Sym(ref otri);
vertex11 = otri.Apex();
}
}
this.mesh.MakeTriangle(ref otri2);
otri2.SetOrg(vertex9);
otri2.SetDest(vertex10);
otri2.Bond(ref otri7);
otri2.LnextSelf();
otri2.Bond(ref otri1);
otri2.LnextSelf();
otri2.Bond(ref otri);
if (this.useDwyer && axis == 1)
{
vertex = farleft.Org();
vertex2 = farleft.Apex();
vertex1 = farright.Dest();
vertex3 = farright.Apex();
farleft.Sym(ref otri6);
for (i = otri6.Apex(); i.x < vertex.x; i = otri6.Apex())
{
otri6.Lprev(ref farleft);
vertex2 = vertex;
vertex = i;
farleft.Sym(ref otri6);
}
while (vertex3.x > vertex1.x)
{
farright.LprevSelf();
farright.SymSelf();
vertex1 = vertex3;
vertex3 = farright.Apex();
}
}
}
public static int Reconstruct(Mesh mesh, InputGeometry input, ITriangle[] triangles)
{
Otri item;
int num;
int num1 = 0;
Otri region = new Otri();
Otri otri = new Otri();
Otri l = new Otri();
Otri otri1 = new Otri();
Otri otri2 = new Otri();
Osub osub = new Osub();
int[] p0 = new int[3];
int[] p1 = new int[2];
int i = 0;
int num2 = (triangles == null ? 0 : (int)triangles.Length);
int count = input.segments.Count;
mesh.inelements = num2;
mesh.regions.AddRange(input.regions);
for (i = 0; i < mesh.inelements; i++)
{
mesh.MakeTriangle(ref region);
}
if (mesh.behavior.Poly)
{
mesh.insegments = count;
for (i = 0; i < mesh.insegments; i++)
{
mesh.MakeSegment(ref osub);
}
}
List <Otri>[] otris = new List <Otri> [mesh.vertices.Count];
for (i = 0; i < mesh.vertices.Count; i++)
{
Otri otri3 = new Otri()
{
triangle = Mesh.dummytri
};
otris[i] = new List <Otri>(3);
otris[i].Add(otri3);
}
i = 0;
foreach (Triangle value in mesh.triangles.Values)
{
region.triangle = value;
p0[0] = triangles[i].P0;
p0[1] = triangles[i].P1;
p0[2] = triangles[i].P2;
for (int j = 0; j < 3; j++)
{
if (p0[j] < 0 || p0[j] >= mesh.invertices)
{
SimpleLog.Instance.Error("Triangle has an invalid vertex index.", "MeshReader.Reconstruct()");
throw new Exception("Triangle has an invalid vertex index.");
}
}
region.triangle.region = triangles[i].Region;
if (mesh.behavior.VarArea)
{
region.triangle.area = triangles[i].Area;
}
region.orient = 0;
region.SetOrg(mesh.vertices[p0[0]]);
region.SetDest(mesh.vertices[p0[1]]);
region.SetApex(mesh.vertices[p0[2]]);
region.orient = 0;
while (region.orient < 3)
{
num = p0[region.orient];
int count1 = otris[num].Count - 1;
item = otris[num][count1];
otris[num].Add(region);
l = item;
if (l.triangle != Mesh.dummytri)
{
Vertex vertex = region.Dest();
Vertex vertex1 = region.Apex();
do
{
Vertex vertex2 = l.Dest();
Vertex vertex3 = l.Apex();
if (vertex1 == vertex2)
{
region.Lprev(ref otri);
otri.Bond(ref l);
}
if (vertex == vertex3)
{
l.Lprev(ref otri1);
region.Bond(ref otri1);
}
count1--;
item = otris[num][count1];
l = item;
}while (l.triangle != Mesh.dummytri);
}
region.orient = region.orient + 1;
}
i++;
}
num1 = 0;
if (mesh.behavior.Poly)
{
int boundary = 0;
i = 0;
foreach (Segment segment in mesh.subsegs.Values)
{
osub.seg = segment;
p1[0] = input.segments[i].P0;
p1[1] = input.segments[i].P1;
boundary = input.segments[i].Boundary;
for (int k = 0; k < 2; k++)
{
if (p1[k] < 0 || p1[k] >= mesh.invertices)
{
SimpleLog.Instance.Error("Segment has an invalid vertex index.", "MeshReader.Reconstruct()");
throw new Exception("Segment has an invalid vertex index.");
}
}
osub.orient = 0;
Vertex item1 = mesh.vertices[p1[0]];
Vertex item2 = mesh.vertices[p1[1]];
osub.SetOrg(item1);
osub.SetDest(item2);
osub.SetSegOrg(item1);
osub.SetSegDest(item2);
osub.seg.boundary = boundary;
osub.orient = 0;
while (osub.orient < 2)
{
num = p1[1 - osub.orient];
int count2 = otris[num].Count - 1;
Otri item3 = otris[num][count2];
item = otris[num][count2];
l = item;
Vertex vertex4 = osub.Org();
bool flag = true;
while (flag && l.triangle != Mesh.dummytri)
{
if (vertex4 == l.Dest())
{
otris[num].Remove(item3);
l.SegBond(ref osub);
l.Sym(ref otri2);
if (otri2.triangle == Mesh.dummytri)
{
mesh.InsertSubseg(ref l, 1);
num1++;
}
flag = false;
}
count2--;
item3 = otris[num][count2];
item = otris[num][count2];
l = item;
}
osub.orient = osub.orient + 1;
}
i++;
}
}
for (i = 0; i < mesh.vertices.Count; i++)
{
int count3 = otris[i].Count - 1;
item = otris[i][count3];
for (l = item; l.triangle != Mesh.dummytri; l = item)
{
count3--;
item = otris[i][count3];
l.SegDissolve();
l.Sym(ref otri2);
if (otri2.triangle == Mesh.dummytri)
{
mesh.InsertSubseg(ref l, 1);
num1++;
}
}
}
return(num1);
}