/// <summary>
/// Check if given triangle is blinded by given segment.
/// </summary>
/// <param name="tri">Triangle.</param>
/// <param name="seg">Segments</param>
/// <returns>Returns true, if the triangle is blinded.</returns>
private bool TriangleIsBlinded(ref Otri tri, ref Osub seg)
{
Point c, pt;
Vertex torg = tri.Org();
Vertex tdest = tri.Dest();
Vertex tapex = tri.Apex();
Vertex sorg = seg.Org();
Vertex sdest = seg.Dest();
c = points[tri.tri.id];
if (SegmentsIntersect(sorg, sdest, c, torg, out pt, true))
{
return(true);
}
if (SegmentsIntersect(sorg, sdest, c, tdest, out pt, true))
{
return(true);
}
if (SegmentsIntersect(sorg, sdest, c, tapex, out pt, true))
{
return(true);
}
return(false);
}
public int CheckSeg4Encroach(ref Osub testsubseg)
{
double num;
Vertex vertex;
Otri otri = new Otri();
Osub osub = new Osub();
int num1 = 0;
int num2 = 0;
Vertex vertex1 = testsubseg.Org();
Vertex vertex2 = testsubseg.Dest();
testsubseg.TriPivot(ref otri);
if (otri.triangle != Mesh.dummytri)
{
num2++;
vertex = otri.Apex();
num = (vertex1.x - vertex.x) * (vertex2.x - vertex.x) + (vertex1.y - vertex.y) * (vertex2.y - vertex.y);
if (num < 0 && (this.behavior.ConformingDelaunay || num * num >= (2 * this.behavior.goodAngle - 1) * (2 * this.behavior.goodAngle - 1) * ((vertex1.x - vertex.x) * (vertex1.x - vertex.x) + (vertex1.y - vertex.y) * (vertex1.y - vertex.y)) * ((vertex2.x - vertex.x) * (vertex2.x - vertex.x) + (vertex2.y - vertex.y) * (vertex2.y - vertex.y))))
{
num1 = 1;
}
}
testsubseg.Sym(ref osub);
osub.TriPivot(ref otri);
if (otri.triangle != Mesh.dummytri)
{
num2++;
vertex = otri.Apex();
num = (vertex1.x - vertex.x) * (vertex2.x - vertex.x) + (vertex1.y - vertex.y) * (vertex2.y - vertex.y);
if (num < 0 && (this.behavior.ConformingDelaunay || num * num >= (2 * this.behavior.goodAngle - 1) * (2 * this.behavior.goodAngle - 1) * ((vertex1.x - vertex.x) * (vertex1.x - vertex.x) + (vertex1.y - vertex.y) * (vertex1.y - vertex.y)) * ((vertex2.x - vertex.x) * (vertex2.x - vertex.x) + (vertex2.y - vertex.y) * (vertex2.y - vertex.y))))
{
num1 = num1 + 2;
}
}
if (num1 > 0 && (this.behavior.NoBisect == 0 || this.behavior.NoBisect == 1 && num2 == 2))
{
BadSubseg badSubseg = new BadSubseg();
if (num1 != 1)
{
badSubseg.encsubseg = osub;
badSubseg.subsegorg = vertex2;
badSubseg.subsegdest = vertex1;
}
else
{
badSubseg.encsubseg = testsubseg;
badSubseg.subsegorg = vertex1;
badSubseg.subsegdest = vertex2;
}
this.badsubsegs.Enqueue(badSubseg);
}
return(num1);
}
private bool TriangleIsBlinded(ref Otri tri, ref Osub seg)
{
Point point;
Vertex vertex = tri.Org();
Vertex vertex1 = tri.Dest();
Vertex vertex2 = tri.Apex();
Vertex vertex3 = seg.Org();
Vertex vertex4 = seg.Dest();
Point point1 = this.points[tri.triangle.id];
if (this.SegmentsIntersect(vertex3, vertex4, point1, vertex, out point, true))
{
return(true);
}
if (this.SegmentsIntersect(vertex3, vertex4, point1, vertex1, out point, true))
{
return(true);
}
if (this.SegmentsIntersect(vertex3, vertex4, point1, vertex2, out point, true))
{
return(true);
}
return(false);
}
private void ConstructBoundaryCell(Vertex vertex)
{
VoronoiRegion region = new VoronoiRegion(vertex);
regions.Add(region);
Otri f = default(Otri);
Otri f_init = default(Otri);
Otri f_next = default(Otri);
Otri f_prev = default(Otri);
Osub sf = default(Osub);
Osub sfn = default(Osub);
Vertex torg, tdest, tapex, sorg, sdest;
Point cc_f, cc_f_next, p;
int n = _TriangleNetMesh.triangles.Count;
// Call P the polygon (cell) in construction
List <Point> vpoints = new List <Point>();
// Call f_init a triangle incident to x
vertex.tri.Copy(ref f_init);
if (f_init.Org() != vertex)
{
throw new Exception("ConstructBoundaryCell: inconsistent topology.");
}
// Let f be initialized to f_init
f_init.Copy(ref f);
// Call f_next the next triangle counterclockwise around x
f_init.Onext(ref f_next);
f_init.Oprev(ref f_prev);
// Is the border to the left?
if (f_prev.tri.id != TriangleNetMesh.DUMMY)
{
// Go clockwise until we reach the border (or the initial triangle)
while (f_prev.tri.id != TriangleNetMesh.DUMMY && !f_prev.Equals(f_init))
{
f_prev.Copy(ref f);
f_prev.Oprev();
}
f.Copy(ref f_init);
f.Onext(ref f_next);
}
if (f_prev.tri.id == TriangleNetMesh.DUMMY)
{
// For vertices on the domain boundaray, add the vertex. For
// internal boundaries don't add it.
p = new Point(vertex.x, vertex.y);
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
// Add midpoint of start triangles' edge.
torg = f.Org();
tdest = f.Dest();
p = new Point((torg.x + tdest.x) / 2, (torg.y + tdest.y) / 2);
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
// repeat ... until f = f_init
do
{
// Call Lffnext the line going through the circumcenters of f and f_next
cc_f = points[f.tri.id];
if (f_next.tri.id == TriangleNetMesh.DUMMY)
{
if (!f.tri.infected)
{
// Add last circumcenter
vpoints.Add(cc_f);
}
// Add midpoint of last triangles' edge (chances are it has already
// been added, so post process cell to remove duplicates???)
torg = f.Org();
tapex = f.Apex();
p = new Point((torg.x + tapex.x) / 2, (torg.y + tapex.y) / 2);
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
break;
}
cc_f_next = points[f_next.tri.id];
// if f is tagged non-blind then
if (!f.tri.infected)
{
// Insert the circumcenter of f into P
vpoints.Add(cc_f);
if (f_next.tri.infected)
{
// Call S_fnext the constrained edge blinding f_next
sfn.seg = subsegMap[f_next.tri.hash];
// Insert point Lf,f_next /\ Sf_next into P
if (SegmentsIntersect(sfn.Org(), sfn.Dest(), cc_f, cc_f_next, out p, true))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
}
}
else
{
// Call Sf the constrained edge blinding f
sf.seg = subsegMap[f.tri.hash];
sorg = sf.Org();
sdest = sf.Dest();
// if f_next is tagged non-blind then
if (!f_next.tri.infected)
{
tdest = f.Dest();
tapex = f.Apex();
// Both circumcenters lie on the blinded side, but we
// have to add the intersection with the segment.
// Center of f edge dest->apex
Point bisec = new Point((tdest.x + tapex.x) / 2, (tdest.y + tapex.y) / 2);
// Find intersection of seg with line through f's bisector and circumcenter
if (SegmentsIntersect(sorg, sdest, bisec, cc_f, out p, false))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
// Insert point Lf,f_next /\ Sf into P
if (SegmentsIntersect(sorg, sdest, cc_f, cc_f_next, out p, true))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
}
else
{
// Call Sf_next the constrained edge blinding f_next
sfn.seg = subsegMap[f_next.tri.hash];
// if Sf != Sf_next then
if (!sf.Equal(sfn))
{
// Insert Lf,fnext /\ Sf and Lf,fnext /\ Sfnext into P
if (SegmentsIntersect(sorg, sdest, cc_f, cc_f_next, out p, true))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
if (SegmentsIntersect(sfn.Org(), sfn.Dest(), cc_f, cc_f_next, out p, true))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
}
else
{
// Both circumcenters lie on the blinded side, but we
// have to add the intersection with the segment.
// Center of f_next edge org->dest
Point bisec = new Point((torg.x + tdest.x) / 2, (torg.y + tdest.y) / 2);
// Find intersection of seg with line through f_next's bisector and circumcenter
if (SegmentsIntersect(sorg, sdest, bisec, cc_f_next, out p, false))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
}
}
}
// f <- f_next
f_next.Copy(ref f);
// Call f_next the next triangle counterclockwise around x
f_next.Onext();
}while (!f.Equals(f_init));
// Output: Bounded Voronoi cell of x in counterclockwise order.
region.Add(vpoints);
}
private void ConstructCell(Vertex vertex)
{
VoronoiRegion region = new VoronoiRegion(vertex);
regions.Add(region);
Otri f = default(Otri);
Otri f_init = default(Otri);
Otri f_next = default(Otri);
Osub sf = default(Osub);
Osub sfn = default(Osub);
Point cc_f, cc_f_next, p;
int n = _TriangleNetMesh.triangles.Count;
// Call P the polygon (cell) in construction
List <Point> vpoints = new List <Point>();
// Call f_init a triangle incident to x
vertex.tri.Copy(ref f_init);
if (f_init.Org() != vertex)
{
throw new Exception("ConstructCell: inconsistent topology.");
}
// Let f be initialized to f_init
f_init.Copy(ref f);
// Call f_next the next triangle counterclockwise around x
f_init.Onext(ref f_next);
// repeat ... until f = f_init
do
{
// Call Lffnext the line going through the circumcenters of f and f_next
cc_f = points[f.tri.id];
cc_f_next = points[f_next.tri.id];
// if f is tagged non-blind then
if (!f.tri.infected)
{
// Insert the circumcenter of f into P
vpoints.Add(cc_f);
if (f_next.tri.infected)
{
// Call S_fnext the constrained edge blinding f_next
sfn.seg = subsegMap[f_next.tri.hash];
// Insert point Lf,f_next /\ Sf_next into P
if (SegmentsIntersect(sfn.Org(), sfn.Dest(), cc_f, cc_f_next, out p, true))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
}
}
else
{
// Call Sf the constrained edge blinding f
sf.seg = subsegMap[f.tri.hash];
// if f_next is tagged non-blind then
if (!f_next.tri.infected)
{
// Insert point Lf,f_next /\ Sf into P
if (SegmentsIntersect(sf.Org(), sf.Dest(), cc_f, cc_f_next, out p, true))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
}
else
{
// Call Sf_next the constrained edge blinding f_next
sfn.seg = subsegMap[f_next.tri.hash];
// if Sf != Sf_next then
if (!sf.Equal(sfn))
{
// Insert Lf,fnext /\ Sf and Lf,fnext /\ Sfnext into P
if (SegmentsIntersect(sf.Org(), sf.Dest(), cc_f, cc_f_next, out p, true))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
if (SegmentsIntersect(sfn.Org(), sfn.Dest(), cc_f, cc_f_next, out p, true))
{
p.id = n + segIndex++;
segPoints.Add(p);
vpoints.Add(p);
}
}
}
}
// f <- f_next
f_next.Copy(ref f);
// Call f_next the next triangle counterclockwise around x
f_next.Onext();
}while (!f.Equals(f_init));
// Output: Bounded Voronoi cell of x in counterclockwise order.
region.Add(vpoints);
}
/// <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);
}
/// <summary>
/// Split all the encroached subsegments.
/// </summary>
/// <param name="triflaws">A flag that specifies whether one should take
/// note of new bad triangles that result from inserting vertices to repair
/// encroached subsegments.</param>
/// <remarks>
/// Each encroached subsegment is repaired by splitting it - inserting a
/// vertex at or near its midpoint. Newly inserted vertices may encroach
/// upon other subsegments; these are also repaired.
/// </remarks>
private void SplitEncSegs(bool triflaws)
{
Otri enctri = default(Otri);
Otri testtri = default(Otri);
Osub testsh = default(Osub);
Osub currentenc = default(Osub);
BadSubseg seg;
Vertex eorg, edest, eapex;
Vertex newvertex;
InsertVertexResult success;
float segmentlength, nearestpoweroftwo;
float split;
float multiplier, divisor;
bool acuteorg, acuteorg2, acutedest, acutedest2;
// Note that steinerleft == -1 if an unlimited number
// of Steiner points is allowed.
while (badsubsegs.Count > 0)
{
if (mesh.steinerleft == 0)
{
break;
}
seg = badsubsegs.Dequeue();
currentenc = seg.encsubseg;
eorg = currentenc.Org();
edest = currentenc.Dest();
// Make sure that this segment is still the same segment it was
// when it was determined to be encroached. If the segment was
// enqueued multiple times (because several newly inserted
// vertices encroached it), it may have already been split.
if (!Osub.IsDead(currentenc.seg) && (eorg == seg.subsegorg) && (edest == seg.subsegdest))
{
// To decide where to split a segment, we need to know if the
// segment shares an endpoint with an adjacent segment.
// The concern is that, if we simply split every encroached
// segment in its center, two adjacent segments with a small
// angle between them might lead to an infinite loop; each
// vertex added to split one segment will encroach upon the
// other segment, which must then be split with a vertex that
// will encroach upon the first segment, and so on forever.
// To avoid this, imagine a set of concentric circles, whose
// radii are powers of two, about each segment endpoint.
// These concentric circles determine where the segment is
// split. (If both endpoints are shared with adjacent
// segments, split the segment in the middle, and apply the
// concentric circles for later splittings.)
// Is the origin shared with another segment?
currentenc.TriPivot(ref enctri);
enctri.Lnext(ref testtri);
testtri.SegPivot(ref testsh);
acuteorg = testsh.seg != Mesh.dummysub;
// Is the destination shared with another segment?
testtri.LnextSelf();
testtri.SegPivot(ref testsh);
acutedest = testsh.seg != Mesh.dummysub;
// If we're using Chew's algorithm (rather than Ruppert's)
// to define encroachment, delete free vertices from the
// subsegment's diametral circle.
if (!behavior.ConformingDelaunay && !acuteorg && !acutedest)
{
eapex = enctri.Apex();
while ((eapex.type == VertexType.FreeVertex) &&
((eorg.x - eapex.x) * (edest.x - eapex.x) +
(eorg.y - eapex.y) * (edest.y - eapex.y) < 0.0))
{
mesh.DeleteVertex(ref testtri);
currentenc.TriPivot(ref enctri);
eapex = enctri.Apex();
enctri.Lprev(ref testtri);
}
}
// Now, check the other side of the segment, if there's a triangle there.
enctri.Sym(ref testtri);
if (testtri.triangle != Mesh.dummytri)
{
// Is the destination shared with another segment?
testtri.LnextSelf();
testtri.SegPivot(ref testsh);
acutedest2 = testsh.seg != Mesh.dummysub;
acutedest = acutedest || acutedest2;
// Is the origin shared with another segment?
testtri.LnextSelf();
testtri.SegPivot(ref testsh);
acuteorg2 = testsh.seg != Mesh.dummysub;
acuteorg = acuteorg || acuteorg2;
// Delete free vertices from the subsegment's diametral circle.
if (!behavior.ConformingDelaunay && !acuteorg2 && !acutedest2)
{
eapex = testtri.Org();
while ((eapex.type == VertexType.FreeVertex) &&
((eorg.x - eapex.x) * (edest.x - eapex.x) +
(eorg.y - eapex.y) * (edest.y - eapex.y) < 0.0))
{
mesh.DeleteVertex(ref testtri);
enctri.Sym(ref testtri);
eapex = testtri.Apex();
testtri.LprevSelf();
}
}
}
// Use the concentric circles if exactly one endpoint is shared
// with another adjacent segment.
if (acuteorg || acutedest)
{
segmentlength = UnityEngine.Mathf.Sqrt((edest.x - eorg.x) * (edest.x - eorg.x) +
(edest.y - eorg.y) * (edest.y - eorg.y));
// Find the power of two that most evenly splits the segment.
// The worst case is a 2:1 ratio between subsegment lengths.
nearestpoweroftwo = 1.0f;
while (segmentlength > 3.0f * nearestpoweroftwo)
{
nearestpoweroftwo *= 2.0f;
}
while (segmentlength < 1.5f * nearestpoweroftwo)
{
nearestpoweroftwo *= 0.5f;
}
// Where do we split the segment?
split = nearestpoweroftwo / segmentlength;
if (acutedest)
{
split = 1.0f - split;
}
}
else
{
// If we're not worried about adjacent segments, split
// this segment in the middle.
split = 0.5f;
}
// Create the new vertex (interpolate coordinates).
newvertex = new Vertex(
eorg.x + split * (edest.x - eorg.x),
eorg.y + split * (edest.y - eorg.y),
currentenc.Mark(),
mesh.nextras);
newvertex.type = VertexType.SegmentVertex;
newvertex.hash = mesh.hash_vtx++;
newvertex.id = newvertex.hash;
mesh.vertices.Add(newvertex.hash, newvertex);
// Interpolate attributes.
for (int i = 0; i < mesh.nextras; i++)
{
newvertex.attributes[i] = eorg.attributes[i]
+ split * (edest.attributes[i] - eorg.attributes[i]);
}
if (!Behavior.NoExact)
{
// Roundoff in the above calculation may yield a 'newvertex'
// that is not precisely collinear with 'eorg' and 'edest'.
// Improve collinearity by one step of iterative refinement.
multiplier = Primitives.CounterClockwise(eorg, edest, newvertex);
divisor = ((eorg.x - edest.x) * (eorg.x - edest.x) +
(eorg.y - edest.y) * (eorg.y - edest.y));
if ((multiplier != 0.0) && (divisor != 0.0))
{
multiplier = multiplier / divisor;
// Watch out for NANs.
if (!float.IsNaN(multiplier))
{
newvertex.x += multiplier * (edest.y - eorg.y);
newvertex.y += multiplier * (eorg.x - edest.x);
}
}
}
// Check whether the new vertex lies on an endpoint.
if (((newvertex.x == eorg.x) && (newvertex.y == eorg.y)) ||
((newvertex.x == edest.x) && (newvertex.y == edest.y)))
{
logger.Error("Ran out of precision: I attempted to split a"
+ " segment to a smaller size than can be accommodated by"
+ " the finite precision of floating point arithmetic.",
"Quality.SplitEncSegs()");
throw new Exception("Ran out of precision");
}
// Insert the splitting vertex. This should always succeed.
success = mesh.InsertVertex(newvertex, ref enctri, ref currentenc, true, triflaws);
if ((success != InsertVertexResult.Successful) && (success != InsertVertexResult.Encroaching))
{
logger.Error("Failure to split a segment.", "Quality.SplitEncSegs()");
throw new Exception("Failure to split a segment.");
}
if (mesh.steinerleft > 0)
{
mesh.steinerleft--;
}
// Check the two new subsegments to see if they're encroached.
CheckSeg4Encroach(ref currentenc);
currentenc.NextSelf();
CheckSeg4Encroach(ref currentenc);
}
// Set subsegment's origin to NULL. This makes it possible to detect dead
// badsubsegs when traversing the list of all badsubsegs.
seg.subsegorg = null;
}
}
/// <summary>
/// Check a subsegment to see if it is encroached; add it to the list if it is.
/// </summary>
/// <param name="testsubseg">The subsegment to check.</param>
/// <returns>Returns a nonzero value if the subsegment is encroached.</returns>
/// <remarks>
/// A subsegment is encroached if there is a vertex in its diametral lens.
/// For Ruppert's algorithm (-D switch), the "diametral lens" is the
/// diametral circle. For Chew's algorithm (default), the diametral lens is
/// just big enough to enclose two isosceles triangles whose bases are the
/// subsegment. Each of the two isosceles triangles has two angles equal
/// to 'b.minangle'.
///
/// Chew's algorithm does not require diametral lenses at all--but they save
/// time. Any vertex inside a subsegment's diametral lens implies that the
/// triangle adjoining the subsegment will be too skinny, so it's only a
/// matter of time before the encroaching vertex is deleted by Chew's
/// algorithm. It's faster to simply not insert the doomed vertex in the
/// first place, which is why I use diametral lenses with Chew's algorithm.
/// </remarks>
public int CheckSeg4Encroach(ref Osub testsubseg)
{
Otri neighbortri = default(Otri);
Osub testsym = default(Osub);
BadSubseg encroachedseg;
float dotproduct;
int encroached;
int sides;
Vertex eorg, edest, eapex;
encroached = 0;
sides = 0;
eorg = testsubseg.Org();
edest = testsubseg.Dest();
// Check one neighbor of the subsegment.
testsubseg.TriPivot(ref neighbortri);
// Does the neighbor exist, or is this a boundary edge?
if (neighbortri.triangle != Mesh.dummytri)
{
sides++;
// Find a vertex opposite this subsegment.
eapex = neighbortri.Apex();
// Check whether the apex is in the diametral lens of the subsegment
// (the diametral circle if 'conformdel' is set). A dot product
// of two sides of the triangle is used to check whether the angle
// at the apex is greater than (180 - 2 'minangle') degrees (for
// lenses; 90 degrees for diametral circles).
dotproduct = (eorg.x - eapex.x) * (edest.x - eapex.x) +
(eorg.y - eapex.y) * (edest.y - eapex.y);
if (dotproduct < 0.0)
{
if (behavior.ConformingDelaunay ||
(dotproduct * dotproduct >=
(2.0 * behavior.goodAngle - 1.0) * (2.0 * behavior.goodAngle - 1.0) *
((eorg.x - eapex.x) * (eorg.x - eapex.x) +
(eorg.y - eapex.y) * (eorg.y - eapex.y)) *
((edest.x - eapex.x) * (edest.x - eapex.x) +
(edest.y - eapex.y) * (edest.y - eapex.y))))
{
encroached = 1;
}
}
}
// Check the other neighbor of the subsegment.
testsubseg.Sym(ref testsym);
testsym.TriPivot(ref neighbortri);
// Does the neighbor exist, or is this a boundary edge?
if (neighbortri.triangle != Mesh.dummytri)
{
sides++;
// Find the other vertex opposite this subsegment.
eapex = neighbortri.Apex();
// Check whether the apex is in the diametral lens of the subsegment
// (or the diametral circle, if 'conformdel' is set).
dotproduct = (eorg.x - eapex.x) * (edest.x - eapex.x) +
(eorg.y - eapex.y) * (edest.y - eapex.y);
if (dotproduct < 0.0)
{
if (behavior.ConformingDelaunay ||
(dotproduct * dotproduct >=
(2.0 * behavior.goodAngle - 1.0) * (2.0 * behavior.goodAngle - 1.0) *
((eorg.x - eapex.x) * (eorg.x - eapex.x) +
(eorg.y - eapex.y) * (eorg.y - eapex.y)) *
((edest.x - eapex.x) * (edest.x - eapex.x) +
(edest.y - eapex.y) * (edest.y - eapex.y))))
{
encroached += 2;
}
}
}
if (encroached > 0 && (behavior.NoBisect == 0 || ((behavior.NoBisect == 1) && (sides == 2))))
{
// Add the subsegment to the list of encroached subsegments.
// Be sure to get the orientation right.
encroachedseg = new BadSubseg();
if (encroached == 1)
{
encroachedseg.encsubseg = testsubseg;
encroachedseg.subsegorg = eorg;
encroachedseg.subsegdest = edest;
}
else
{
encroachedseg.encsubseg = testsym;
encroachedseg.subsegorg = edest;
encroachedseg.subsegdest = eorg;
}
badsubsegs.Enqueue(encroachedseg);
}
return(encroached);
}
private void WriteMesh(TriangleNetMesh triangleNetMesh, bool skip)
{
// Mesh may have changed, but we choose to skip
if (triangles == triangleNetMesh.triangles.Count && skip)
{
return;
}
// Header line
stream.WriteLine("#!M{0}", iteration++);
Vertex p1, p2, p3;
if (VerticesChanged(triangleNetMesh))
{
HashVertices(triangleNetMesh);
// Number of vertices.
stream.WriteLine("{0}", triangleNetMesh.vertices.Count);
foreach (var v in triangleNetMesh.vertices.Values)
{
// Vertex number, x and y coordinates and marker.
stream.WriteLine("{0} {1} {2} {3}", v.id, v.x.ToString(nfi), v.y.ToString(nfi), v.label);
}
}
else
{
stream.WriteLine("0");
}
// Number of segments.
stream.WriteLine("{0}", triangleNetMesh.subsegs.Count);
Osub subseg = default(Osub);
subseg.orient = 0;
foreach (var item in triangleNetMesh.subsegs.Values)
{
if (item.hash <= 0)
{
continue;
}
subseg.seg = item;
p1 = subseg.Org();
p2 = subseg.Dest();
// Segment number, indices of its two endpoints, and marker.
stream.WriteLine("{0} {1} {2} {3}", subseg.seg.hash, p1.id, p2.id, subseg.seg.boundary);
}
Otri tri = default(Otri), trisym = default(Otri);
tri.orient = 0;
int n1, n2, n3, h1, h2, h3;
// Number of triangles.
stream.WriteLine("{0}", triangleNetMesh.triangles.Count);
foreach (var item in triangleNetMesh.triangles)
{
tri.tri = item;
p1 = tri.Org();
p2 = tri.Dest();
p3 = tri.Apex();
h1 = (p1 == null) ? -1 : p1.id;
h2 = (p2 == null) ? -1 : p2.id;
h3 = (p3 == null) ? -1 : p3.id;
// Triangle number, indices for three vertices.
stream.Write("{0} {1} {2} {3}", tri.tri.hash, h1, h2, h3);
tri.orient = 1;
tri.Sym(ref trisym);
n1 = trisym.tri.hash;
tri.orient = 2;
tri.Sym(ref trisym);
n2 = trisym.tri.hash;
tri.orient = 0;
tri.Sym(ref trisym);
n3 = trisym.tri.hash;
// Neighboring triangle numbers.
stream.WriteLine(" {0} {1} {2}", n1, n2, n3);
}
}
/// <summary>
/// Write the segments and holes to a .poly file.
/// </summary>
/// <param name="mesh">Data source.</param>
/// <param name="filename">File name.</param>
/// <param name="writeNodes">Write nodes into this file.</param>
/// <remarks>If the nodes should not be written into this file,
/// make sure a .node file was written before, so that the nodes
/// are numbered right.</remarks>
public void WritePoly(Mesh mesh, string filename, bool writeNodes)
{
Osub subseg = default(Osub);
Vertex pt1, pt2;
bool useBoundaryMarkers = mesh.behavior.UseBoundaryMarkers;
using (var writer = new StreamWriter(filename))
{
if (writeNodes)
{
// Write nodes to this file.
WriteNodes(writer, mesh);
}
else
{
// The zero indicates that the vertices are in a separate .node file.
// Followed by number of dimensions, number of vertex attributes,
// and number of boundary markers (zero or one).
writer.WriteLine("0 {0} {1} {2}", mesh.mesh_dim, mesh.nextras,
useBoundaryMarkers ? "1" : "0");
}
// Number of segments, number of boundary markers (zero or one).
writer.WriteLine("{0} {1}", mesh.subsegs.Count,
useBoundaryMarkers ? "1" : "0");
subseg.orient = 0;
int j = 0;
foreach (var item in mesh.subsegs.Values)
{
subseg.seg = item;
pt1 = subseg.Org();
pt2 = subseg.Dest();
// Segment number, indices of its two endpoints, and possibly a marker.
if (useBoundaryMarkers)
{
writer.WriteLine("{0} {1} {2} {3}", j, pt1.id, pt2.id, subseg.seg.boundary);
}
else
{
writer.WriteLine("{0} {1} {2}", j, pt1.id, pt2.id);
}
j++;
}
// Holes
j = 0;
writer.WriteLine("{0}", mesh.holes.Count);
foreach (var hole in mesh.holes)
{
writer.WriteLine("{0} {1} {2}", j++, hole.X.ToString(nfi), hole.Y.ToString(nfi));
}
// Regions
if (mesh.regions.Count > 0)
{
j = 0;
writer.WriteLine("{0}", mesh.regions.Count);
foreach (var region in mesh.regions)
{
writer.WriteLine("{0} {1} {2} {3}", j, region.point.X.ToString(nfi),
region.point.Y.ToString(nfi), region.id);
j++;
}
}
}
}
private void WriteMesh(Mesh mesh, bool skip)
{
Vertex vertex;
Vertex vertex1;
if (this.triangles == mesh.triangles.Count & skip)
{
return;
}
StreamWriter streamWriter = this.stream;
int num = this.iteration;
this.iteration = num + 1;
streamWriter.WriteLine("#!M{0}", num);
if (!this.VerticesChanged(mesh))
{
this.stream.WriteLine("0");
}
else
{
this.HashVertices(mesh);
this.stream.WriteLine("{0}", mesh.vertices.Count);
foreach (Vertex value in mesh.vertices.Values)
{
this.stream.WriteLine("{0} {1} {2} {3}", new object[] { value.hash, value.x.ToString(DebugWriter.nfi), value.y.ToString(DebugWriter.nfi), value.mark });
}
}
this.stream.WriteLine("{0}", mesh.subsegs.Count);
Osub osub = new Osub()
{
orient = 0
};
foreach (Segment segment in mesh.subsegs.Values)
{
if (segment.hash <= 0)
{
continue;
}
osub.seg = segment;
vertex = osub.Org();
vertex1 = osub.Dest();
this.stream.WriteLine("{0} {1} {2} {3}", new object[] { osub.seg.hash, vertex.hash, vertex1.hash, osub.seg.boundary });
}
Otri otri = new Otri();
Otri otri1 = new Otri();
otri.orient = 0;
this.stream.WriteLine("{0}", mesh.triangles.Count);
foreach (Triangle triangle in mesh.triangles.Values)
{
otri.triangle = triangle;
vertex = otri.Org();
vertex1 = otri.Dest();
Vertex vertex2 = otri.Apex();
int num1 = (vertex == null ? -1 : vertex.hash);
int num2 = (vertex1 == null ? -1 : vertex1.hash);
int num3 = (vertex2 == null ? -1 : vertex2.hash);
this.stream.Write("{0} {1} {2} {3}", new object[] { otri.triangle.hash, num1, num2, num3 });
otri.orient = 1;
otri.Sym(ref otri1);
int num4 = otri1.triangle.hash;
otri.orient = 2;
otri.Sym(ref otri1);
int num5 = otri1.triangle.hash;
otri.orient = 0;
otri.Sym(ref otri1);
int num6 = otri1.triangle.hash;
this.stream.WriteLine(" {0} {1} {2}", num4, num5, num6);
}
}
private void SplitEncSegs(bool triflaws)
{
Vertex vertex;
double num;
Otri otri = new Otri();
Otri otri1 = new Otri();
Osub osub = new Osub();
Osub osub1 = new Osub();
while (this.badsubsegs.Count > 0 && this.mesh.steinerleft != 0)
{
BadSubseg badSubseg = this.badsubsegs.Dequeue();
osub1 = badSubseg.encsubseg;
Vertex vertex1 = osub1.Org();
Vertex vertex2 = osub1.Dest();
if (!Osub.IsDead(osub1.seg) && vertex1 == badSubseg.subsegorg && vertex2 == badSubseg.subsegdest)
{
osub1.TriPivot(ref otri);
otri.Lnext(ref otri1);
otri1.SegPivot(ref osub);
bool flag = osub.seg != Mesh.dummysub;
otri1.LnextSelf();
otri1.SegPivot(ref osub);
bool flag1 = osub.seg != Mesh.dummysub;
if (!this.behavior.ConformingDelaunay && !flag && !flag1)
{
vertex = otri.Apex();
while (vertex.type == VertexType.FreeVertex && (vertex1.x - vertex.x) * (vertex2.x - vertex.x) + (vertex1.y - vertex.y) * (vertex2.y - vertex.y) < 0)
{
this.mesh.DeleteVertex(ref otri1);
osub1.TriPivot(ref otri);
vertex = otri.Apex();
otri.Lprev(ref otri1);
}
}
otri.Sym(ref otri1);
if (otri1.triangle != Mesh.dummytri)
{
otri1.LnextSelf();
otri1.SegPivot(ref osub);
bool flag2 = osub.seg != Mesh.dummysub;
flag1 = flag1 | flag2;
otri1.LnextSelf();
otri1.SegPivot(ref osub);
bool flag3 = osub.seg != Mesh.dummysub;
flag = flag | flag3;
if (!this.behavior.ConformingDelaunay && !flag3 && !flag2)
{
vertex = otri1.Org();
while (vertex.type == VertexType.FreeVertex && (vertex1.x - vertex.x) * (vertex2.x - vertex.x) + (vertex1.y - vertex.y) * (vertex2.y - vertex.y) < 0)
{
this.mesh.DeleteVertex(ref otri1);
otri.Sym(ref otri1);
vertex = otri1.Apex();
otri1.LprevSelf();
}
}
}
if (!(flag | flag1))
{
num = 0.5;
}
else
{
double num1 = Math.Sqrt((vertex2.x - vertex1.x) * (vertex2.x - vertex1.x) + (vertex2.y - vertex1.y) * (vertex2.y - vertex1.y));
double num2 = 1;
while (num1 > 3 * num2)
{
num2 = num2 * 2;
}
while (num1 < 1.5 * num2)
{
num2 = num2 * 0.5;
}
num = num2 / num1;
if (flag1)
{
num = 1 - num;
}
}
Vertex vertex3 = new Vertex(vertex1.x + num * (vertex2.x - vertex1.x), vertex1.y + num * (vertex2.y - vertex1.y), osub1.Mark(), this.mesh.nextras)
{
type = VertexType.SegmentVertex
};
Mesh mesh = this.mesh;
int hashVtx = mesh.hash_vtx;
mesh.hash_vtx = hashVtx + 1;
vertex3.hash = hashVtx;
vertex3.id = vertex3.hash;
this.mesh.vertices.Add(vertex3.hash, vertex3);
for (int i = 0; i < this.mesh.nextras; i++)
{
vertex3.attributes[i] = vertex1.attributes[i] + num * (vertex2.attributes[i] - vertex1.attributes[i]);
}
if (!Behavior.NoExact)
{
double num3 = Primitives.CounterClockwise(vertex1, vertex2, vertex3);
double num4 = (vertex1.x - vertex2.x) * (vertex1.x - vertex2.x) + (vertex1.y - vertex2.y) * (vertex1.y - vertex2.y);
if (num3 != 0 && num4 != 0)
{
num3 = num3 / num4;
if (!double.IsNaN(num3))
{
Vertex vertex4 = vertex3;
vertex4.x = vertex4.x + num3 * (vertex2.y - vertex1.y);
Vertex vertex5 = vertex3;
vertex5.y = vertex5.y + num3 * (vertex1.x - vertex2.x);
}
}
}
if (vertex3.x == vertex1.x && vertex3.y == vertex1.y || vertex3.x == vertex2.x && vertex3.y == vertex2.y)
{
this.logger.Error("Ran out of precision: I attempted to split a segment to a smaller size than can be accommodated by the finite precision of floating point arithmetic.", "Quality.SplitEncSegs()");
throw new Exception("Ran out of precision");
}
InsertVertexResult insertVertexResult = this.mesh.InsertVertex(vertex3, ref otri, ref osub1, true, triflaws);
if (insertVertexResult != InsertVertexResult.Successful && insertVertexResult != InsertVertexResult.Encroaching)
{
this.logger.Error("Failure to split a segment.", "Quality.SplitEncSegs()");
throw new Exception("Failure to split a segment.");
}
if (this.mesh.steinerleft > 0)
{
Mesh mesh1 = this.mesh;
mesh1.steinerleft = mesh1.steinerleft - 1;
}
this.CheckSeg4Encroach(ref osub1);
osub1.NextSelf();
this.CheckSeg4Encroach(ref osub1);
}
badSubseg.subsegorg = null;
}
}
public static void WritePoly(Mesh mesh, string filename, bool writeNodes)
{
double x;
Osub osub = new Osub();
bool useBoundaryMarkers = mesh.behavior.UseBoundaryMarkers;
using (StreamWriter streamWriter = new StreamWriter(new FileStream(filename, FileMode.Create)))
{
if (!writeNodes)
{
streamWriter.WriteLine("0 {0} {1} {2}", mesh.mesh_dim, mesh.nextras, (useBoundaryMarkers ? "1" : "0"));
}
else
{
FileWriter.WriteNodes(streamWriter, mesh);
}
streamWriter.WriteLine("{0} {1}", mesh.subsegs.Count, (useBoundaryMarkers ? "1" : "0"));
osub.orient = 0;
int num = 0;
foreach (Segment value in mesh.subsegs.Values)
{
osub.seg = value;
Vertex vertex = osub.Org();
Vertex vertex1 = osub.Dest();
if (!useBoundaryMarkers)
{
streamWriter.WriteLine("{0} {1} {2}", num, vertex.id, vertex1.id);
}
else
{
streamWriter.WriteLine("{0} {1} {2} {3}", new object[] { num, vertex.id, vertex1.id, osub.seg.boundary });
}
num++;
}
num = 0;
streamWriter.WriteLine("{0}", mesh.holes.Count);
foreach (Point hole in mesh.holes)
{
int num1 = num;
num = num1 + 1;
object obj = num1;
x = hole.X;
string str = x.ToString(FileWriter.nfi);
x = hole.Y;
streamWriter.WriteLine("{0} {1} {2}", obj, str, x.ToString(FileWriter.nfi));
}
if (mesh.regions.Count > 0)
{
num = 0;
streamWriter.WriteLine("{0}", mesh.regions.Count);
foreach (RegionPointer region in mesh.regions)
{
object[] objArray = new object[] { num, null, null, null };
x = region.point.X;
objArray[1] = x.ToString(FileWriter.nfi);
x = region.point.Y;
objArray[2] = x.ToString(FileWriter.nfi);
objArray[3] = region.id;
streamWriter.WriteLine("{0} {1} {2} {3}", objArray);
num++;
}
}
}
}
/// <summary>
/// Finds the adjacencies between triangles and subsegments.
/// </summary>
private static void SetSegments(Mesh mesh, Polygon polygon, List <Otri>[] vertexarray)
{
Otri checktri = default(Otri);
Otri nexttri; // Triangle
TVertex checkdest;
Otri checkneighbor = default(Otri);
Osub subseg = default(Osub);
Otri prevlink; // Triangle
TVertex tmp;
TVertex sorg, sdest;
bool notfound;
//bool segmentmarkers = false;
int boundmarker;
int aroundvertex;
int i;
int hullsize = 0;
// Prepare to count the boundary edges.
if (mesh.behavior.Poly)
{
// Link the segments to their neighboring triangles.
boundmarker = 0;
i = 0;
foreach (var item in mesh.subsegs.Values)
{
subseg.seg = item;
sorg = polygon.Segments[i].GetVertex(0);
sdest = polygon.Segments[i].GetVertex(1);
boundmarker = polygon.Segments[i].Label;
if ((sorg.id < 0 || sorg.id >= mesh.invertices) || (sdest.id < 0 || sdest.id >= mesh.invertices))
{
Log.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;
subseg.SetOrg(sorg);
subseg.SetDest(sdest);
subseg.SetSegOrg(sorg);
subseg.SetSegDest(sdest);
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 = subseg.orient == 1 ? sorg.id : sdest.id;
int index = vertexarray[aroundvertex].Count - 1;
// Look for triangles having this vertex.
prevlink = vertexarray[aroundvertex][index];
nexttri = vertexarray[aroundvertex][index];
checktri = nexttri;
tmp = 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.tri.id != Mesh.DUMMY))
{
checkdest = checktri.Dest();
if (tmp == 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.tri.id == Mesh.DUMMY)
{
// 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.tri.id != Mesh.DUMMY)
{
// 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(mesh.dummysub);
checktri.Sym(ref checkneighbor);
if (checkneighbor.tri.id == Mesh.DUMMY)
{
mesh.InsertSubseg(ref checktri, 1);
hullsize++;
}
checktri = nexttri;
}
}
mesh.hullsize = hullsize;
}
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);
}
