void _addConstraints(ref DelaunayTriangleBuffer tbuffer, PointList pl, std_vector <int> segmentListIndices)
{
std_vector <DelaunaySegment> segList = new std_vector <DelaunaySegment>();
//Utils::log("a co");
//for (DelaunayTriangleBuffer::iterator it = tbuffer.begin(); it!=tbuffer.end();it++)
// Utils::log(it->debugDescription());
// First, list all the segments that are not already in one of the delaunay triangles
//for (std::vector<int>::const_iterator it2 = segmentListIndices.begin(); it2 != segmentListIndices.end(); it2++)
for (int i = 0; i < segmentListIndices.Count; i++)
{
//int i1 = *it2;
int i1 = segmentListIndices[i];
//it2++;
i++;
//int i2 = *it2;
int i2 = segmentListIndices[i];
bool isAlreadyIn = false;
//for (DelaunayTriangleBuffer::iterator it = tbuffer.begin(); it!=tbuffer.end(); ++it)
foreach (var it in tbuffer)
{
if (it.containsSegment(i1, i2))
{
isAlreadyIn = true;
break;
}
}
// only do something for segments not already in DT
if (!isAlreadyIn)
{
segList.push_back(new DelaunaySegment(i1, i2));
}
}
// Re-Triangulate according to the new segments
//for (std::vector<DelaunaySegment>::iterator itSeg=segList.begin(); itSeg!=segList.end(); itSeg++)
for (int ii = segList.Count - 1; ii >= 0; ii--)
{
DelaunaySegment itSeg = segList[ii];
//Utils::log("itseg " + StringConverter::toString(itSeg->i1) + "," + StringConverter::toString(itSeg->i2) + " " + StringConverter::toString(pl[itSeg->i1]) + "," + StringConverter::toString(pl[itSeg->i2]));
// Remove all triangles intersecting the segment and keep a list of outside edges
std_set <DelaunaySegment> segments = new std_set <DelaunaySegment>();
Segment2D seg1 = new Segment2D(pl[itSeg.i1], pl[itSeg.i2]);
//for (DelaunayTriangleBuffer::iterator itTri = tbuffer.begin(); itTri!=tbuffer.end(); )
for (int jj = tbuffer.Count - 1; jj >= 0; jj--)
{
Triangle itTri = tbuffer.getElement(jj).Value;
bool isTriangleIntersected = false;
bool isDegenerate = false;
int degenIndex;
for (int i = 0; i < 3; i++)
{
//Early out if 2 points are in fact the same
if (itTri.i[i] == itSeg.i1 || itTri.i[i] == itSeg.i2 || itTri.i[(i + 1) % 3] == itSeg.i1 || itTri.i[(i + 1) % 3] == itSeg.i2)
{
if (itTri.isDegenerate())
{
if (itTri.i[i] == itSeg.i1 || itTri.i[(i + 1) % 3] == itSeg.i1)
{
degenIndex = itSeg.i1;
}
else if (itTri.i[i] == itSeg.i2 || itTri.i[(i + 1) % 3] == itSeg.i2)
{
degenIndex = itSeg.i2;
}
isTriangleIntersected = true;
isDegenerate = true;
}
else
{
continue;
}
}
Segment2D seg2 = new Segment2D(itTri.p(i), itTri.p((i + 1) % 3));
if (seg1.intersects(seg2))
{
isTriangleIntersected = true;
break;
}
}
if (isTriangleIntersected)
{
//if (isDegenerate)
//Utils::log("degen " + itTri->debugDescription());
for (int k = 0; k < 3; k++)
{
DelaunaySegment d1 = new DelaunaySegment(itTri.i[k], itTri.i[(k + 1) % 3]);
if (segments.find(d1) != segments.end())
{
segments.erase(d1);
}
else if (segments.find(d1.inverse()) != segments.end())
{
segments.erase(d1.inverse());
}
else
{
segments.insert(d1);
}
}
//itTri=tbuffer.erase(itTri);
tbuffer.erase(jj);
}
//else
// itTri++;
}
// Divide the list of points (coming from remaining segments) in 2 groups : "above" and "below"
std_vector <int> pointsAbove = new std_vector <int>();
std_vector <int> pointsBelow = new std_vector <int>();
int pt = itSeg.i1;
bool isAbove = true;
while (segments.size() > 0)
{
//find next point
//for (std::set<DelaunaySegment>::iterator it = segments.begin(); it!=segments.end(); ++it)
DelaunaySegment[] segments_all = segments.get_allocator();
for (int i = 0; i < segments_all.Length; ++i)
{
DelaunaySegment it = segments_all[i];//segments.find(i,true);
if (it.i1 == pt || it.i2 == pt)
{
//Utils::log("next " + StringConverter::toString(pt));
if (it.i1 == pt)
{
pt = it.i2;
}
else
{
pt = it.i1;
}
segments.erase(it);
if (pt == itSeg.i2)
{
isAbove = false;
}
else if (pt != itSeg.i1)
{
if (isAbove)
{
pointsAbove.push_back(pt);
}
else
{
pointsBelow.push_back(pt);
}
}
break;
}
}
}
// Recursively triangulate both polygons
_recursiveTriangulatePolygon(itSeg, pointsAbove, tbuffer, pl);
_recursiveTriangulatePolygon(itSeg.inverse(), pointsBelow, tbuffer, pl);
}
// Clean up segments outside of multishape
if (mRemoveOutside)
{
if (mMultiShapeToTriangulate != null && mMultiShapeToTriangulate.isClosed())
{
//for (DelaunayTriangleBuffer::iterator it = tbuffer.begin(); it!=tbuffer.end();)
for (int i = tbuffer.Count - 1; i >= 0; i--)
{
Triangle it = tbuffer.getElement(i).Value;
bool isTriangleOut = !mMultiShapeToTriangulate.isPointInside(it.getMidPoint());
if (isTriangleOut)
{
//it = tbuffer.erase(it);
tbuffer.erase(i);
}
//else
// ++it;
}
}
else if (mShapeToTriangulate != null && mShapeToTriangulate.isClosed())
{
//for (DelaunayTriangleBuffer::iterator it = tbuffer.begin(); it!=tbuffer.end();)
for (int i = tbuffer.Count - 1; i >= 0; i--)
{
Triangle it = tbuffer.getElement(i).Value;
bool isTriangleOut = !mShapeToTriangulate.isPointInside(it.getMidPoint());
if (isTriangleOut)
{
//it = tbuffer.erase(it);
tbuffer.erase(i);
}
//else
// ++it;
}
}
}
}
//
//ORIGINAL LINE: void delaunay(List<Ogre::Vector2>& pointList, LinkedList<Triangle>& tbuffer) const
void delaunay(PointList pointList, ref DelaunayTriangleBuffer tbuffer)
{
// Compute super triangle or insert manual super triangle
if (mManualSuperTriangle != null)
{
float maxTriangleSize = 0.0f;
//for (PointList::iterator it = pointList.begin(); it!=pointList.end(); ++it)
foreach (Vector2 it in pointList)
{
maxTriangleSize = max(maxTriangleSize, Math.Abs(it.x));
maxTriangleSize = max(maxTriangleSize, Math.Abs(it.y));
}
pointList.push_back(new Vector2(-3f * maxTriangleSize, -3f * maxTriangleSize));
pointList.push_back(new Vector2(3f * maxTriangleSize, -3f * maxTriangleSize));
pointList.push_back(new Vector2(0.0f, 3 * maxTriangleSize));
int maxTriangleIndex = pointList.size() - 3;
Triangle superTriangle = new Triangle(pointList);
superTriangle.i[0] = maxTriangleIndex;
superTriangle.i[1] = maxTriangleIndex + 1;
superTriangle.i[2] = maxTriangleIndex + 2;
tbuffer.push_back(superTriangle);
}
// Point insertion loop
for (int i = 0; i < pointList.size() - 3; i++)
{
//Utils::log("insert point " + StringConverter::toString(i));
//std::list<std::list<Triangle>::iterator> borderlineTriangles;
std_list <Triangle> borderlineTriangles = new std_list <Triangle>();
// Insert 1 point, find all triangles for which the point is in circumcircle
Vector2 p = pointList[i];
//std::set<DelaunaySegment> segments;
std_set <DelaunaySegment> segments = new std_set <DelaunaySegment>();
IEnumerator <Triangle> et = tbuffer.GetEnumerator();
//for (DelaunayTriangleBuffer::iterator it = tbuffer.begin(); it!=tbuffer.end();)
List <Triangle> need_erase = new List <Triangle>();
while (et.MoveNext())
{
Triangle it = et.Current;
Triangle.InsideType isInside = it.isPointInsideCircumcircle(p);
if (isInside == Triangle.InsideType.IT_INSIDE)
{
if (!it.isDegenerate())
{
//Utils::log("tri insie" + it->debugDescription());
for (int k = 0; k < 3; k++)
{
DelaunaySegment d1 = new DelaunaySegment(it.i[k], it.i[(k + 1) % 3]);
if (segments.find(d1) != segments.end())
{
segments.erase(d1);
}
else if (segments.find(d1.inverse()) != segments.end())
{
segments.erase(d1.inverse());
}
else
{
segments.insert(d1);
}
}
}
//it=tbuffer.erase(it);
need_erase.Add(it);
}
else if (isInside == Triangle.InsideType.IT_BORDERLINEOUTSIDE)
{
//Utils::log("tri borer " + it->debugDescription());
borderlineTriangles.push_back(it);
//++it;
}
else
{
//++it;
}
}
//do delete
foreach (var v in need_erase)
{
tbuffer.Remove(v);
}
// Robustification of the standard algorithm : if one triangle's circumcircle was borderline against the new point,
// test whether that triangle is intersected by new segments or not (normal situation : it should not)
// If intersected, the triangle is considered having the new point in its circumc
std_set <DelaunaySegment> copySegment = segments;
IEnumerator <Triangle> be = borderlineTriangles.GetEnumerator();
//for (std::list<std::list<Triangle>::iterator>::iterator itpTri = borderlineTriangles.begin(); itpTri!=borderlineTriangles.end(); itpTri++ )
while (be.MoveNext())
{
Triangle itpTri = be.Current;
//DelaunayTriangleBuffer::iterator itTri = *itpTri;
Triangle itTri = itpTri;
bool triRemoved = false;
//for (std::set<DelaunaySegment>::iterator it = copySegment.begin(); it!=copySegment.end() && !triRemoved; ++it)
IEnumerator <DelaunaySegment> cse = copySegment.GetEnumerator();
while (cse.MoveNext() && !triRemoved)
{
DelaunaySegment it = cse.Current;
bool isTriangleIntersected = false;
for (int k = 0; k < 2; k++)
{
int i1 = (k == 0) ? it.i1 : it.i2;
int i2 = i;
for (int l = 0; l < 3; l++)
{
//Early out if 2 points are in fact the same
if (itTri.i[l] == i1 || itTri.i[l] == i2 || itTri.i[(l + 1) % 3] == i1 || itTri.i[(l + 1) % 3] == i2)
{
continue;
}
Segment2D seg2 = new Segment2D(itTri.p(l), itTri.p((l + 1) % 3));
Segment2D seg1 = new Segment2D(pointList[i1], pointList[i2]);
if (seg1.intersects(seg2))
{
isTriangleIntersected = true;
break;
}
}
}
if (isTriangleIntersected)
{
if (!itTri.isDegenerate())
{
//Utils::log("tri inside" + itTri->debugDescription());
for (int m = 0; m < 3; m++)
{
DelaunaySegment d1 = new DelaunaySegment(itTri.i[m], itTri.i[(m + 1) % 3]);
if (segments.find(d1) != segments.end())
{
segments.erase(d1);
}
else if (segments.find(d1.inverse()) != segments.end())
{
segments.erase(d1.inverse());
}
else
{
segments.insert(d1);
}
}
}
//tbuffer.erase(itTri);
need_erase.Clear();
need_erase.Add(itTri);
triRemoved = true;
}
}
}
//do delete
foreach (var v in need_erase)
{
tbuffer.Remove(v);
}
// Find all the non-interior edges
IEnumerator <DelaunaySegment> seg_ie = segments.GetEnumerator();
//for (std::set<DelaunaySegment>::iterator it = segments.begin(); it!=segments.end(); ++it)
while (seg_ie.MoveNext())
{
DelaunaySegment it = seg_ie.Current;
//Triangle dt(&pointList);
Triangle dt = new Triangle(pointList);
dt.setVertices(it.i1, it.i2, i);
dt.makeDirectIfNeeded();
//Utils::log("Add tri " + dt.debugDescription());
tbuffer.push_back(dt);
}
}
// NB : Don't remove super triangle here, because all outer triangles are already removed in the addconstraints method.
// Uncomment that code if delaunay triangulation ever has to be unconstrained...
/*TouchSuperTriangle touchSuperTriangle(maxTriangleIndex, maxTriangleIndex+1,maxTriangleIndex+2);
* tbuffer.remove_if(touchSuperTriangle);
* pointList.pop_back();
* pointList.pop_back();
* pointList.pop_back();*/
}
