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https://github.com/NGSolve/netgen.git
synced 2024-09-23 02:02:49 +05:00
568 lines
13 KiB
C++
568 lines
13 KiB
C++
/*
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Advancing front class for surfaces
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*/
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#include <mystdlib.h>
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#include "meshing.hpp"
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namespace netgen
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{
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FrontPoint2 :: FrontPoint2 (const Point<3> & ap, PointIndex agi,
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MultiPointGeomInfo * amgi, bool aonsurface)
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{
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p = ap;
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globalindex = agi;
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nlinetopoint = 0;
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frontnr = INT_MAX-10;
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onsurface = aonsurface;
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if (amgi)
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{
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mgi = new MultiPointGeomInfo (*amgi);
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for (int i = 1; i <= mgi->GetNPGI(); i++)
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if (mgi->GetPGI(i).trignum <= 0)
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cout << "WARNING: Add FrontPoint2, illegal geominfo = " << mgi->GetPGI(i).trignum << endl;
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}
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else
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mgi = NULL;
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}
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AdFront2 :: AdFront2 (const Box3d & aboundingbox)
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: boundingbox(aboundingbox),
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linesearchtree(boundingbox.PMin(), boundingbox.PMax()),
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pointsearchtree(boundingbox.PMin(), boundingbox.PMax()),
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cpointsearchtree(boundingbox.PMin(), boundingbox.PMax())
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{
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nfl = 0;
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allflines = 0;
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minval = 0;
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starti = lines.Begin();
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}
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AdFront2 :: ~AdFront2 ()
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{
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delete allflines;
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}
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void AdFront2 :: PrintOpenSegments (ostream & ost) const
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{
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if (nfl > 0)
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{
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ost << nfl << " open front segments left:" << endl;
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for (int i = lines.Begin(); i < lines.End(); i++)
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if (lines[i].Valid())
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ost << i << ": "
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<< GetGlobalIndex (lines[i].L().I1()) << "-"
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<< GetGlobalIndex (lines[i].L().I2()) << endl;
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}
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}
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/*
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void AdFront2 :: GetPoints (NgArray<Point<3> > & apoints) const
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{
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apoints.Append (points);
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// for (int i = 0; i < points.Size(); i++)
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// apoints.Append (points[i].P());
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}
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*/
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int AdFront2 :: AddPoint (const Point<3> & p, PointIndex globind,
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MultiPointGeomInfo * mgi,
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bool pointonsurface)
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{
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// inserts at empty position or resizes array
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int pi;
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if (delpointl.Size() != 0)
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{
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pi = delpointl.Last();
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delpointl.DeleteLast ();
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points[pi] = FrontPoint2 (p, globind, mgi, pointonsurface);
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}
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else
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{
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points.Append (FrontPoint2 (p, globind, mgi, pointonsurface));
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pi = points.Size()-1;
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}
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if (mgi)
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cpointsearchtree.Insert (p, pi);
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if (pointonsurface)
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pointsearchtree.Insert (p, pi);
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return pi;
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}
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int AdFront2 :: AddLine (int pi1, int pi2,
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const PointGeomInfo & gi1, const PointGeomInfo & gi2)
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{
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int minfn;
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int li;
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FrontPoint2 & p1 = points[pi1];
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FrontPoint2 & p2 = points[pi2];
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nfl++;
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p1.AddLine();
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p2.AddLine();
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minfn = min2 (p1.FrontNr(), p2.FrontNr());
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p1.DecFrontNr (minfn+1);
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p2.DecFrontNr (minfn+1);
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if (dellinel.Size() != 0)
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{
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li = dellinel.Last();
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dellinel.DeleteLast ();
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lines[li] = FrontLine (INDEX_2(pi1, pi2));
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}
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else
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{
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lines.Append(FrontLine (INDEX_2(pi1, pi2)));
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li = lines.Size()-1;
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}
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if (!gi1.trignum || !gi2.trignum)
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{
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cout << "WARNING: in AdFront::AddLine, illegal geominfo" << endl;
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}
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lines[li].SetGeomInfo (gi1, gi2);
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Box3d lbox;
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lbox.SetPoint(p1.P());
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lbox.AddPoint(p2.P());
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linesearchtree.Insert (lbox.PMin(), lbox.PMax(), li);
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if (allflines)
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{
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if (allflines->Used (INDEX_2 (GetGlobalIndex (pi1),
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GetGlobalIndex (pi2))))
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{
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cerr << "ERROR Adfront2::AddLine: line exists" << endl;
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(*testout) << "ERROR Adfront2::AddLine: line exists" << endl;
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}
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allflines->Set (INDEX_2 (GetGlobalIndex (pi1),
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GetGlobalIndex (pi2)), 1);
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}
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return li;
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}
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void AdFront2 :: DeleteLine (int li)
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{
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int pi;
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nfl--;
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for (int i = 1; i <= 2; i++)
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{
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pi = lines[li].L().I(i);
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points[pi].RemoveLine();
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if (!points[pi].Valid())
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{
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delpointl.Append (pi);
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if (points[pi].mgi)
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{
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cpointsearchtree.DeleteElement (pi);
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delete points[pi].mgi;
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points[pi].mgi = NULL;
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}
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pointsearchtree.DeleteElement (pi);
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}
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}
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if (allflines)
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{
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allflines->Set (INDEX_2 (GetGlobalIndex (lines[li].L().I1()),
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GetGlobalIndex (lines[li].L().I2())), 2);
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}
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lines[li].Invalidate();
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linesearchtree.DeleteElement (li);
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dellinel.Append (li);
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}
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int AdFront2 :: ExistsLine (int pi1, int pi2)
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{
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if (!allflines)
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return 0;
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if (allflines->Used (INDEX_2(pi1, pi2)))
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return allflines->Get (INDEX_2 (pi1, pi2));
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else
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return 0;
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}
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int AdFront2 :: SelectBaseLine (Point<3> & p1, Point<3> & p2,
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const PointGeomInfo *& geominfo1,
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const PointGeomInfo *& geominfo2,
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int & qualclass)
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{
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int baselineindex = -1;
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for (int i = starti; i < lines.End(); i++)
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{
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if (lines[i].Valid())
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{
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int hi = lines[i].LineClass() +
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points[lines[i].L().I1()].FrontNr() +
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points[lines[i].L().I2()].FrontNr();
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if (hi <= minval)
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{
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minval = hi;
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baselineindex = i;
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break;
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}
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}
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}
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if (baselineindex == -1)
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{
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minval = INT_MAX;
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for (int i = lines.Begin(); i < lines.End(); i++)
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if (lines[i].Valid())
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{
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int hi = lines[i].LineClass() +
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points[lines[i].L().I1()].FrontNr() +
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points[lines[i].L().I2()].FrontNr();
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if (hi < minval)
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{
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minval = hi;
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baselineindex = i;
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}
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}
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}
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starti = baselineindex+1;
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p1 = points[lines[baselineindex].L().I1()].P();
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p2 = points[lines[baselineindex].L().I2()].P();
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geominfo1 = &lines[baselineindex].GetGeomInfo(1);
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geominfo2 = &lines[baselineindex].GetGeomInfo(2);
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qualclass = lines[baselineindex].LineClass();
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return baselineindex;
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}
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int AdFront2 :: GetLocals (int baselineindex,
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NgArray<Point3d> & locpoints,
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NgArray<MultiPointGeomInfo> & pgeominfo,
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NgArray<INDEX_2> & loclines, // local index
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NgArray<INDEX> & pindex,
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NgArray<INDEX> & lindex,
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double xh)
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{
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static int timer = NgProfiler::CreateTimer ("adfront2::GetLocals");
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NgProfiler::RegionTimer reg (timer);
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int pstind;
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Point<3> midp, p0;
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pstind = lines[baselineindex].L().I1();
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p0 = points[pstind].P();
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loclines.Append(lines[baselineindex].L());
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lindex.Append(baselineindex);
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NgArrayMem<int, 1000> nearlines(0);
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NgArrayMem<int, 1000> nearpoints(0);
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// dominating costs !!
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linesearchtree.GetIntersecting (p0 - Vec3d(xh, xh, xh),
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p0 + Vec3d(xh, xh, xh),
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nearlines);
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pointsearchtree.GetIntersecting (p0 - Vec3d(xh, xh, xh),
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p0 + Vec3d(xh, xh, xh),
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nearpoints);
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for (int ii = 0; ii < nearlines.Size(); ii++)
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{
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int i = nearlines[ii];
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if (lines[i].Valid() && i != baselineindex)
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{
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loclines.Append(lines[i].L());
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lindex.Append(i);
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}
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}
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// static NgArray<int> invpindex;
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invpindex.SetSize (points.Size());
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// invpindex = -1;
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for (int i = 0; i < nearpoints.Size(); i++)
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invpindex[nearpoints[i]] = -1;
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for (int i = 0; i < loclines.Size(); i++)
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{
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invpindex[loclines[i].I1()] = 0;
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invpindex[loclines[i].I2()] = 0;
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}
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for (int i = 0; i < loclines.Size(); i++)
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{
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for (int j = 0; j < 2; j++)
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{
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int pi = loclines[i][j];
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if (invpindex[pi] == 0)
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{
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pindex.Append (pi);
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invpindex[pi] = pindex.Size();
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locpoints.Append (points[pi].P());
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loclines[i][j] = locpoints.Size();
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}
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else
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loclines[i][j] = invpindex[pi];
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}
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}
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// double xh2 = xh*xh;
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for (int ii = 0; ii < nearpoints.Size(); ii++)
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{
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int i = nearpoints[ii];
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if (points[i].Valid() &&
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points[i].OnSurface() &&
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// Dist2 (points.Get(i).P(), p0) <= xh2 &&
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invpindex[i] <= 0)
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{
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locpoints.Append (points[i].P());
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invpindex[i] = locpoints.Size();
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pindex.Append(i);
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}
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}
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/*
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double xh2 = xh*xh;
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for (i = 1; i <= points.Size(); i++)
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{
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if (points.Get(i).Valid() &&
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points.Get(i).OnSurface() &&
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Dist2 (points.Get(i).P(), p0) <= xh2 &&
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invpindex.Get(i) <= 0)
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{
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invpindex.Elem(i) =
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locpoints.Append (points.Get(i).P());
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pindex.Append(i);
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}
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}
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*/
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pgeominfo.SetSize (locpoints.Size());
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for (int i = 0; i < pgeominfo.Size(); i++)
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pgeominfo[i].Init();
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for (int i = 0; i < loclines.Size(); i++)
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for (int j = 0; j < 2; j++)
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{
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int lpi = loclines[i][j];
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const PointGeomInfo & gi =
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lines[lindex[i]].GetGeomInfo (j+1);
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pgeominfo.Elem(lpi).AddPointGeomInfo (gi);
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/*
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if (pgeominfo.Elem(lpi).cnt == MULTIPOINTGEOMINFO_MAX)
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break;
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const PointGeomInfo & gi =
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lines.Get(lindex.Get(i)).GetGeomInfo (j);
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PointGeomInfo * pgi = pgeominfo.Elem(lpi).mgi;
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int found = 0;
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for (k = 0; k < pgeominfo.Elem(lpi).cnt; k++)
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if (pgi[k].trignum == gi.trignum)
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found = 1;
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if (!found)
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{
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pgi[pgeominfo.Elem(lpi).cnt] = gi;
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pgeominfo.Elem(lpi).cnt++;
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}
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*/
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}
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for (int i = 0; i < locpoints.Size(); i++)
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{
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int pi = pindex[i];
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if (points[pi].mgi)
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for (int j = 1; j <= points[pi].mgi->GetNPGI(); j++)
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pgeominfo[i].AddPointGeomInfo (points[pi].mgi->GetPGI(j));
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}
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if (loclines.Size() == 1)
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{
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cout << "loclines.Size = 1" << endl;
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(*testout) << "loclines.size = 1" << endl
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<< " h = " << xh << endl
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<< " nearline.size = " << nearlines.Size() << endl
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<< " p0 = " << p0 << endl;
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}
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return lines[baselineindex].LineClass();
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}
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void AdFront2 :: SetStartFront ()
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{
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for (int i = lines.Begin(); i < lines.End(); i++)
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if (lines[i].Valid())
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for (int j = 1; j <= 2; j++)
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points[lines[i].L().I(j)].DecFrontNr(0);
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}
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void AdFront2 :: Print (ostream & ost) const
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{
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ost << points.Size() << " Points: " << endl;
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for (int i = points.Begin(); i < points.End(); i++)
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if (points[i].Valid())
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ost << i << " " << points[i].P() << endl;
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ost << nfl << " Lines: " << endl;
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for (int i = lines.Begin(); i < lines.End(); i++)
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if (lines[i].Valid())
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ost << lines[i].L().I1() << " - " << lines[i].L().I2() << endl;
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ost << flush;
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}
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bool AdFront2 :: Inside (const Point<2> & p) const
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{
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int cnt;
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Vec<2> n;
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Vec<3> v1;
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DenseMatrix a(2), ainv(2);
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Vector b(2), u(2);
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// quasi-random numbers:
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n(0) = 0.123871;
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n(1) = 0.15432;
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cnt = 0;
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for (int i = 0; i < lines.Size(); i++)
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if (lines[i].Valid())
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{
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const Point<3> & p1 = points[lines[i].L().I1()].P();
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const Point<3> & p2 = points[lines[i].L().I2()].P();
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v1 = p2 - p1;
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a(0, 0) = v1(0);
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a(1, 0) = v1(1);
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a(0, 1) = -n(0);
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a(1, 1) = -n(1);
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b(0) = p(0) - p1(0);
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b(1) = p(1) - p1(1);
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CalcInverse (a, ainv);
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ainv.Mult (b, u);
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if (u(0) >= 0 && u(0) <= 1 && u(1) > 0)
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cnt++;
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}
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return ((cnt % 2) != 0);
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}
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bool AdFront2 :: SameSide (const Point<2> & lp1, const Point<2> & lp2,
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const NgArray<int> * testfaces) const
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{
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int cnt = 0;
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if (testfaces)
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{
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for (int ii = 0; ii < testfaces->Size(); ii++)
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if (lines[(*testfaces)[ii]].Valid())
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{
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int i = (*testfaces)[ii];
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const Point<3> & p13d = points[lines[i].L().I1()].P();
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const Point<3> & p23d = points[lines[i].L().I2()].P();
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Point<2> p1(p13d(0), p13d(1));
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Point<2> p2(p23d(0), p23d(1));
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// p1 + alpha v = lp1 + beta vl
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Vec<2> v = p2-p1;
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Vec<2> vl = lp2 - lp1;
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Mat<2,2> mat, inv;
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Vec<2> rhs, sol;
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mat(0,0) = v(0);
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mat(1,0) = v(1);
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mat(0,1) = -vl(0);
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mat(1,1) = -vl(1);
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rhs = lp1-p1;
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if (Det(mat) == 0) continue;
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CalcInverse (mat, inv);
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sol = inv * rhs;
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if ( (sol(0) >= 0) && (sol(0) <= 1) && (sol(1) >= 0) && (sol(1) <= 1))
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{ cnt++; }
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}
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}
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else
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{
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for (int i = 0; i < lines.Size(); i++)
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if (lines[i].Valid())
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{
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const Point<3> & p13d = points[lines[i].L().I1()].P();
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const Point<3> & p23d = points[lines[i].L().I2()].P();
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Point<2> p1(p13d(0), p13d(1));
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Point<2> p2(p23d(0), p23d(1));
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// p1 + alpha v = lp1 + beta vl
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Vec<2> v = p2-p1;
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Vec<2> vl = lp2 - lp1;
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Mat<2,2> mat, inv;
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Vec<2> rhs, sol;
|
|
mat(0,0) = v(0);
|
|
mat(1,0) = v(1);
|
|
mat(0,1) = -vl(0);
|
|
mat(1,1) = -vl(1);
|
|
rhs = lp1-p1;
|
|
|
|
if (Det(mat) == 0) continue;
|
|
CalcInverse (mat, inv);
|
|
sol = inv * rhs;
|
|
if ((sol(0) >= 0) && (sol(0) <= 1) && (sol(1) >= 0) && (sol(1) <= 1))
|
|
{ cnt++; }
|
|
}
|
|
}
|
|
return ((cnt % 2) == 0);
|
|
}
|
|
}
|