mirror of
https://github.com/NGSolve/netgen.git
synced 2024-12-24 21:10:33 +05:00
268 lines
6.8 KiB
C++
268 lines
6.8 KiB
C++
#include <mystdlib.h>
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#include <csg.hpp>
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#include <geometry2d.hpp>
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#include "meshing.hpp"
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namespace netgen
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{
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// static ARRAY<Point<2> > points2;
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// static ARRAY<int> lp1, lp2;
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extern void Optimize2d (Mesh & mesh, MeshingParameters & mp);
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void MeshFromSpline2D (SplineGeometry2d & geometry,
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Mesh *& mesh,
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MeshingParameters & mp)
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{
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PrintMessage (1, "Generate Mesh from spline geometry");
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double h = mp.maxh;
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Box<2> bbox = geometry.GetBoundingBox ();
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if (bbox.Diam() < h)
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{
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h = bbox.Diam();
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mp.maxh = h;
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}
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mesh = new Mesh;
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mesh->SetDimension (2);
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geometry.PartitionBoundary (h, *mesh);
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// marks mesh points for hp-refinement
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for (int i = 0; i < geometry.GetNP(); i++)
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if (geometry.GetPoint(i).hpref)
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{
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double mindist = 1e99;
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PointIndex mpi(0);
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Point<2> gp = geometry.GetPoint(i);
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Point<3> gp3(gp(0), gp(1), 0);
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for (PointIndex pi = PointIndex::BASE;
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pi < mesh->GetNP()+PointIndex::BASE; pi++)
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if (Dist2(gp3, (*mesh)[pi]) < mindist)
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{
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mpi = pi;
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mindist = Dist2(gp3, (*mesh)[pi]);
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}
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(*mesh)[mpi].Singularity(1.);
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}
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int maxdomnr = 0;
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for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
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{
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if ( (*mesh)[si].domin > maxdomnr) maxdomnr = (*mesh)[si].domin;
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if ( (*mesh)[si].domout > maxdomnr) maxdomnr = (*mesh)[si].domout;
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}
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mesh->ClearFaceDescriptors();
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for (int i = 1; i <= maxdomnr; i++)
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mesh->AddFaceDescriptor (FaceDescriptor (i, 0, 0, i));
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// set ARRAY<string*> bcnames...
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// number of bcnames
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int maxsegmentindex = 0;
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for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
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{
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if ( (*mesh)[si].si > maxsegmentindex) maxsegmentindex = (*mesh)[si].si;
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}
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mesh->SetNBCNames(maxsegmentindex);
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for ( int sindex = 0; sindex < maxsegmentindex; sindex++ )
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{
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mesh->SetBCName ( sindex, geometry.GetBCName( sindex+1 ) );
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}
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for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
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{
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(*mesh)[si].SetBCName ( (*mesh).GetBCNamePtr( (*mesh)[si].si-1 ) );
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}
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Point3d pmin(bbox.PMin()(0), bbox.PMin()(1), -bbox.Diam());
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Point3d pmax(bbox.PMax()(0), bbox.PMax()(1), bbox.Diam());
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mesh->SetLocalH (pmin, pmax, mparam.grading);
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mesh->SetGlobalH (h);
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mesh->CalcLocalH();
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int bnp = mesh->GetNP(); // boundary points
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int hquad = mparam.quad;
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for (int domnr = 1; domnr <= maxdomnr; domnr++)
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if (geometry.GetDomainTensorMeshing (domnr))
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{ // tensor product mesh
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ARRAY<PointIndex, PointIndex::BASE> nextpi(bnp);
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ARRAY<int, PointIndex::BASE> si1(bnp), si2(bnp);
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PointIndex firstpi;
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nextpi = -1;
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si1 = -1;
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si2 = -1;
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for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
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{
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int p1 = -1, p2 = -2;
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if ( (*mesh)[si].domin == domnr)
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{ p1 = (*mesh)[si].p1; p2 = (*mesh)[si].p2; }
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if ( (*mesh)[si].domout == domnr)
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{ p1 = (*mesh)[si].p2; p2 = (*mesh)[si].p1; }
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if (p1 == -1) continue;
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nextpi[p1] = p2; // counter-clockwise
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int index = (*mesh)[si].si;
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if (si1[p1] != index && si2[p1] != index)
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{ si2[p1] = si1[p1]; si1[p1] = index; }
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if (si1[p2] != index && si2[p2] != index)
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{ si2[p2] = si1[p2]; si1[p2] = index; }
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}
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PointIndex c1(0), c2, c3, c4; // 4 corner points
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int nex = 1, ney = 1;
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for (PointIndex pi = 1; pi <= si2.Size(); pi++)
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if (si2[pi] != -1)
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{ c1 = pi; break; }
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for (c2 = nextpi[c1]; si2[c2] == -1; c2 = nextpi[c2], nex++);
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for (c3 = nextpi[c2]; si2[c3] == -1; c3 = nextpi[c3], ney++);
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for (c4 = nextpi[c3]; si2[c4] == -1; c4 = nextpi[c4]);
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ARRAY<PointIndex> pts ( (nex+1) * (ney+1) ); // x ... inner loop
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pts = -1;
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for (PointIndex pi = c1, i = 0; pi != c2; pi = nextpi[pi], i++)
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pts[i] = pi;
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for (PointIndex pi = c2, i = 0; pi != c3; pi = nextpi[pi], i++)
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pts[(nex+1)*i+nex] = pi;
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for (PointIndex pi = c3, i = 0; pi != c4; pi = nextpi[pi], i++)
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pts[(nex+1)*(ney+1)-i-1] = pi;
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for (PointIndex pi = c4, i = 0; pi != c1; pi = nextpi[pi], i++)
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pts[(nex+1)*(ney-i)] = pi;
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for (PointIndex pix = nextpi[c1], ix = 0; pix != c2; pix = nextpi[pix], ix++)
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for (PointIndex piy = nextpi[c2], iy = 0; piy != c3; piy = nextpi[piy], iy++)
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{
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Point<3> p = (*mesh)[pix] + ( (*mesh)[piy] - (*mesh)[c2] );
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pts[(nex+1)*(iy+1) + ix+1] = mesh -> AddPoint (p , 1, FIXEDPOINT);
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}
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for (int i = 0; i < ney; i++)
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for (int j = 0; j < nex; j++)
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{
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Element2d el(QUAD);
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el[0] = pts[i*(nex+1)+j];
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el[1] = pts[i*(nex+1)+j+1];
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el[2] = pts[(i+1)*(nex+1)+j+1];
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el[3] = pts[(i+1)*(nex+1)+j];
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el.SetIndex (domnr);
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mesh -> AddSurfaceElement (el);
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}
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}
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for (int domnr = 1; domnr <= maxdomnr; domnr++)
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{
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if (geometry.GetDomainTensorMeshing (domnr)) continue;
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if ( geometry.GetDomainMaxh ( domnr ) > 0 )
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h = geometry.GetDomainMaxh(domnr);
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PrintMessage (3, "Meshing domain ", domnr, " / ", maxdomnr);
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int oldnf = mesh->GetNSE();
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mparam.quad = hquad || geometry.GetDomainQuadMeshing (domnr);
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Meshing2 meshing (Box<3> (pmin, pmax));
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for (PointIndex pi = PointIndex::BASE; pi < bnp+PointIndex::BASE; pi++)
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meshing.AddPoint ( (*mesh)[pi], pi);
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PointGeomInfo gi;
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gi.trignum = 1;
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for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
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{
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if ( (*mesh)[si].domin == domnr)
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meshing.AddBoundaryElement ( (*mesh)[si].p1 + 1 - PointIndex::BASE,
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(*mesh)[si].p2 + 1 - PointIndex::BASE, gi, gi);
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if ( (*mesh)[si].domout == domnr)
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meshing.AddBoundaryElement ( (*mesh)[si].p2 + 1 - PointIndex::BASE,
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(*mesh)[si].p1 + 1 - PointIndex::BASE, gi, gi);
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}
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mparam.checkoverlap = 0;
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meshing.GenerateMesh (*mesh, h, domnr);
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for (SurfaceElementIndex sei = oldnf; sei < mesh->GetNSE(); sei++)
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(*mesh)[sei].SetIndex (domnr);
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// astrid
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char * material;
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geometry.GetMaterial( domnr, material );
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if ( material )
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{
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(*mesh).SetMaterial ( domnr, material );
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}
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}
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mparam.quad = hquad;
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int hsteps = mp.optsteps2d;
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mp.optimize2d = "smcm";
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mp.optsteps2d = hsteps/2;
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Optimize2d (*mesh, mp);
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mp.optimize2d = "Smcm";
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mp.optsteps2d = (hsteps+1)/2;
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Optimize2d (*mesh, mp);
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mp.optsteps2d = hsteps;
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mesh->Compress();
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mesh -> SetNextMajorTimeStamp();
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extern void Render();
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Render();
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}
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}
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