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Implemented FindElementOfPoint for 2d mesh

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This commit is contained in:
Michael Neunteufel 2019-02-13 15:36:17 +01:00
parent c22c19c6df
commit f81ca7d921
1 changed files with 51 additions and 14 deletions
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65
libsrc/interface/nginterface_v2.cpp
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@ -1007,22 +1007,59 @@ namespace netgen
int * const indices, int numind) const
{
if (mesh->GetDimension() != 1)
throw NgException("FindElementOfPoint<1> called for multidim mesh");
Point<3> p(hp[0], 0,0);
for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
switch (mesh->GetDimension())
{
auto & seg = (*mesh)[si];
Point<3> p1 = (*mesh)[seg[0]];
Point<3> p2 = (*mesh)[seg[1]];
double lam = (p(0)-p1(0)) / (p2(0)-p1(0));
if (lam >= -1e-10 && lam <= 1+1e-10)
{
lami[0] = 1-lam;
return si;
}
case 1:
{
Point<3> p(hp[0], 0,0);
for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
{
auto & seg = (*mesh)[si];
Point<3> p1 = (*mesh)[seg[0]];
Point<3> p2 = (*mesh)[seg[1]];
double lam = (p(0)-p1(0)) / (p2(0)-p1(0));
if (lam >= -1e-10 && lam <= 1+1e-10)
{
lami[0] = 1-lam;
return si;
}
}
}
break;
case 2:
{
Point<3> p(hp[0], hp[1],0);
for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
{
auto & seg = (*mesh)[si];
Point<3> p1 = (*mesh)[seg[0]];
Point<3> p2 = (*mesh)[seg[1]];
double lam;
double r;
if (fabs(p2[0]-p1[0]) >= fabs(p2[1]-p1[1]))
{
lam = (p[0]-p1[0])/(p2[0]-p1[0]);
r = p[1] - p1[1] - lam*(p2[1]-p1[1]);
}
else
{
lam = (p[1]-p1[1])/(p2[1]-p1[1]);
r = p[0] - p1[0] - lam*(p2[0]-p1[0]);
}
if ( lam >= -1e-10 && lam <= 1+1e-10 && fabs(r) <= 1e-10 )
{
lami[0] = 1-lam;
return si;
}
}
}
break;
case 3:
default:
throw Exception("FindElementOfPoint<1> only implemented for mesh-dimension 1 and 2!");
break;
}
return -1;
}