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netgen/libsrc/geom2d/python_geom2d.cpp

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#ifdef NG_PYTHON
#include <../general/ngpython.hpp>
#include <core/python_ngcore.hpp>
#include "../meshing/python_mesh.hpp"
#include <meshing.hpp>
#include <geometry2d.hpp>
using namespace netgen;
namespace netgen
{
extern std::shared_ptr<NetgenGeometry> ng_geometry;
}
DLL_HEADER void ExportGeom2d(py::module &m)
{
py::class_<SplineSegExt, shared_ptr<SplineSegExt>>
(m, "Spline", "Spline of a SplineGeometry object")
.def_property("leftdom", [] (SplineSegExt& self) { return self.leftdom; },
[](SplineSegExt& self, int dom) { self.leftdom = dom; })
.def_property("rightdom", [] (SplineSegExt& self) { return self.rightdom; },
[](SplineSegExt& self, int dom) { self.rightdom = dom; })
.def_property_readonly("bc", [] (SplineSegExt& self) { return self.bc; })
.def("GetNormal", [](SplineSegExt& self, double t)
{
auto tang = self.GetTangent(t).Normalize();
return Vec<2>(tang[1], -tang[0]);
})
.def("StartPoint", [](SplineSegExt& self) { return Point<2>(self.StartPI()); })
.def("EndPoint", [](SplineSegExt& self) { return Point<2>(self.EndPI()); })
;
py::class_<SplineGeometry2d, NetgenGeometry, shared_ptr<SplineGeometry2d>>
(m, "SplineGeometry",
"a 2d boundary representation geometry model by lines and splines",
py::multiple_inheritance())
.def(py::init<>())
.def(py::init([](const string& filename)
{
auto geo = make_shared<SplineGeometry2d>();
geo->Load(filename.c_str());
ng_geometry = geo;
return geo;
}))
.def(NGSPickle<SplineGeometry2d>())
.def("Load",&SplineGeometry2d::Load)
.def("AppendPoint", FunctionPointer
([](SplineGeometry2d &self, double px, double py, double maxh, double hpref, string name)
{
Point<2> p;
p(0) = px;
p(1) = py;
GeomPoint<2> gp(p);
gp.hmax = maxh;
gp.hpref = hpref;
gp.name = name;
self.geompoints.Append(gp);
return self.geompoints.Size()-1;
}),
py::arg("x"), py::arg("y"), py::arg("maxh") = 1e99, py::arg("hpref")=0, py::arg("name")="")
.def("Append", FunctionPointer([](SplineGeometry2d &self, py::list segment, int leftdomain, int rightdomain,
optional<variant<int, string>> bc, optional<int> copy, double maxh,
double hpref, double hprefleft, double hprefright)
{
auto segtype = py::cast<std::string>(segment[0]);
SplineSegExt * seg;
if (segtype == "line")
{
LineSeg<2> * l = new LineSeg<2>(self.GetPoint(py::cast<int>(segment[1])),
self.GetPoint(py::cast<int>(segment[2])));
seg = new SplineSegExt(*l);
}
else if (segtype == "spline3")
{
SplineSeg3<2> * seg3 = new SplineSeg3<2>(self.GetPoint(py::cast<int>(segment[1])),
self.GetPoint(py::cast<int>(segment[2])),
self.GetPoint(py::cast<int>(segment[3])));
seg = new SplineSegExt(*seg3);
}
else
throw Exception("Appended segment is not a line or a spline3");
seg->leftdom = leftdomain;
seg->rightdom = rightdomain;
seg->hmax = maxh;
seg->hpref_left = max(hpref, hprefleft);
seg->hpref_right = max(hpref,hprefright);
seg->reffak = 1;
seg->copyfrom = -1;
if (copy.has_value())
seg->copyfrom = *copy+1;
if (bc.has_value())
{
if(auto intptr = get_if<int>(&*bc); intptr)
seg->bc = *intptr;
else
{
auto bcname = get_if<string>(&*bc);
seg->bc = self.GetNSplines() + 1;
self.SetBCName(seg->bc, *bcname);
}
}
else
seg->bc = self.GetNSplines()+1;
self.AppendSegment(seg);
return self.GetNSplines()-1;
}), py::arg("point_indices"), py::arg("leftdomain") = 1, py::arg("rightdomain") = py::int_(0),
py::arg("bc")=nullopt, py::arg("copy")=nullopt, py::arg("maxh")=1e99,
py::arg("hpref")=0,py::arg("hprefleft")=0,py::arg("hprefright")=0)
.def("AppendSegment", FunctionPointer([](SplineGeometry2d &self, py::list point_indices, int leftdomain, int rightdomain)
{
int npts = py::len(point_indices);
SplineSegExt * seg;
//int a = py::extract<int>(point_indices[0]);
if (npts == 2)
{
LineSeg<2> * l = new LineSeg<2>(self.GetPoint(py::extract<int>(point_indices[0])()), self.GetPoint(py::extract<int>(point_indices[1])()));
seg = new SplineSegExt(*l);
}
else if (npts == 3)
{
SplineSeg3<2> * seg3 = new SplineSeg3<2>(self.GetPoint(py::extract<int>(point_indices[0])()), self.GetPoint(py::extract<int>(point_indices[1])()), self.GetPoint(py::extract<int>(point_indices[2])()));
seg = new SplineSegExt(*seg3);
}
else
throw Exception("Can only append segments with 2 or 3 points!");
seg->leftdom = leftdomain;
seg->rightdom = rightdomain;
seg->hmax = 1e99;
seg->reffak = 1;
seg->copyfrom = -1;
self.AppendSegment(seg);
}), py::arg("point_indices"), py::arg("leftdomain") = 1, py::arg("rightdomain") = py::int_(0))
.def("AddCurve",
[] (SplineGeometry2d & self, py::object func,
int leftdomain, int rightdomain, py::object bc, double maxh)
{
int n = 1000;
NgArray<Point<2>> points;
for (int i = 0; i <= n; i++)
{
double t = double(i)/n;
py::tuple xy = func(t);
double x = py::cast<double>(xy[0]);
double y = py::cast<double>(xy[1]);
points.Append (Point<2>(x,y));
}
auto spline = new DiscretePointsSeg<2> (points);
SplineSegExt * spex = new SplineSegExt (*spline);
spex -> leftdom = leftdomain;
spex -> rightdom = rightdomain;
spex->hmax = maxh;
spex->reffak = 1;
spex->copyfrom = -1;
if (py::extract<int>(bc).check())
spex->bc = py::extract<int>(bc)();
else if (py::extract<string>(bc).check())
{
string bcname = py::extract<string>(bc)();
spex->bc = self.GetNSplines()+1;
self.SetBCName(spex->bc, bcname);
}
else
spex->bc = self.GetNSplines()+1;
self.AppendSegment (spex);
}, py::arg("func"), py::arg("leftdomain") = 1, py::arg("rightdomain") = py::int_(0),
py::arg("bc")=NGDummyArgument(), py::arg("maxh")=1e99,
"Curve is given as parametrization on the interval [0,1]")
.def("SetMaterial", &SplineGeometry2d::SetMaterial)
.def("SetDomainMaxH", &SplineGeometry2d::SetDomainMaxh)
.def("GetBCName", [](SplineGeometry2d& self, size_t index) { return self.GetBCName(index); })
.def("GetNDomains", [](SplineGeometry2d& self) { return self.GetNDomains(); })
.def("GetNSplines", [](SplineGeometry2d& self) { return self.splines.Size(); })
.def("GetSpline", [](SplineGeometry2d& self, size_t index)
{ return shared_ptr<SplineSegExt>(&self.GetSpline(index), NOOP_Deleter); },
py::return_value_policy::reference_internal)
.def("GetNPoints", [](SplineGeometry2d& self) { return self.GetNP(); })
.def("GetPoint", [](SplineGeometry2d& self, size_t index) { return Point<2>(self.GetPoint(index)); })
.def("PlotData", FunctionPointer([](SplineGeometry2d &self)
{
Box<2> box(self.GetBoundingBox());
double xdist = box.PMax()(0) - box.PMin()(0);
double ydist = box.PMax()(1) - box.PMin()(1);
py::tuple xlim = py::make_tuple(box.PMin()(0) - 0.1*xdist, box.PMax()(0) + 0.1*xdist);
py::tuple ylim = py::make_tuple(box.PMin()(1) - 0.1*ydist, box.PMax()(1) + 0.1*ydist);
py::list xpoints, ypoints;
for (int i = 0; i < self.splines.Size(); i++)
{
py::list xp, yp;
if (self.splines[i]->GetType().compare("line")==0)
{
GeomPoint<2> p1 = self.splines[i]->StartPI();
GeomPoint<2> p2 = self.splines[i]->EndPI();
xp.append(py::cast(p1(0)));
xp.append(py::cast(p2(0)));
yp.append(py::cast(p1(1)));
yp.append(py::cast(p2(1)));
}
else if (self.splines[i]->GetType().compare("spline3")==0)
{
double len = self.splines[i]->Length();
int n = floor(len/(0.05*min(xdist,ydist)));
for (int j = 0; j <= n; j++)
{
GeomPoint<2> point = self.splines[i]->GetPoint(j*1./n);
xp.append(py::cast(point(0)));
yp.append(py::cast(point(1)));
}
}
else
{
cout << "spline is neither line nor spline3" << endl;
}
xpoints.append(xp);
ypoints.append(yp);
}
return py::tuple(py::make_tuple(xlim, ylim, xpoints, ypoints));
}))
.def("_visualizationData", [](SplineGeometry2d &self)
{
Box<2> box(self.GetBoundingBox());
double xdist = box.PMax()(0) - box.PMin()(0);
double ydist = box.PMax()(1) - box.PMin()(1);
py::dict data;
py::dict segment_data;
auto min_val = py::make_tuple(box.PMin()(0), box.PMin()(1),0);
auto max_val = py::make_tuple(box.PMax()(1),box.PMax()(1),0);
py::list vertices;
py::list domains;
py::list segment_points;
py::list segment_normals;
py::list leftdom;
py::list rightdom;
int max_bcnr = 0;
for(int i = 0; i < self.splines.Size(); i++)
{
std::vector<netgen::GeomPoint<2>> lst;
if (self.splines[i]->GetType().compare("line") == 0)
lst = { self.splines[i]->StartPI(), self.splines[i]->EndPI() };
else if(self.splines[i]->GetType().compare("spline3") == 0)
{
double len = self.splines[i]->Length();
int n = floor(len/(0.05*min(xdist,ydist)));
lst.push_back(self.splines[i]->StartPI());
for (int j = 1; j < n; j++){
lst.push_back(self.splines[i]->GetPoint(j*1./n));
lst.push_back(self.splines[i]->GetPoint(j*1./n));
}
lst.push_back(self.splines[i]->EndPI());
}
else
{
throw NgException("Spline is neither line nor spline3");
}
for (auto point : lst)
{
for(auto val : {point(0), point(1), 0.})
vertices.append(val);
int bcnr = self.GetSpline(i).bc;
max_bcnr = max2(max_bcnr, bcnr);
domains.append(bcnr);
domains.append(self.GetSpline(i).leftdom);
domains.append(self.GetSpline(i).rightdom);
}
// segment data
auto pnt = self.splines[i]->GetPoint(0.5);
segment_points.append(py::make_tuple(pnt(0),pnt(1)));
auto normal = self.GetSpline(i).GetTangent(0.5);
std::swap(normal(0),normal(1));
normal(1) *= -1;
normal *= 1./sqrt(normal(0) * normal(0) + normal(1)*normal(1));
segment_normals.append(py::make_tuple(normal(0),normal(1)));
leftdom.append(self.GetSpline(i).leftdom);
rightdom.append(self.GetSpline(i).rightdom);
}
py::list bcnames;
for (int i = 1; i<max_bcnr + 1; i++)
bcnames.append(self.GetBCName(i));
segment_data["midpoints"] = segment_points;
segment_data["normals"] = segment_normals;
segment_data["leftdom"] = leftdom;
segment_data["rightdom"] = rightdom;
data["segment_data"] = segment_data;
data["vertices"] = vertices;
data["domains"] = domains;
data["min"] = min_val;
data["max"] = max_val;
data["bcnames"] = bcnames;
return data;
})
.def("PointData", FunctionPointer([](SplineGeometry2d &self)
{
py::list xpoints, ypoints, pointindex;
for (int i = 0; i < self.geompoints.Size(); i++)
{
pointindex.append(py::cast(i));
xpoints.append(py::cast(self.geompoints[i][0]));
ypoints.append(py::cast(self.geompoints[i][1]));
}
return py::tuple(py::make_tuple(xpoints, ypoints, pointindex));
}))
.def("SegmentData", FunctionPointer([](SplineGeometry2d &self)
{
py::list leftpoints, rightpoints, leftdom, rightdom;
for (int i = 0; i < self.splines.Size(); i++)
{
GeomPoint<2> point = self.splines[i]->GetPoint(0.5);
Vec<2> normal = self.GetSpline(i).GetTangent(0.5);
double temp = normal(0);
normal(0) = normal(1);
normal(1) = -temp;
leftdom.append(py::cast(self.GetSpline(i).leftdom));
rightdom.append(py::cast(self.GetSpline(i).rightdom));
rightpoints.append(py::make_tuple(point(0), point(1), normal(0)<0, normal(1)<0));
leftpoints.append(py::make_tuple(point(0), point(1), normal(0)<0, normal(1)<0));
}
return py::tuple(py::make_tuple(leftpoints, rightpoints, leftdom, rightdom));
}))
.def("Print", FunctionPointer([](SplineGeometry2d &self)
{
for (int i = 0; i < self.geompoints.Size(); i++)
{
cout << i << " : " << self.geompoints[i][0] << " , " << self.geompoints[i][1] << endl;
}
//Box<2> box(self.GetBoundingBox());
//cout << box.PMin() << endl;
//cout << box.PMax() << endl;
cout << self.splines.Size() << endl;
for (int i = 0; i < self.splines.Size(); i++)
{
cout << self.splines[i]->GetType() << endl;
//cout << i << " : " << self.splines[i]->GetPoint(0.1) << " , " << self.splines[i]->GetPoint(0.5) << endl;
}
}))
// If we change to c++17 this can become optional<MeshingParameters>
.def("GenerateMesh", [](shared_ptr<SplineGeometry2d> self,
MeshingParameters* pars, py::kwargs kwargs)
{
MeshingParameters mp;
if(pars) mp = *pars;
{
py::gil_scoped_acquire aq;
CreateMPfromKwargs(mp, kwargs);
}
auto mesh = make_shared<Mesh>();
mesh->SetGeometry(self);
SetGlobalMesh (mesh);
ng_geometry = self;
self->GenerateMesh(mesh, mp);
return mesh;
}, py::arg("mp") = nullptr,
py::call_guard<py::gil_scoped_release>(),
meshingparameter_description.c_str())
;
}
PYBIND11_MODULE(libgeom2d, m) {
ExportGeom2d(m);
}
#endif
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