35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
|
// This file is part of libigl, a simple c++ geometry processing library.
|
||
|
|
//
|
||
|
|
// Copyright (C) 2015 Alec Jacobson <alecjacobson@gmail.com>
|
||
|
|
//
|
||
|
|
// This Source Code Form is subject to the terms of the Mozilla Public License
|
||
|
|
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
|
||
|
|
// obtain one at http://mozilla.org/MPL/2.0/.
|
||
|
|
#include "directed_edge_parents.h"
|
||
|
|
#include "slice_into.h"
|
||
|
|
#include "slice.h"
|
||
|
|
#include "colon.h"
|
||
|
|
#include "setdiff.h"
|
||
|
|
#include <algorithm>
|
||
|
|
|
||
|
|
template <typename DerivedE, typename DerivedP>
|
||
|
|
IGL_INLINE void igl::directed_edge_parents(
|
||
|
|
const Eigen::PlainObjectBase<DerivedE> & E,
|
||
|
|
Eigen::PlainObjectBase<DerivedP> & P)
|
||
|
|
{
|
||
|
|
using namespace Eigen;
|
||
|
|
using namespace std;
|
||
|
|
VectorXi I = VectorXi::Constant(E.maxCoeff()+1,1,-1);
|
||
|
|
//I(E.col(1)) = 0:E.rows()-1
|
||
|
|
slice_into(colon<int>(0,E.rows()-1),E.col(1).eval(),I);
|
||
|
|
VectorXi roots,_;
|
||
|
|
setdiff(E.col(0).eval(),E.col(1).eval(),roots,_);
|
||
|
|
std::for_each(roots.data(),roots.data()+roots.size(),[&](int r){I(r)=-1;});
|
||
|
|
slice(I,E.col(0).eval(),P);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef IGL_STATIC_LIBRARY
|
||
|
|
// Explicit template instantiation
|
||
|
|
template void igl::directed_edge_parents<Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&);
|
||
|
|
#endif
|