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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2020 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 "polygon_corners.h"
template <
typename PType,
typename DerivedI,
typename DerivedC>
IGL_INLINE void igl::polygon_corners(
const std::vector<std::vector<PType> > & P,
Eigen::PlainObjectBase<DerivedI> & I,
Eigen::PlainObjectBase<DerivedC> & C)
{
typedef typename DerivedI::Scalar IType;
// JD: Honestly you could do a first loop over P, compute C, and then fill the
// entries of I directly. No need for guesses and push_back(), or the extra
// copy at the end. That would be more efficient.
std::vector<IType> vI;vI.reserve(P.size()*4);
C.resize(P.size()+1);
C(0) = 0;
for(size_t p = 0;p<P.size();p++)
{
C(p+1) = C(p)+P[p].size();
for(size_t c = 0;c<P[p].size();c++)
{
vI.push_back(P[p][c]);
}
}
I = Eigen::Map<DerivedI>(vI.data(),vI.size());
}
template <
typename DerivedQ,
typename DerivedI,
typename DerivedC>
IGL_INLINE void igl::polygon_corners(
const Eigen::MatrixBase<DerivedQ> & Q,
Eigen::PlainObjectBase<DerivedI> & I,
Eigen::PlainObjectBase<DerivedC> & C)
{
I.resize(Q.size());
C.resize(Q.rows()+1);
Eigen::Index c = 0;
C(0) = 0;
for(Eigen::Index p = 0;p<Q.rows();p++)
{
Eigen::Index np = 0;
for(Eigen::Index i = 0;i<Q.cols();i++)
{
if(Q(p,i) == -1){ break;}
I(c++) = Q(p,i);
np++;
}
C(p+1) = C(p)+np;
}
I.conservativeResize(c);
}
#ifdef IGL_STATIC_LIBRARY
// Explicit template instantiation
// generated by autoexplicit.sh
template void igl::polygon_corners<Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, 1, 0, -1, 1>, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&);
// generated by autoexplicit.sh
template void igl::polygon_corners<int, Eigen::Matrix<int, -1, 1, 0, -1, 1>, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&);
#endif