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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/.
#ifndef IGL_POLYGON_CORNERS_H
#define IGL_POLYGON_CORNERS_H
#include "igl_inline.h"
#include <Eigen/Core>
#include <vector>
namespace igl
{
// Convert a list-of-lists polygon mesh faces representation to list of
// polygon corners and sizes
//
// Inputs:
// P #P list of lists of vertex indices into rows of some matrix V
// Outputs:
// I #I vectorized list of polygon corner indices into rows of some matrix V
// C #P+1 list of cumulative polygon sizes so that C(i+1)-C(i) = size of
// the ith polygon, and so I(C(i)) through I(C(i+1)-1) are the indices of
// the ith polygon
//
template <
typename PType,
typename DerivedI,
typename DerivedC>
IGL_INLINE void polygon_corners(
const std::vector<std::vector<PType> > & P,
Eigen::PlainObjectBase<DerivedI> & I,
Eigen::PlainObjectBase<DerivedC> & C);
// Convert a pure k-gon list of polygon mesh indices to list of polygon corners
// and sizes
//
// Inputs:
// Q #Q by k list of polygon indices (ith row is a k-gon, unless Q(i,j) =
// -1 then it's a j-gon)
template <
typename DerivedQ,
typename DerivedI,
typename DerivedC>
IGL_INLINE void polygon_corners(
const Eigen::MatrixBase<DerivedQ> & Q,
Eigen::PlainObjectBase<DerivedI> & I,
Eigen::PlainObjectBase<DerivedC> & C);
}
#ifndef IGL_STATIC_LIBRARY
# include "polygon_corners.cpp"
#endif
#endif