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54 lines
1.8 KiB
54 lines
1.8 KiB
1 year ago
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// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2020 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef IGL_POLYGON_CORNERS_H
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#define IGL_POLYGON_CORNERS_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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#include <vector>
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namespace igl
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{
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/// Convert a list-of-lists polygon mesh faces representation to list of
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/// polygon corners and sizes
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///
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/// @param[in] P #P list of lists of vertex indices into rows of some matrix V
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/// @param[out] I #I vectorized list of polygon corner indices into rows of some matrix V
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/// @param[out] C #P+1 list of cumulative polygon sizes so that C(i+1)-C(i) = size of
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/// the ith polygon, and so I(C(i)) through I(C(i+1)-1) are the indices of
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/// the ith polygon
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///
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template <
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typename PType,
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typename DerivedI,
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typename DerivedC>
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IGL_INLINE void polygon_corners(
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const std::vector<std::vector<PType> > & P,
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Eigen::PlainObjectBase<DerivedI> & I,
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Eigen::PlainObjectBase<DerivedC> & C);
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/// \overload
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/// \brief Convert a pure k-gon list of polygon mesh indices to list of
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/// polygon corners and sizes
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///
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/// @param[in] Q #Q by k list of polygon indices (ith row is a k-gon, unless Q(i,j) =
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/// -1 then it's a j-gon)
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template <
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typename DerivedQ,
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typename DerivedI,
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typename DerivedC>
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IGL_INLINE void polygon_corners(
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const Eigen::MatrixBase<DerivedQ> & Q,
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Eigen::PlainObjectBase<DerivedI> & I,
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Eigen::PlainObjectBase<DerivedC> & C);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "polygon_corners.cpp"
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#endif
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#endif
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