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55 lines
1.9 KiB
55 lines
1.9 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) 2015 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_COMPONENTS_H
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#define IGL_COMPONENTS_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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#include <Eigen/Sparse>
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namespace igl
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{
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/// Compute connected components of a graph represented by an adjacency
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/// matrix.
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///
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/// Outputs a component ID per vertex of the graph where connectivity is established by edges.
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///
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/// @param[in] A n by n adjacency matrix
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/// @param[out] C n list of component ids (starting with 0)
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/// @param[out] counts #components list of counts for each component
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///
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template <typename DerivedA, typename DerivedC, typename Derivedcounts>
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IGL_INLINE void vertex_components(
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const Eigen::SparseCompressedBase<DerivedA> & A,
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Eigen::PlainObjectBase<DerivedC> & C,
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Eigen::PlainObjectBase<Derivedcounts> & counts);
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/// \overload
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template <typename DerivedA, typename DerivedC>
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IGL_INLINE void vertex_components(
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const Eigen::SparseCompressedBase<DerivedA> & A,
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Eigen::PlainObjectBase<DerivedC> & C);
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/// Compute the connected components for a mesh given its faces.
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/// Returns a component ID per vertex of the mesh where connectivity is established by edges.
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///
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/// For computing connected components per face see igl::facet_components
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///
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///
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/// @param[in] F n by 3 list of triangle indices
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/// @param[out] C max(F) list of component ids
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template <typename DerivedF, typename DerivedC>
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IGL_INLINE void vertex_components(
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const Eigen::MatrixBase<DerivedF> & F,
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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 "vertex_components.cpp"
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#endif
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#endif
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