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74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2013 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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#include "adjacency_matrix.h"
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#include "verbose.h"
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#include <vector>
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template <typename DerivedF, typename T>
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IGL_INLINE void igl::adjacency_matrix(
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const Eigen::MatrixBase<DerivedF> & F,
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Eigen::SparseMatrix<T>& A)
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{
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using namespace std;
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using namespace Eigen;
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typedef typename DerivedF::Scalar Index;
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typedef Triplet<T> IJV;
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vector<IJV > ijv;
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ijv.reserve(F.size()*2);
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// Loop over **simplex** (i.e., **not quad**)
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for(int i = 0;i<F.rows();i++)
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{
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// Loop over this **simplex**
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for(int j = 0;j<F.cols();j++)
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for(int k = j+1;k<F.cols();k++)
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{
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// Get indices of edge: s --> d
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Index s = F(i,j);
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Index d = F(i,k);
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ijv.push_back(IJV(s,d,1));
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ijv.push_back(IJV(d,s,1));
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}
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}
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const Index n = F.maxCoeff()+1;
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A.resize(n,n);
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switch(F.cols())
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{
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case 3:
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A.reserve(6*(F.maxCoeff()+1));
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break;
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case 4:
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A.reserve(26*(F.maxCoeff()+1));
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break;
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}
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A.setFromTriplets(ijv.begin(),ijv.end());
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// Force all non-zeros to be one
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// Iterate over outside
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for(int k=0; k<A.outerSize(); ++k)
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{
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// Iterate over inside
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for(typename Eigen::SparseMatrix<T>::InnerIterator it (A,k); it; ++it)
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{
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assert(it.value() != 0);
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A.coeffRef(it.row(),it.col()) = 1;
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}
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}
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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// generated by autoexplicit.sh
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template void igl::adjacency_matrix<Eigen::Matrix<int, -1, -1, 0, -1, -1>, bool>(Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::SparseMatrix<bool, 0, int>&);
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template void igl::adjacency_matrix<Eigen::Matrix<int, -1, -1, 0, -1, -1>, double>(Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::SparseMatrix<double, 0, int>&);
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template void igl::adjacency_matrix<Eigen::Matrix<int, -1, -1, 0, -1, -1>, int>(Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::SparseMatrix<int, 0, int>&);
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#endif
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