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63 lines
2.3 KiB
C++
63 lines
2.3 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 "columnize.h"
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#include <cassert>
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template <typename DerivedA, typename DerivedB>
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IGL_INLINE void igl::columnize(
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const Eigen::PlainObjectBase<DerivedA> & A,
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const int k,
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const int dim,
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Eigen::PlainObjectBase<DerivedB> & B)
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{
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// Eigen matrices must be 2d so dim must be only 1 or 2
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assert(dim == 1 || dim == 2);
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// block height, width, and number of blocks
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int m,n;
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if(dim == 1)
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{
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m = A.rows()/k;
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assert(m*(int)k == (int)A.rows());
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n = A.cols();
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}else// dim == 2
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{
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m = A.rows();
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n = A.cols()/k;
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assert(n*(int)k == (int)A.cols());
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}
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// resize output
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B.resize(A.rows()*A.cols(),1);
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for(int b = 0;b<(int)k;b++)
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{
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for(int i = 0;i<m;i++)
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{
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for(int j = 0;j<n;j++)
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{
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if(dim == 1)
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{
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B(j*m*k+i*k+b) = A(i+b*m,j);
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}else
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{
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B(j*m*k+i*k+b) = A(i,b*n+j);
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}
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}
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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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template void igl::columnize<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, 1, 0, -1, 1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, int, int, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 1, 0, -1, 1> >&);
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template void igl::columnize<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, int, int, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&);
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template void igl::columnize<Eigen::Matrix<float, -1, -1, 0, -1, -1>, Eigen::Matrix<float, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<float, -1, -1, 0, -1, -1> > const&, int, int, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, -1, 0, -1, -1> >&);
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template void igl::columnize<Eigen::Matrix<float, -1, -1, 0, -1, -1>, Eigen::Matrix<float, -1, 1, 0, -1, 1> >(Eigen::PlainObjectBase<Eigen::Matrix<float, -1, -1, 0, -1, -1> > const&, int, int, Eigen::PlainObjectBase<Eigen::Matrix<float, -1, 1, 0, -1, 1> >&);
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#endif
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