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50 lines
1.3 KiB
C++
50 lines
1.3 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 "intersect.h"
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template <class M>
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IGL_INLINE void igl::intersect(const M & A, const M & B, M & C)
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{
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// Stupid O(size(A) * size(B)) to do it
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// Alec: This should be implemented by using unique and sort like `setdiff`
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M dyn_C(A.size() > B.size() ? A.size() : B.size(),1);
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// count of intersects
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int c = 0;
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// Loop over A
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for(int i = 0;i<A.size();i++)
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{
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// Loop over B
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for(int j = 0;j<B.size();j++)
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{
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if(A(i) == B(j))
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{
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dyn_C(c) = A(i);
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c++;
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}
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}
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}
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// resize output
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C.resize(c,1);
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// Loop over intersects
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for(int i = 0;i<c;i++)
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{
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C(i) = dyn_C(i);
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}
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}
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template <class M>
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IGL_INLINE M igl::intersect(const M & A, const M & B)
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{
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M C;
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intersect(A,B,C);
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return C;
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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template Eigen::Matrix<int, -1, 1, 0, -1, 1> igl::intersect<Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::Matrix<int, -1, 1, 0, -1, 1> const&, Eigen::Matrix<int, -1, 1, 0, -1, 1> const&);
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#endif
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