54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
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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) 2016 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 "triangulated_grid.h"
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#include "grid.h"
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#include <cassert>
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template <
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typename XType,
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typename YType,
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typename DerivedGV,
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typename DerivedGF>
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IGL_INLINE void igl::triangulated_grid(
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const XType & nx,
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const YType & ny,
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Eigen::PlainObjectBase<DerivedGV> & GV,
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Eigen::PlainObjectBase<DerivedGF> & GF)
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{
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using namespace Eigen;
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Eigen::Matrix<XType,2,1> res(nx,ny);
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igl::grid(res,GV);
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GF.resize((nx-1)*(ny-1)*2,3);
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for(int y = 0;y<ny-1;y++)
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{
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for(int x = 0;x<nx-1;x++)
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{
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// index of southwest corner
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const XType sw = (x +nx*(y+0));
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const XType se = (x+1+nx*(y+0));
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const XType ne = (x+1+nx*(y+1));
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const XType nw = (x +nx*(y+1));
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// Index of first triangle in this square
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const XType gf = 2*(x+(nx-1)*y);
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GF(gf+0,0) = sw;
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GF(gf+0,1) = se;
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GF(gf+0,2) = nw;
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GF(gf+1,0) = se;
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GF(gf+1,1) = ne;
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GF(gf+1,2) = nw;
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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::triangulated_grid<int, int, Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(int const&, int const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&);
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#endif
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