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98 lines
2.6 KiB
98 lines
2.6 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) 2019 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 "quad_grid.h"
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#include "grid.h"
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template<
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typename DerivedV,
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typename DerivedQ,
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typename DerivedE>
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IGL_INLINE void igl::quad_grid(
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const int nx,
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const int ny,
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Eigen::PlainObjectBase<DerivedV> & V,
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Eigen::PlainObjectBase<DerivedQ> & Q,
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Eigen::PlainObjectBase<DerivedE> & E)
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{
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grid(Eigen::Vector2i(nx,ny),V);
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return igl::quad_grid(nx,ny,Q,E);
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}
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template<
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typename DerivedQ,
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typename DerivedE>
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IGL_INLINE void igl::quad_grid(
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const int nx,
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const int ny,
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Eigen::PlainObjectBase<DerivedQ> & Q,
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Eigen::PlainObjectBase<DerivedE> & E)
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{
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Eigen::MatrixXi I(nx,ny);
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Q.resize( (nx-1)*(ny-1),4);
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E.resize((nx-1)*ny + (ny-1)*nx,2);
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{
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int v = 0;
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int q = 0;
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int e = 0;
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// Ordered to match igl::grid
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for(int y = 0;y<ny;y++)
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{
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for(int x = 0;x<nx;x++)
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{
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//// Add a vertex
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//V(v,0) = (-1.0) + double(x)/double(nx-1) * (1.0 - (-1.0));
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//V(v,2) = (-1.0) + double(y)/double(ny-1) * (1.0 - (-1.0));
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I(x,y) = v;
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v++;
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// Add a verical edge
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if(y>0)
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{
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E(e,0) = I(x,y);
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E(e,1) = I(x,y-1);
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e++;
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}
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// Add a horizontal edge
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if(x>0)
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{
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E(e,0) = I(x,y);
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E(e,1) = I(x-1,y);
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e++;
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}
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// Add two triangles
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if(x>0 && y>0)
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{
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// -1,0----0,0
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// | / |
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// | / |
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// | / |
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// | / |
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// -1,-1---0,-1
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Q(q,0) = I(x-0,y-0);
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Q(q,1) = I(x-1,y-0);
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Q(q,2) = I(x-1,y-1);
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Q(q,3) = I(x-0,y-1);
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q++;
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//F(f,2) = I(x-0,y-0);
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//F(f,1) = I(x-1,y-0);
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//F(f,0) = I(x-1,y-1);
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//f++;
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//F(f,2) = I(x-0,y-0);
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//F(f,1) = I(x-1,y-1);
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//F(f,0) = I(x-0,y-1);
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//f++;
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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::quad_grid<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(int, int, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&);
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#endif
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