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% Copyright (C) 2005-2016 Julien Pommier.
%
% This file is a part of GetFEM++
%
% GetFEM++ is free software; you can redistribute it and/or modify it
% under the terms of the GNU Lesser General Public License as published
% by the Free Software Foundation; either version 3 of the License, or
% (at your option) any later version along with the GCC Runtime Library
% Exception either version 3.1 or (at your option) any later version.
% This program is distributed in the hope that it will be useful, but
% WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
% or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
% License and GCC Runtime Library Exception for more details.
% You should have received a copy of the GNU Lesser General Public License
% along with this program; if not, write to the Free Software Foundation,
% Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
function check_slices(iverbose,idebug)
global gverbose;
global gdebug;
if (nargin >= 1),
gverbose = iverbose;
if (nargin == 2),
gdebug = idebug;
else
gdebug = 0; end;
else
gverbose = 0;
end;
gf_workspace('clear all');
m=gf_mesh('triangles grid',[-5:1:5],[-4:.8:4]);
% m=gf_mesh('triangles grid',[-1 1],[-1 1]);
gf_mesh_get(m,'cvid');
gf_mesh_set(m,'del convex',[1]);
mf=gf_mesh_fem(m,1);
gf_mesh_fem_set(mf,'fem',gf_fem('FEM_PK(2,2)'))
U=gf_mesh_fem_get(mf,'eval', {'x.*x + y.*y'});
sl=gf_slice({'planar',0,[.5;0],[1;0]},m,3);
pp=gf_slice_get(sl,'pts');
gfassert('abs(pp(1,:)-.5)<1e-15');
sl2=gf_slice('points',m,pp(:,1:3));
pp2=gf_slice_get(sl2,'pts');
gfassert('abs(pp2(1,:)-.5)<1e-15');
% n=8;sl=gf_slice(m,{'isovalues',-1,mf,U,0.25},n);
sl=gf_slice({'isovalues',-1,mf,U,16.0},m,4);
% gf_plot_slice(sl,'mesh','on','data',gf_compute(mf,U,'interpolate on',sl)); colorbar;
pp=gf_slice_get(sl,'pts');
gfassert('max(sqrt(sum(pp.^2,1)))<4.0000001');
sl=gf_slice({'isovalues',0,mf,U,9.0},m,7);
pp=gf_slice_get(sl,'pts');
gfassert('max(abs(3-sqrt(sum(pp.^2,1))))<0.0015');
N=1;m=gf_mesh('triangles grid',[-N:(2*N/3):N],[-N:(N/5):N]);
m2=gf_mesh('cartesian',[-N:(N/5):N]+.1,[-N:(N/7):N]+.1);
sl=gf_slice({'mesh',m2},m,3);%gf_plot_slice(sl,'mesh_faces','on');
a=gf_slice_get(sl,'area') - 1.9*1.9;
gfassert('a < 1e-10');
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