/usr/share/octave/packages/msh-1.0.10/msh2m_gmsh.m is in octave-msh 1.0.10-1.
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##
## This file is part of:
## MSH - Meshing Software Package for Octave
##
## MSH is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## MSH 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 General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with MSH; If not, see <http://www.gnu.org/licenses/>.
##
## author: Carlo de Falco <cdf _AT_ users.sourceforge.net>
## author: Massimiliano Culpo <culpo _AT_ users.sourceforge.net>
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{mesh}]} = @
## msh2m_gmsh(@var{geometry},@var{option},@var{value},...)
## @deftypefnx {Function File}{[@var{mesh}, @var{gmsh_out}]} = msh2m_gmsh(...)
##
## Construct an unstructured triangular 2D mesh making use of the free
## software gmsh.
##
## The compulsory argument @var{geometry} is the basename of the
## @code{*.geo} file to be meshed.
##
## The optional arguments @var{option} and @var{value} identify
## respectively a gmsh option and its value. For more information
## regarding the possible option to pass, refer to gmsh manual or gmsh
## site @url{http://www.geuz.org/gmsh/}.
##
## The returned value @var{mesh} is a PDE-tool like mesh structure.
## If the function is called with two outputs @var{gmsh_out} is the verbose output
## of the gmsh subprocess.
##
## @seealso{msh2m_structured_mesh, msh3m_gmsh, msh2m_mesh_along_spline}
## @end deftypefn
function [mesh, gmsh_output] = msh2m_gmsh (geometry, varargin)
## Check input
if !mod(nargin,2) # Number of input parameters
error("msh2m_gmsh: wrong number of input parameters.");
endif
## FIXME: add input type check?
## Build mesh
noptions = (nargin - 1) / 2; # Number of passed options
## Construct system command string
verbose = 1;
optstring = "";
for ii = 1:noptions
option = varargin{2*(ii)-1};
value = varargin{2*ii};
## Check for verbose option
if strcmp(option,"v")
verbose = value;
endif
if !ischar(value)
value = num2str(value);
endif
optstring = [optstring," -",option," ",value];
endfor
## Invoke gmsh
if (verbose)
printf("\n");
printf("Generating mesh...\n");
endif
msh_name = strcat (tmpnam (), ".msh");
fclose (fopen (msh_name, "w"));
[status, gmsh_output] = system (["gmsh -format msh -2 -o " msh_name optstring " " geometry ".geo 2>&1 "]);
if (status)
error ("msh2m_gmsh: the gmesh subprocess exited abnormally");
endif
fname = tmpnam ();
fclose (fopen (strcat (fname, "_e.txt"), "w"));
e_filename = canonicalize_file_name (strcat (fname, "_e.txt"));
fclose (fopen (strcat (fname, "_p.txt"), "w"));
p_filename = canonicalize_file_name (strcat (fname, "_p.txt"));
fclose (fopen (strcat (fname, "_t.txt"), "w"));
t_filename = canonicalize_file_name (strcat (fname, "_t.txt"));
## Build structure fields
if (verbose)
printf("Processing gmsh data...\n");
endif
## Points
com_p = sprintf ("awk '/\\$Nodes/,/\\$EndNodes/ {print $2, $3 > ""%s""}' ", p_filename);
## Side edges
com_e = sprintf ("awk '/\\$Elements/,/\\$EndElements/ {n=3+$3; if ($2 == ""1"") print $(n+1), $(n+2), $5 > ""%s""}' ", e_filename);
## Triangles
com_t = sprintf ("awk '/\\$Elements/,/\\$EndElements/ {n=3+$3; if ($2 == ""2"") print $(n+1), $(n+2), $(n+3), $5 > ""%s""}' ", t_filename);
command = [com_p, msh_name, ";"];
command = [command, com_e, msh_name, ";"];
command = [command, com_t, msh_name];
system (command);
## Create PDE-tool like structure
if (verbose)
printf("Creating PDE-tool like mesh...\n");
endif
p = load(p_filename)'; # Mesh-points
tmp = load(e_filename)'; # Mesh surface-edges
be = zeros(7,columns(tmp));
be([1,2,5],:) = tmp;
t = load(t_filename)'; # Mesh tetrahedra
## Remove hanging nodes
if (verbose)
printf("Check for hanging nodes...\n");
endif
nnodes = columns(p);
in_msh = intersect( 1:nnodes , t(1:3,:) );
if length(in_msh) != nnodes
new_num(in_msh) = [1:length(in_msh)];
t(1:3,:) = new_num(t(1:3,:));
be(1:2,:) = new_num(be(1:2,:));
p = p(:,in_msh);
endif
## Set region numbers in edge structure
if (verbose)
printf("Setting region number in edge structure...\n");
endif
mesh = struct("p",p,"t",t,"e",be);
tmp = msh2m_topological_properties (mesh, "boundary");
mesh.e(6,:) = t(4,tmp(1,:));
jj = find (sum(tmp>0)==4);
mesh.e(7,jj) = t(4,tmp(3,jj));
## Delete temporary files
if (verbose)
printf("Deleting temporary files...\n");
endif
unlink (p_filename);
unlink (e_filename);
unlink (t_filename);
unlink (msh_name);
endfunction
%!test
%! fid = fopen("circle.geo","w");
%! fprintf(fid,"Point(1) = {0, 0, 0, 1};\n");
%! fprintf(fid,"Point(2) = {1, 0, 0, 1};\n");
%! fprintf(fid,"Point(3) = {-1, 0, 0, 1};\n");
%! fprintf(fid,"Circle(1) = {3, 1, 2};\n");
%! fprintf(fid,"Circle(2) = {2, 1, 3};\n");
%! fprintf(fid,"Line Loop(4) = {2, 1};\n");
%! fprintf(fid,"Plane Surface(4) = {4};");
%! fclose(fid);
%! mesh = msh2m_gmsh("circle","v",0);
%! system("rm circle.geo");
%! nnodest = length(unique(mesh.t));
%! nnodesp = columns(mesh.p);
%! assert(nnodest,nnodesp);
%!demo
%! name = [tmpnam ".geo"];
%! fid = fopen (name, "w");
%! fputs (fid, "Point(1) = {0, 0, 0, .1};\n");
%! fputs (fid, "Point(2) = {1, 0, 0, .1};\n");
%! fputs (fid, "Point(3) = {1, 0.5, 0, .1};\n");
%! fputs (fid, "Point(4) = {1, 1, 0, .1};\n");
%! fputs (fid, "Point(5) = {0, 1, 0, .1};\n");
%! fputs (fid, "Point(6) = {0, 0.5, 0, .1};\n");
%! fputs (fid, "Line(1) = {1, 2};\n");
%! fputs (fid, "Line(2) = {2, 3};\n");
%! fputs (fid, "Line(3) = {3, 4};\n");
%! fputs (fid, "Line(4) = {4, 5};\n");
%! fputs (fid, "Line(5) = {5, 6};\n");
%! fputs (fid, "Line(6) = {6, 1};\n");
%! fputs (fid, "Point(7) = {0.2, 0.6, 0};\n");
%! fputs (fid, "Point(8) = {0.5, 0.4, 0};\n");
%! fputs (fid, "Point(9) = {0.7, 0.6, 0};\n");
%! fputs (fid, "BSpline(7) = {6, 7, 8, 9, 3};\n");
%! fputs (fid, "Line Loop(8) = {6, 1, 2, -7};\n");
%! fputs (fid, "Plane Surface(9) = {8};\n");
%! fputs (fid, "Line Loop(10) = {7, 3, 4, 5};\n");
%! fputs (fid, "Plane Surface(11) = {10};\n");
%! fclose (fid);
%! mesh = msh2m_gmsh (canonicalize_file_name (name)(1:end-4), "clscale", ".5");
%! trimesh (mesh.t(1:3,:)', mesh.p(1,:)', mesh.p(2,:)');
%! unlink (canonicalize_file_name (name));
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