1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
## Copyright (C) 2016 - Juan Pablo Carbajal
##
## This program 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 3 of the License, 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 General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/>.
## Author: Juan Pablo Carbajal <ajuanpi+dev@gmail.com>
## -*- texinfo -*-
## @deftypefn {Function File} {@var{fileStr} =} data2geo (@var{data}, @var{lc})
## @deftypefnx {Function File} {@var{fileStr} =} data2geo (@dots{}, @var{param}, @var{value})
## Uses data to build a file compatible with Gmsh.
##
## @var{data} is assumed to describe a polygon in @code{polygon2d} format.
## The argument @var{lc} specifies the edge size.
##
## The optional parameters can be 'output' followed with a string specifying a file
## to write, and 'spherical' followed by a real number @var{r} indicating that the
## polygon describes a spherical surface of radious @var{r}.
##
## @seealso{polygon2d, @@svg/path2polygon}
## @end deftypefn
function strFile = data2geo(data,lc,varargin)
nl = @()sprintf('\n');
## Parse options
filegiven = [];
spherical = [];
if nargin > 2
filegiven = find(cellfun(@(x)strcmpi(x,'output'),varargin));
spherical = find(cellfun(@(x)strcmpi(x,'spherical'),varargin));
end
[n dim] = size(data);
if dim == 2
data(:,3) = zeros(n,1);
end
header = ' // File created with Octave';
strFile = [header nl()];
# Points
strFile = [strFile '// Points' nl()];
for i=1:n
strFile = [strFile pointGeo(i,data(i,:),lc)];
end
# Lines
strFile = [strFile '// Lines' nl()];
for i=1:n-1
strFile = [strFile lineGeo(i,i,i+1)];
end
strFile = [strFile lineGeo(n,n,1)];
# Loop
strFile = [strFile lineLoopGeo(n+1,n,1:n)];
# Surface
if spherical
sphr = varargin{spherical+1};
if dim ==2
sphr(1,3) = 0;
end
strFile = [strFile pointGeo(n+1,sphr,lc)];
strFile = [strFile ruledSurfGeo(n+3,1,n+1,n+1)];
else
strFile = [strFile planeSurfGeo(n+2,1,n+1)];
end
if filegiven
outfile = varargin{filegiven+1};
fid = fopen(outfile,'w');
fprintf(fid,'%s',strFile);
fclose(fid);
disp(['DATA2GEO: Geometry file saved to ' outfile])
end
endfunction
%!demo
%! points = [0 0 0; 0.1 0 0; 0.1 .3 0; 0 0.3 0];
%! strFile = data2geo(points,0.009);
%! disp(strFile)
%!demo
%! dc = svg('drawing6.svg');
%! ids = dc.pathid();
%! P = dc.path2polygon(ids{1},12)(1:end-1,:);
%! P = bsxfun(@minus, P, centroid(P));
%! P = simplifyPolygon(P,'tol',5e-1);
%! filename = tmpnam ();
%! meshsize = sqrt(mean(sumsq(diff(P,1,1),2)))/2;
%! data2geo (P, meshsize, 'output', [filename '.geo']);
%!
%! pkg load msh fpl
%! T = msh2m_gmsh(filename);
%! pdemesh(T.p,T.e,T.t)
%! view(2)
%! axis tight
%! # --------------------------------------------------------------------------
%! # We load the drawing6.svg file into Octave and transform it into a polygon.
%! # Then we create a temporary file where the .geo mesh will be written.
%! # If the packages msh and fpl are available, a mesh is created from the .geo
%! # file.
|
