Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / fpl-1.2.0 / FPL2pdeshowmesh.m

diff --git a/octave_packages/fpl-1.2.0/FPL2pdeshowmesh.m b/octave_packages/fpl-1.2.0/FPL2pdeshowmesh.m
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+## Copyright (C) 2004-2008,2009  Carlo de Falco, Massimiliano Culpo
+##
+##  This file is part of 
+##
+##                   FPL - Fem PLotting package for octave
+## 
+##  FPL 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.
+## 
+##  FPL 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 FPL; If not, see <http://www.gnu.org/licenses/>.
+##
+##
+##  AUTHORS:
+##  Carlo de Falco <cdf _AT_ users.sourceforge.net>
+##
+##  Culpo Massimiliano
+##  Bergische Universitaet Wuppertal
+##  Fachbereich C - Mathematik und Naturwissenschaften
+##  Arbeitsgruppe fuer Angewandte MathematD-42119 Wuppertal  Gaussstr. 20 
+##  D-42119 Wuppertal, Germany
+
+## -*- texinfo -*-
+##
+## @deftypefn {Function File} {} FPL2pdeshowmesh (@var{mesh},@var{color})
+## 
+## Displays one 2-D triangulations using opendx
+##
+## Examples:
+## @example
+##
+## FPL2pdeshowmesh(mesh)
+## FPL2pdeshowmesh(mesh,"blue")
+##
+## @end example
+##
+## @seealso{FPL2ptcshowmesh}
+## @end deftypefn
+
+function FPL2pdeshowmesh (varargin)
+
+  if nargin == 1
+    colorname = "red";
+  else
+    colorname = varargin{2};
+  endif
+
+  dataname = mktemp("/tmp",".dx");
+  FPL2dxoutputdata(dataname,varargin{1}.p,varargin{1}.t,varargin{1}.p(1,:)','x',0,1,1);
+  
+  scriptname = mktemp("/tmp",".net");
+  
+  showmesh = file_in_path(path,"FPL2pdeshowmesh.net");
+  
+  system (["cp " showmesh " " scriptname]);
+  system (["sed -i \'s|FILENAME|" dataname "|g\' " scriptname]);
+  system (["sed -i \'s|COLORNAME|" colorname "|g\' " scriptname]);
+
+  command = ["dx  -noConfirmedQuit -program " scriptname " -execute -image  >& /dev/null & "];  
+  system(command);
+  
+endfunction
+  
+function filename = mktemp (direct,ext);
+
+  if (~exist(direct,"dir"))
+    error("trying to save temporary file to non existing directory")
+  end
+
+  done=false;
+
+  while ~done
+    filename = [direct,"/FPL.",num2str(floor(rand*1e7)),ext];
+    if ~exist(filename,"file")
+      done =true;
+    endif
+  endwhile
+
+endfunction
+
+%!demo
+%! msh.p = [0 0; 1 0; 1 1; 0 1].';
+%! msh.t = [1 2 3 1; 1 3 4 1].';
+%! msh.e = [1 2 0 0 1 0 1; 2 3 0 0 2 0 1; 3 4 0 0 3 0 1; 4 1 0 0 4 0 1].';
+%! FPL2pdeshowmesh (msh, "red");
+%! s = input ("do you see a red outlined square divided in two triangles (if you see an empty plot try ctrl-F)? (y/n): " ,"s");
+%! assert(s, "y")
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