Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / fpl-1.2.0 / FPL2pdequiver.m

diff --git a/octave_packages/fpl-1.2.0/FPL2pdequiver.m b/octave_packages/fpl-1.2.0/FPL2pdequiver.m
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+## Copyright (C) 2004-2008  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} {} FPL2pdequiver (@var{mesh}, @
+## @var{vx}, @var{vy}, [ @var{property}, @var{value} ...])
+## 
+## Plots the 2D vector field @var{vx}, @var{vy} 
+## defined on the triangulation @var{mesh} using opendx.
+##
+## Options (default values):
+## @var{sample_density} (100)
+##
+## @seealso{FPL2pdesurf, FPL2ptcsurf, FPL2ptcquiver}
+## @end deftypefn
+
+function FPL2pdequiver(mesh,vecfieldx,vecfieldy,varargin); 
+  
+  sample_density = "100";
+
+  if( (nargin >= 3) && (rem(nargin,2)==1) )
+    for ii=1:2:length(varargin)
+      [ varargin{ii} " = " varargin{ii+1} ";" ]
+      eval([ varargin{ii} " = """ varargin{ii+1} """;" ]);
+    endfor
+  else  
+    error(["wrong number of parameters " num2str (nargin)])
+  endif
+
+  JX = sum(vecfieldx,1)'/3;
+  JY = sum(vecfieldy,1)'/3;
+
+  dataname = mktemp("/tmp",".dx");
+  scriptname = mktemp("/tmp",".net");
+
+  FPL2dxoutputdata(dataname,mesh.p,mesh.t,[ JX JY],'J',1,2,1);
+
+  showmesh = file_in_path(path,"FPL2pdequiver.net");
+
+  system (["cp " showmesh " " scriptname]);
+  system (["sed -i \'s|__FILE__DX__|" dataname "|g\' " scriptname]);
+  system (["sed -i \'s|__SAMPLE__DENSITY__|" sample_density "|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")
+  endif
+
+  done=false;
+
+  while ~done
+    filename = [direct,"/FPL.",num2str(floor(rand*1e7)),ext];
+    if ~exist(filename,"file")
+      done =true;
+    endif
+  endwhile
+
+endfunction