1 ## Copyright (C) 2004-2008 Carlo de Falco, Massimiliano Culpo
3 ## This file is part of
5 ## FPL - Fem PLotting package for octave
7 ## FPL is free software; you can redistribute it and/or modify
8 ## it under the terms of the GNU General Public License as published by
9 ## the Free Software Foundation; either version 2 of the License, or
10 ## (at your option) any later version.
12 ## FPL is distributed in the hope that it will be useful,
13 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 ## GNU General Public License for more details.
17 ## You should have received a copy of the GNU General Public License
18 ## along with FPL; If not, see <http://www.gnu.org/licenses/>.
22 ## Carlo de Falco <cdf _AT_ users.sourceforge.net>
25 ## Bergische Universitaet Wuppertal
26 ## Fachbereich C - Mathematik und Naturwissenschaften
27 ## Arbeitsgruppe fuer Angewandte MathematD-42119 Wuppertal Gaussstr. 20
28 ## D-42119 Wuppertal, Germany
31 ## @deftypefn {Function File} {} FPL2pdequiver (@var{mesh}, @
32 ## @var{vx}, @var{vy}, [ @var{property}, @var{value} ...])
34 ## Plots the 2D vector field @var{vx}, @var{vy}
35 ## defined on the triangulation @var{mesh} using opendx.
37 ## Options (default values):
38 ## @var{sample_density} (100)
40 ## @seealso{FPL2pdesurf, FPL2ptcsurf, FPL2ptcquiver}
43 function FPL2pdequiver(mesh,vecfieldx,vecfieldy,varargin);
45 sample_density = "100";
47 if( (nargin >= 3) && (rem(nargin,2)==1) )
48 for ii=1:2:length(varargin)
49 [ varargin{ii} " = " varargin{ii+1} ";" ]
50 eval([ varargin{ii} " = """ varargin{ii+1} """;" ]);
53 error(["wrong number of parameters " num2str (nargin)])
56 JX = sum(vecfieldx,1)'/3;
57 JY = sum(vecfieldy,1)'/3;
59 dataname = mktemp("/tmp",".dx");
60 scriptname = mktemp("/tmp",".net");
62 FPL2dxoutputdata(dataname,mesh.p,mesh.t,[ JX JY],'J',1,2,1);
64 showmesh = file_in_path(path,"FPL2pdequiver.net");
66 system (["cp " showmesh " " scriptname]);
67 system (["sed -i \'s|__FILE__DX__|" dataname "|g\' " scriptname]);
68 system (["sed -i \'s|__SAMPLE__DENSITY__|" sample_density "|g\' " scriptname]);
70 command = ["dx -noConfirmedQuit -program " scriptname " -execute -image >& /dev/null & "];
77 function filename = mktemp (direct,ext);
79 if (~exist(direct,"dir"))
80 error("trying to save temporary file to non existing directory")
86 filename = [direct,"/FPL.",num2str(floor(rand*1e7)),ext];
87 if ~exist(filename,"file")