/usr/share/octave/packages/fpl-1.3.4/fpl_vtk_write_field.m is in octave-fpl 1.3.4-2.
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##
## 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 3 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/>.
##
## author: Carlo de Falco <cdf _AT_ users.sourceforge.net>
## author: Massimiliano Culpo <culpo _AT_ users.sourceforge.net>
## -*- texinfo -*-
## @deftypefn {Function File} {} fpl_vtk_write_field (@var{basename}, @
## @var{mesh}, @var{nodedata}, @var{celldata}, @var{endfile})
##
## Output data field in serial XML-VTK UnstructuredGrid format.
##
## @var{basename} is a string containing the base-name of the (vtu) file
## where the data will be saved.
##
## @var{mesh} is a PDE-tool like mesh, like the ones generated by the
## "msh" package.
##
## @var{nodedata} and @var{celldata} are (Ndata x 2) cell arrays containing
## respectively <PointData> and <CellData> representing scalars or
## vectors:
## @itemize @minus
## @item @var{*data}@{:,1@} = variable data;
## @item @var{*data}@{:,2@} = variable names;
## @end itemize
##
## @var{endfile} should be 0 if you want to add other variables to the
## same file, 1 otherwise.
##
## Example:
## @example
## <generate msh1, node centered field nc1, cell centered field cc1>
## fpl_vtk_write_field ("example", msh1, @{nc1, "temperature"@}, @{cc1, "density"@}, 0);
## <generate msh2, node centered field nc2>
## fpl_vtk_write_field ("example", msh2, @{nc2, "temperature"@}, @{@}, 1);
## @end example
## will generate a valid XML-VTK UnstructuredGrid file.
##
## @seealso{fpl_dx_write_field, fpl_dx_write_series, fpl_vtk_assemble_series}
##
## @end deftypefn
function fpl_vtk_write_field (basename, mesh, nodedata, celldata, endfile)
## Check input
if nargin!=5
error ("fpl_vtk_write_field: wrong number of input parameters");
endif
if (! ischar (basename))
error ("fpl_vtk_write_field: basename should be a string");
elseif (! isstruct (mesh))
error ("fpl_vtk_write_field: mesh should be a struct");
elseif (! (iscell (nodedata) && iscell (celldata)))
error ("fpl_vtk_write_field: nodedata and celldata should be cell arrays");
endif
filename = [basename ".vtu"];
if (! exist (filename, "file"))
fid = fopen (filename, "w");
## Header
fprintf (fid, "<?xml version=""1.0""?>\n");
fprintf (fid, "<VTKFile type=""UnstructuredGrid"" version=""0.1"" byte_order=""LittleEndian"">\n");
fprintf (fid, "<UnstructuredGrid>\n");
else
## FIXME: the following should be performed in a cleaner way! Does a
## backward fgetl function exist?
## If file exist, check if it was already closed
fid = fopen (filename, "r");
fseek (fid, -10, SEEK_END);
tst = fgetl (fid);
if (strcmp (tst, "</VTKFile>"))
error ("fpl_vtk_write_field: file %s exist and was already closed", filename);
endif
fclose (fid);
fid = fopen (filename, "a");
endif
p = mesh.p;
dim = rows (p); # 2D or 3D
if dim == 2
t = mesh.t (1:3,:);
elseif dim == 3
t = mesh.t (1:4,:);
else
error ("fpl_vtk_write_field: neither 2D triangle nor 3D tetrahedral mesh");
endif
t -= 1;
nnodes = columns (p);
nelems = columns (t);
## Header for <Piece>
fprintf (fid, "<Piece NumberOfPoints=""%d"" NumberOfCells=""%d"">\n", nnodes, nelems);
## Print grid
print_grid (fid, dim, p, nnodes, t, nelems);
## Print Data
print_data_points (fid, nodedata, nnodes)
print_cell_data (fid, celldata, nelems)
## Footer for <Piece>
fprintf (fid, "</Piece>\n");
if (endfile)
## Footer
fprintf (fid, "</UnstructuredGrid>\n");
fprintf (fid, "</VTKFile>");
endif
fclose (fid);
endfunction
## Print Points and Cells Data
function print_grid (fid, dim, p, nnodes, t, nelems)
if dim == 2
p = [p; zeros(1,nnodes)];
eltype = 5;
else
eltype = 10;
endif
## VTK-Points (mesh nodes)
fprintf (fid, "<Points>\n");
fprintf (fid, "<DataArray type=""Float64"" Name=""Array"" NumberOfComponents=""3"" format=""ascii"">\n");
fprintf (fid, "%.17g %.17g %.17g\n", p);
fprintf (fid, "</DataArray>\n");
fprintf (fid, "</Points>\n");
## VTK-Cells (mesh elements)
fprintf (fid, "<Cells>\n");
fprintf (fid, "<DataArray type=""Int32"" Name=""connectivity"" format=""ascii"">\n");
if dim == 2
fprintf (fid, "%d %d %d \n", t);
else
fprintf (fid, "%d %d %d %d \n", t);
endif
fprintf (fid, "</DataArray>\n");
fprintf (fid, "<DataArray type=""Int32"" Name=""offsets"" format=""ascii"">\n");
fprintf (fid, "%d %d %d %d %d %d\n", (dim+1):(dim+1):((dim+1)*nelems));
fprintf (fid, "</DataArray>\n");
fprintf (fid, "<DataArray type=""Int32"" Name=""types"" format=""ascii"">\n");
fprintf (fid, "%d %d %d %d %d %d\n", eltype*ones(nelems,1));
fprintf (fid, "</DataArray>\n");
fprintf (fid, "</Cells>\n");
endfunction
## Print DataPoints
function print_data_points (fid, nodedata, nnodes)
## # of data to print in
## <PointData> field
nvdata = size (nodedata, 1);
if (nvdata)
fprintf (fid, "<PointData>\n");
for ii = 1:nvdata
data = nodedata{ii,1};
dataname = nodedata{ii,2};
nsamples = rows (data);
ncomp = columns (data);
if (nsamples != nnodes)
error ("fpl_vtk_write_field: wrong number of samples in <PointData> ""%s""", dataname);
endif
fprintf (fid, "<DataArray type=""Float64"" Name=""%s"" ", dataname);
fprintf (fid, "NumberOfComponents=""%d"" format=""ascii"">\n", ncomp);
fprintf (fid, "%.17g ", data.');
fprintf (fid, "\n");
fprintf (fid, "</DataArray>\n");
endfor
fprintf (fid, "</PointData>\n");
endif
endfunction
function print_cell_data (fid, celldata, nelems)
## # of data to print in
## <CellData> field
nvdata = size (celldata, 1);
if (nvdata)
fprintf (fid, "<CellData>\n");
for ii = 1:nvdata
data = celldata{ii,1};
dataname = celldata{ii,2};
nsamples = rows(data);
ncomp = columns(data);
if nsamples != nelems
error ("fpl_vtk_write_field: wrong number of samples in <CellData> ""%s""", dataname);
endif
fprintf (fid, "<DataArray type=""Float64"" Name=""%s"" ", dataname);
fprintf (fid, "NumberOfComponents=""%d"" format=""ascii"">\n", ncomp);
fprintf (fid, "%.17g ", data.');
fprintf (fid, "\n");
fprintf (fid, "</DataArray>\n");
endfor
fprintf (fid, "</CellData>\n");
endif
endfunction
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