function hovmuller(hisfile,gridfile,lonsec,latsec,vname,tindices,vlevel,...
                   coef,colmin,colmax,ncol,xmin,xmax,tmin,tmax,pltstyle)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Get an Hovmuller diagram
%
%  Further Information:  
%  http://www.croco-ocean.org
%  
%  This file is part of CROCOTOOLS
%
%  CROCOTOOLS 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.
%
%  CROCOTOOLS 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, write to the Free Software
%  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
%  MA  02111-1307  USA
%
%  Copyright (c) 2002-2006 by Pierrick Penven 
%  e-mail:Pierrick.Penven@ird.fr  
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%
% Defaults values
%
if nargin < 1
  error('You must specify a file name')
end
if nargin < 2
  gridfile=hisfile;
  disp('Default grid name: ',gridfile)
end
if nargin < 3
  lonsec=[];
end
if nargin < 4
  latsec=[];
end
if nargin < 5
  vname='temp';
  disp('Default variable to plot: ',vname)
end
if nargin < 6
  tindices=[1:4];
  disp('Default time indices: ',num2str(tindices))
end
if nargin < 7
  vlevel=-10;
  disp('Default vertical level: ',num2str(vlevel))
end
if nargin < 8
  coef=1;
end
if nargin < 9
  colmin=[];
end
if nargin < 10
  colmax=[];
end
if nargin < 11
  ncol=10;
end
if nargin < 12
  xmin=[];
end
if nargin < 13
  xmax=[];
end
if nargin < 14
  tmin=[];
end
if nargin < 15
  tmax=[];
end
if nargin < 16
  pltstyle=1;
end
%
% Get default values
%
if isempty(gridfile)
  gridfile=hisfile;
end
if isempty(lonsec) | isempty(latsec)
  [lat,lon,mask]=read_latlonmask(gridfile,'r');
  latsec=mean(mean(lat));
  lonsec=[min(min(lon)) max(max(lon))];
end
if isempty(vlevel)
 vlevel=-10;
end
%
% Get the section
%
[x,t,var]=get_xt(hisfile,gridfile,lonsec,latsec,...
                   vname,tindices,vlevel);
%
% Colors
%
maxvar=max(max(var));
minvar=min(min(var));
if isempty(colmin)
  colmin=minvar;
end
if isempty(colmax)
  colmax=maxvar;
end
%
% Domain size
%
if isempty(xmin)
  xmin=min(min(x));
end
if isempty(xmax)
  xmax=max(max(x));
end
%
% Time
%
if isempty(tmin)
  tmin=min(min(t));
end
if isempty(tmax)
  tmax=max(max(t));
end
%
% Do the contours
%
if maxvar>minvar
  if pltstyle==1
    pcolor(x,t,var);
    ncol=128;
  elseif pltstyle==2
    contourf(x,t,var,...
    [colmin:(colmax-colmin)...
    /ncol:colmax]);
  elseif pltstyle==3
    [C,h1]=contour(x,t,var,...
    [colmin:(colmax-colmin)...
    /ncol:colmax],'k');
     clabel(C,h1,'LabelSpacing',1000,'Rotation',0)
  elseif pltstyle==4
   dcol=(colmax-colmin)/ncol;
   if minvar <0 
     [C11,h11]=contourf(x,t,var,[minvar 0]);
      caxis([minvar 0]);
   end
   if colmin < 0
     if minvar < 0 
       hold on
     end
     val=[colmin:dcol:min([colmax -dcol])];
     if length(val)<2
       val=[colmin colmin];
     end  
     [C12,h12]=contour(x,t,var,val,'k');
     if ~isempty(h12)
       clabel(C12,h12,'LabelSpacing',1000,'Rotation',0)
       set(h12,'LineStyle',':')
     end
     hold off
   end
   if colmax > 0
     if colmin < 0 | minvar < 0
       hold on
     end
     val=[max([dcol colmin]):dcol:colmax];
     if length(val)<2
       val=[colmax colmax];
     end  
     [C13,h13]=contour(x,t,var,val,'k');
     if ~isempty(h13)
       clabel(C13,h13,'LabelSpacing',1000,'Rotation',0)
     end
     hold off 
   end
   hold on
   [C10,h10]=contour(x,t,var,[0 0],'k');
   if ~isempty(h10)
     clabel(C10,h10,'LabelSpacing',1000,'Rotation',0)
     set(h10,'LineWidth',1.2)
   end
   hold off
   map=0.9+zeros(64,3);
   map2=1+zeros(32,3);
   map(33:64,:)=map2;
   colormap(map)
  end
  if pltstyle<=2
    caxis([colmin colmax])
    shading flat
    colormap(jet)
    colorbar
  end
  axis([xmin xmax tmin tmax])
end
xlabel('Position along the section [km]')
ylabel('Time indices')
title([vname])