%% Copyright (c) 2011, INRA
%% 2003-2011, David Legland <david.legland@grignon.inra.fr>
%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
%%
%% All rights reserved.
%% (simplified BSD License)
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%% Redistribution and use in source and binary forms, with or without
%% modification, are permitted provided that the following conditions are met:
%%
%% 1. Redistributions of source code must retain the above copyright notice, this
%%    list of conditions and the following disclaimer.
%%     
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%%    this list of conditions and the following disclaimer in the documentation
%%    and/or other materials provided with the distribution.
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%% -*- texinfo -*-
%% @deftypefn {Function File} drawLabels (@var{x}, @var{y}, @var{lbl})
%% @deftypefnx {Function File} drawLabels (@var{pos}, @var{lbl})
%% @deftypefnx {Function File} drawLabels (@dots{}, @var{numbers}, @var{format})
%% Draw labels at specified positions.
%%   
%%   DRAWLABELS(X, Y, LBL) draw labels LBL at position X and Y.
%%   LBL can be either a string array, or a number array. In this case,
%%   string are created by using sprintf function, with '%.2f' mask.
%%
%%   DRAWLABELS(POS, LBL) draw labels LBL at position specified by POS,
%%   where POS is a N*2 int array.
%%
%%   DRAWLABELS(..., NUMBERS, FORMAT) create labels using sprintf function,
%%   with the mask given by FORMAT (e. g. '%03d' or '5.3f'), and the
%%   corresponding values.
%% @end deftypefn

function varargout = drawLabels(varargin)

  % check if enough inputs are given
  if isempty(varargin)
      error('wrong number of arguments in drawLabels');
  end

  % process input parameters
  var = varargin{1};
  if size(var, 2)==1
      if length(varargin)<3
          error('wrong number of arguments in drawLabels');
      end
      px  = var;
      py  = varargin{2};
      lbl = varargin{3};
      varargin(1:3) = [];
  else
      if length(varargin)<2
          error('wrong number of arguments in drawLabels');
      end
      px  = var(:,1);
      py  = var(:,2);
      lbl = varargin{2};
      varargin(1:2) = [];
  end

  format = '%.2f';
  if ~isempty(varargin)
      format = varargin{1};
  end
  if size(format, 1)==1 && size(px, 1)>1
      format = repmat(format, size(px, 1), 1);
  end

  labels = cell(length(px), 1);
  if isnumeric(lbl)
      for i=1:length(px)
          labels{i} = sprintf(format(i,:), lbl(i));
      end
  elseif ischar(lbl)
      for i=1:length(px)
          labels{i} = lbl(i,:);
      end
  elseif iscell(lbl)
      labels = lbl;
  end
  labels = char(labels);

  h = text(px, py, labels);

  if nargout>0
      varargout{1}=h;
  end

endfunction

