%% (Internal) Plot a line with text in a graphic
%
%     text_line_handles = text_line( x, y, text_str, text_line_prop_vals, axes_hdl )
% 
% Arguments:
% 
%   + x, y: coordinates for the arrow.
% 
%   + text_str: string to display.
% 
%   + text_line_prop_vals: properties names/values to set. A cell with
%   prop. names in col 1 and prop vals in col 2.
% 
%   + axes_hdl: the axe handle to plot the arrow.
% 
% Output:
% 
%   + text_line_handles: handles of the plotted arrow.
% 
% See also plot_ecg_mosaic
% 
% Author: Mariano Llamedo Soria (llamedom at {electron.frba.utn.edu.ar; unizar.es}
% Version: 0.1 beta
% Birthdate: 21/7/2010
% Last update: 20/02/2013
% Copyright 2008-2015
% 
function text_line_handles = text_line( x, y, text_str, text_line_prop_vals, axes_hdl )

    %% interface
    k_length = 0.1;
    
    if(nargin < 3 || isempty(text_str) || ~ischar(text_str) )
        text_str = '';
    end

    if(nargin < 4 || ~iscell(text_line_prop_vals) )
        text_line_prop_vals = [];
    end
    
    if(nargin < 5 || isempty(axes_hdl) )
        axes_hdl = gca;
    end

    bStr = strcmpi('String', text_line_prop_vals(:,1));
    if( isempty(text_line_prop_vals{bStr,2}) )
        text_line_handles = [];
    else
        text_line_handles = text_arrow(x(1), y(1), '', text_line_prop_vals, axes_hdl);
    end
    
    hold(axes_hdl, 'on');

    aux_hdl = plot( x, y );

    hold(axes_hdl, 'off');
    
    [~, aux_idx] = setdiff(text_line_prop_vals(:,1), {'String' 'TextColor'});
    
    set( aux_hdl, text_line_prop_vals(aux_idx,1)', text_line_prop_vals(aux_idx,2)' );
    this_colour = get(aux_hdl, 'Color');
    set( aux_hdl, {'Marker' 'MarkerSize' 'MarkerFaceColor' 'MarkerEdgeColor' }, {'diamond' 2 this_colour this_colour} );

% los arrows de matlab son muy lentos
%     aux_hdl = arrow( [x(1) y(1)], [x(2) y(2)], 2, 0.5, [0 0 0], axes_hdl );
% 
%     bStr = strcmpi('String', text_line_prop_vals(:,1)) | strcmpi('TextColor', text_line_prop_vals(:,1));
%     
%     set( aux_hdl, text_line_prop_vals(~bStr,1)', text_line_prop_vals(~bStr,2)' );
%     
%     set( aux_hdl, {'Head1Style' 'Head2Style' }, {'diamond' 'diamond'} );
%     set( aux_hdl, {'Head1Width' 'Head2Width' 'Head1Length' 'Head2Length' }, {2 2 2 2} );
    
    text_line_handles = [ text_line_handles aux_hdl ];