% PLOTERP - plot a selected multichannel data epoch on a common timebase
%
% Usage: >> ploterp(data,frames,epoch,[limits],'title',[plotchans]);
%
% Inputs:
%  data       = EEG/ERP data epoch (chans,frames)
%  frames     = frames per epoch {default: data length}
%  epoch      = epoch to plot {default: 1}
%  [limits]   = [xmin xmax ymin ymax]  (x's in ms) 
%                   {def|0 or both y's 0 -> data limits}
% 'title'     = plot title {default|0 -> none}
%  plotchans  = data channels to plot {default|0 -> all}
%
% Author: Scott Makeig, SCCN/INC/UCSD, La Jolla, 6-11-98 
%
% See also: TIMTOPO

% Copyright (C) 6-11-98 from PLOTDATA Scott Makeig, SCCN/INC/UCSD,
% scott@sccn.ucsd.edu
%
% This file is part of EEGLAB, see http://www.eeglab.org
% for the documentation and details.
%
% 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.
%
% 2. Redistributions in binary form must reproduce the above copyright notice,
% this list of conditions and the following disclaimer in the documentation
% and/or other materials provided with the distribution.
%
% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
% THE POSSIBILITY OF SUCH DAMAGE.

% 01-25-02 reformated help & license, added links -ad 

function plot_handl = ploterp(data,frames,epoch,limits,titl,plotchans)

LABELFONT = 16;
TICKFONT = 14;
TITLEFONT = 16;

if nargin < 1
   help ploterp
   return
end

[chans,framestot] = size(data);
icadefs;   

if nargin < 6
   plotchans = 0;
end
if plotchans==0
   plotchans = 1:chans;
end

if nargin < 5,
   titl = '';     % DEFAULT TITLE
end

if nargin < 4,
    limits = 0;
end

if nargin < 3
  epoch = 0;
end
if epoch == 0
  epoch = 1;
end

if nargin<2
 frames = 0;
end
if frames == 0
 frames = size(data,2);
end
if floor(framestot/frames)*frames ~= framestot
  fprintf('ploterp(): frames argument does not divide data length.\n');
  return
end
if epoch*frames > framestot
  fprintf('ploterp(): data does not contain %d epochs of %d frames.\n',epoch,frames);
  return
end

%
%%%%%%%%%%%%%%%%%%%%%%% Read and adjust limits %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
  if limits==0,      % == 0 or [0 0 0 0]
    xmin=0;
    xmax=frames-1;
    ymin=min(min(data));
    ymax=max(max(data));
  else
    if length(limits)~=4,
      fprintf( ...
       'ploterp: limits should be 0 or an array [xmin xmax ymin ymax].\n');
      return
    end
    xmin = limits(1);
    xmax = limits(2);
    ymin = limits(3);
    ymax = limits(4);
  end

  if xmax == 0 && xmin == 0,
    x = (0:1:frames-1);
    xmin = 0;
    xmax = frames-1;
  else
    dx = (xmax-xmin)/(frames-1);
    x=xmin*ones(1,frames)+dx*(0:frames-1); % compute x-values
  end
  if xmax<=xmin,
      fprintf('ploterp() - xmax must be > xmin.\n')
      return
  end

  if ymax == 0 && ymin == 0,
      ymax=max(max(data));
      ymin=min(min(data));
  end
  if ymax<=ymin,
      fprintf('ploterp() - ymax must be > ymin.\n')
      return
  end

sampint = (xmax-xmin)/(frames-1); % sampling interval = 1000/srate;
x = xmin:sampint:xmax;   % make vector of x-values

%
%%%%%%%%%%%%%%%%%%%%%%% Plot the data %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
cla % clear the current figure axes
set(gca,'YColor',BACKCOLOR); % set the background color
set(gca,'Color',BACKCOLOR);

set(gca,'GridLineStyle',':')
set(gca,'Xgrid','off')
set(gca,'Ygrid','on')
set(gca,'Color',BACKCOLOR,'FontSize',TICKFONT,'FontWeight','bold');
plot_handl=plot(x,data(plotchans,(epoch-1)*frames+1:epoch*frames));    % plot the data
title(titl,'fontsize',TITLEFONT,'FontWeight','bold');

l= xlabel('Time (ms)');
set(l,'FontSize',LABELFONT,'FontWeight','bold');
l=ylabel('Potential (uV)');
set(l,'FontSize',LABELFONT,'FontWeight','bold');
axis([xmin xmax ymin ymax]);