function [cfg] = ft_topoplotER(cfg, varargin)

% FT_TOPOPLOTER plots the topographic distribution over the head of a 2-dimensional

% data representations such as the event-related potentials or fields, or a power

% or connectivity spectrum.

%

% Use as

% ft_topoplotER(cfg, timelock)

% or

% ft_topoplotER(cfg, freq)

%

% The data can be an ERP/ERF produced by FT_TIMELOCKANALYSIS, a power spectrum

% (without time dimension) produced by FT_FREQANALYSIS or a connectivity spectrum

% produced by FT_CONNECTIVITYANALYSIS. Also, the output to FT_FREQSTATISTICS and

% FT_TIMELOCKSTATISTICS can be visualised.

%

% The configuration can have the following parameters

% cfg.parameter = field that contains the data to be plotted as color, for example 'avg', 'powspctrm' or 'cohspctrm' (default is automatic)

% cfg.maskparameter = field in the data to be used for masking of data. It should have alues between 0 and 1, where 0 corresponds to transparent.

% cfg.xlim = limit for 1st dimension in data (e.g., time), can be 'maxmin' or [xmin xmax] (default = 'maxmin')

% cfg.zlim = limits for color dimension, 'maxmin', 'maxabs', 'zeromax', 'minzero', or [zmin zmax] (default = 'maxmin')

% cfg.channel = Nx1 cell-array with selection of channels (default = 'all'), see FT_CHANNELSELECTION for details

% cfg.refchannel = name of reference channel for visualising connectivity, can be 'gui'

% cfg.baseline = 'yes','no' or [time1 time2] (default = 'no'), see FT_TIMELOCKBASELINE or FT_FREQBASELINE

% cfg.baselinetype = 'absolute' or 'relative' (default = 'absolute')

% cfg.trials = 'all' or a selection given as a 1xN vector (default = 'all')

% cfg.colormap = string, or Nx3 matrix, see FT_COLORMAP

% cfg.marker = 'on', 'labels', 'numbers', 'off'

% cfg.markersymbol = channel marker symbol (default = 'o')

% cfg.markercolor = channel marker color (default = [0 0 0] (black))

% cfg.markersize = channel marker size (default = 2)

% cfg.markerfontsize = font size of channel labels (default = 8 pt)

% cfg.highlight = 'off', 'on', 'labels', 'numbers'

% cfg.highlightchannel = Nx1 cell-array with selection of channels, or vector containing channel indices see FT_CHANNELSELECTION

% cfg.highlightsymbol = highlight marker symbol (default = 'o')

% cfg.highlightcolor = highlight marker color (default = [0 0 0] (black))

% cfg.highlightsize = highlight marker size (default = 6)

% cfg.highlightfontsize = highlight marker size (default = 8)

% cfg.hotkeys = enables hotkeys (pageup/pagedown/m) for dynamic zoom and translation (ctrl+) of the color limits

% cfg.colorbar = whether to show a colorbar alongside the figure (default = 'no')

% 'no' do not show a colorbar

% 'yes' at the default MATLAB location

% 'North' inside plot box near top

% 'South' inside bottom

% 'East' inside right

% 'West' inside left

% 'NorthOutside' outside plot box near top

% 'SouthOutside' outside bottom

% 'EastOutside' outside right

% 'WestOutside' outside left

% cfg.colorbartext = string indicating the text next to colorbar

% cfg.interplimits = limits for interpolation (default = 'head')

% 'sensors' to furthest sensor

% 'head' to edge of head

% cfg.interpolation = 'linear', 'cubic', 'nearest', 'v4' (default = 'v4') see GRIDDATA

% cfg.style = plot style (default = 'both')

% 'straight' colormap only

% 'contour' contour lines only

% 'both' both colormap and contour lines

% 'fill' constant color between lines

% 'blank' only the head shape

% 'straight_imsat' colormap only, vector-graphics friendly

% 'both_imsat' both colormap and contour lines, vector-graphics friendly

% cfg.gridscale = scaling grid size that determines resolution of figure (default = 67)

% cfg.shading = 'flat' or 'interp' (default = 'flat')

% cfg.comment = 'no', 'auto' or 'xlim' (default = 'auto')

% 'auto': date, xparam and zparam limits are printed

% 'xlim': only xparam limits are printed

% cfg.commentpos = string or two numbers, position of the comment (default = 'leftbottom')

% 'lefttop' 'leftbottom' 'middletop' 'middlebottom' 'righttop' 'rightbottom'

% 'title' to place comment as title

% 'layout' to place comment as specified for COMNT in layout

% [x y] coordinates

% cfg.interactive = Interactive plot 'yes' or 'no' (default = 'yes')

% In a interactive plot you can select areas and produce a new

% interactive plot when a selected area is clicked. Multiple areas

% can be selected by holding down the SHIFT key.

% cfg.directionality = '', 'inflow' or 'outflow' specifies for

% connectivity measures whether the inflow into a

% node, or the outflow from a node is plotted. The

% (default) behavior of this option depends on the dimord

% of the input data (see below).

% cfg.layout = specify the channel layout for plotting using one of the supported ways (see below).

% cfg.interpolatenan = 'yes' or 'no', whether to interpolate over channels containing NaNs (default = 'yes')

% cfg.figure = 'yes' or 'no', whether to open a new figure. You can also specify a figure handle from FIGURE, GCF or SUBPLOT. (default = 'yes')

%

% For the plotting of directional connectivity data the cfg.directionality option

% determines what is plotted. The default value and the supported functionality

% depend on the dimord of the input data. If the input data is of dimord

% 'chan_chan_XXX', the value of directionality determines whether, given the

% reference channel(s), the columns (inflow), or rows (outflow) are selected for

% plotting. In this situation the default is 'inflow'. Note that for undirected

% measures, inflow and outflow should give the same output. If the input data is of

% dimord 'chancmb_XXX', the value of directionality determines whether the rows in

% data.labelcmb are selected. With 'inflow' the rows are selected if the

% refchannel(s) occur in the right column, with 'outflow' the rows are selected if

% the refchannel(s) occur in the left column of the labelcmb-field. Default in this

% case is '', which means that all rows are selected in which the refchannel(s)

% occur. This is to robustly support linearly indexed undirected connectivity

% metrics. In the situation where undirected connectivity measures are linearly

% indexed, specifying 'inflow' or 'outflow' can result in unexpected behavior.

%

% The layout defines how the channels are arranged. You can specify the

% layout in a variety of ways:

% - you can provide a pre-computed layout structure, see FT_PREPARE_LAYOUT

% - you can give the name of an ascii layout file with extension *.lay

% - you can give the name of an electrode file

% - you can give an electrode definition, i.e. "elec" structure

% - you can give a gradiometer definition, i.e. "grad" structure

% If you do not specify any of these and the data structure contains an

% electrode or gradiometer structure, that will be used for creating a

% layout. If you want to have more fine-grained control over the layout

% of the subplots, you should create your own layout file.

%

% See also FT_SINGLEPLOTER, FT_MULTIPLOTER, FT_SINGLEPLOTTFR, FT_MULTIPLOTTFR,

% FT_TOPOPLOTTFR, FT_PREPARE_LAYOUT

% Undocumented options:

%

% It is possible to use multiple highlight-selections (e.g.: multiple

% statistical clusters of channels) To do this, all the content of

% the highlight-options (including cfg.highlight) should be placed

% in a cell-array (even if the normal content was already in a

% cell-array). Specific marker settings (e.g. color, size) are defaulted

% when not present.

%

% Example (3 selections):

% cfg.highlight = {'labels', 'labels', 'numbers'}

% cfg.highlightchannel = {{'MZF03','MZC01','MRT54'}, [1:5], 'C*'}

% cfg.highlightsymbol = {'o',[],'+'} % the empty option will be defaulted

% cfg.highlightcolor = {'r',[0 0 1]}; % the missing option will be defaulted

% cfg.highlightsize = []; % will be set to default, as will the missing cfg.highlightfontsize

%

% Other options:

% cfg.labeloffset (offset of labels to their marker, default = 0.005)

% Copyright (C) 2005-2020, F.C. Donders Centre

%

% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org

% for the documentation and details.

%

% FieldTrip 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.

%

% FieldTrip 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 FieldTrip. If not, see <http://www.gnu.org/licenses/>.

%

% $Id$

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% DEVELOPERS NOTE: This code is organized in a similar fashion for multiplot/singleplot/topoplot

% and for ER/TFR and should remain consistent over those 6 functions.

% Section 1: general cfg handling that is independent from the data

% Section 2: data handling, this also includes converting bivariate (chan_chan and chancmb) into univariate data

% Section 3: cfg handling that depends on the data

% Section 4: actual plotting

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% Section 1: general cfg handling that is independent from the data

% these are used by the ft_preamble/ft_postamble function and scripts

ft_revision = '$Id$';

ft_nargin = nargin;

ft_nargout = nargout;

% do the general setup of the function

ft_defaults

ft_preamble init

ft_preamble debug

ft_preamble loadvar varargin

ft_preamble provenance varargin

% the ft_abort variable is set to true or false in ft_preamble_init

if ft_abort

return

end

% check if the input cfg is valid for this function

cfg = ft_checkconfig(cfg, 'renamed', {'latency', 'xlim'});

cfg = ft_checkconfig(cfg, 'renamed', {'frequency', 'xlim'});

cfg = ft_checkconfig(cfg, 'renamedval', {'interplimits', 'electrodes', 'sensors'});

% this is needed for the figure title

if isfield(cfg, 'dataname') && ~isempty(cfg.dataname)

dataname = cfg.dataname;

elseif isfield(cfg, 'inputfile') && ~isempty(cfg.inputfile)

dataname = cfg.inputfile;

elseif nargin>1

dataname = arrayfun(@inputname, 2:nargin, 'UniformOutput', false);

else

dataname = {};

end

% make sure figure window titles are labeled appropriately, pass this onto the actual plotting function

cfg.funcname = mfilename;

cfg.dataname = dataname;

% prepare the layout, this should be done only once

tmpcfg = keepfields(cfg, {'layout', 'channel', 'rows', 'columns', 'commentpos', 'skipcomnt', 'scalepos', 'skipscale', 'projection', 'viewpoint', 'rotate', 'width', 'height', 'elec', 'grad', 'opto', 'linecolor', 'showcallinfo', 'trackcallinfo', 'trackusage', 'trackdatainfo', 'trackmeminfo', 'tracktimeinfo', 'checksize'});

cfg.layout = ft_prepare_layout(tmpcfg, varargin{1});

% call the common function that is shared between ft_topoplotER and ft_topoplotTFR

cfg = topoplot_common(cfg, varargin{:});

% remove this field again, it is only used for figure labels

cfg = removefields(cfg, 'funcname');

% do the general cleanup and bookkeeping at the end of the function

ft_postamble debug

ft_postamble previous varargin

ft_postamble provenance

ft_postamble savefig

% add a menu to the figure, but only if the current figure does not have subplots

menu_fieldtrip(gcf, cfg, false);

if ~ft_nargout

% don't return anything

clear cfg

end