因论文需要，需要在脑电地形图上加入红点来标注电极，于是自己改进实现了一下新功能，加入新功能效果如下：
调用方式：
figure; plotData = rand(1,59); topoplotEEG(plotData,'channel_locations_59ch.txt','electrodes','on','onlymark', [1 3 5 7 9]);
topoplotEEG代码：
% topoplot() - plot a topographic map of an EEG field as a 2-D
% circular view (looking down at the top of the head)
% using cointerpolation on a fine cartesian grid.
% Usage:
% >> topoplot(datavector,'eloc_file');
% >> topoplot(datavector,'eloc_file', 'Param1','Value1', ...)
% Inputs:
% datavector = vector of values at the corresponding locations.
% 'eloc_file' = name of an EEG electrode position file {0 -> 'chan_file'}
%
% Optional Parameters & Values (in any order):
% Param Value
% 'colormap' - any sized colormap
% 'interplimits' - 'electrodes' to furthest electrode
% 'head' to edge of head
% {default 'head'}
% 'gridscale' - scaling grid size {default 67}
% 'maplimits' - 'absmax' +/- the absolute-max
% 'maxmin' scale to data range
% [clim1,clim2] user-definined lo/hi
% {default = 'absmax'}
% 'style' - 'straight' colormap only
% 'contour' contour lines only
% 'both' both colormap and contour lines
% 'fill' constant color between lines
% 'blank' just head and electrodes
% {default = 'both'}
% 'numcontour' - number of contour lines
% {default = 6}
% 'shading' - 'flat','interp' {default = 'flat'}
% 'headcolor' - Color of head cartoon {default black}
% 'electrodes' - 'on','off','labels','numbers'
% 'efontsize','electcolor','emarker','emarkersize' - details
%
% Note: topoplot() only works when map limits are >= the max and min
% interpolated data values.
% Eloc_file format:
% chan_number degrees radius reject_level amp_gain channel_name
% (Angle-0 = Cz-to-Fz; C3-angle =-90; Radius at edge of image = 0.5)
%
% For a sample eloc file: >> topoplot('example')
%
% Note: topoplot() will ignore any electrode with a position outside
% the head (radius > 0.5)
% Topoplot Version 2.1
% Begun by Andy Spydell, NHRC, 7-23-96
% 8-96 Revised by Colin Humphries, CNL / Salk Institute, La Jolla CA
% -changed surf command to imagesc (faster)
% -can now handle arbitrary scaling of electrode distances
% -can now handle non integer angles in eloc_file
% 4-4-97 Revised again by Colin Humphries, reformat by SM
% -added parameters
% -changed eloc_file format
% 2-26-98 Revised by Colin
% -changed image back to surface command
% -added fill and blank styles
% -removed extra background colormap entry (now use any colormap)
% -added parameters for electrode colors and labels
% -now each topoplot axes use the caxis command again.
% -removed OUTPUT parameter
% 3-11-98 changed default emarkersize, improve help msg -sm
function handle = topoplot(Vl,loc_file,p1,v1,p2,v2,p3,v3,p4,v4,p5,v5,p6,v6,p7,v7,p8,v8,p9,v9,p10,v10)
% User Defined Defaults:
MAXCHANS = 256;
DEFAULT_ELOC = 'eloc64.txt';
INTERPLIMITS = 'head'; % head, electrodes
MAPLIMITS = 'absmax'; % absmax, maxmin, [values]
GRID_SCALE = 67;
CONTOURNUM = 6;
STYLE = 'both'; % both,straight,fill,contour,blank
HCOLOR = [0 0 0];
ECOLOR = [0 0 0];
CONTCOLOR = [0 0 0];
ELECTROD = 'on'; % ON OFF LABEL
EMARKERSIZE = 6;
EFSIZE = get(0,'DefaultAxesFontSize');
HLINEWIDTH = 2;
EMARKER = '.';
SHADING = 'flat'; % flat or interp
MARKIDX = NaN;
%%%%%%%%%%%%%%%%%%%%%%%
nargs = nargin;
if nargs < 2
loc_file = DEFAULT_ELOC;
end
if nargs == 1
if isstr(Vl)
if any(strcmp(lower(Vl),{'example','demo'}))
fprintf(['This is an example of an electrode location file,\n',...
'an ascii file consisting of the following four columns:\n',...
' channel_number degrees arc_length channel_name\n\n',...
'Example:\n',...
' 1 -18 .352 Fp1.\n',...
' 2 18 .352 Fp2.\n',...
' 5 -90 .181 C3..\n',...
' 6 90 .181 C4..\n',...
' 7 -90 .500 A1..\n',...
' 8 90 .500 A2..\n',...
' 9 -142 .231 P3..\n',...
'10 142 .231 P4..\n',...
'11 0 .181 Fz..\n',...
'12 0 0 Cz..\n',...
'13 180 .181 Pz..\n\n',...
'The model head sphere has a diameter of 1.\n',...
'The vertex (Cz) has arc length 0. Channels with arc \n',...
'lengths > 0.5 are not plotted nor used for interpolation.\n'...
'Zero degrees is towards the nasion. Positive angles\n',...
'point to the right hemisphere; negative to the left.\n',...
'Channel names should each be four chars, padded with\n',...
'periods (in place of spaces).\n'])
return
end
end
end
if isempty(loc_file)
loc_file = 0;
end
if loc_file == 0
loc_file = DEFAULT_ELOC;
end
if nargs > 2
if ~(round(nargs/2) == nargs/2)
error('topoplot(): Odd number of inputs?')
end
for i = 3:2:nargs
Param = eval(['p',int2str((i-3)/2 +1)]);
Value = eval(['v',int2str((i-3)/2 +1)]);
if ~isstr(Param)
error('topoplot(): Parameter must be a string')
end
Param = lower(Param);
switch lower(Param)
case 'colormap'
if size(Value,2)~=3
error('topoplot(): Colormap must be a n x 3 matrix')
end
colormap(Value)
case {'interplimits','headlimits'}
if ~isstr(Value)
error('topoplot(): interplimits value must be a string')
end
Value = lower(Value);
if ~strcmp(Value,'electrodes') & ~strcmp(Value,'head')
error('topoplot(): Incorrect value for interplimits')
end
INTERPLIMITS = Value;
case 'maplimits'
MAPLIMITS = Value;
case 'gridscale'
GRID_SCALE = Value;
case 'style'
STYLE = lower(Value);
case 'numcontour'
CONTOURNUM = Value;
case 'electrodes'
ELECTROD = lower(Value);
case 'emarker'
EMARKER = Value;
case {'headcolor','hcolor'}
HCOLOR = Value;
case {'electcolor','ecolor'}
ECOLOR = Value;
case {'emarkersize','emsize'}
EMARKERSIZE = Value;
case {'efontsize','efsize'}
EFSIZE = Value;
case 'shading'
SHADING = lower(Value);
if ~any(strcmp(SHADING,{'flat','interp'}))
error('Invalid Shading Parameter')
end
case 'onlymark'
MARKIDX = Value;
otherwise
error('Unknown parameter.')
end
end
end
[r,c] = size(Vl);
if r>1 & c>1,
error('topoplot(): data should be a single vector\n');
end
fid = fopen(loc_file);
if fid<1,
fprintf('topoplot(): cannot open eloc_file (%s).\n',loc_file);
return
end
A = fscanf(fid,'%d %f %f %s',[7 MAXCHANS]);
fclose(fid);
A = A';
if length(Vl) ~= size(A,1),
fprintf(...
'topoplot(): data vector must have the same rows (%d) as eloc_file (%d)\n',...
length(Vl),size(A,1));
A
error('');
end
labels = setstr(A(:,4:7));
idx = find(labels == '.'); % some labels have dots
labels(idx) = setstr(abs(' ')*ones(size(idx))); % replace them with spaces
Th = pi/180*A(:,2); % convert degrees to radians
Rd = A(:,3);
ii = find(Rd <= 0.5); % interpolate on-head channels only
Th = Th(ii);
Rd = Rd(ii);
Vl = Vl(ii);
labels = labels(ii,:);
[x,y] = pol2cart(Th,Rd); % transform from polar to cartesian coordinates
rmax = 0.5;
ha = gca;
cla
hold on
if ~strcmp(STYLE,'blank')
% find limits for interpolation
if strcmp(INTERPLIMITS,'head')
xmin = min(-.5,min(x)); xmax = max(0.5,max(x));
ymin = min(-.5,min(y)); ymax = max(0.5,max(y));
else
xmin = max(-.5,min(x)); xmax = min(0.5,max(x));
ymin = max(-.5,min(y)); ymax = min(0.5,max(y));
end
xi = linspace(xmin,xmax,GRID_SCALE); % x-axis description (row vector)
yi = linspace(ymin,ymax,GRID_SCALE); % y-axis description (row vector)
% [Xi,Yi,Zi] = griddata(y,x,Vl,yi',xi,'invdist'); % Interpolate data
[Xi,Yi,Zi] = griddata(y,x,Vl,yi',xi,'v4');
% Take data within head
mask = (sqrt(Xi.^2+Yi.^2) <= rmax);
ii = find(mask == 0);
Zi(ii) = NaN;
% calculate colormap limits
m = size(colormap,1);
if isstr(MAPLIMITS)
if strcmp(MAPLIMITS,'absmax')
amin = -max(max(abs(Zi)));
amax = max(max(abs(Zi)));
elseif strcmp(MAPLIMITS,'maxmin')
amin = min(min(Zi));
amax = max(max(Zi));
end
else
amin = MAPLIMITS(1);
amax = MAPLIMITS(2);
end
delta = xi(2)-xi(1); % length of grid entry
% Draw topoplot on head
if strcmp(STYLE,'contour')
contour(Xi,Yi,Zi,CONTOURNUM,'k');
elseif strcmp(STYLE,'both')
if sum(isnan(MARKIDX))
surface(Xi-delta/2,Yi-delta/2,zeros(size(Zi)),Zi,'EdgeColor','none',...
'FaceColor',SHADING);
% colorbar;
contour(Xi,Yi,Zi,CONTOURNUM,'k');
end
elseif strcmp(STYLE,'straight')
surface(Xi-delta/2,Yi-delta/2,zeros(size(Zi)),Zi,'EdgeColor','none',...
'FaceColor',SHADING);
% colorbar
elseif strcmp(STYLE,'fill')
contourf(Xi,Yi,Zi,CONTOURNUM,'k');
else
error('Invalid style')
end
caxis([amin amax]) % set coloraxis
end
set(ha,'Xlim',[-rmax*1.3 rmax*1.3],'Ylim',[-rmax*1.3 rmax*1.3])
% %%% Draw Head %%%%
l = 0:2*pi/100:2*pi;
basex = .18*rmax;
tip = rmax*1.15; base = rmax-.004;
EarX = [.497 .510 .518 .5299 .5419 .54 .547 .532 .510 .489];
EarY = [.0555 .0775 .0783 .0746 .0555 -.0055 -.0932 -.1313 -.1384 -.1199];
% Plot Head, Ears, Nose
plot(cos(l).*rmax,sin(l).*rmax,...
'color',HCOLOR,'Linestyle','-','LineWidth',HLINEWIDTH);
plot([.18*rmax;0;-.18*rmax],[base;tip;base],...
'Color',HCOLOR,'LineWidth',HLINEWIDTH);
plot(EarX,EarY,'color',HCOLOR,'LineWidth',HLINEWIDTH)
plot(-EarX,EarY,'color',HCOLOR,'LineWidth',HLINEWIDTH)
% Plot Electrodes
if strcmp(ELECTROD,'on')
if sum(isnan(MARKIDX))
hp2 = plot(y,x,EMARKER,'Color',ECOLOR,'markersize',EMARKERSIZE);
else
markedIdx = false(numel(y),1);
markedIdx(MARKIDX) = true;
hp2 = plot(y(~markedIdx),x(~markedIdx),EMARKER,'Color',ECOLOR,'markersize',EMARKERSIZE);
hp2 = plot(y(markedIdx),x(markedIdx),EMARKER,'Color','r','markersize',3*EMARKERSIZE);
end
elseif strcmp(ELECTROD,'labels')
for i = 1:size(labels,1)
text(y(i),x(i),labels(i,:),'HorizontalAlignment','center',...
'VerticalAlignment','middle','Color',ECOLOR,...
'FontSize',EFSIZE)
end
elseif strcmp(ELECTROD,'numbers')
whos y x
for i = 1:size(labels,1)
text(y(i),x(i),int2str(i),'HorizontalAlignment','center',...
'VerticalAlignment','middle','Color',ECOLOR,...
'FontSize',EFSIZE)
end
end
hold off
axis off