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ENH Add log scale to view_leadfields figure #337

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ENH Add log scale to view_leadfields figure #337

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50 changes: 39 additions & 11 deletions toolbox/gui/view_leadfields.m
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Original file line number Diff line number Diff line change
Expand Up @@ -148,6 +148,8 @@
'Parent', hFig);

%% ===== DISPLAY LEADFIELD =====
useLogScale = false;
useLogScaleLegendMsg = 'Off';
% Current sensor
iChannel = 1;
DrawArrows();
Expand Down Expand Up @@ -201,16 +203,26 @@ function KeyPress_Callback(hFig, keyEvent)
if ~isempty(findobj(hAxes, 'Tag', 'allChannel'))
delete(findobj(hAxes, 'Tag', 'allChannel'))
end
case 'l'
if ismember('shift', keyEvent.Modifier)
useLogScale = ~useLogScale;
if (useLogScale)
useLogScaleLegendMsg = 'On';
else
useLogScaleLegendMsg = 'Off';
end
end
case 'h'
java_dialog('msgbox', ['<HTML><TABLE>' ...
'<TR><TD><B>Left arrow</B></TD><TD>Previous channel</TD></TR>' ....
'<TR><TD><B>Right arrow</B></TD><TD>Next channel</TD></TR>'....
'<TR><TD><B>Page up</B></TD><TD>Previous 10th channel</TD></TR>'....
'<TR><TD><B>Page down</B></TD><TD>Next 10th channel</TD></TR>'....
'<TR><TD><B>M</B></TD><TD>Change the <B>M</B>odality (MEG, EEG, SEEG, ECOG)</TD></TR>'....
'<TR><TD><B>R</B></TD><TD>Change the <B>R</B>eference electrode</TD></TR>'....
'<TR><TD><B>S</B></TD><TD>Show/hide the source grid</TR>'....
'<TR><TD><B>E</B></TD><TD>Show/hide the sensors</TD></TR></TABLE>'], 'Keyboard shortcuts');
'<TR><TD><B>Left arrow</B></TD><TD>Previous channel</TD></TR>' ...
'<TR><TD><B>Right arrow</B></TD><TD>Next channel</TD></TR>'...
'<TR><TD><B>Page up</B></TD><TD>Previous 10th channel</TD></TR>'...
'<TR><TD><B>Page down</B></TD><TD>Next 10th channel</TD></TR>'...
'<TR><TD><B>M</B></TD><TD>Change the <B>M</B>odality (MEG, EEG, SEEG, ECOG)</TD></TR>'...
'<TR><TD><B>R</B></TD><TD>Change the <B>R</B>eference electrode</TD></TR>'...
'<TR><TD><B>S</B></TD><TD>Show/hide the source grid</TR>'...
'<TR><TD><B>E</B></TD><TD>Show/hide the sensors</TD></TR>'...
'<TR><TD><B>Shift + l</B></TD><TD>Toggle on/off logarithmic scale</TD></TR></TABLE>'], 'Keyboard shortcuts');
otherwise
KeyPressFcn_bak(hQuiver, keyEvent);
return;
Expand Down Expand Up @@ -255,6 +267,9 @@ function DrawArrows()
end
% Display arrows
LeadField = reshape(LeadField,3,[])'; % each column is a vector
if(useLogScale)
LeadField = logScaledLeadField(LeadField);
end
hQuiver(iLF) = quiver3(...
HeadmodelMat{iLF}.GridLoc(:,1), HeadmodelMat{iLF}.GridLoc(:,2), HeadmodelMat{iLF}.GridLoc(:,3), ...
LeadField(:,1), LeadField(:,2), LeadField(:,3), ...
Expand Down Expand Up @@ -299,12 +314,12 @@ function DrawArrows()
end
% Title bar (channel name)
if isAvgRef
strTitle = sprintf('Channel #%d/%d (%s) | %s ref Channel = AvgRef', iChannel, length(Channels), Channels(iChannel).Name,selectedModality);
strTitle = sprintf('Channel #%d/%d (%s) | %s ref Channel = AvgRef | Log. scale %s', iChannel, length(Channels), Channels(iChannel).Name,selectedModality, useLogScaleLegendMsg);
else
strTitle = sprintf('Channel #%d/%d (%s) | %s ref Channel = %s', iChannel, length(Channels), Channels(iChannel).Name,selectedModality,Channels(iRef).Name);
strTitle = sprintf('Channel #%d/%d (%s) | %s ref Channel = %s | Log. scale %s', iChannel, length(Channels), Channels(iChannel).Name,selectedModality,Channels(iRef).Name, useLogScaleLegendMsg);
end
else
strTitle = sprintf('Channel #%d/%d (%s)', iChannel, length(Channels), Channels(iChannel).Name);
strTitle = sprintf('Channel #%d/%d (%s) | Log. scale %s', iChannel, length(Channels), Channels(iChannel).Name, useLogScaleLegendMsg);
end

if (iChannel == 1) && (length(Channels) > 1)
Expand Down Expand Up @@ -379,4 +394,17 @@ function DrawArrows()
LF_finale{iLF} = HeadmodelMat{iLF}.Gain(iChannels,:);
end
end

%% ===== LEADFIELD TO LOG SPACE =====
function lf_log = logScaledLeadField(lf)
lf_2 = lf.^2;
r = sqrt(sum(lf_2,2));
rho = sqrt(lf_2(:,1) + lf_2(:,2));
t = atan2(rho,lf(:,3));
f = atan2(lf(:,2),lf(:,1));
lf_log = [ log10(r) .* sin(t) .* cos(f) ...
log10(r) .* sin(t) .* sin(f) ...
log10(r) .* cos(t)];
end

end