Update: MEG sensors display correct location (#637)

* update the MEG sensors display, this PR allow the discpaly the correct postion of the sensor and not the intergation points

* Remove old code and add comment

toolbox/gui/view_leadfield_vectors.m

@@ -407,7 +407,8 @@ function DrawArrows()
  delete(findobj(hAxes, '-depth', 1, 'Tag', 'SelChannel'));
  % Plot selected sensor
  if ~isempty(Channels(iChannel).Loc) && ~ismember(Channels(iChannel).Name, {'EEG','MEG','MEG MAG', 'MEG GRAD'})
- line(Channels(iChannel).Loc(1,1), Channels(iChannel).Loc(2,1), Channels(iChannel).Loc(3,1), ...
+ % Center of mass of all coordinates
+ line(mean(Channels(iChannel).Loc(1,:),2), mean(Channels(iChannel).Loc(2,:),2), mean(Channels(iChannel).Loc(3,:),2), ...
  'Parent', hAxes, ...
  'LineWidth', 2, ...
  'LineStyle', 'none', ...
@@ -477,7 +478,8 @@ function DrawArrows()
  Channels = ChannelMat.Channel(iChannels);
  % Get channels locations
  if length(Channels) > 10
- markersLocs = cell2mat(cellfun(@(c)c(:,1), {Channels.Loc}, 'UniformOutput', 0))';
+ % Center of mass of all coordinates for each sensor
+ markersLocs = cell2mat(cellfun(@(c) mean(c,2), {Channels.Loc}, 'UniformOutput', 0))';
  end
  % Ask to select reference
  isOk = SelectReference();