datacursormode callback / inserting cursors

Hello all

I have a GUI which includes several tabs and several axis.

On one axis, I'm plotting several curves like this (note that this procedure is saved in an extra script file and is called from the main file)

axes(handles.axis_zoom);

satellite = 'glo';

prnarray = handles.prnarray;

for k=1:length(prnarray)

temp_data = handles.data.(strcat(satellite, num2str(prnarray(k))));

L(k) = plot(handles.meas_time, temp_data, '-b', 'linewidth', 1);

end

Then, credits to https://de.mathworks.com/matlabcentral/answers/1308-cursor-line, I will add multiple cursors like this

hold on;

for ii = 1:length(prnarray)

S.D{ii} = get(L(ii),{'xdata','ydata'});

S.L(ii) = length(S.D{ii}{1});

S.M(ii) = floor(S.L(ii)/2);

S.DF = diff(S.D{ii}{1}(S.M(ii):S.M(ii)+1)); % uniform assum

S.I(ii) = S.M(ii);

S.T(ii) = text(S.D{ii}{1}(S.M(ii)+2),S.D{ii}{2}(S.M(ii)+2),'here');

set(S.T(ii),'string',{['Y: ',sprintf('%3.3g',S.D{ii}{2}(S.M(ii)))]})

S.F(ii) = plot(S.D{ii}{1}(S.M(ii)),S.D{ii}{2}(S.M(ii)),'sk');

set(S.F(ii),'markerfacec','b')

end

This will plot me the y values of each plot in the middle of the x axis.

Now i want to move along the x axis so I can inspect the datapoints.

I tried a callback on the axis

function axis_zoom_ButtonDownFcn(hObject, eventdata, handles)

S.D{ii} = get(handles.axis_zoom,{'xdata','ydata'});

But this simply never triggers, I dont know why, also I am not sure if this syntax will read the x and y data from all the plots ( would be nice to know how to get the data from a certain plot by the way), but as i said it doesnt trigger.

I am pretty new to Matlab and don't know how to integrate an updatefunction, also most examples I could google were in one simple script, if possible, where do I set it (main script or the sub script which plottes the data).

I guess i could handle to get the x coordinate from the datacursor, but main problem at this moment is the triggering, is there a datacursor trigger event i can use?

Thanks