how to extract cursor data to a variable ?

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The matlab doc gives a way to manually Export Cursor Data to Workspace. Is there a function to do this automatically ? I would like to make computations on the cursor coordinates that the user drags in the plot (imshow).

Accepted Answer

Kojiro Saito
Kojiro Saito on 10 Jul 2018
datacursormode and getCursorInfo will be a solution.
x = linspace(0,10,150);
y = cos(5*x);
fig = figure;
plot(x,y,'Color',[0,0.7,0.9])
title('2-D Line Plot')
xlabel('x')
ylabel('cos(5x)')
% Enable data cursor mode
datacursormode on
dcm_obj = datacursormode(fig);
% Set update function
set(dcm_obj,'UpdateFcn',@myupdatefcn)
% Wait while the user to click
disp('Click line to display a data tip, then press "Return"')
pause
% Export cursor to workspace
info_struct = getCursorInfo(dcm_obj);
if isfield(info_struct, 'Position')
disp('Clicked positioin is')
disp(info_struct.Position)
end
function output_txt = myupdatefcn(~,event_obj)
% ~ Currently not used (empty)
% event_obj Object containing event data structure
% output_txt Data cursor text
pos = get(event_obj, 'Position');
output_txt = {['x: ' num2str(pos(1))], ['y: ' num2str(pos(2))]};
end
  6 Comments
Angie Vicente
Angie Vicente on 3 Jan 2021
help! how i can extract two datas with this code?
Rachid Belaroussi
Rachid Belaroussi on 4 Mar 2021
Edited: Rachid Belaroussi on 4 Mar 2021
tx kojiro, that help so much! I might add (tx to francesco): multiple data tips can be done by alt+left click to add a new point

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