MATLAB: Data Cursor Position in GUI

Question

I am building a GUI in GUIDE.

The user selects an Image file, which is then displayed in a separate figure/window.

The datacursormode is activated for the figure, and the datatip text is customized.

I want to retrieve the data-cursor's position through the myupdatefcn. I am able to display the position info each time the user clicks somewhere on the image, but I can neither set or setappdata the position for use in another function.

...
  imshow(I);
  dcm_obj = datacursormode(f);
  datacursormode on;
  set(dcm_obj,'UpdateFcn', @myupdatefcn )
end
function txt = myupdatefcn(~, event_obj)
  pos = event_obj.Position;
  disp(['You clicked X:',num2str(pos(1)),', Y:',num2str(pos(2))]);
  txt = {'Point to Compute'};
end

How can I retrieve the data cursors' position for use in a separate function in my m file?

p.s. I've tried getCursorInfo(dcm_obj). I haven't been able to get it to work though, even by using a pause or waitforbuttonpress command.

p.p.s. I've read through http://www.mathworks.com/help/techdoc/ref/datacursormode.html. It hasn't helped me much.

Thanks in advance for any help.

Answer 1

Add this line to your myupdatefcn:

set(0,'userdata',pos);

Then from any workspace you can do:

pos = get(0,'userdata');