MATLAB: How to control GUI data from anther GUI

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By using GUIDE toolbox I have made two GUI in matlab. I want to control a image in an axes of GUI1 by using a slider GUI2. How is it possible? How can I pass the value of slider in GUI2 to axes of GUI2? Thanks

Best Answer

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

If the object from the other GUI has a unique Tag then you can findobj() based on the Tag . Or in case the object has only callback visibility then findall() instead of findobj(). GUIDE allows you to change the Tag of an object.

If the object does not have a unique Tag then you need a way of finding some graphics object that belongs to the other GUI -- such as if the first GUI passed its figure number to the second GUI when it started the second GUI. If you can find some graphics object from the other GUI then you can ancestor() to find its figure. Then you can call guidata() passing in that figure identifier, which will return back the handles structure that belongs to that GUI; you can then extract the appropriate handle from that handles structure.

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Assign a unique tag to GUI2. This can be done by opening GUI2 in GUIDE, right click on the GUI background, select 'property inspector', and then assign a unique string in the "Tag" property.
From GUI1, find the handle to GUI2 using: h = findobj(0, 'tag', 'UNIQUE_TAG'); where "UNIQUE_TAG" is the tag you assigned.
Now get the handle to all of GUI2 components by using: handlesGUI2 = guidata(h);
Now you have access to GUI2 from GUI1.

% Summary of above
% This goes in GUI1
h = findobj(0, 'tag', 'UNIQUE_TAG');
handlesGUI2 = guidata(h);

You should also write a conditional that throws an error when 'h' is empty (meaning that GUI2 could not be found) or if numel(h)>1 (meaning your tag was not unique enough or you have >1 instances of GUI2 open).

Best Answer

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