MATLAB Creating Graphical User Interfaces

% hObject handle to slider1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider

% get(hObject,'Min') and get(hObject,'Max') to determine range of slider

maxval = get(hObject,'Max');

sval = get(hObject,'Value');

diffMax = maxval - sval;

data = get(hObject,'UserData');

data.val = sval;

data.diffMax = diffMax;

% Store data in UserData of slider

set(hObject,'UserData',data);

Notice that hObject is an input argument to the slider1_Callback function.

hObject is always the component that triggers the callback (the slider, in this case).

Thus, set(hObject,'UserData',data), stores the data variable in the

UserData property of the slider.

9 Add code to the push button callback for retrieving the data. Add these commands to
the end of the function, pushbutton1_Callback.

% Get UserData from the slider

data = get(handles.slider1,'UserData');

currentval = data.val;

diffval = data.diffMax;

display([currentval diffval]);

After you add the commands, pushbutton1_Callback looks like this.

% --- Executes on button press in pushbutton1.

function pushbutton1_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

% Get UserData from the slider

data = get(handles.slider1,'UserData');

currentval = data.val;

diffval = data.diffMax;

display([currentval diffval]);

Share Data Among Callbacks