MATLAB: Checking a GUI Checkbox ‘Value’

gui

If I have a few Gui checkbox statements, how do I check the values of them to see if they changed from my original default setting ?? Here is what I used for my first checkbox statement:

h.checkbox1 = uicontrol(current_f,'Style','checkbox', 'Value',1)

Best Answer

Then:

value = get(h.checkbox1, 'Value');

If you want to store the initial value of the checkbox, you could use either the handles struct or the UserData of the uicontrol.

Related Solutions

MATLAB: How to reset toggle buttons with a push button

push buttton callback:

set(handles.togglebutton1,'value',0);
set(handles.togglebutton2,'value',0);

MATLAB: How to uncheck checkbox

Hello amira, you could add another condition to your callback, like this:

fucntion checkbox1_callback(hObject,eventdata,handles)
if hObject.Value==1 % This is like your isChecked==1
    if isfield(handles,'imgData')
    I=handles.imgData;
    J=imnoise(I,'salt & pepper',0.3);
    imshow(J);
    title('Noise type: Salt and pepper');
elseif hObject.Value==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    imshow(I)
    title('No noise')
end
guidata(hObject,handles)
end

Note that I have changed isChecked to hObject.Value because isChecked is a variable that does not exist when you call the callback, and hObject.Value or handles.checkbox1.Value (which are equivalent if you are inside the callback function of checkbox1) they give you value 1 if it's checked and 0 if it's not checked.

Now if you want to apply different types of noise then you need to create for example a second checkbox, and let's suppose it's tag is checkbox2, then you could do like this:

fucntion checkbox2_callback(hObject,eventdata,handles)
if hObject.Value==1
    if isfield(handles,'imgData')
    I=handles.imgData;
    J=imnoise(I,'my_noise',0.3);
    imshow(J);
    title('Noise type: mynoise');
elseif hObject.Value==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    imshow(I)
    title('No noise')
end
guidata(hObject,handles)
end

Now the problem is that if you want to apply only one noise at a time and not allow 2 noises to be together you could do like this:

fucntion checkbox1_callback(hObject,eventdata,handles)
if hObject.Value==1 && handles.checkbox2.Value==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    J=imnoise(I,'salt & pepper',0.3);
    imshow(J);
    title('Noise type: Salt and pepper');
elseif hObject.Value==0 && handles.checkbox2==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    imshow(I)
    title('No noise')
end
guidata(hObject,handles)
end
fucntion checkbox2_callback(hObject,eventdata,handles)
if hObject.Value==1 && handles.checkbox1.Value==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    J=imnoise(I,'my_noise',0.3);
    imshow(J);
    title('Noise type: mynoise');
elseif hObject.Value==0 && handles.checkbox1.Value==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    imshow(I)
    title('No noise')
end
guidata(hObject,handles)
end

Like this you can only apply one noise at a time and also the checkboxes won't apply noise to an image that has allready a noise applied to it. If you want to add warning dialogs to warn the user that he is applying 2 noises then you could simply write them like this:

fucntion checkbox1_callback(hObject,eventdata,handles)
if hObject.Value==1 && handles.checkbox2.Value==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    J=imnoise(I,'salt & pepper',0.3);
    imshow(J);
    title('Noise type: Salt and pepper');
elseif hObject.Value==0 && handles.checkbox2==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    imshow(I)
    title('No noise')
elseif hObject.Value==1 && handles.checkbox2==1
    warndlg('Only one noise may be applied', 'Invalid choice warning');
end
guidata(hObject,handles)
end
fucntion checkbox2_callback(hObject,eventdata,handles)
if hObject.Value==1 && handles.checkbox1.Value==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    J=imnoise(I,'my_noise',0.3);
    imshow(J);
    title('Noise type: mynoise');
elseif hObject.Value==0 && handles.checkbox1.Value==0
    if isfield(handles,'imgData')
    I=handles.imgData;
    imshow(I)
    title('No noise')
elseif hObject.Value==1 && handles.checkbox1==1
    warndlg('Only one noise may be applied', 'Invalid choice warning');
end
guidata(hObject,handles)
end

Hope this answer helped you get what you were looking for.

Best Answer

Related Solutions

MATLAB: How to reset toggle buttons with a push button

MATLAB: How to uncheck checkbox

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