GUI PIANO SIN /SAWTOOTH/SQUARE

Hi, I'm just starting at coding with a GUI.

I have writen a code for a piano in Matlab and it's not working like I would.

My question is how to code my pop-up button in order to change my associated function (sin/sawtooth...) for each key.

here is what I've done so far

% --- Executes on button press in do1.
function do1_Callback(hObject, eventdata, handles)
note=261.63;
signal(note,a)

--------------------------------------

function y = signal(note,a)
Fe=44100;
t=0:1/Fe:1;
if a==1
    y=sin(2*pi*note*t);
elseif a==2
    y=square(2*pi*note*t);
elseif a==3
    y=sawtooth(2*pi*note*t);
end
sound(y,Fe);

----------------------------------------

function wave_Callback(hObject, eventdata, handles)
switch get(handles.signal,'value')
    case 1 
        %definie a = 1 
    case 2 
        %define a = 2
    case 3
        %define a = 3
end

Answer 1

[Walter Roberson]

Remove your wave_Callback code; you do not need to do anything there.

function do1_Callback(hObject, eventdata, handles)
note=261.63;
a = get(handles.wave, 'Value');
signal(note,a)

[W LA]

Well i'm not sure to understand how 'a' is taking the right value just by switching my function in my pop-up button but it appears to be working.

Thanks!

Answer 2

[Kevin Phung]

perhaps you can create a listbox on your main script and assign it a tag 'lb1' so that you can point to it elsewhere

lb = uicontrol('style','listbox','String',{'SIN','SAW','SQ'},...
    'Tag','lb1');

each time one of those keys are pressed, your keypress callback would retrieve the currently selected value from your list box.

lb =findobj(gcf,'Tag','lb1');
mode = lb.String{lb.Value} %this will return SIN, SAW, or SQ

switch mode
    case 'SIN'
        %blah blah
    case 'SAW'
        %blah
    case 'SQ'
        %blah
end

let me know if this helps.

a thought: I think creating 3 radiobuttons might more more aesthetically pleasing, just a tad bit more code

[W LA]

thank you for the time you have taken to respond, i did not try your idea but it may be working as well thanks !