GUI slider only translates point in one direction

Hello,

So I created a code that makes 2 sliders translate a point on an axis in the x and y direction. But either way I pull the sliders, they go ONLY in the positive direction. Can anyone help me corredct this?

Code:

function x_pos_Callback(hObject, eventdata, handles)
% hObject    handle to x_pos (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
global pnt 
global Npnt 
cla 
x = get(hObject,'Value');
pnt(:,1) = pnt(:,1)+x;
pnt(Npnt+1:end,:) =[];
patch(pnt(:,1),pnt(:,2),'r')

% --- Executes during object creation, after setting all properties.
function x_pos_CreateFcn(hObject, eventdata, handles)
% hObject    handle to x_pos (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end 

Thankyou to anyone who reads this!

Answer 1

[Miguel Sanz]

I am also in your class. What you want to do is go to the actual GUI (guide) and go to the slider's propert inspector. Once there, there are min and max limits; simply put the min at -1.

[Stephen Purk]

Thanks! It really does help! Hope you get a good grade, I hear that just handing it in gives you a 50 by default.