How to limit the movement of a rectangle?

I use RectangleMovingEvent.

But I want to move the rectangle only vertically.

So I changed the values of PreviousPosition and CurrentPosition, but they are the same.

How do I limit the movement of the rectangle ??

roi = drawrectangle('Position',p ,'Color',[1 0 0]);
addlistener(roi, 'MovingROI', @(a, b)roi_moved(a, b, handles));

function roi_moved(hObject, eventdata, handles)
p = hObject.Position;

Answer 1

[Stijn Haenen]

maybe this will work:

roi = drawrectangle('Position',p ,'Color',[1 0 0]);
t=0;
while t<1
    pause(0.15);pos=get(roi,'position');
    set(roi,'position',[p(1) pos(2) p(3) p(4)])
    t=t+0.01;
end

[BoSeon Kang]

I solved it like this.

hObject.Position(1) = eventdata.PreviousPosition(1);

Thank you for the answer.

Answer 2

[Stijn Haenen]

Maybe you can use the function:

get(roi,'position')

But i'm not sure what you want.

[BoSeon Kang]

I want to prevent the user from dragging the rectangle horizontally.