How can I use imellipse on a GUI?

I want to draw a circle using imellipse on an image in a gui and then using a button get the position of that circle. However when I try to run the code, it gives an error saying there are not enough input arguments, eventhough the syntax is imellipse(hparent).

function SAMPLE(hObject,eventdata, handles)
 
vid = VideoReader('filename.avi');
frames = read(vid);
conv = rgb2gray(frames);
fig = uifigure;
[yax, xax] = size(conv);
ax = uiaxes('Parent',fig,'XLim',[0,xax],'YLim',[0,yax]);
imagesc(ax, conv)
btn = uibutton(fig,'push','Text','Ready','Position',[420,218,100,22],'ButtonPushedFcn', @expCirc);
circ = imellipse(handles.axes);

    function expCirc(btn,event)
        pos = getPosition(circ);
        x = pos(1,1);
        y = pos(1,2);
        w = pos(1,3);
        h = pos(1,4);
        center = [x+(w/2),y+(h/2)];
        radius = w/2*1.5;
        ncirc = viscircles(center, radius);
    end
 
end

[Geoff Hayes]

Rossy - why are you using handles.axes instead of ax?

ax = uiaxes('Parent',fig,'XLim',[0,xax],'YLim',[0,yax]);
imagesc(ax, conv)
btn = uibutton(fig,'push','Text','Ready','Position',[420,218,100,22],'ButtonPushedFcn', @expCirc);
circ = imellipse(ax);

[Rossy Drucker Shaooli]

I tried doing that but it also gave me an error:

Error using event.proplistener

While adding a PostSet listener, property 'XDir' in class 'matlab.ui.control.UIAxes' is not

defined to be SetObservable.

[Geoff Hayes]

And is handles.axes a valid axes object in your GUI? Where does it get set?

[Rossy Drucker Shaooli]

What do you mean get set? I though it was included in the handles from the hObject?

[Geoff Hayes]

Are you using GUIDE? Did you create the axes already (in the GUI editor)? What is the value for handles.axes?

[Rossy Drucker Shaooli]

I solved it, my problem was that I was triying to use a GUI but I didn't really need it. Thanks for your help anyways!

Answer 1

[Dennis]

When asking a question you should always include the complete error message.

My guess is that your error message tells you that you do not have enough input arguments, because your SAMPLE function is not a callback.

Beyond that i think you might run into a few problems using the uifigure/uiaxes instead of figure/axes.

function SAMPLE
 
vid = VideoReader('filename.avi');
frames = read(vid);
conv = rgb2gray(frames);
fig = figure;
[yax, xax] = size(conv);
ax = axes('Parent',fig,'XLim',[0,xax],'YLim',[0,yax]);
imagesc(ax, conv)
btn = uicontrol('style','pushbutton','string','Ready','Position',[420,218,100,22],'callback', @expCirc);
circ = imellipse(ax);
    function expCirc(btn,event)
        pos = getPosition(circ);
        x = pos(1,1);
        y = pos(1,2);
        w = pos(1,3);
        h = pos(1,4);
        center = [x+(w/2),y+(h/2)];
        radius = w/2*1.5;
        ncirc = viscircles(center, radius);
    end
 
end

[Rossy Drucker Shaooli]

Thank you!! This worked perfectly!