imellipse doesn't work on GUI axes

Dear all,

I have a GUI with an axes where I display an image. By pressing a pushbutton, I would like to apply the imellipse function on this image, but it fails and I don't have any idea why (in my opinion it doesn't make any sense):

% --- Executes on button press in hand_pushbutton.
function pushbutton_Callback(hObject, eventdata, handles)
% hObject    handle to hand_pushbutton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
I = imread('coins.png');
handles.axes, imshow(I);
h = imellipse(handles.axes);

The error messege I get is:

    ??? Error using ==> hittest
  Invalid object handle

Error in ==> ipthittest at 33
h = hittest(hFigure, currentPoint);

Error in ==> findLowestManagedObject at 16
    hit_test_obj = imshared.ipthittest(hFigure,currentPoint);

Error in ==> iptPointerManager>createPointerManager/updatePointer at 280
        overMe = findLowestManagedObject(hFigure,currentPoint);

Error in ==> iptPointerManager>createPointerManager/enablePointerManager at 218
        updatePointer(figHandle, lastCurrentPoint);

Error in ==> iptPointerManager at 72
    pointerManager.API.enable();

Error in ==> ellipseSymbol>setupCursorManagement at 301
        iptPointerManager(h_fig);

Error in ==> ellipseSymbol>initialize at 121
      setupCursorManagement();

Error in ==> imrect>imrectAPI at 220
draw_api.initialize(h_group)

Error in ==> imrect>imrect.imrect at 83
            [h_group,draw_api] = imrectAPI(varargin{:});

Error in ==> imellipse>imellipse.imellipse at 89
            obj = obj@imrect(varargin{:},'DrawAPI',ellipseSymbol());

Error in ==> newGUI>pushbutton_Callback at 997
h = imellipse(handles.axes);

Error in ==> gui_mainfcn at 96
        feval(varargin{:});

Error in ==> newGUI at 42
    gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)newGUI('pushbutton_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

Can you please give me a hint why this error occurs? Thank you in advance!

Answer 1

[Erwin]

Nobody has an idea? I would really appreciate a hint because it seems an absolutely weird MATLAB problem to me. Thank you

[Alex Taylor]

Erwin, I just sent you an email. If you can distill this into a simple example, I'd be happy to take a look and get back to you.

Answer 2

[Walter Roberson]

The line

handles.axes, imshow(I);

is going to output the numeric handle number for handles.axes, and is then going to imshow() against whatever the current axes happens to be at the time.

Use

imshow(I, 'Parent', handles.axes);

Answer 3

[Image Analyst]

Did it actually print a number to the command window when it hit this line: handles.axes ??? Are you sure that is the name of the axes? If you hover the cursor over handles (when it's stopped there because of a breakpoint) does it list axes as one of the members of the "handles" structure?

Answer 4

[Erwin]

Thank you for your answers and your help!

@ Image Analyst: Yes, handles.axes is the name of my axes and it prints out a number to the command window.

Meanwhile, I just copied all elements from my GUI and created a new GUI which is indentical to my old one. It runs without any problem!!! I don't have any idea why that problem occured in my privious GUI, to me it seems to be magic...