drawcircle function in while loop does NOT store data

Hello everyone,

I need to select multiple ROIs from a figure so I am using the function drawcircle. Since I need multiple rois, I added a while loop and halt it with a STOP button. However, the drawcircle function works outside the loop, but it does not store the info when within it.

That's the code I am using:

figure;

imagesc(your_figure_here)

H = uicontrol('Style', 'PushButton', ...

'String', 'Break', ...

'Callback', 'delete(gcbf)');

n=0;

while (ishandle(H))

n=n+1;

roi()= drawcircle()

end

Answer 1

[Ernesto Salcedo]

How about something like this

figure;
imshow(img)
crater_mask = false(size(img));
H = uicontrol('Style', 'PushButton', ...
    'String', 'STOP', ...
    'Callback', 'delete(gcbf)');
while ishandle(H)
    roi = drawcircle;
    
    if ishandle(roi)
    wait(roi); % wait for double click
    crater_mask = roi.createMask | crater_mask;
    end
end

imshowpair(img,crater_mask)

[Xingwang Yong]

Thank you, this works.

By the way, I found another solution recomended by MATLAB, Use Wait Function After Drawing ROI