Create and save imfreehand() positions until the user clicks a button to finish

Hi,

I want an image to open and the user to draw ROI with imfreehand() until they are finished — with the co-ordinates saved into structured array — — the following code does it for 3 regions of interest — — but how can i do this until the user is finished? Would be good to have an undo button too — which not only deletes the region of interest but also deletes xy co-ordinates in the array.

Thanks!!

img = imread('myfig.jpg')
imshow(img)
i = 1;
for i = 1:3
hFH(i) = imfreehand();
xy{i} = hFH(i).getPosition;
end

NOTE:-

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You could use

img = imread('myfig.jpg')
imshow(img)
i = 1;
finished = 'NO';
i = 1;
while strcmpi(finished,'NO')
hFH(i) = imfreehand();
finished = questdlg('Finished?', ...
'confirmation', ...
'YES', 'NO', 'UNDO', 'NO');
if strcmpi(finished, 'UNDO')
delete(hFH(i))
finished = 'NO';
else
xy{i} = hFH(i).getPosition;
i = i + 1;
end
end

SEE COMPLETE ANSWER CLICK THE LINK

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