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

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

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