How to handle imroi in gui?

 Hello guys, I've been trying to make image processing gui tool.

In the gui there's image display window and functioning button's.

By the way, I planted a button that functioning imline, imrect and imfreehand in the gui.

So far I had no problem. But after I've made several line or rectangle, I needed to erase some of them.

At this very point, I have no Idea about how to handle these figure I've already made.

I just want to certain selected one to be erased by 'delete' button.

How can I break through this problem? :(

REF : http://desperate-engineers.com/blog/2011/05/06/matlab-multiple-roimask-editor-class/

Answer 1

[David Sanchez]

You can use the following function to undo the last n plotting operations:

function undo_plot(h, n)
% UNDO_PLOT Undo last 'n' plotting operations.
if nargin == 1 
  n = 1;
end
if n < 1
  error('Can''t undo < 1 plotting operation!');
end
figure(h);
children = get(gca, 'children');
for i = 1 : n
  delete(children(i));
end

[David Sanchez]

example of use:

plot([1,1],[2,3]) % plot vertical line hold on plot([0,2],[2,5]) % plot another line undo_plot(1,1) % delete last line and plot returns to its first layout

[Seombeom Kim]

Thank you for your opinion. But I'm afraid, my intention is not to erase lastly created IMROI. I want erase arbitrary one out of several IMROIs. Anyway, I appreciate your kind proposal. Thanks.