Graphics interrupts are not executed until the code calls figure() or pause() or drawnow() or uiwait() or waitfor()
You could have your code structured something like,
myfig = handle of your figure
user_quit = false;
for K = 1 : 324
for J = 1 : 3439324
drawnow();
if ~isgraphics(myfig);
%user closed the figure. React appropriately
user_quit = true;
break;
end
%now do a bite-sized amount of code, a couple of seconds or so
....
end
if user_quit; break; end
end
I used this structure as an example, to illustrate the point that "break" only breaks out of the innermost loop so you may need a check to break out of the outer loop
