How to terminate drawline() with a buttonPushedCallback?

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I would like to repeat the drawline command for selecting multiple ROIs in a figure axes, and I hope to stop the while-loop after I press a stop button in the mlapp GUI. For this purpose, I used a stopButtonPushed callback to change the app.stopstate. But the problem is that, the drawline command will have been excuted after I press the stop button, so I have to draw an extract ROI before it stops.
Is there any way to solve this problem, like killing the running process? Thank you for your help!
(1) The multple ROIs I selected by repeating drawline()
(2) Part of my code related to this question
app.stopstate = 0;
while true
if app.stopstate == 1
app.stopstate = 0;
app.en = app.en + 1;
app.element{app.en} = drawline(app.UIAxes,'Color',color,'Deletable',true);
function stopButtonPushed(app, event)
app.stopstate = 1;

Accepted Answer

Aghamarsh Varanasi
Aghamarsh Varanasi on 15 Jun 2021
You can use the keyboard shortcut 'Esc' key to cancel the drawing of a line while using the 'drawline' function. In your case, you can click on the GUI button to break from the while loop and click 'Esc' to cancel the extra line that you need to draw. However, cancelling the 'drawline' function returns an ROI object with empty 'Position' field, which can be filtered out easily.
For more information refer to the 'Tips' section of the documentation page of drawline.

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