[App Designer]how to make endless loop program.

I want to create an app that continuously receives input and displays new images.

If I simply put a function that creates an image like below,

while(flag)
    function make_image()
end

the program seems to freeze. How should I design it?

[Voss]

Make sure there's a drawnow() being called somewhere within the loop.

while(flag)
    make_image();
    drawnow();
end

[Geoff Hayes]

@Jae-Hee Park - why is a while loop needed? When the new data is received, draw the image then. The problem with the while loop is that your code will become "stuck" within it and no other action (GUI button press, callback, etc.) will be called unless you make the loop interruptible by introducing a pause or the drawnow like @Benjamin suggests.

[Jae-Hee Park]

@Geoff Hayes I want to make app which makes time varying star image. My plan is that app looks like the obserber is moving.

Thus I think Input some boresight sequence then app make images.

[Geoff Hayes]

@Jae-Hee Park - consider using a timer to periodically update your image. The timer could have a period of one second (or less) and within its callback, you would make the update (similar to the body of your while loop).

[Jae-Hee Park]

@Geoff Hayes Thank you!

Answer 1

[Jae-Hee Park]

Geoff Hayes 2021년 12월 21일 13:12

@Jae-Hee Park - why is a while loop needed? When the new data is received, draw the image then. The problem with the while loop is that your code will become "stuck" within it and no other action (GUI button press, callback, etc.) will be called unless you make the loop interruptible by introducing a pause or the drawnow like @Benjamin suggests.