Real time movements during drawing

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Marco Antonio Grivet Mattoso Maia 2022-7-18

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https://ww2.mathworks.cn/matlabcentral/answers/1763145-real-time-movements-during-drawing

回答： Shubham 2023-12-29

I wrote an App using Matlab2021a that graphically illustrates real time linear combination of vectors by means of sliders working as the linear combination factors. It worked fine. When I upgrade my Matlab to 2022a, the real time effect was gone. The drawing appears only when I stop moving de sliders. Does anyone know what possibly is going wrong?

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Jonas 2022-7-19

can you show us the code? how did you implement the "real time" callback? normally i would create a listener using addlistener() with the 'PreSet' option

Marco Antonio Grivet Mattoso Maia 2022-7-19

I simply use the callbacks "ValueChangingFcn" to get the "real-time" visualization. That works well under Matlab2021a but not under Matlab2022a.

You can find the full code at https://drive.google.com/drive/folders/19gLw0XuL3iA-qQB01K2gVXYxiDXw-0Ok?usp=sharing

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Answer 1

Shubham 2023-12-29

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在 MATLAB Online 中打开

Hey Marco,

I understand that you wrote an App in MATLAB r2021a using “uislider”. You used “ValueChangingFcn” callback to get the real-time visualization of your app. The effect was no longer present after updating MATLAB to r2022a. I tried to open the link present in the comments, but the code file is not accessible.

Please check if the “uislider” has only the “ValueChangingFcn” as the callback. You can search for the callbacks you have added. Refer to the following:

https://www.mathworks.com/help/releases/R2022a/matlab/creating_guis/write-callbacks-for-gui-in-app-designer.html#:~:text=Designer%20Programmatically.-,Search%20for%20Callbacks%20in%20Your%20Code,-If%20your%20app

There is an example present in the documentation using “ValueChangingFcn” callback for the release r2022a which works fine. I have tested the example at my end. You can have a look at the documentation for the same here:

https://www.mathworks.com/help/releases/R2022a/matlab/ref/uislider.html#:~:text=%25%20Create%20ValueChangingFcn%20callback

You can test out the example to check the callback using the following command:

openExample('matlab/SimpleAppWithCallbackExample')

To get a better idea, please share the code files used for the app.

Hope this helps!