Here one of of different possibilities.
The whole logic is located in t_P
Thanks, it worked.
Another example https://www.geogebra.org/m/QCcHyusx
another method
the user can control the movement
Thank you very much, it worked.
Comments have been locked on this page!
The same question 
Here one of of different possibilities.
The whole logic is located in t_P
Another example https://www.geogebra.org/m/QCcHyusx
another method
the user can control the movement
Thank you very much, it worked.
Comments have been locked on this page!