Moving dependent point in involute
I would like to make an interactive version of the involute of y=x^3 in GeoGebra.
This is the locus of P in the following GeoGebra app:
One would like to move the point P with the mouse along the locus of the involute, and see how the point B changes. Because physically P is the "end of a piece of string" which we are pulling taut. However, in GeoGebra, P depends on B, so it cannot be moved. Is there any way to do this?