Hi Barry,and Friends
in Grasshopper besides " Hoopsnake ", there is also
another Plug called "Anemone ", which also works maybe better,
and there is also the possibility of using " Kangaroo " a physics engine to move
rigid bodies, in various ways ,
but all these tools use a Button , True / False, and a connection Timer, to activate
or deactivate the action .......
and , the input data can all be adjusted by a Slider or direct links to the data in the Canvas-
I have not knowledge of Java Script, but I think it is not very easy
create a Collide / Repulsive tool
in any case, your attempts are very appreciable
do not give up......
alberto