Changes

On each circle c (``c=1,...,nbcircles``), we will define some objects ``o`` (``o=1,...,nbObjects[c]) (called sometimes particles here), so the total number of objects is <context>\setuplayout[scale=0.8]$``O = \sum_{c=nbObjects[1}^{nbcircles} ] + nbObjects[2]+...+nbObjects[cnbcircles]$</context>``. Each object $``o$ `` on circle $``c$ `` will have at time $`t$ ` the position `Position[c][o][t]`. This position, express as a number in $[0,1]$ is a coordinate along the path `ThePath[c]`. The position at time 1 is chosen randomly along the path $c$ (line 13), and then will be calculated for each time $`t$ ` from the position at time $`t-1$ ` (line 18). Each object will have its own \type{deplacement}, which depends on the length of the circle modified by random factor (line 14). Lastly, to distinguish easily particles in the following figures, we will assign a random color to each one (line 16): `TheColor[c][o]`