|  |  |  | Locus | 
 
Create a locus defined by two points. The user selects two points, one is a free point on a line and the other one is a constrained point of the first one (i.e. when one moves, the other one does as well).
 ) or join
  the DR. GEOmailing list.
) or join
  the DR. GEOmailing list.|  |  |  | Locus |