public StateInteractive process_logfile_point(PlaPointFloat p_point){
  circle_radius=circle_center.distance(p_point);
  return this;
}

public StateInteractive process_logfile_point ( PlaPointFloat p_point ) { circle_radius = circle_center . distance ( p_point ) ; return this ; }
used when reading the next point from a logfile . calls complete , because only 1 additional point is stored in the logfile .
