/**
  * Make a Connector using 2 markers
  *
  * @param m1 connector begins at this Marker
  * @param m2 connector ends at this Marker
  * @param colorValue connector's color
  */
 public Connector(Marker m1, Marker m2, Color colorValue) {
   pointA = m1.getPoint();
   pointB = m2.getPoint();
   color = colorValue;
 }