DATE     94/01/10

    Opérateur CERCLE                           See also :CER3 
    ----------------

    GEO1 = CERC (N1)  POIN1 CENTR1 POIN2  ('DINI' DENS1) ('DFIN' DENS2)

    (C is also possible)

    Description :
    _____________

    The CERC operator enables the user to construct the arc of 
 a circle of centre CENTR1 between the points POIN1 and POIN2.

    Contents :
    __________

    POIN1 | : extreme points of the arc of the circle (POINT type)
    POIN2 |

    CENTR1  : circle centre (POINT type)

    N1      : number of generated elements (ENTIER type)

    DENS1 | : densities associated with the points POIN1 and POIN2
    DENS2 |   (FLOTTANT type)

    GEO1    : arc of the circle (MAILLAGE type)


    Note 1 :
    __________

      If N1 is not specified, the number of generated  elements as 
 well as their size will be computed in relation to the extreme point
 densities.
    If N1 is specified and positive, N1 elements of equal length
 will be generated.
    If N1 is negative, N1 elements will be generated and their  
 size will be computed according to the extreme point densities. 


     Note 2 :
     __________

      If the densities associated with the POIN1 and POIN2 points are 
 inaccurate, they may be increased. The accurate value of the first
 point will be mentioned after the 'DINI' key word, that of the 
 second point will be mentioned after the 'DFIN' key word.

     Note 3 :
     __________

     If a LIG1 line is given instead of the POIN1 point (or POIN2), 
 this line will be extended as far as the POIN2 point (the line begins
 at the POIN1 point).
    If the POIN2 point is not given, the first extreme point of the
 LIG1 line will be taken into account, which permits to close this
 line.