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$$$$ PARA     NOTICE  CHAT      11/09/12    21:17:30     7124           
                                             DATE     11/09/12

    Operateur PARABOLE                       Voir aussi : CER3
    ------------------                                    CERC   
    LIG1 = PARA  (N1) ('DINI' DENS1) ('DFIN' DENS2) POIN1 POIN3 POIN2 ;


    Description :
    _____________

    The PARA operator constructs a parabola arc connecting two
 points so that the crossing of the tangents at these points be
 a specified point.

    Contents :
    __________

    N1      : number of generated elements (ENTIER type)

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

    POIN3   : point at the intersection of the tangents (POINT type)

    DENS1 | : densities associated with the extreme points of the  
    DENS2 |   parabola arc (FLOTTANT type)

    LIG1    : parabola arc (MAILLAGE type)

    Note :
    ________

    If N1 is not specified, the number of generated elements as
 well as their size will be calculated 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.

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

    If a LIG2 line is given instead of the POIN1 point (or POIN2)
 this line will be extended as far as the POIN2 point (its origin
 is the POIN1 point).

    If the POIN2 point is not given, the first extreme point of the
 LIG1 line is not taken into account, which permits to close this
 line.