rcrvn(3G)							     rcrvn(3G)

NAME    [Toc]    [Back]

     rcrvn - draws a series of curve segments

C SPECIFICATION    [Toc]    [Back]

     void rcrvn(n, geom)
     long n;
     Coord geom[][4];

PARAMETERS    [Toc]    [Back]

     n	    expects the	number of control points to be used in drawing the
	    curve.

     geom   expects the	matrix containing the control points of	the curve
	    segments.

DESCRIPTION    [Toc]    [Back]

     rcrvn draws a series of rational cubic spline curve segments using	the
     current basis and precision.  The control points specified	in geom
     determine the shapes of the curve segments	and are	used four at a time.
     For example, if n is 6, three curve segments are drawn, the first using
     points 0,1,2,3 as control points, and the second and third	segments are
     controlled	by points 1,2,3,4 and 2,3,4,5, respectively.  If the current
     basis is a	B-spline, Cardinal spline, or basis with similar properties,
     the curve segments	are joined end to end and appear as a single curve.

     Each curve	segment	is approximated	by a sequence of straight lines.  All
     lines use the current linestyle, which is reset prior to the first	line
     and continues through subsequent lines.  Other line modes,	including
     depthcueing, line width, and line antialiasing, also apply	to the lines
     generated by rcrvn.

     After rcrvn executes, the graphics	position is undefined.

SEE ALSO    [Toc]    [Back]

     crv, crvn,	curvebasis, curveprecision, defbasis, depthcue,	linesmooth,
     linewidth,	rcrv, setlinestyle


									PPPPaaaaggggeeee 1111