crvn(3G)							      crvn(3G)

NAME    [Toc]    [Back]

     crvn - draws a series of curve segments

C SPECIFICATION    [Toc]    [Back]

     void crvn(n, geom)
     long n;
     Coord geom[][3];

PARAMETERS    [Toc]    [Back]

     geom   expects a matrix of	3-D points.

     n	    expects the	number of points in the	matrix referenced by geom.

DESCRIPTION    [Toc]    [Back]

     crvn draws	a series of cubic spline segments using	the current basis and
     precision.	 The control points determine the shapes of the	curve segments
     and are used sequentially four at a time.

     For example, if there are six control points, there are three possible
     sequential	selections of four control points.  Thus, crvn draws three
     curve segments: the first using control points 0,1,2,3; the second	using
     control points 1,2,3,4; and the third using control points	2,3,4,5.

     If	the current basis is a B-spline, a Cardinal spline, or a 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 crvn.

     After crvn	executes, the graphics position	is undefined.

SEE ALSO    [Toc]    [Back]

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


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