crvn(3G)

NAME
     crvn - draws a series of curve segments

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

PARAMETERS
     geom   expects a matrix of 3-D points.

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

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