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curveb(3G)							    curveb(3G)

NAME
     curveb - selects a basis matrix used to draw curves

FORTRAN 77 SPECIFICATION
     subroutine curveb(basid)
     integer*4 basid

PARAMETERS
     basid   expects the basis identifier of the basis matrix you want to use
	     when drawing a curve. (You must have previously called defbas to
	     assign a basis identifier to a basis matrix.)

DESCRIPTION
     curveb selects a basis matrix (by its basis identifier) as the current
     basis matrix to draw curve segments.  The basis matrix determines how the
     system uses the control points when drawing a curve.  Depending on the
     basis matrix, the system draws bezier curves, cardinal spline curves, b-
     spline curves and others. The system does not restrict you to a limited
     set of basis matrices. You can define basis matrices to match whatever
     constraints you want to place on the curve.

SEE ALSO
     crv, crvn, curvep, defbas

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