## spline.api
# Compiled by:
# src/lib/x-kit/draw/xkit-draw.sublib### "Before I had chance in another war,
### the desire to kill people to whom I had
### not been introduced had passed away."
###
### -- Autobiography of Mark Twain
# This api is implemented in:
#
# src/lib/x-kit/draw/spline.pkg#
api Spline {
#
package g: Xgeometry; # Xgeometry is from src/lib/std/2d/xgeometry.api curve: (g::Point, g::Point, g::Point, g::Point) -> List(g::Point);
#
# Given four points (p0, p1, p2, p3), return a list of points corresponding to
# to a Bezier cubic section, starting at p0, ending at p3, with p1, p2 as
# control points.
simple_bspline: List(g::Point) -> List(g::Point);
#
# Compute a simple B-spline with the given control points.
b_spline: List(g::Point) -> List(g::Point);
#
# bSpline ([p1]@l@[pn]) === simpleBSpline ([p1, p1, p1]@l@[pn, pn, pn])
# The replication of p1 and pn constrains the resultant spline
# to connect p1 and pn.
closed_bspline: List(g::Point) -> List(g::Point);
#
# Compute a closed B-spline.
# closedBSpline (l as a . b . c . _) = simpleBSpline (l@[a, b, c])
# Note that the first and last points of the result are the same.
};
## COPYRIGHT (c) 1991 by AT&T Bell Laboratories See SMLNJ-COPYRIGHT file for details.
## Subsequent changes by Jeff Prothero Copyright (c) 2010-2013,
## released per terms of SMLNJ-COPYRIGHT.