tclspline is a port of the [spline] routines from the [Tk] [canvas] [widget],
made callable on coordinate lists and made into a [TEA]-compliant Tcl C
extension.

'''SYNOPSIS'''

spline nSteps pointList

spline_raw nSteps pointList

'''DESCRIPTION'''

Input is an integer number of steps, nSteps, and a list containing
three or more pairs of x and y coordinates. spline reads that list and
generates a new list of x and y coordinate pairs representing a curve
based on the passed points, rendered as a set of quadratic splines:
one spline is drawn for the first and second line segments, one for
the second and third, and so on.

Straight-line segments can be generated within a curve by duplicating
the end-points of the desired line segment.

spline_raw indicates that the list should also be returned as a curve,
but the list of coordinates is such that the first coordinate pair
(and every third coordinate pair thereafter) is a knot point on a
cubic Bezier curve, and the other coordinates are control points on
the cubic Bezier curve.

Straight line segments can be generated within a curve by making
control points equal to their neighboring knot points. If the last
point is a control point and not a knot point, the point is repeated
(one or two times) so that it also becomes a knot point.

nSteps specifies the degree of smoothness desired for curves; each
spline will be approximated with nSteps line segments.

'''OBTAINING TCLSPLINE'''

Format: source code, a gzip of a tar archive.

Download: http://flightaware-tcltools.googlecode.com/files/tclspline-1.0.tar.gz

Project: http://code.google.com/p/flightaware-tcltools/


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