diagrams-lib-1.3.0.8: Embedded domain-specific language for declarative graphics

Copyright | (c) 2011 diagrams-lib team (see LICENSE)
License | BSD-style (see LICENSE)
Maintainer | diagrams-discuss@googlegroups.com
Safe Haskell | None
Language | Haskell2010

Diagrams.CubicSpline

Contents

- Constructing paths from cubic splines

Description

A cubic spline is a smooth, connected sequence of cubic curves passing through a given sequence of points. This module provides the `cubicSpline` method, which can be used to create closed or open cubic splines from a list of points. For access to the internals of the spline generation algorithm (including in particular a solver for cyclic tridiagonal systems of linear equations), see Diagrams.CubicSpline.Internal.

Synopsis

- cubicSpline :: (V t ~ v, N t ~ n, TrailLike t, Fractional (v n)) => Bool -> [Point v n] -> t

# Constructing paths from cubic splines

cubicSpline :: (V t ~ v, N t ~ n, TrailLike t, Fractional (v n)) => Bool -> [Point v n] -> t Source

Construct a spline path-like thing of cubic segments from a list of vertices, with the first vertex as the starting point. The first argument specifies whether the path should be closed.

    pts = map p2 [(0,0), (2,3), (5,-2), (-4,1), (0,3)]
    spot = circle 0.2 # fc blue # lw none
    mkPath closed = position (zip pts (repeat spot))
                 <> cubicSpline closed pts
    cubicSplineEx = (mkPath False ||| strutX 2 ||| mkPath True)
                  # centerXY # pad 1.1

For more information, see http://mathworld.wolfram.com/CubicSpline.html.