These functions create and draw Bezier Curves (a curve drawn relative to 4 control points).

1 2 3 4 5 |

`x` |
A numeric vector or unit object specifying x-locations of spline control points. |

`y` |
A numeric vector or unit object specifying y-locations of spline control points. |

`id` |
A numeric vector used to separate locations in |

`id.lengths` |
A numeric vector used to separate locations in |

`default.units` |
A string indicating the default units to use
if |

`arrow` |
A list describing arrow heads to place at either end
of the bezier, as produced by the |

`name` |
A character identifier. |

`gp` |
An object of class |

`vp` |
A Grid viewport object (or NULL). |

`...` |
Arguments to be passed to |

Both functions create a beziergrob (a graphical object describing a
Bezier curve), but only `grid.bezier`

draws the Bezier curve.

A Bezier curve is a line drawn relative to 4 control points.

Missing values are not allowed for `x`

and `y`

(i.e., it is not valid for a control point to be missing).

The curve is currently drawn using an approximation based on X-splines.

A grob object.

Grid,
`viewport`

,
`arrow`

.

`grid.xspline`

.

1 2 3 4 5 6 7 8 9 10 11 12 | ```
x <- c(0.2, 0.2, 0.4, 0.4)
y <- c(0.2, 0.4, 0.4, 0.2)
grid.newpage()
grid.bezier(x, y)
grid.bezier(c(x, x + .4), c(y + .4, y + .4),
id=rep(1:2, each=4))
grid.segments(.4, .6, .6, .6)
grid.bezier(x, y,
gp=gpar(lwd=3, fill="black"),
arrow=arrow(type="closed"),
vp=viewport(x=.9))
``` |

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