[R] continuous coloring of a polygon

[Dieter Menne]

Roger Leenders <r.t.a.j.leenders <at> rug.nl> writes:

> 
> I have a polygon inside a circle as follows:
> 
.. Example code removed (but it's nice you included it)
> (the graph much resembles a speed dial inside a car).
> Now I want to fill the polygon with color, such that it starts on the 
> left with red and ends on the right with green, following the coloring 
> of the rainbow.

What comes closest is function gradient.rect in package plotrix. You could use
it as an starting example, and replace the rect() in it by polygon computed in
polar coordinates.

Dieter