[R] help with using grid.polygon()

[Ally]

Hi, 

I'm trying to use grid.polygon() to plot several polygons at once, with a
view to putting coloured polygons beneath a curve.  I'm struggling just to
get the grid.polygon to plot anything

# PLOT SOME POINTS
x 	<- 	1:100
y 	<- 	1:100*0.5 + 3
plot(x, y, pch = ".") 

# PLOT 2 POLYGONS
library(grid)
grid.polygon(x = c(20, 20, 40, 40, 40, 40, 60, 60), 
                 y = c(0, 10, 20 , 0, 0, 20, 30, 0), id = rep(1:2, each =
4), draw = T)

I'm wondering whether this is to do with the 'id' parameter, if I've
misunderstood it's use - but any hep would be greatly appreciated!

Thanks, Alastair
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