[R-sig-Geo] create a asymmetric ellipse

[gianni lavaredo]

Dear Researchers,

nobody know same fuction to draw an asymmetric ellipse as the fig starting
from a data.frame

cc <- data.frame(ID = 1, xx= 4256300, yy= 336235, N = 5.3, S= 2.1, W = 3.5,
E= 0.3)

or

cc <- data.frame(ID = 1, xx= 4256300, yy= 336235, y = 7.4, x=3.8)

where xx and yy are the coordiante of centre
thanks for help (i need)

Gianni
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