[R] ggplot bar geom: control the filling in the colour legend

[Benoit Boulinguiez]

Hi all,

Is it possible to change the filling of the squares used to represent 
the colour legend in a bar plot with ggplot?

in this example, fillings are raven black, I'd like them white.

ggplot(diamonds, aes(clarity, colour = cut)) + geom_bar()

Regards

-- 
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Benoit Boulinguiez
Ph.D student
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