combining legends with scale_fill_grey + scale_shape_manual

[Ben Bolker]

When I draw the following example graph, I am hoping for a
single legend with the point shapes and grey scales changing
in common (i.e. a black circle for c=0.1, a dark grey square
for c=0.2, a medium grey diamond for c=0.3, and so forth).
Instead I get two legends -- one full of black circles (should be
changing shades of grey?) and one with unfilled shapes.
Does anyone have insights/workarounds? (I tried explicitly
naming the scales, that didn't seem to make a difference.)

d <- data.frame(x=1:5,y=1:5,c=factor(seq(0.1,0.5,by=0.1)))
library(ggplot2)
ggplot(d,aes(x=x,y=y,shape=c,fill=c))+
geom_point(size=5)+
scale_fill_grey(start=0.1,end=0.9)+
scale_shape_manual(values=21:25)

cheers
Ben Bolker

[hadley wickham]

Hi Ben,

Looks like a bug. I'll look into it.

Hadley

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[hadley wickham]

> Looks like a bug.  I'll look into it.

Yes, it was a bug that prevented any scale created with scale_manual
from correctly merging with legends produced by other scales. It's
fixed in the development version, which I'm hoping to release very
soon.

Regards,

Hadley

[elaliberte]

Strange. Using ggplot2 version 0.8.3 under R 2.10.1, Ben's code worked
perfectly and generated only one legend, which looks fine (i.e. it
combines both fill and shape). Why then, would it work on my setup but
not on his?

[Ben Bolker]

I was using v. 0.8.5 under 2.10.1, maybe it was a newly introduced bug ...

cheers
Ben

--
Ben Bolker
Associate professor, Biology Dep't, Univ. of Florida
bol...@ufl.edu / people.biology.ufl.edu/bolker
GPG key: people.biology.ufl.edu/bolker/benbolker-publickey.asc

[hadley wickham]

The fact that it ever worked was a bug disguising the fact that
legends were being combined inappropriately.

Hadley