Re: How to get rid of default grey background color in a lineplot legend

[Johannes Björk]

Hi,

for me, this worked...

#removing background

p + theme(
+ panel.background = element_rect(fill = "transparent",colour =
NA), # or theme_blank()
+ panel.grid.minor = element_blank(),
+ panel.grid.major = element_blank(),
+ plot.background = element_rect(fill = "transparent",colour =
NA)) + xlim=c(1,12)

Cheers
Jo

On 11 oct, 16:07, Jannemann <janheusch...@gmail.com> wrote:
> Hello together,
> I was looking all over the place but I can't figure out how to get rid of
> the default grey background color in a lineplot legend. I tried to set the
> plot and the panel background to blank but with no success. Can this be
> done in ggplot2?
> Thanks in advance for your help.
>
> Here is a small reproducable example:
>
> #This generates a small dataset
> h = 240
> R = seq(0.1,0.5,by=0.1)
> d = seq(0.0,2.0, by=0.1)
> Rd = rep(R, length(d))
> dd = rep(d, each = length(R))
> FSea = Rd * 2 * 0.03
> Er = FSea*dd / (1 + FSea*h*dd)
>
> dset = data.frame(cbind(Er,dd,Rd))
>
> #Some theme elements
> graph1 = theme(aspect.ratio = 1, panel.background = element_blank(),
> axis.line = element_line(), panel.grid.minor =
> element_blank(),panel.grid.major = element_blank(), plot.background =
> element_blank())
>
> p = ggplot(data = dset, aes(x = dd, y = (Er*3600)))
> p + geom_line(aes(linetype = factor(Rd), group = factor(Rd))) +
> scale_x_continuous("Density") + scale_y_continuous("Encounters") +
> guides(linetype = guide_legend("Reaction")) +
> theme(legend.position=c(0.85,0.35), panel.background = element_blank()) +
> graph1

[Jannemann]

Hi Jo, 

while this deletes the background for me, the grey in the legend is still there:

p + geom_line(aes(linetype = factor(Rd), group = factor(Rd)))  + theme(panel.background = element_rect(fill = "transparent",colour = NA), plot.background = element_rect(fill = "transparent",colour = NA), panel.grid.minor = element_blank(), panel.grid.major = element_blank(), plot.background = element_rect(fill = "transparent",colour = NA))

I am using version 0.9.2.1 on a mac.

Greetings, 

Jan

[Johannes Björk]

Hi,

Have you tried experiment with the  legend.background = theme_rect(fill="white") parameter? 

Maybe it's even possible to get it to transparent. 

Cheers

Jo

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[Brandon Hurr]

I think fill=NA would give you "transparent". It usually does for other attributes. 

[Jannemann]

Hi Jo and Brandon, 

thanks a lot for your help. After a reading more about updating theme options I found the element which had to be changed, and together with your hints I came to that solution:

+ theme(legend.key = element_rect(fill = NA, colour = NA, size = 0.25))

This removes the grey background and the black line around it. 

Greetings, 

Jan