colour of one geom 'leaking' into legend of another

[Olivia]

Hi there,

I have searched the group and forums, but apologies if this has been addressed previously.  My problem is that when I have a legend for geom_point size, colours elsewhere in the plot leak into the legend. However this is only visible intermittently (generally not when the plot is first drawn, but occurs both in R studio and R, and inescapably when I write the plot to a pdf or jpeg).  Please let me know if further information is required. An example of the problem is attached ("as in pdf version"), while "as in r studio" shows how it is first rendered.  The colour of the leak depends on the colour specified elsewhere in the plot.

#Some made up data:

repFrame <- data.frame(A= 1:20, B= rnorm(1:20), grades= rnorm(1:20),groupNum = rep(c("First group", "Second group"),each=10), class = rep(c("Class A", "Class B","Class C","Class D","Class E"),each=4))

testPlot <- ggplot(repFrame, aes(x=A, y = B))+
  geom_point(alpha=0.7, aes(size=groupNum,colour=grades))+
  geom_smooth(colour="orange")+
  geom_density2d(colour="pink",alpha=0.3)+
  theme_bw()
testPlot #ends up with pink lines across the back of the legend for size

testPlot2 <- ggplot(repFrame, aes(x=A, y = B))+
  geom_point(alpha=0.7, aes(size=groupNum,colour=grades))+
  geom_smooth(colour="orange")+
  geom_density2d(colour="forestgreen",alpha=0.3)+
  theme_bw()
testPlot2  #ends up with forestgreen lines across the legend for size.

# I thought the addition of the code below might fix the problem, but no.
theme_bw()+
  theme(legend.key=element_rect(fill="white"))+
  theme(legend.background=element_rect(fill="white"))

Kind regards,

Olivia
MSc candidate

[baptiste auguie]

Hi,

You can tell ggplot2 not to include a given layer in the guides,

geom_density2d(colour="pink", show_guide=FALSE)

which should fix your problem (but not the inconsistency of Rstudio's device, unfortunately...)

HTH,

b.

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[Olivia]

Excellent, thanks! I knew you could not show layers but since it was intermittent it hadn't occurred to me to try that as a solution. I have and it works on my real data, the graph looks much tidier now.

Kind regards,

Olivia