[R] Putting colours in ggplot facets

[Paul Murrell]

Hi

Another alternative (using 'gggrid' to add a 'grid' rect grob as the 
background), just for the record ...

library(gggrid)

bgrect <- function(data, coords) {
     rectGrob(gp=gpar(col=NA, fill=adjustcolor(data$fill[1], alpha=.3)))
}

ggplot(df, aes(x=date, y=vari)) +
     grid_panel(bgrect, aes(fill=geo)) +
     scale_fill_manual(values=colr) +
     geom_bar(stat="identity")+
     facet_grid(est ~ geo)

Paul

On 26/10/2021 3:40 pm, phil using philipsmith.ca wrote:
> Thanks for the suggestions. As it happens, I just a moment ago found a
> solution. By adding the lines: ct$date <- 1 and ct$vari <- 1 everything
> works as I want it to.
> 
> Philip
> 
> On 2021-10-25 22:37, Ben Tupper wrote:
>  > Hi,
>  >
>  > I don't quite follow what you want to achieve - colored backgrounds
>  > for each panel? You could RSeek.org for some ideas on how to fish the
>  > panels grobs out... https://rseek.org/?q=ggplot+facet+backgound+color 
> <https://rseek.org/?q=ggplot+facet+backgound+color>
>  >
>  > https://rseek.org/?q=ggplot+facet+backgound+color 
> <https://rseek.org/?q=ggplot+facet+backgound+color>
>  >
>  >
>  > I can get sort of close by skipping the use of table ct and instead
>  > filling the panels using your df table. But it doesn't color each
>  > panel instead it colors each geo group.
>  >
>  > ggplot(df,aes(x=date,y=vari))+
>  > geom_rect(aes(fill=geo),
>  > xmin=-Inf,xmax=Inf,
>  > ymin=-Inf,ymax=Inf,alpha = 0.3)+
>  > scale_fill_manual(values=colr)+
>  > geom_bar(stat="identity")+
>  > facet_grid(est~geo)
>  >
>  >
>  > You could add another column, composed of geo and est, and fill by
>  > that...
>  >
>  > df <- dplyr::tibble(date,vari,geo,est) %>%
>  > dplyr::mutate(colr = paste(geo, est))
>  >
>  > ggplot(df,aes(x=date,y=vari))+
>  > theme(panel.background = element_rect(fill = colr)) +
>  > scale_fill_manual(values=colr)+
>  > geom_bar(stat="identity")+
>  > facet_grid(est~geo)
>  >
>  > But it makes for a long set of labels on the scale bar thingy.
>  >
>  > I hope that helps.
>  >
>  > Ben
>  >
>  >
>  > On Mon, Oct 25, 2021 at 9:08 PM <phil using philipsmith.ca> wrote:
>  >>
>  >> I am using ggplot2 and I want to use different colours for some
>  >> facets.
>  >> Here is a reprex:
>  >>
>  >> library(tidyverse)
>  >> date <- as.numeric(c(2017,2017,2017,2017,2017,2017,2018,2018,
>  >> 2018,2018,2018,2018,2019,2019,2019,2019,2019,2019))
>  >> vari <- as.numeric(c(4.8,3.3,4.2,5.2,4.8,5.7,5.4,3.1,5.7,4.1,
>  >> 3.1,1.5,4.5,4.4,2.8,2.0,2.1,2.2))
>  >> geo <- as.factor(c("Canada","Canada","Nova Scotia",
>  >> "Nova Scotia","Manitoba","Manitoba","Canada",
>  >> "Canada","Nova Scotia","Nova Scotia","Manitoba",
>  >> "Manitoba","Canada","Canada","Nova Scotia",
>  >> "Nova Scotia","Manitoba","Manitoba"))
>  >> est <- as.factor(c("Wages and salaries",
>  >> "Gross mixed income","Wages and salaries",
>  >> "Gross mixed income","Wages and salaries",
>  >> "Gross mixed income","Wages and salaries",
>  >> "Gross mixed income","Wages and salaries",
>  >> "Gross mixed income","Wages and salaries",
>  >> "Gross mixed income","Wages and salaries",
>  >> "Gross mixed income","Wages and salaries",
>  >> "Gross mixed income","Wages and salaries",
>  >> "Gross mixed income"))
>  >> df <- data.frame(date,vari,geo,est)
>  >> ct <- unique(df[,c('est','geo')])
>  >> colr=c("blue","forestgreen","red","lightblue",
>  >> "brown","gold")
>  >> p0 <- ggplot(df,aes(x=date,y=vari))+
>  >> geom_rect(data=ct,aes(fill=geo),
>  >> xmin=-Inf,xmax=Inf,
>  >> ymin=-Inf,ymax=Inf,alpha = 0.3)+
>  >> scale_fill_manual(values=colr)+
>  >> geom_bar(stat="identity")+
>  >> facet_grid(est~geo)
>  >> p0
>  >>
>  >> I have tried several approaches and Googled for help, but to no avail.
>  >> I
>  >> am getting the error message: Error: Aesthetics must be either length
>  >> 1
>  >> or the same as the data (6): x and y
>  >>
>  >> Thanks for some help.
>  >>
>  >> Philip
>  >>
>  >> ______________________________________________
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> 
> ______________________________________________
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> PLEASE do read the posting guide 
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> <http://www.R-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.

-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul using stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/