CODEWITHSUNDEEP
rggplot2
Ningman
Ningman

Reputation: 89

Change the default colours used by geom_rect in ggplot2

I have used geom_rect to highlight 4 separate sections of my point plot graph, ggplot2 has used a default pink, green, blue and purple to shade in the rectangles, does anyone know of a way to change these default colours?

I didn't bother with a workable example but please let me know if you want one and I can post in comments

Upvotes: 2

Views: 3076

Answers (1)

Amar
Amar

Reputation: 1373

Using scale_fill_manual. An example:

library('ggplot2')  #v 0.9.0
library('scales')
(unemp <- qplot(date, unemploy, data=economics, geom="line", 
                 xlab = "", ylab = "No. unemployed (1000s)"))

presidential <- presidential[-(1:3), ]

yrng <- range(economics$unemploy)
xrng <- range(economics$date)
unemp + geom_vline(aes(xintercept = start), data = presidential)
unemp + geom_rect(aes(NULL, NULL, xmin = start, xmax = end, fill = party),
                   ymin = yrng[1], ymax = yrng[2],
                   data = presidential) + 
         scale_fill_manual(values = alpha(c("blue", "red"), 0.2))

More here: How can I have two different scale_fill_manual active in a ggplot command

Upvotes: 4

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