CODEWITHSUNDEEP
rggplot2
spore234
spore234

Reputation: 3650

two legends when plot is built from two data frames

I have two data frames likes this:

library(ggplot2)

set.seed(1)
x1 = rnorm(100)
y1 = rnorm(100)

x2 = rnorm(100)
y2 = rnorm(100)

df1  = data.frame(x=x1, y=y1, col1 = rep(1:4, each = 25))
df2 = data.frame(x=x2, y=y2, col2 = rep(5:8, each = 25))

I plot this data:

ggplot() +
  geom_point(aes(x = x1, y = y1,  colour = as.factor(col1)), data = df1, size = 1, shape = 19) +
  geom_point(aes(x = x2, y = y2,  colour = as.factor(col2)), data = df2, size = 2, shape = "\u2605")

The results is this:

enter image description here

How can I get two separate legends for each data frame? The legends should also correctly reflect the shapes used and let me specify legend titles for each legend.

I know that this solution exists but it's rather old and requires symbols that can take fills, I want to use custom unicode symbols.

Upvotes: 2

Views: 106

Answers (1)

stefan
stefan

Reputation: 125897

This can be achieved via the ggnewscale package which allows to have additional scales and legends for the same aestethic. Try this:

library(ggplot2)

set.seed(1)
x1 = rnorm(100)
y1 = rnorm(100)

x2 = rnorm(100)
y2 = rnorm(100)

df1  = data.frame(x=x1, y=y1, col1 = rep(1:4, each = 25))
df2 = data.frame(x=x2, y=y2, col2 = rep(5:8, each = 25))

ggplot() +
  geom_point(aes(x = x1, y = y1,  colour = as.factor(col1)), data = df1, size = 1, shape = 19) +
  ggnewscale::new_scale_color() +
  geom_point(aes(x = x2, y = y2,  colour = as.factor(col2)), data = df2, size = 2, shape = "\u2605")

Upvotes: 2

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