Change title and caption colors in ggplot2

Question

How do I change the field pop and continent. I want to put in Portuguese (Population and Continent). The data are in R through the package library(Gapminder).

I used the following command:

library(gapminder)
library(dplyr)
library(ggplot2)
gapminder_2007 <- filter(.data=gapminder,year==2007)
ggplot(data=gapminder_2007,aes(x=gdpPercap,y=lifeExp,color=continent,size=pop)) + 
   labs(title="PIB e Expectativa de Vida em 2007", subtitle="", 
   y="Expectativa de Vida",x="PIB Per capita", caption="") +
   geom_point() + 
   scale_x_log10()

Upshot:

Answer 1

Use the arguments color and size within the function labs:

ggplot(data=gapminder_2007,aes(x=gdpPercap,y=lifeExp,color=continent,size=pop)) + 
  labs(title="PIB e Expectativa de Vida em 2007", subtitle="", 
       y="Expectativa de Vida",x="PIB Per capita", caption="",
       color = "Continente",
       size = "População") +
  geom_point() + 
  scale_x_log10()

Or

ggplot(data=gapminder_2007,aes(x=gdpPercap,y=lifeExp,color=continent,size=pop)) + 
  labs(title="PIB e Expectativa de Vida em 2007", subtitle="", 
       y="Expectativa de Vida",x="PIB Per capita", caption="") +
  geom_point() + 
  scale_x_log10() + 
  guides(color=guide_legend(title="Continente")) + # Argumentos para os títulos das legendas
  guides(size=guide_legend(title="População"))

Edition: Choose country colors: To change country colors you can use any option of scale_color_****

• scale refers to the name of the function to make changes to colors; `
• colorrefere-se ao nome do argumento que você colocou noaes` that you want to change;
• ***** refers to the way you want to inform colors. You can pass the values of the form manual, brewer, and other forms (these are the main ones/which I use).

In the option manual, you must enter the names of the colors manually:

ggplot(data=gapminder_2007,aes(x=gdpPercap,y=lifeExp,color=continent,size=pop)) + 
  labs(title="PIB e Expectativa de Vida em 2007", subtitle="", 
       y="Expectativa de Vida",x="PIB Per capita", caption="",
       color = "Continente",
       size = "População") +
  geom_point() + 
  scale_x_log10() +
  scale_color_manual(values = c("green", "red", "yellow", "gray11", "blue")) #Informa aqui as cores!

Using the color palette Spectral of color brewer:

ggplot(data=gapminder_2007,aes(x=gdpPercap,y=lifeExp,color=continent,size=pop)) + 
  labs(title="PIB e Expectativa de Vida em 2007", subtitle="", 
       y="Expectativa de Vida",x="PIB Per capita", caption="",
       color = "Continente",
       size = "População") +
  geom_point() + 
  scale_x_log10() +
  scale_color_brewer(palette = "Spectral")