Force the origin to start at 0 without margin between data and x axis in new ggplot theme

问题

Based on this question Force the origin to start at 0 I want to implement this into a new created theme and not just as a default setting.

data(iris)
ggplot(iris, aes(x = Species)) + 
  geom_bar() +
  scale_y_continuous(expand = expansion(mult = c(0, 0.05)))

How can I do this without defining it every single plot?

回答1:

As far as I know this not possible via theme(). But you can define a wrapper around scale_y_continuous like so

library(ggplot2)

data(iris)

scale_y_origin <- function(...) {
  scale_y_continuous(expand = expansion(mult = c(0, 0.05)), ...)
}

ggplot(iris, aes(x = Species)) + 
  geom_bar() +
  scale_y_origin()

来源：https://stackoverflow.com/questions/61969752/force-the-origin-to-start-at-0-without-margin-between-data-and-x-axis-in-new-ggp