使用 ggplot2 的 plot_usmap 时，如何将比例设置为静态窃取动态

Question

I am trying to have my legend's scale be consistent across nine different plots. Currently the scale changes for each plot. Here is the code for the first two plots:

plot_usmap(data = january, values="tot_cases", color="black") +
  scale_fill_gradient2(low = "blue", high = "red", name = "Total Cases", label = scales::comma,) +
  theme(legend.position = "right",panel.background = element_rect(color = "black", fill = "lightblue"))

plot_usmap(data = february, values="tot_cases", color="black") +
  scale_fill_gradient2(low = "blue", high = "red", name = "Total Cases", label = scales::comma) +
  theme(legend.position = "right",panel.background = element_rect(color = "black", fill = "lightblue"))

How can I get the scales to be the same for all my plots?

Answer 1

Like @stefan said, add the limits parameter which takes 2 numbers, min and max. plot_usmap(data = january, values="tot_cases", color="black") + scale_fill_gradient2(low = "blue", high = "red", name = "Total Cases", label = scales::comma, limits = c(MIN, MAX)) + theme(legend.position = "right",panel.background = element_rect(color = "black", fill = "lightblue"))