SF对象的尺寸图例不会显示正确的符号 [英] Size legend of sf object won't show correct symbols

问题描述

有人知道为什么size静态BIR74的图例不显示点大小而是矩形吗?如果答案是肯定的，我该如何解决?

Does anyone know why the legend of the size aestatic BIR74 won't show the dot sizes but rectangles? If the answer is yes, how can I fix this?

可复制的示例:

library(sf)
# devtools::install_github("tidyverse/ggplot2")
library(ggplot2)

nc <- st_read(system.file("shape/nc.shp", package="sf"))

nc_centers <- st_centroid(nc)

nc_centers %>%
  ggplot() +
  geom_sf(aes(color = SID79, size = BIR74)) +
  coord_sf(datum = NA) +
  theme_minimal()

推荐答案

您需要将show.legend参数添加到geom_sf中，即

you need to add the show.legend argument to geom_sf, i.e.

nc_centers %>%
  ggplot() +
  geom_sf(aes(color = SID79, size = BIR74), show.legend = 'point') +
  coord_sf(datum = NA) +
  theme_minimal()

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