更改图例标题会中断ggplot2中的图例颜色 [英] Changing the legend title breaks the legend color in ggplot2
问题描述
我正在尝试更改ggplot上的图例标题.这是两个示例(部分来自此处);第一个是sf
包,这是我真正使用的包.第二个是没有那个似乎有相同问题的软件包.
I'm trying to change the legend title on my ggplot. Here are two examples (partly from here); the first one is with the sf
package, which is what I'm really using. The second one is without that package which seems to have the same problem.
有了sf
,我想要什么:
cities <- tibble::tribble(
~ lon, ~ lat, ~ name, ~ pop,
5.121420, 52.09074, "Utrecht", 311367,
6.566502, 53.21938, "Groningen", 189991,
4.895168, 52.37022, "Amsterdam", 779808
) %>% sf::st_as_sf(coords = c("lon", "lat"), crs = 4326)
lines_sfc <- sf::st_sfc(list(
sf::st_linestring(rbind(cities$geometry[[1]], cities$geometry[[2]])),
sf::st_linestring(rbind(cities$geometry[[2]], cities$geometry[[3]]))
))
lines <- sf::st_sf(
id = 1:2,
size = c(10,50),
geometry = lines_sfc,
crs = 4326
)
ggplot() +
geom_sf(aes(colour = pop, size=pop), data = cities)
给出一个带有错误标题的漂亮图例:
which gives a nice legend with bad title:
使用此,我修改了脚本以更改图例:
Using this, I modified my script to change the legend:
ggplot() +
geom_sf(aes(colour = pop), data = cities) +
guides(colour=guide_legend(title="New color"))
给出:
传说不再是渐变了,为什么?
The legend isn't a gradient anymore, why?
如果您没有sf
,则geom_bar
也会发生同样的情况:
If you don't have sf
, the same happens with a geom_bar
:
ggplot() +
geom_bar(aes(x=name, y=pop, colour = pop), stat="identity", data = cities)
给予:
与此同时:
ggplot() +
geom_bar(aes(x=name, y=pop, colour = pop), stat="identity", data = cities) +
guides(colour=guide_legend(title="New color"))
给予:
有没有办法只更改图例的标题而不是整个内容?
Is there a way to change only the title of the legend and not the whole thing?
我的sessionInfo:
my sessionInfo:
R version 3.4.3 (2017-11-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows Server >= 2012 x64 (build 9200)
Matrix products: default
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] sp_1.2-6 rgeos_0.3-26 ggplot2_2.2.1.9000 dplyr_0.7.4 sf_0.6-1
loaded via a namespace (and not attached):
[1] Rcpp_0.12.14 pillar_1.0.1 compiler_3.4.3 git2r_0.19.0 plyr_1.8.4
[6] bindr_0.1 viridis_0.4.0 class_7.3-14 tools_3.4.3 digest_0.6.13
[11] viridisLite_0.2.0 memoise_1.1.0 tibble_1.4.1 gtable_0.2.0 lattice_0.20-35
[16] pkgconfig_2.0.1 rlang_0.1.6.9002 cli_1.0.0 DBI_0.7 rstudioapi_0.6
[21] rgdal_1.2-16 curl_2.8.1 bindrcpp_0.2 gridExtra_2.3 e1071_1.6-8
[26] withr_2.1.1.9000 httr_1.3.1 knitr_1.18 devtools_1.13.3 classInt_0.1-24
[31] grid_3.4.3 glue_1.1.1 R6_2.2.2 udunits2_0.13 magrittr_1.5
[36] scales_0.5.0.9000 RStudioShortKeys_0.1.0 units_0.5-1 assertthat_0.2.0 colorspace_1.3-2
[41] labeling_0.3 utf8_1.1.3 lazyeval_0.2.1 munsell_0.4.3 crayon_1.3.4
推荐答案
ggplot() +
geom_sf(aes(colour = pop, size=pop), data = cities) +
scale_color_continuous(name = 'newname')
您可以调用色标并只指定名称
You can call the color scale and just specify the name
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