R语言中绘图 设置图例
001、基础绘图
p <- ggplot(mtcars,aes(mpg,hp,colour=factor(cyl)))+geom_point()
p ## 基础绘图
002、删除图例标题
p + theme(legend.title = element_blank()) ## 删除图例标题
003、删除图例
p + theme(legend.position = "none")
004、设置图例位置
p + theme(legend.position = "top")
005、设置图例方向
p + guides(color = guide_legend(direction = "horizontal")) ## 设置为水平方向
006、设置图例标题外观
p + theme(legend.title = element_text(color = "chocolate", size = 14, face = "bold"))
007、设置图例标题的名称
p + labs(color = "11111\n222222\n3333:") + theme(legend.title = element_text(color = "chocolate", size = 14, face = "bold"))
008、设置图例标题名称
p + scale_color_discrete(name = "xxx\nyyy\nzzz") + theme(legend.title = element_text(color = "chocolate", size = 14, face = "bold"))
009、修改图例顺序
library(ggplot2) ggplot(mtcars,aes(mpg,hp,colour=factor(cyl)))+geom_point() ## 默认顺序
mtcars$cyl <- factor(mtcars$cyl, levels = c("8", "4", "6")) ## 修改图例顺序 ggplot(mtcars,aes(mpg,hp,colour=factor(cyl)))+geom_point()
010、自定义图例名称
p + scale_color_discrete(name = "Seasons:", labels = c("xxxxx", "yyyyyy", "zzzzzz"))
011、设置图例填充色
p + theme(legend.key = element_rect(fill = "cyan"))
012、设置图例符号的大小
p + guides(color = guide_legend(override.aes = list(size = 20)))
。