更改 geom_text 的默认“a"图例标记字符串本身 [英] Change geom_text's default "a" legend to label string itself

问题描述

类似于

解决方案

您可以更改图例键生成功能.这仍然需要一些人工干预，但可以说比使用 grob 要少.

库(ggplot2)图书馆(网格)数据(虹膜)iris$abbrev = substr( iris$Species, 1, 2 )oldK <- GeomText$draw_key # 保存以备后用# 定义新键# 如果您手动添加颜色，则添加颜色向量# 而不是`scales::hue_pal()(length(var))`GeomText$draw_key <- 函数(数据、参数、大小、var=unique(iris$abbrev),cols=scales::hue_pal()(length(var))) {# sort as ggplot 按字母数字/或因子水平对这些进行排序txt <- if(is.factor(var)) levels(var) else sort(var)txt <- txt[match(data$colour, cols)]textGrob(txt, 0.5, 0.5,只是=中心"，gp = gpar(col = alpha(data$colour, data$alpha),fontfamily = data$family,fontface = data$fontface,字体大小 = 数据$大小 * .pt))}ggplot(data=iris, aes(x=Sepal.Length, y=Sepal.Width,形状=物种，颜色=物种)) +geom_text(aes(label = abbrev))# 重置密钥GeomText$draw_key <- oldK

Similarly to this question, I want to change the default "a" in the legend, but rather than removing it completely, I want to replace it with the labels themselves. That is, the first line of the legend should have a colored icon labeled "se" with the full name "setosa" on the right.

iris$abbrev = substr( iris$Species, 1, 2 )
     
ggplot(data = iris, aes(x = Sepal.Length, y = Sepal.Width, 
                        shape = Species, colour = Species)) +
    geom_text(aes(label = abbrev))

解决方案

You can change the legend key generating function. This still requires a bit of manual intervention, but arguably less than using the grobs.

library(ggplot2)
library(grid)

data(iris)
iris$abbrev = substr( iris$Species, 1, 2 )

oldK <- GeomText$draw_key # to save for later

# define new key
# if you manually add colours then add vector of colours 
# instead of `scales::hue_pal()(length(var))`
GeomText$draw_key <- function (data, params, size, 
                               var=unique(iris$abbrev), 
                               cols=scales::hue_pal()(length(var))) {

    # sort as ggplot sorts these alphanumerically / or levels of factor
    txt <- if(is.factor(var)) levels(var) else sort(var)
    txt <- txt[match(data$colour, cols)]

    textGrob(txt, 0.5, 0.5,  
             just="center", 
             gp = gpar(col = alpha(data$colour, data$alpha), 
                       fontfamily = data$family, 
                       fontface = data$fontface, 
                       fontsize = data$size * .pt))
}

ggplot(data=iris, aes(x=Sepal.Length, y=Sepal.Width, 
                      shape=Species, colour=Species)) +  
  geom_text(aes(label = abbrev))


# reset key
GeomText$draw_key <- oldK

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