如何使用ggplot更改箱形图的轮廓颜色？ [英] How do I change the outline colours of a boxplot with ggplot?

问题描述

我的数据具有相同的值，因此它们像箱形图中的一条线一样出现。但是，这意味着我无法说出组之间的区别，因为填充不会显示出来。如何将箱形图的轮廓更改为特定颜色。

My data has values which are all the same so they are coming up as just a line in a box plot. This, however, means that I can't tell the difference between groups as the fill doesn't show up. How can I change the outlines of the boxplot to be a specific colour.

注意：我不希望所有轮廓线颜色都相同，如下一行代码所示：

Note: I do not want all the outline colours to be the same colour, as in the next line of code:

library(dplyr)
library(ggplot2)

diamonds %>% 
      filter(clarity %in% c("I1","SI2")) %>% 
    ggplot(aes(x= color, y= price, fill = clarity))+
      geom_boxplot(colour = "blue")+
      scale_fill_manual(name= "Clarity", values = c("grey40", "lightskyblue"))+
      facet_wrap(~cut)

相反，我希望I1的所有图（用灰色40填充）都用黑色绘制轮廓，而SI2的图（用浅天蓝色填充）用蓝色绘制轮廓。

Instead, I would like all the plots for I1 (filled with grey40) to be outlined in black while the plots for SI2 (filled with lightskyblue) to be outlined in blue.

以下内容似乎无效

geom_boxplot(colour = c("black","blue"))+

OR

scale_color_identity(c("black", "blue"))+

OR

scale_color_manual(values = c("black", "blue"))+

推荐答案

您必须：

1. 为美学添加颜色=清晰度


2. 将 scale_color_manual 添加到具有所需颜色的ggplot对象中


3. 名称 scale_color_manual 相同 scale_fill_manual 的方式来获取单个组合图例

1. Add color = clarity to aesthetics
2. Add scale_color_manual to ggplot object with wanted colors
3. Name scale_color_manual the same way as scale_fill_manual to get single combined legend

代码：

library(dplyr)
library(ggplot2)
diamonds %>% 
    filter(clarity %in% c("I1","SI2")) %>% 
    ggplot(aes(x= color, y= price, fill = clarity, color = clarity))+
        geom_boxplot()+
        scale_fill_manual(name= "Clarity", values = c("grey40", "lightskyblue"))+
        scale_color_manual(name = "Clarity", values = c("black", "blue"))+
        facet_wrap( ~ cut)

图：

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