英文:
How can I combine two ggplot2 custom functions makig the legend separate
问题
我有两个自定义函数：
plt_regression_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_smooth(method = "lm",se = FALSE,formula = "y ~ x",mapping = ggplot2::aes(alpha = "回归线"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}和plt_identity_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_abline(mapping = ggplot2::aes(slope = 1, intercept = 0, alpha = "一致性线"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}
它们单独使用时都能正常工作，但当我将它们组合在一起时，图例无法区分它们：
library(ggplot2)ggplot(mtcars,aes(qsec,mpg))+geom_point()+plt_regression_line(color = "red", linetype = 1)+plt_identity_line(color = "blue", linetype = 1)
*我使用了 alpha，因为 col 和 fill 可以用于其他变量，并且我希望在图例中显示它们。
英文:
I have two custom functions:
plt_regression_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_smooth(method = "lm",se = FALSE,formula = "y ~ x",mapping = ggplot2::aes(alpha = "Regression line"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}
and
plt_identity_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_abline(mapping = ggplot2::aes(slope = 1, intercept = 0,alpha = "Identity line"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}
They work perfect individually, but when I combine them the legend does not distinguish on from another:
library(ggplot2)ggplot(mtcars,aes(qsec,mpg))+geom_point()+plt_regression_line(color = "red",linetype = 1)+plt_identity_line(color = "blue",linetype = 1)
*I use alpha, since col and fill can be used for others variables and I want to show them in the legend.
答案1
得分: 1
你两次使用了'alpha'美学，所以ggplot正在合并图例。一个潜在的选项是为其中一个函数使用另一个美学，例如线宽（linewidth）：
library(tidyverse)plt_regression_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_smooth(method = "lm",se = FALSE,formula = "y ~ x",mapping = ggplot2::aes(alpha = "Regression line"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}plt_identity_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_abline(mapping = ggplot2::aes(slope = 1, intercept = 0, linewidth = "Identity line"),linetype = linetype,color = color),ggplot2::labs(linewidth = ""),ggplot2::scale_linewidth_manual(values = c(0.5,0.5)))}ggplot(mtcars,aes(qsec,mpg))+geom_point()+plt_regression_line(color = "red",linetype = 1) +plt_identity_line(color = "blue",linetype = 1)
另一个潜在的选项是使用 ggnewscale 包，例如：
library(tidyverse)library(ggnewscale)plt_regression_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_smooth(method = "lm",se = FALSE,formula = "y ~ x",mapping = ggplot2::aes(alpha = "Regression line"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}plt_identity_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_abline(mapping = ggplot2::aes(slope = 1, intercept = 0, alpha = "Identity line"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}ggplot(mtcars,aes(qsec,mpg))+geom_point()+plt_regression_line(color = "red",linetype = 1) +ggnewscale::new_scale(new_aes = "alpha") +plt_identity_line(color = "blue",linetype = 1)
这两种解决方案对你的用例有用吗？
英文:
You are using the 'alpha' aesthetic twice, so ggplot is combining the legends. One potential option is to use another aesthetic, e.g. linewidth, for one of the functions:
library(tidyverse)plt_regression_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_smooth(method = "lm",se = FALSE,formula = "y ~ x",mapping = ggplot2::aes(alpha = "Regression line"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}plt_identity_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_abline(mapping = ggplot2::aes(slope = 1, intercept = 0,linewidth = "Identity line"),linetype = linetype,color = color),ggplot2::labs(linewidth = ""),ggplot2::scale_linewidth_manual(values = c(0.5,0.5)))}ggplot(mtcars,aes(qsec,mpg))+geom_point()+plt_regression_line(color = "red",linetype = 1) +plt_identity_line(color = "blue",linetype = 1)
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<sup>Created on 2023-06-19 with reprex v2.0.2</sup>
Another potential option is to use the ggnewscale package, e.g.
library(tidyverse)library(ggnewscale)plt_regression_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_smooth(method = "lm",se = FALSE,formula = "y ~ x",mapping = ggplot2::aes(alpha = "Regression line"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}plt_identity_line <- function(color = "black", linetype = "dashed"){list(ggplot2::geom_abline(mapping = ggplot2::aes(slope = 1, intercept = 0,alpha = "Identity line"),linetype = linetype,color = color),ggplot2::labs(alpha = ""),ggplot2::scale_alpha_manual(values = c(1,1)))}ggplot(mtcars,aes(qsec,mpg))+geom_point()+plt_regression_line(color = "red",linetype = 1) +ggnewscale::new_scale(new_aes = "alpha") +plt_identity_line(color = "blue",linetype = 1)
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<sup>Created on 2023-06-19 with reprex v2.0.2</sup>
Do either of these solutions work for your use-case?
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