复制和修改默认主题 [英] Copying and modifying a default theme

问题描述

我想为 ggplot 创建一个基于 theme_bw（）的新主题。

我猜想以下步骤是必需的（伪代码）：

1. 复制theme_bw（）： theme_new（）< - theme_bw（）


2. 修改副本： theme_update .title.x = theme_text（family = base_family，size = base_size，vjust = 0.5））

任何关于如何实施的建议都将非常感谢！

---

编辑： @Andrie ，我修改了您的答案以满足我的需求：

  theme_new<  -  theme_set（theme_bw（））
 theme_new< -  theme_update（axis.title.x = theme_text（family = base_family，size = base_size，vjust = 0.5））
  

然而，我得到以下错误：

  ggplot（mtcars，aes（factor（cyl）））+ geom_bar（ ）
  

错误in match（gparname，names（gpars））：object'base_size'not found

---

编辑： 31/10/2017，@Andrie提供的答案工作得很好。
R版本3.4.1，ggplot2_2.2.1

解决方案

wiki 建议了一种使用 modifyList 的方法，

  theme_new < -  function（base_size = 12，base_family =，...）{
 modifyList（ theme_bw（base_size = base_size，base_family = base_family），
 list（axis.title.x = theme_text（family = base_family，
 size = base_size，vjust = 0.5）））
} 
  

I would like to create a new theme for ggplot that is based on theme_bw().

I imagine the following steps are necessary (in pseudocode):

1. Make a copy of theme_bw(): theme_new() <- theme_bw()
2. Modify the copy: theme_update(axis.title.x = theme_text(family = base_family, size = base_size, vjust = 0.5))

Any advice on how to implement this will be very much appreciated!

---

Edit: @Andrie, I modified your answer for my needs:

theme_new <- theme_set(theme_bw())
theme_new <- theme_update(axis.title.x = theme_text(family = base_family, size = base_size, vjust = 0.5))

However, I get the following error:

ggplot(mtcars, aes(factor(cyl))) + geom_bar()

Error in match(gparname, names(gpars)) : object 'base_size' not found

---

Edit: 31/10/2017, answer provided by @Andrie works just fine. R version 3.4.1, ggplot2_2.2.1

解决方案

the wiki suggests one way to do this using modifyList,

theme_new <- function (base_size = 12, base_family = "", ...){
 modifyList (theme_bw (base_size = base_size, base_family = base_family),
          list (axis.title.x = theme_text(family = base_family, 
                size = base_size, vjust = 0.5)))
}

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