设置geom和scale ggplot2的默认值 [英] Setting Defaults for geoms and scales ggplot2

问题描述

对ggplot2进行主题化可以很容易地降低对多个或重复的 + opt（）... 行的需求。但是，我想知道是否有方法来定义geoms和scale颜色的默认值。我不想为每个绘图编写 ... + scale_fill_manual（），我希望能够设置并忘记它。同样，我希望能够设置geom选项，所以我不必重新输入（或忘记重新输入）诸如 geom_text（...，size = 3，color =white ）

更新：

对于比例尺来说，是一种方法：

set_default_scale（color，discrete，gray）

但是这个函数似乎并不存在于ggplot2的最新版本中。

解决方案

现在还有另一种方法。例如：

  scale_colour_discrete<  -  function（...）scale_colour_brewer（...）您可以基本覆盖任何美学比例。 ，... palette =Set2）
 scale_fill_discrete<  -  function（...）scale_fill_brewer（...，palette =Set2）
  

现在，您的美学将会根据该行为进行着色或填充。'

按照 https://groups.google.com/forum/?fromgroups=#!topic/ggplot2/w0Tl0T_U9dI

关于geoms的默认值，您可以使用 update_geom_defaults ，例如：

  update_geom_defaults（line，list（size = 2））
  

Theming for ggplot2 makes it quite easy to relegate the need for multiple or repetitive + opt()... lines. However, I would like to know if there is a way to define defaults for geoms and scale colors. Instead of having to write ...+ scale_fill_manual() for each plot, I'd like to be able to set it and forget it. Similarly, I'd like to be able to set geom options so I don't have to retype (or forget to retype) things like geom_text(...,size=3,color="white")

Update:

For scales, it seems at some point that there was a method:

set_default_scale("colour", "discrete", "grey")

But this function doesn't seem to exist in the most recent version of ggplot2.

解决方案

There is another method for this now. You can essentially overwrite any aesthetics scale, for example:

scale_colour_discrete <- function(...) scale_colour_brewer(..., palette="Set2")
scale_fill_discrete <- function(...) scale_fill_brewer(... , palette="Set2")

Now, your aesthetics will be coloured or filled following that behaviour.'

As per: https://groups.google.com/forum/?fromgroups=#!topic/ggplot2/w0Tl0T_U9dI

With respect to defaults to geoms, you can use update_geom_defaults, for example:

update_geom_defaults("line",   list(size = 2))

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