如何在ggplot2中创建等效的基本R图'type = b'? [英] How to create base R plot 'type = b' equivalent in ggplot2?

问题描述

基于plot()的功能允许设置type='b'并获得线与点的组合图，其中点从线段偏移了

Base plot() functionality allows one to set type='b' and get a combined line and point plot in which the points are offset from the line segments

plot(pressure, type = 'b', pch = 19)

我可以轻松地用线和点创建ggplot，如下所示.

I can easily create a ggplot with lines and points as follows.

ggplot(pressure, aes(temperature, pressure)) + 
  geom_line() + 
  geom_point()

但是，直线一直延伸到要点.我可以设想一种可以使用其他几何体(例如geom_segment()?)将类似type='b'功能的东西混在一起的方法，但是我想知道是否有更直接的方法可以通过geom_line()和geom_point()来完成此任务.

The lines, however, run right up to the points. I can envision a way that I might hack together something like type='b' functionality using other geoms (e.g. geom_segment()?), but I am wondering if there is a more direct way to accomplish this with geom_line() and geom_point().

推荐答案

一种稍微有点怪异的方法是在较大的白点上绘制较小的黑点:

A slightly hacky way of doing this is to overplot a small black point on a larger white point:

ggplot(pressure, aes(temperature, pressure)) + 
  geom_line() +
  geom_point(size=5, colour="white") + 
  geom_point(size=2) + 
  theme_classic() +
  theme(panel.background = element_rect(colour = "black"))

此外，按照 ggplot中的控制点边界粗细，在ggplot2的2.0.0版本中，可以使用geom_point的stroke参数控制边框的粗细，因此可以仅用(例如)geom_point(size=2, shape=21, fill="black", colour="white", stroke=3)替换这两个geom_point，而无需覆盖这些点.

In addition, following Control point border thickness in ggplot, in version 2.0.0 of ggplot2 it's possible to use the stroke argument of geom_point to control the border thickness, so the two geom_points can be replaced by just (e.g.) geom_point(size=2, shape=21, fill="black", colour="white", stroke=3), eliminating the need to overlay the points.

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