ggplot2对象的动态位置（特别是geom_text）？ [英] Dynamic position for ggplot2 objects (especially geom_text)?

问题描述

使用ArcGIS制作地图时，默认情况下软件会自动推送点和多边形标签，以避免使用专有算法进行重叠。他们将此称为

图摘自此博客文章。

When using ArcGIS to make maps, the software by default pushes point and polygon labels around automatically to avoid overlap using a proprietary algorithm. They refer to this as dynamic labeling. ggplot2 has position_jitter which is excellent for points (since dynamic labeling might create systematic bias), but less good for labels using geom_text.

Here's an example of some problems with jitter that a dynamic labeling algorithm might solve:

library(ggplot2)
ggplot( mtcars,aes( x=wt, y=mpg, label=rownames(mtcars) ) ) +
  geom_point() +
  geom_text( position=position_jitter(h=1,w=1) )

Does such a dynamic labeling feature exist already in ggplot2?

If not, what algorithms exist for doing so and is it possible to implement a position_dynamic in R?

解决方案

Check out the new package ggrepel. ggrepel provides geoms for ggplot2 to repel overlapping text labels. It works both for geom_text and geom_label.

Figure is taken from this blog post.

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