R - 将ggplot网格线放在前景中 [英] R - put ggplot grid lines in foreground

问题描述

我想知道是否有办法让ggplot在绘制数据前画出网格线。据我所知，通过使用迄今为止运行良好的theme（），我可以轻松地格式化几乎所有东西。但是，我没有找到元素绘制顺序的选项。我可以预先在需要格式化的坐标图（坐标，线条组等）中引入其他线条。听起来更复杂，因为它需要。所以我希望，我可以修改剧情网格来完成这项工作。

一个例子说明我通常是如何绘制加载的shapefile <$ c $的数据框 sf.df c> sf ：

 （ggplot（sf.df，aes（x = long，y = lat））
 + geom_polygon（data = sf.df，aes（group = group，fill = NFK））
 + theme（panel.grid.major = element_line（color =black））
 + coord_map（xlim = c（7.08,7.14），ylim = c（50.93,50.96））
）
  

预先感谢您！

解决方案

正如@joran建议的那样，使用 geom_hline 和 geom_vline 绝对是一个解决方案。简单定义 yintercept 和 xintercept ，如下所示：

<$ $ x $ b + geom_hline（xintercept = seq（7.08,7.14，by = 0.01））
+ geom_hline（yintercept = seq（50.93,50.96，by = 0.01））
...

I would like to know if there is a way to let ggplot draw its grid lines in front of the plotted data. As far as I know, I can format almost everything easily by using theme() which works well so far. However, I don't find the option in which order the elements are drawn. I could introduce additional lines to the plot which need to be formatted (coordinates, line groups, etc.) beforehand. Sounds more complicated as it need to be. So I hope, I can modify the plot-grid itself to do the job.

An example of how I am usually plotting the data frame sf.df of the loaded shapefile sf:

(ggplot(sf.df, aes(x=long, y=lat))
+ geom_polygon(data=sf.df, aes(group=group, fill=NFK))
+ theme(panel.grid.major=element_line(colour="black"))
+ coord_map(xlim=c(7.08, 7.14), ylim=c(50.93, 50.96))
)

Thank you in advance!

解决方案

As @joran suggested, using geom_hline and geom_vline is defenitely a solution. Simple define the yintercept and xintercept respectively like so:

...
+ geom_vline(xintercept=seq(7.08, 7.14, by=0.01))
+ geom_hline(yintercept=seq(50.93, 50.96, by=0.01))
...

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