仅在图形的一个区域上更改背景颜色 [英] Change background color on just one region of the graph

问题描述

我只想更改图形的一部分的背景色.有可能吗?

I would like to change the background color for just a portion of a graph. Is that possible?

例如，使用下面的图表，我可能想表明我对重量在2-4吨之间的汽车特别感兴趣，因此希望使用粉红色背景突出显示该区域.

For example, using the following chart I might want to indicate that I am particularly interested in cars that have a weight between 2 and 4 tons and thus would want to highlight this region using a pink background.

更具体地说，我想覆盖一个透明的粉红色矩形，该矩形在x轴上从2延伸到4，并覆盖整个y轴区域.

More specifically I'd like to overlay a transparent pink rectangle which stretches from 2 to 4 on the x axis and covers the entire y axis region.

我该如何编码?

p <- ggplot(mtcars, aes(wt, mpg))
p + geom_point()

推荐答案

使用geom_rect (文档).您只需要在对geom_rect的es调用中指定尺寸即可.要更改透明度，请在下面的代码中更改alpha.

The rectangle is easy using geom_rect (documentation). You just need to specify it's dimensions in the aes call to geom_rect. To change the transparency alter alpha in the code below.

 require(ggplot2)
 p <- ggplot(mtcars, aes(wt, mpg)) 
 p + geom_point() + 
     geom_rect(aes(xmin = 2, xmax = 4, ymin = -Inf, ymax = Inf),
                   fill = "pink", alpha = 0.03))

会产生类似您所追求的东西吗?

Does that produce something like what you're after?

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