逐面更改选项 [英] Change options on a per-facet basis

问题描述

我正在ggplot2中使用多个方面来绘制大量基因中表达的分布图.我的绘图命令非常通用:

I'm using facets in ggplot2 to plot the distribution of expression in a large number of genes. My plotting commands are pretty generic:

p <- ggplot(top_n,aes(x=value,fill=ptype))
p <- p + geom_density(alpha = 0.2)
p <- p + facet_wrap(~probe,...)

它们只是将top_n中的数据绘制为根据ptype变量着色的分布.看起来很棒.

they just plot the data in top_n as distributions coloured according to the ptype variable. It looks great.

但是，其中一些基因比其他基因更重要.例如，突出显示那些是转录因子(TFs)的基因真的很酷.一种方法是让我更改与TF对应的每个构面上的颜色标题框，背景色或类似颜色.

Some of these genes, however, are more important than others. It would be really cool to highlight those genes which are transcription factors (TFs), for example. One way would be for me to change the colour title box over each facet corresponding to a TF, or the background colour, or something like that.

我是否可以按每个方面设置图的选项?

Is there a way for me to set options of the plots on a per-facet basis?

在p对象中进行挖掘并没有打开我可以使用的任何内容，尽管我可能丢失了一些东西！

Digging around in the p object hasn't turned up anything I can use, though I'm probably missing something!

推荐答案

您可以在无限范围内使用geom_rect，并且填充颜色随切面的不同而变化.

You could use geom_rect with infinite extents and a fill colour that varies from facet to facet.

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