pass ggplot2 objects in HeatmapAnnotation()

[RudRho]

Hi Gu,

Just wondering is it possible to pass ggplot into the HeatmapAnnotation()? This could be a great expansion of many features on the annotations. Like a density plot in rowAnnotation colored by wether samples with mutation or not.

Understand this is asking too much. But any response is greatly appreciated.

Cheers,
MJ

[jokergoo]

Theoretically yes, but I haven't tried so far. See following example:

library(ggplot2)
g = ggplot(mpg, aes(displ, hwy, colour = class)) + geom_point()

m = matrix(rnorm(100), 10)
Heatmap(m, top_annotation = HeatmapAnnotation(ggplot = anno_empty(height = unit(6, "cm"))))

decorate_annotation("ggplot", {
	vp = current.viewport()$name
	print(g, vp = vp)
})

Because you can draw the ggplot2 object in a certain viewport and each heatmap annotation contains a viewport that users can access, but you need to make sure the graphic elements in ggplot2 plots are properly aligned to the heatmap rows or columns.

[RudRho]

This is greaaat!

I will try seeing if the alignment works. I will keep you updated.

Cheers
MJ