anno_zoom: Zoom annotation
In zhongmicai/complexHeatmap: Make Complex Heatmaps

Description Usage Arguments Details Value See Also Examples

Zoom annotation

anno_zoom(align_to, panel_fun = function(index, nm = NULL) { grid.rect() },
    which = c("column", "row"), side = ifelse(which == "column", "top", "right"),
    size = NULL, gap = unit(1, "mm"),
    link_width = unit(5, "mm"), link_height = link_width, link_gp = gpar(),
    extend = unit(0, "mm"), width = NULL, height = NULL)

`align_to`	It defines how the boxes correspond to the rows or the columns in the heatmap. If the value is a list of indices, each box corresponds to the rows or columns with indices in one vector in the list. If the value is a categorical variable (e.g. a factor or a character vector) that has the same length as the rows or columns in the heatmap, each box corresponds to the rows/columns in each level in the categorical variable.
`panel_fun`	A self-defined function that defines how to draw graphics in the box. The function must have a `index` argument which is the indices for the rows/columns that the box corresponds to. It can have second argument `nm` which is the "name" of the selected part in the heatmap. The corresponding value for `nm` comes from `align_to` if it is specified as a categorical variable or a list with names.
`which`	Whether it is a column annotation or a row annotation?
`side`	Side of the boxes If it is a column annotation, valid values are "top" and "bottom"; If it is a row annotation, valid values are "left" and "right".
`size`	The size of boxes. It can be pure numeric that they are treated as relative fractions of the total height/width of the heatmap. The value of `size` can also be absolute units.
`gap`	Gaps between boxes.
`link_gp`	Graphic settings for the segments.
`link_width`	Width of the segments.
`link_height`	Similar as `link_width`, used for column annotation.
`extend`	By default, the region for the labels has the same width (if it is a column annotation) or same height (if it is a row annotation) as the heatmap. The size can be extended by this options. The value can be a proportion number or a `unit` object. The length can be either one or two.
`width`	Width of the annotation. The value should be an absolute unit. Width is not allowed to be set for column annotation.
`height`	Height of the annotation. The value should be an absolute unit. Height is not allowed to be set for row annotation.

anno_zoom creates several plotting regions (boxes) which can be corresponded to subsets of rows/columns in the heatmap.

An annotation function which can be used in HeatmapAnnotation.

https://jokergoo.github.io/ComplexHeatmap-reference/book/heatmap-annotations.html#zoom-annotation

set.seed(123)
m = matrix(rnorm(100*10), nrow = 100)
subgroup = sample(letters[1:3], 100, replace = TRUE, prob = c(1, 5, 10))
rg = range(m)
panel_fun = function(index, nm) {
	pushViewport(viewport(xscale = rg, yscale = c(0, 2)))
	grid.rect()
	grid.xaxis(gp = gpar(fontsize = 8))
	grid.boxplot(m[index, ], pos = 1, direction = "horizontal")
	grid.text(paste("distribution of group", nm), mean(rg), y = 1.9, 
		just = "top", default.units = "native", gp = gpar(fontsize = 10))
	popViewport()
}
anno = anno_zoom(align_to = subgroup, which = "row", panel_fun = panel_fun, 
	size = unit(2, "cm"), gap = unit(1, "cm"), width = unit(4, "cm"))
Heatmap(m, right_annotation = rowAnnotation(foo = anno), row_split = subgroup)