gtable: gtable_add_rows – R documentation

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gtable_add_rows

Add new rows in specified position.

Description

Insert new rows in a gtable and adjust the grob placement accordingly. If rows are added in the middle of a grob spanning multiple rows, the grob will continue to span them all. If a row is added above or below a grob, the grob will not span the new row(s).

Usage

gtable_add_rows(x, heights, pos = -1)

Arguments

`x`	a `gtable()` object
`heights`	a unit vector giving the heights of the new rows
`pos`	new row will be added below this position. Defaults to adding row on bottom. `0` adds on the top.

Value

A gtable with the new rows added.

Examples

library(grid)
rect <- rectGrob(gp = gpar(fill = "#00000080"))
tab <- gtable(unit(rep(1, 3), "null"), unit(rep(1, 3), "null"))
tab <- gtable_add_grob(tab, rect, t = 1, l = 1, r = 3)
tab <- gtable_add_grob(tab, rect, t = 1, b = 3, l = 1)
tab <- gtable_add_grob(tab, rect, t = 1, b = 3, l = 3)
dim(tab)
plot(tab)

# Grobs will continue to span over new rows if added in the middle
tab2 <- gtable_add_rows(tab, unit(1, "null"), 1)
dim(tab2)
plot(tab2)

# But not when added to top (0) or bottom (-1, the default)
tab3 <- gtable_add_rows(tab, unit(1, "null"))
tab3 <- gtable_add_rows(tab3, unit(1, "null"), 0)
dim(tab3)
plot(tab3)

gtable

Arrange 'Grobs' in Tables

v0.3.0

GPL-2

Authors

Hadley Wickham [aut, cre], Thomas Lin Pedersen [aut], RStudio [cph]

Initial release