gtable: gtable_add_cols – R documentation

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gtable_add_cols

Add new columns in specified position.

Description

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

Usage

gtable_add_cols(x, widths, pos = -1)

Arguments

`x`	a `gtable()` object
`widths`	a unit vector giving the widths of the new columns
`pos`	new columns will be added to the right of this position. Defaults to adding col on right. `0` adds on the left.

Value

A gtable with the new columns 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_cols(tab, unit(1, "null"), 1)
dim(tab2)
plot(tab2)

# But not when added to left (0) or right (-1, the default)
tab3 <- gtable_add_cols(tab, unit(1, "null"))
tab3 <- gtable_add_cols(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