% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/add-rows-cols.r
\name{gtable_add_rows}
\alias{gtable_add_rows}
\title{Add new rows in specified position.}
\usage{
gtable_add_rows(x, heights, pos = -1)
}
\arguments{
\item{x}{a \code{\link[=gtable]{gtable()}} object}

\item{heights}{a unit vector giving the heights of the new rows}

\item{pos}{new row will be added below this position. Defaults to
adding row on bottom. \code{0} adds on the top.}
}
\value{
A gtable with the new rows added.
}
\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).
}
\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)

}
\seealso{
Other gtable manipulation: 
\code{\link{gtable_add_cols}()},
\code{\link{gtable_add_grob}()},
\code{\link{gtable_add_padding}()},
\code{\link{gtable_add_space}},
\code{\link{gtable_filter}()}
}
\concept{gtable manipulation}