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#' @title Function for creating a multi-panel logo viewport
#'
#' @description This is a void function to be run prior to a multi-panel Logolas
#' plot for a fixed number of rows and columns of the panel.
#'
#' @param layout.rows The number of rows in the panel
#' @param layout.cols The number of columns in the panel
#' @param widths_1 The widths of each viewport in the panel
#' @param heights_1 The heights of each viewport in the panel
#' @return Creates a panel of viewports for each row and each column, to be
#' subsequently used for creating logo plots.
#' @import grid
#' @importFrom graphics par
#' @examples
#'
#' get_viewport_logo(layout.rows = 2, layout.cols = 2)
#' @export
get_viewport_logo <- function(layout.rows, layout.cols,
widths_1 = 6, heights_1 = 20){
grid::grid.newpage()
top.vp <- viewport(layout=grid.layout(layout.rows, layout.cols,
widths=unit(rep(widths_1,layout.cols),
rep("null", layout.cols)),
heights=unit(rep(heights_1,layout.rows),
rep("lines", layout.rows))))
plot_reg <- vpList()
l <- 1
for(i in 1:layout.rows){
for(j in 1:layout.cols){
plot_reg[[l]] <- viewport(layout.pos.col = j, layout.pos.row = i,
name = paste0("plotlogo", l))
l <- l+1
}
}
plot_tree <- vpTree(top.vp, plot_reg)
pushViewport(plot_tree)
}
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