R/mp.R

Defines functions mp

#' Function for creating multiple 'ggplot()'s on one plot page (uses the `{grid}` package with `{ggplot2}`)
#'
#' [^mp]: \rurl{http://www.cookbook-r.com/Graphs/Multiple_graphs_on_one_page_(ggplot2)/}
#'
#'
mp <- function(...,
               plotlist = NULL,
               file,
               cols = 1,
               layout = NULL) {
    library(grid)
    # Make a list from the ... arguments and plotlist
    plots <- c(list(...), plotlist)
    numPlots = length(plots)
    # If layout is NULL, then use 'cols' to determine layout
    if (is.null(layout)) {
        # Make the panel
        # ncol: Number of columns of plots
        # nrow: Number of rows needed, calculated from # of cols
        layout <- matrix(seq(1, cols * ceiling(numPlots / cols)),
                         ncol = cols,
                         nrow = ceiling(numPlots / cols))
    }
    if (numPlots == 1) {
        print(plots[[1]])
    }
    else {
        # Set up the page
        grid.newpage()
        pushViewport(viewport(layout = grid.layout(nrow(layout), ncol(layout))))
        # Make each plot, in the correct location
        for (i in 1:numPlots) {
            # Get the i,j matrix positions of the regions that contain this subplot
            matchidx <-
                as.data.frame(which(layout == i, arr.ind = TRUE))
            print(
                plots[[i]],
                vp = viewport(
                    layout.pos.row = matchidx$row,
                    layout.pos.col = matchidx$col
                )
            )
        }
    }
}
#'
EccRiley/Riley documentation built on Feb. 15, 2024, 9:29 a.m.