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plotting-pieGridGrob.R
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plotting-pieGridGrob.R
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##----------------------------------------------------------------------------##
## pieGridGrob
##----------------------------------------------------------------------------##
#' @name pieGridGrob
#' @title Make grid of pieGrobs
#' @description Make grid of pieGrobs
#'
#' @param radMat `matrix(<numeric>)`, observations by slice radii
#' @param wts `vector(<numeric>)`, relative weights of each slice
#' @param fills Vector of colors to fill slices
#' @param labels `vector(<character>)`, (optional) label for each observation
#' @param showRadSum Logical scalar, when `TRUE` show the weighted sum of slices
#' below the label
#' @param nrow,ncol Integer scalar, number of rows and columns for the grid
#' @param byrow Logical scalar, fill the grid by rows when `TRUE`
#' @param name,gp,vp Passed to [grid::gTree]
#'
#' @examples
#' \donttest{
#' library(grid)
#'
#' s <- seq(0.2, 1, by = 0.1)
#' smat <- do.call("rbind", replicate(20, s, simplify = FALSE))
#' grid.newpage()
#' grid.pieGridGrob(radMat = smat)
#'
#' rownames(smat) <- sprintf("obs%02d", 1:20)
#' grid.newpage()
#' grid.pieGridGrob(radMat = smat, wts = s)
#' grid.newpage()
#' grid.pieGridGrob(radMat = smat, wts = s, showRadSum = TRUE, labels = FALSE)
#' grid.newpage()
#' grid.pieGridGrob(radMat = smat, labels = "hello")
#' grid.newpage()
#' grid.pieGridGrob(radMat = smat, labels = 1:20)
#'
#' ## Can edit like normal grid objects
#' grid.newpage()
#' grid.pieGridGrob(radMat = smat, wts = s, showRadSum = TRUE)
#' grid.ls() ## shows grid elements
#' grid.edit("pie-20", fills = 1:9)
#' grid.edit("pie-19-label", gp = gpar(font = 2, col = "red"))
#' grid.edit("pie-1", wts = rep(1, 9), rads = rep(1, 9))
#' for (s in sprintf("pie-%d-radSum", 2:4)) {
#' grid.edit(s, gp = gpar(font = 2, col = "blue"))
#' }
#' }
#'
#' @return `pieGrob` [grid::grob] object
#'
#' @import grid
#' @importFrom rlang is_scalar_integerish is_scalar_logical
#' @importFrom grDevices colorRampPalette
#' @export
pieGridGrob <- function(radMat, wts = NULL, fills = NULL, labels = NULL,
showRadSum = FALSE, ncol = NULL, nrow = NULL,
byrow = TRUE, name = NULL, gp = NULL, vp = NULL) {
nPie <- NROW(radMat)
if (is.null(wts)) wts <- rep(1, NCOL(radMat))
wts <- wts/sum(wts)
if (is.null(labels) || (is.logical(labels) && labels)) {
labels <- rownames(radMat)
} else {
if (is.logical(labels) && !labels) labels <- NULL
}
pos <- makePieGridPos(nPie = nPie, nrow = nrow, ncol = ncol, byrow = byrow)
pieGridVp <- makePieGridViewport(pos = pos, nPie = nPie)
gTree(radMat = radMat,
wts = wts,
fills = fills,
labels = labels,
nPie = nPie,
pos = pos,
name = name,
gp = gp,
vp = vp,
children = makePieGridGrob(radMat = radMat,
pos = pos,
wts = wts,
fills = fills,
labels = labels,
showRadSum = showRadSum,
vp = pieGridVp),
childrenvp = pieGridVp,
cls = "pieGridGrob")
}
#' @rdname pieGridGrob
#' @export
grid.pieGridGrob <- function(radMat, wts = NULL, fills = NULL, labels = NULL,
showRadSum = FALSE, ncol = NULL, nrow = NULL,
byrow = TRUE, name = NULL, gp = NULL, vp = NULL) {
g <- pieGridGrob(radMat = radMat,
wts = wts,
fills = fills,
labels = labels,
showRadSum = showRadSum,
ncol = ncol,
nrow = nrow,
byrow = byrow,
name = name,
vp = vp,
gp = gp)
grid.draw(g)
}
makePieGridPos <- function(nPie, nrow = NULL, ncol = NULL, byrow = TRUE) {
stopifnot(is_scalar_integerish(nPie))
stopifnot(is.null(ncol) || is_scalar_integerish(ncol))
stopifnot(is.null(nrow) || is_scalar_integerish(nrow))
stopifnot(is_scalar_logical(byrow))
if (is.null(nrow) && is.null(ncol)) {
ncol <- ceiling(sqrt(nPie))
nrow <- ceiling(nPie/ncol)
} else {
if (is.null(nrow)) nrow <- ceiling(nPie/ncol)
if (is.null(ncol)) ncol <- ceiling(nPie/nrow)
}
if(byrow) {
pos <- expand.grid(col = 1:ncol, row = 1:nrow)
} else {
pos <- expand.grid(row = 1:nrow, col = 1:ncol)
}
pos
}
makePieGridViewport <- function(pos, nPie) {
nrow <- max(pos$row)
ncol <- max(pos$col)
gl <- grid.layout(nrow = nrow,
ncol = ncol,
widths = unit(rep_len(1, ncol), "null"),
heights = unit(rep(1, nrow), "null"))
gridVp <- viewport(layout = gl)
pieBoxes <- vector("list", nPie)
for (i in 1:nPie) {
pieBoxes[[i]] <- viewport(name = sprintf("pieBox-%s", i),
layout.pos.row = pos[i, "row"],
layout.pos.col = pos[i, "col"])
}
vpTree(gridVp, do.call("vpList", pieBoxes))
}
makePieGridGrob <- function(radMat, pos, wts = NULL, fills = NULL,
labels = NULL, showRadSum = FALSE, vp = NULL) {
nPie <- NROW(radMat)
pies <- vector("list", nPie)
for (i in 1:nPie) {
rads <- radMat[i, ]
pies[[i]] <- frameGrob(vp = vpStack(vp$parent, vp$children[[i]]))
pies[[i]] <- packGrob(frame = pies[[i]],
grob = pieGrob(rads = rads,
fills = fills,
wts = wts,
name = sprintf("pie-%s", i)))
if (showRadSum) {
rsum <- round(sum(rads*wts, na.rm = TRUE), 4)
pies[[i]] <- packGrob(frame = pies[[i]],
grob = textGrob(label = rsum,
name = sprintf("pie-%s-radSum", i)),
side = "top",
height = unit(1.15, units = "char"))
}
if (!is.null(labels)) {
pies[[i]] <- packGrob(frame = pies[[i]],
grob = textGrob(label = labels[i],
name = sprintf("pie-%s-label", i)),
side = "top",
height = unit(1.15, units = "char"))
}
}
do.call("gList", pies)
}
##----------------------------------------------------------------------------##