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pieglyphGrob.R
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pieglyphGrob.R
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#' Draw a Pie Glyph
#'
#' Uses \code{\link[grid]{Grid}} graphics to draw a circular pie or clock glyph
#' \insertCite{ward_visualization_2000,fuchs_evaluation_2013}{gglyph}.
#'
#' @param x A numeric vector or unit object specifying x-locations.
#' @param y A numeric vector or unit object specifying y-locations.
#' @param z A numeric vector specifying the values to be plotted as dimensions
#' of the pie glyph according to the arguments \code{scale.segment} or
#' \code{scale.radius}.
#' @param size The size of glyphs (radius).
#' @param edges The number of edges of the polygon to depict the circular glyph
#' outline.
#' @param col The line colour.
#' @param fill The fill colour.
#' @param lwd The line width.
#' @param alpha The alpha transparency value.
#' @param angle.start The start angle for the glyph in radians. Default is zero.
#' @param angle.stop The stop angle for the glyph in radians. Default is
#' \eqn{2\pi}.
#' @param linejoin The line join style for the pie segment polygons. Either
#' \code{"mitre"}, \code{"round"} or \code{"bevel"}.
#' @param scale.segment logical. If \code{TRUE}, the segments (pie slices) are
#' scaled according to value of \code{z}.
#' @param scale.radius logical. If \code{TRUE}, the radius of segments (pie
#' slices) are scaled according to value of \code{z}.
#' @param draw.grid logical. If \code{TRUE}, grid lines are plotted along the
#' segments when \code{scale.radius = TRUE}. Default is \code{FALSE}.
#' @param grid.levels A list of grid levels (as vectors) corresponding to the
#' values in \code{z} at which grid lines are to be plotted. The values in
#' \code{z} should be present in the list specified.
#' @param lwd.grid The line width of the grid lines.
#' @param col.grid The colour of the grid lines.
#'
#' @family grobs
#'
#' @return A \code{\link[grid]{gTree}} object.
#'
#' @importFrom grid gpar polygonGrob nullGrob grobTree unit unit.c
#' @importFrom scales rescale
#' @export
#'
#' @seealso \code{\link[gglyph]{geom_pieglyph}}
#'
#' @references
#'
#' \insertAllCited{}
#'
#' @examples
#' p1 <- pieglyphGrob(x = 250, y = 200,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20)
#'
#' p2 <- pieglyphGrob(x = 500, y = 200,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, scale.radius = FALSE)
#'
#' p3 <- pieglyphGrob(x = 900, y = 200,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, scale.segment = TRUE, scale.radius = FALSE)
#'
#' p4 <- pieglyphGrob(x = 250, y = 650,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, angle.start = 0, angle.stop = base::pi)
#'
#' p5 <- pieglyphGrob(x = 500, y = 650,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, scale.radius = FALSE,
#' angle.start = 0, angle.stop = base::pi)
#'
#' p6 <- pieglyphGrob(x = 900, y = 650,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, scale.segment = TRUE, scale.radius = FALSE,
#' angle.start = 0, angle.stop = base::pi)
#'
#' grid::grid.newpage()
#' grid::grid.draw(p1)
#' grid::grid.draw(p2)
#' grid::grid.draw(p3)
#' grid::grid.draw(p4)
#' grid::grid.draw(p5)
#' grid::grid.draw(p6)
#'
#' p1 <- pieglyphGrob(x = 250, y = 200,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#' p2 <- pieglyphGrob(x = 500, y = 200,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, scale.radius = FALSE,
#' fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#' p3 <- pieglyphGrob(x = 900, y = 200,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, scale.segment = TRUE, scale.radius = FALSE,
#' fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#' p4 <- pieglyphGrob(x = 250, y = 650,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, angle.start = 0, angle.stop = base::pi,
#' fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#' p5 <- pieglyphGrob(x = 500, y = 650,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, scale.radius = FALSE,
#' angle.start = 0, angle.stop = base::pi,
#' fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#' p6 <- pieglyphGrob(x = 900, y = 650,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, scale.segment = TRUE, scale.radius = FALSE,
#' angle.start = 0, angle.stop = base::pi,
#' fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#' grid::grid.newpage()
#' grid::grid.draw(p1)
#' grid::grid.draw(p2)
#' grid::grid.draw(p3)
#' grid::grid.draw(p4)
#' grid::grid.draw(p5)
#' grid::grid.draw(p6)
#'
#' p1 <- pieglyphGrob(x = 300, y = 250,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, lwd = 5)
#'
#' p2 <- pieglyphGrob(x = 500, y = 450,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, lwd = 5, linejoin = "round")
#'
#' p3 <- pieglyphGrob(x = 700, y = 650,
#' z = c(0.24, 0.3, 0.8, 1.4, 0.6, 0.33),
#' size = 20, lwd = 5, linejoin = "bevel")
#'
#' grid::grid.newpage()
#' grid::grid.draw(p1)
#' grid::grid.draw(p2)
#' grid::grid.draw(p3)
#'
#' dims = c(1, 3, 2, 1, 2, 3)
#' gl <- split(x = rep(c(1, 2, 3), 6),
#' f = rep(1:6, each = 3))
#'
#' p1 <- pieglyphGrob(x = 200, y = 250,
#' z = dims, size = 8,
#' draw.grid = TRUE, grid.levels = gl,
#' lwd = 2, col.grid = "black")
#'
#' p2 <- pieglyphGrob(x = 700, y = 250,
#' angle.start = 0, angle.stop = base::pi,
#' z = dims, size = 8,
#' draw.grid = TRUE, grid.levels = gl,
#' lwd = 2, col.grid = "black")
#'
#' p3 <- pieglyphGrob(x = 200, y = 600,
#' z = dims, size = 8, scale.segment = TRUE,
#' draw.grid = TRUE, grid.levels = gl,
#' lwd = 2, col.grid = "black")
#'
#' p4 <- pieglyphGrob(x = 700, y = 600,
#' angle.start = 0, angle.stop = base::pi,
#' z = dims, size = 8, scale.segment = TRUE,
#' draw.grid = TRUE, grid.levels = gl,
#' lwd = 2, col.grid = "black")
#'
#' grid::grid.newpage()
#' grid::grid.draw(p1)
#' grid::grid.draw(p2)
#' grid::grid.draw(p3)
#' grid::grid.draw(p4)
#'
#' dims = c(1, 3, 2, 1, 2, 3)
#' gl <- split(x = rep(c(1, 2, 3), 6),
#' f = rep(1:6, each = 3))
#'
#' p1 <- pieglyphGrob(x = 200, y = 250,
#' z = dims, size = 8, col = "white",
#' draw.grid = TRUE, grid.levels = gl,
#' lwd = 3, col.grid = "white",
#' fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#' p2 <- pieglyphGrob(x = 700, y = 250,
#' angle.start = 0, angle.stop = base::pi,
#' z = dims, size = 8, col = "white",
#' draw.grid = TRUE, grid.levels = gl,
#' lwd = 3, col.grid = "white",
#' fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#' p3 <- pieglyphGrob(x = 200, y = 600,
#' z = dims, size = 8,
#' col = "white", scale.segment = TRUE,
#' draw.grid = TRUE, grid.levels = gl,
#' lwd = 3, col.grid = "white",
#' fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#' p4 <- pieglyphGrob(x = 700, y = 600,
#' angle.start = 0, angle.stop = base::pi,
#' z = dims, size = 8,
#' col = "white", scale.segment = TRUE,
#' draw.grid = TRUE, grid.levels = gl,
#' lwd = 3, col.grid = "white",
#' fill = RColorBrewer::brewer.pal(6, "Dark2"))
#'
#'
#' grid::grid.newpage()
#' grid::grid.draw(p1)
#' grid::grid.draw(p2)
#' grid::grid.draw(p3)
#' grid::grid.draw(p4)
#'
pieglyphGrob <- function(x = .5, y = .5, z,
size = 1, edges = 200,
col = "black",
fill = NA,
lwd = 1,
alpha = 1,
angle.start = 0,
angle.stop = 2 * base::pi,
linejoin = c("mitre", "round", "bevel"),
scale.segment = FALSE,
scale.radius = TRUE,
grid.levels = NULL,
draw.grid = FALSE,
col.grid = "grey",
lwd.grid = lwd) {
linejoin <- match.arg(linejoin)
# grid::grid.points(x = x, y = y, pch = 20)
drawgridlines <- FALSE
# Checks for grid lines
drawgridlines <- FALSE
if (draw.grid) {
if (scale.radius ) {
if (!is.null(grid.levels)) { # Check if grid lines are to be plotted
# Check if grid.levels is a list in appropriate format
if (is.list(grid.levels) &
all(unlist( lapply(grid.levels,
function(x) is.numeric(x) | is.integer(x))))) {
# Check if z is present in corresponding grid.levels
if (!all(mapply(function(a, b) a %in% b, z, grid.levels))) {
warning('Mismatch in values "z" values and corresponding "grid.levels".\n',
'Unable to plot grid lines.')
} else {
drawgridlines <- TRUE
}
} else {
warning('Non-standard format specified as "grid.levels".\n',
'Unable to plot grid lines.')
}
} else {
warning('"grid.levels" not specified.\n',
'Unable to plot grid lines.')
}
} else {
warning('"scale.radius" is FALSE.\n',
'Unable to plot grid lines.')
}
}
# Get polygon points
dimension <- length(z)
# angle <- seq(angle.start, 2*base::pi, length.out = dimension + 1)[1:dimension]
# Convert z to cumulative proportions
if (scale.segment) {
cumpropz <- c(0, cumsum(z) / sum(z))
} else {
# Convert z to cumulative proportions
# cumpropz <- c(0, scales::rescale(1:dimension))
cumpropz <- c(scales::rescale(0:dimension))
}
diffz <- diff(cumpropz)
# segxylist <- vector("list", dimension)
segarcx <- vector("list", dimension)
segarcy <- vector("list", dimension)
segarcid <- vector("list", dimension)
if (drawgridlines) {
# gridxylist <- vector("list", dimension)
gridarcx <- vector("list", dimension)
gridarcy <- vector("list", dimension)
gridarcid <- vector("list", dimension)
grid.levels <- mapply(function(a, b) b[b <= a], z, grid.levels)
grid.levels <- mapply(function(a, b) setdiff(b, a), z, grid.levels)
}
for (i in 1:dimension) {
# No. of nodes for sector arc
n <- max(2, floor(edges * diffz[i]))
# Sector arc points
arcp <- seq.int(cumpropz[i], cumpropz[i + 1], length.out = n)
# Sector arc point radians
arcpr <- (angle.stop * arcp) + (angle.start * (pi / 180))
# Sector arc coordinates
if (!scale.radius) {
# segxylist[[i]] <- data.frame(arcx = c(x, x + (size * cos(arcpr))),
# arcy = c(y, y + (size * sin(arcpr))),
# arcid = i)
segarcx[[i]] <- unit.c(unit(x, "native") + unit(0, "mm"),
unit(x, "native") +
unit(size * cos(arcpr), "mm"))
segarcy[[i]] <- unit.c(unit(y, "native") + unit(0, "mm"),
unit(y, "native") +
unit(size * sin(arcpr), "mm"))
segarcid[[i]] <- rep(i, length(arcp) + 1)
} else {
# segxylist[[i]] <- data.frame(arcx = c(x, x + (z[i] * size * cos(arcpr))),
# arcy = c(y, y + (z[i] * size * sin(arcpr))),
# arcid = i)
segarcx[[i]] <- unit.c(unit(x, "native"),
unit(x, "native") +
unit(z[i] * size * cos(arcpr),
"mm"))
segarcy[[i]] <- unit.c(unit(y, "native"),
unit(y, "native") +
unit(z[i] * size * sin(arcpr),
"mm"))
segarcid[[i]] <- rep(i, length(arcp) + 1)
if (drawgridlines) {
# gridxylist[[i]] <- lapply(grid.levels[[i]],
# function(a) if (length(a) == 0) {
# NA
# } else{
# lapply(a,
# function(b) data.frame(arcx = c(x + (b * size * cos(arcpr))),
# arcy = c(y + (b * size * sin(arcpr))),
# arcid = paste(i, "_", b, sep = "")))
# })
gridarcx[[i]] <- lapply(grid.levels[[i]],
function(a) if (length(a) == 0) {
NA
} else{
upgradeUnit.unit.list(lapply(a,
function(b) unit.c(unit(x, "native") +
unit(b * size * cos(arcpr), "mm"))))
})
gridarcy[[i]] <- lapply(grid.levels[[i]],
function(a) if (length(a) == 0) {
NA
} else{
upgradeUnit.unit.list(lapply(a,
function(b) unit.c(unit(y, "native") +
unit(b * size * sin(arcpr), "mm"))))
})
gridarcid[[i]] <- lapply(grid.levels[[i]],
function(a) if (length(a) == 0) {
NA
} else{
unlist(lapply(a, function(b) rep(paste(i, "_", b, sep = ""),
length(arcp))))
})
}
}
}
# segxy <- dplyr::bind_rows(segxylist)
segarcx <- upgradeUnit.unit.list(segarcx)
segarcy <- upgradeUnit.unit.list(segarcy)
segarcid <- unlist(segarcid)
# segarcid <- rep(1:dimension, each = length(arcp) +1)
#NullGrobs
circsegGrob <- grid::nullGrob()
glinesGrob <- grid::nullGrob()
circsegGrob <- grid::polygonGrob(x = segarcx,
y = segarcy,
id = segarcid,
# x = segxy$arcx,
# y = segxy$arcy,
# id = segxy$arcid,
# default.units = "native",
gp = grid::gpar(col = col,
fill = fill,
lwd = lwd,
alpha = alpha,
linejoin = linejoin))
if (drawgridlines) {
# gridxy <- dplyr::bind_rows(lapply(gridxylist, dplyr::bind_rows))
gridarcx <- lapply(gridarcx, function(a) if (length(a) > 0) {
upgradeUnit.unit.list(a)
})
gridarcy <- lapply(gridarcy, function(a) if (length(a) > 0) {
upgradeUnit.unit.list(a)
})
gridarcid <- lapply(gridarcid, function(a) if (length(a) > 0) {
unlist(a)
})
gridarcx <- upgradeUnit.unit.list(gridarcx[!sapply(gridarcx, is.null)])
gridarcy <- upgradeUnit.unit.list(gridarcy[!sapply(gridarcy, is.null)])
gridarcid <- unlist(gridarcid[!sapply(gridarcid, is.null)])
gridarcid <- as.numeric(as.factor(gridarcid))
# gridxy$arcid <- as.numeric(as.factor(gridxy$arcid))
glinesGrob <- grid::polylineGrob(x = gridarcx,
y = gridarcy,
id = gridarcid,
# x = gridxy$arcx,
# y = gridxy$arcy,
# id = gridxy$arcid,
# default.units = "native",
gp = grid::gpar(col = col.grid,
lwd = lwd.grid,
lineend = "butt",
alpha = alpha))
}
gridout <- grid::grobTree(circsegGrob, glinesGrob,
gp = grid::gpar(lwd = lwd, alpha = alpha,
fill = fill,
linejoin = linejoin))
return(gridout)
}