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# Visualize Violin plot
GeomSplitViolin <- ggproto("GeomSplitViolin", GeomViolin,
draw_group = function(self, data, ..., draw_quantiles = NULL) {
# Original function by Jan Gleixner (@jan-glx)
# Adjustments by Wouter van der Bijl (@Axeman)
data <- transform(data, xminv = x - violinwidth * (x - xmin), xmaxv = x + violinwidth * (xmax - x))
grp <- data[1, "group"]
newdata <- plyr::arrange(transform(data, x = if (grp %% 2 == 1) xminv else xmaxv), if (grp %% 2 == 1) y else -y)
newdata <- rbind(newdata[1, ], newdata, newdata[nrow(newdata), ], newdata[1, ])
newdata[c(1, nrow(newdata) - 1, nrow(newdata)), "x"] <- round(newdata[1, "x"])
if (length(draw_quantiles) > 0 & !scales::zero_range(range(data$y))) {
stopifnot(all(draw_quantiles >= 0), all(draw_quantiles <= 1))
quantiles <- create_quantile_segment_frame(data, draw_quantiles, split = TRUE, grp = grp)
aesthetics <- data[rep(1, nrow(quantiles)), setdiff(names(data), c("x", "y")), drop = FALSE]
aesthetics$alpha <- rep(1, nrow(quantiles))
both <- cbind(quantiles, aesthetics)
quantile_grob <- GeomPath$draw_panel(both, ...)
ggplot2:::ggname("geom_split_violin", grid::grobTree(GeomPolygon$draw_panel(newdata, ...), quantile_grob))
}
else {
ggplot2:::ggname("geom_split_violin", GeomPolygon$draw_panel(newdata, ...))
}
}
)
# Visualize Violin plot
create_quantile_segment_frame <- function(data, draw_quantiles, split = FALSE, grp = NULL) {
interleave <- "ggplot2" %:::% "interleave"
dens <- cumsum(data$density) / sum(data$density)
suppressWarnings(ecdf <- stats::approxfun(dens, data$y))
ys <- ecdf(draw_quantiles)
violin.xminvs <- (stats::approxfun(data$y, data$xminv))(ys)
violin.xmaxvs <- (stats::approxfun(data$y, data$xmaxv))(ys)
violin.xs <- (stats::approxfun(data$y, data$x))(ys)
if (grp %% 2 == 0) {
data.frame(
x = interleave(violin.xs, violin.xmaxvs),
y = rep(ys, each = 2), group = rep(ys, each = 2)
)
} else {
data.frame(
x = interleave(violin.xminvs, violin.xs),
y = rep(ys, each = 2), group = rep(ys, each = 2)
)
}
}
# Visualize Violin plot
geom_split_violin <- function(mapping = NULL, data = NULL, stat = "ydensity", position = "identity", ...,
draw_quantiles = NULL, trim = TRUE, scale = "area", na.rm = FALSE,
show.legend = NA, inherit.aes = TRUE) {
layer(
data = data, mapping = mapping, stat = stat, geom = GeomSplitViolin, position = position,
show.legend = show.legend, inherit.aes = inherit.aes,
params = list(trim = trim, scale = scale, draw_quantiles = draw_quantiles, na.rm = na.rm, ...)
)
}
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