#' stat_chevron

#'

#' @param geom Geom

#'

#' @rdname chevron

stat_chevron <- function(mapping = NULL, data = NULL,

geom = "polygon", position = "identity",

na.rm = FALSE, show.legend = NA,

inherit.aes = TRUE, angle = 0, ...) {

layer(

stat = StatChevron,

data = data,

mapping = mapping,

geom = geom,

position = position,

show.legend = show.legend,

inherit.aes = inherit.aes,

params = list(

angle = angle,

na.rm = na.rm,

...

)

)

}

# Statchevron

StatChevron <- ggplot2::ggproto(

"StatChevron",

Stat,

required_aes = c("xmin", "xmax", "ymin", "ymax"),

setup_params = function(data, params) {

return(params)

},

compute_panel = function(data, scales, angle = params$angle,

rotate_at = params$rotate_at) {

dat_out <- make_chevron(

data$xmin, data$xmax, data$ymin, data$ymax,

angle = angle, rotate_at = rotate_at

) |>

left_join(

data |>

mutate(id = row_number()) |>

select(-xmin, -xmax, -ymin, -ymax),

by = "id"

) |>

mutate(group = id)

return(dat_out)

}

)

#' GeomBrick

GeomChevron <- ggplot2::ggproto(

"GeomChevron",

GeomPolygon,

default_aes = aes(

colour = "black",

fill = "grey90",

linewidth = 0.5,

linetype = 1,

alpha = NA

),

angle = 0,

rotate_at = "head"

)

#' Polygon chevron

#'

#' Creates a chevron polygon.

#'

#' @param mapping Set of aesthetic mappings created by [aes()]. If specified and

#' `inherit.aes = TRUE` (the default), it is combined with the default mapping

#' at the top level of the plot. You must supply `mapping` if there is no plot

#' mapping.

#' @param data The data to be displayed in this layer. There are three

#' options:

#'

#' If `NULL`, the default, the data is inherited from the plot

#' data as specified in the call to [ggplot()].

#'

#' A `data.frame`, or other object, will override the plot

#' data. All objects will be fortified to produce a data frame. See

#' [fortify()] for which variables will be created.

#'

#' A `function` will be called with a single argument,

#' the plot data. The return value must be a `data.frame`, and

#' will be used as the layer data. A `function` can be created

#' from a `formula` (e.g. `~ head(.x, 10)`).

#' @param stat The statistical transformation to use on the data for this

#' layer, either as a `ggproto` `Geom` subclass or as a string naming the

#' stat stripped of the `stat_` prefix (e.g. `"count"` rather than

#' `"stat_count"`)

#' @param position Position adjustment, either as a string naming the adjustment

#' (e.g. `"jitter"` to use `position_jitter`), or the result of a call to a

#' position adjustment function. Use the latter if you need to change the

#' settings of the adjustment.

#' @param show.legend logical. Should this layer be included in the legends?

#' `NA`, the default, includes if any aesthetics are mapped.

#' `FALSE` never includes, and `TRUE` always includes.

#' It can also be a named logical vector to finely select the aesthetics to

#' display.

#' @param inherit.aes If `FALSE`, overrides the default aesthetics,

#' rather than combining with them. This is most useful for helper functions

#' that define both data and aesthetics and shouldn't inherit behaviour from

#' the default plot specification, e.g. [borders()].

#' @param na.rm If `FALSE` removes `NA`s from the data.

#' @param angle Angle to rotate each callout box.

#' @param rotate_at The point of rotation, either 'head' or 'center'.

#' @param ... Dots

#'

#' @import dplyr

#' @import ggplot2

#' @importFrom purrr map_dfr

#'

#' @return Grob

#' @export

#'

#' @name chevron

#'

#' @examples

#' library(ggplot2)

#' library(dplyr)

geom_chevron <- function(mapping = NULL, data = NULL, stat = "chevron",

position = "identity", na.rm = FALSE,

show.legend = NA, inherit.aes = TRUE,

angle = 0, rotate_at = "head", ...) {

layer(

geom = GeomChevron,

data = data,

mapping = mapping,

stat = stat,

position = position,

show.legend = show.legend,

inherit.aes = inherit.aes,

params = list(

angle = angle,

rotate_at = rotate_at,

na.rm = na.rm,

...)

)

}