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101 lines
3.3 KiB
101 lines
3.3 KiB
#' Dumbell charts
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#'
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#' The dumbbell geom is used to create dumbbell charts.
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#'
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#' Dumbbell dot plots — dot plots with two or more series of data — are an
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#' alternative to the clustered bar chart or slope graph.\cr
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#' \cr
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#' Use these dot plots to visualize two or three different points in time. Or,
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#' use them to triangulate different viewpoints (e.g., one dot for Republicans
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#' and another dot for Democrats, or one dot for principals and another dot for
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#' teachers).
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#'
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#' @section Aesthetics:
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#' \Sexpr[results=rd,stage=build]{ggplot2:::rd_aesthetics("geom", "point")}
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#' @inheritParams ggplot2::layer
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#' @param na.rm If \code{FALSE} (the default), removes missing values with
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#' a warning. If \code{TRUE} silently removes missing values.
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#' @param ... other arguments passed on to \code{\link{layer}}. These are
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#' often aesthetics, used to set an aesthetic to a fixed value, like
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#' \code{color = "red"} or \code{size = 3}. They may also be parameters
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#' to the paired geom/stat.
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#' @param point.size.l the size of the left point
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#' @param point.colour.l the colour of the left point
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#' @param point.size.r the size of the right point
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#' @param point.colour.r the colour of the right point
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#' @inheritParams ggplot2::layer
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#' @export
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#' @examples
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#' df <- data.frame(trt=LETTERS[1:10],
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#' value=seq(100, 10, by=-10))
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#'
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#' ggplot(df, aes(trt, value)) + geom_lollipop()
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#'
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#' ggplot(df, aes(value, trt)) + geom_lollipop(horizontal=TRUE)
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geom_dumbbell <- function(mapping = NULL, data = NULL, ...,
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point.colour.l = NULL, point.size.l = NULL,
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point.colour.r = NULL, point.size.r = NULL,
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na.rm = FALSE, show.legend = NA, inherit.aes = TRUE) {
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layer(
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data = data,
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mapping = mapping,
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stat = "identity",
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geom = GeomDumbbell,
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position = "identity",
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show.legend = show.legend,
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inherit.aes = inherit.aes,
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params = list(
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na.rm = na.rm,
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point.colour.l = point.colour.l,
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point.size.l = point.size.l,
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point.colour.r = point.colour.r,
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point.size.r = point.size.r,
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...
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)
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)
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}
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#' @rdname ggalt-ggproto
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#' @format NULL
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#' @usage NULL
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#' @export
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GeomDumbbell <- ggproto("GeomDumbbell", Geom,
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required_aes = c("x", "xend", "y"),
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non_missing_aes = c("size", "shape",
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"point.colour.l", "point.size.l",
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"point.colour.r", "point.size.r"),
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default_aes = aes(
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shape = 19, colour = "black", size = 0.5, fill = NA,
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alpha = NA, stroke = 0.5
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),
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setup_data = function(data, params) {
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transform(data, yend = y)
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},
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draw_group = function(data, panel_scales, coord,
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point.colour.l = NULL, point.size.l = NULL,
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point.colour.r = NULL, point.size.r = NULL) {
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points.r <- data
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points.r$colour <- point.colour.r %||% data$colour
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points.r$size <- point.size.r %||% (data$size * 2.5)
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points.l <- data
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points.l$x <- points.l$xend
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points.l$colour <- point.colour.l %||% data$colour
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points.l$size <- point.size.l %||% (data$size * 2.5)
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gList(
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ggplot2::GeomSegment$draw_panel(data, panel_scales, coord),
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ggplot2::GeomPoint$draw_panel(points.l, panel_scales, coord),
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ggplot2::GeomPoint$draw_panel(points.r, panel_scales, coord)
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)
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},
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draw_key = draw_key_point
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)
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