yoni sidi
6 years ago
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#' @title Draw spikelines on a plot |
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#' @description Segment reference lines that originate at an point |
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#' @inheritParams ggplot2::geom_line |
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#' @examples |
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#' |
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#' mtcars$name <- rownames(mtcars) |
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#' |
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#' p <- ggplot(data = mtcars, aes(x=mpg,y=disp)) + geom_point() |
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#' |
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#' p + geom_spikelines(data = mtcars[mtcars$carb==4,],linetype = 2) |
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#' |
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#' p + geom_spikelines(data = mtcars[mtcars$carb==4,],aes(colour = factor(gear)), linetype = 2) |
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#' |
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#' \dontrun{ |
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#' require(ggrepel) |
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#' p + geom_spikelines(data = mtcars[mtcars$carb==4,],aes(colour = factor(gear)), linetype = 2) + |
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#' ggrepel::geom_label_repel(data = mtcars[mtcars$carb==4,],aes(label = name)) |
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#' } |
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#' |
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#' @rdname geom_spikelines |
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#' @author Jonathan Sidi |
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#' @export |
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|
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geom_spikelines <- function(mapping = NULL, data = NULL, |
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stat = "identity", position = "identity", |
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..., |
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arrow = NULL, |
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lineend = "butt", |
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linejoin = "round", |
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na.rm = FALSE, |
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show.legend = NA, |
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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 = stat, |
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geom = GeomSpikelines, |
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position = position, |
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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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arrow = arrow, |
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lineend = lineend, |
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linejoin = linejoin, |
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na.rm = na.rm, |
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... |
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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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GeomSpikelines <- ggproto("GeomSpikelines", Geom, |
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required_aes = c("x", "y"), |
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non_missing_aes = c("linetype", "size", "shape"), |
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default_aes = aes(colour = "black", size = 0.5, linetype = 1, alpha = NA), |
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|
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draw_panel = function(data, panel_params, coord, arrow = NULL, |
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lineend = "butt", linejoin = "round", na.rm = FALSE) { |
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|
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data1 <- data |
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data2 <- data |
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|
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data1$xend <- data$x |
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data1$yend <- data$y |
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data1$y <- 0 |
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|
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|
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data2$xend <- data$x |
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data2$yend <- data$y |
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data2$x <- 0 |
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|
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data <- rbind(data1,data2) |
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|
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data <- remove_missing(data, na.rm = na.rm, |
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c("x", "y", "linetype", "size", "shape"), |
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name = "geom_spikelines") |
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if (empty(data)) return(zeroGrob()) |
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|
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if (coord$is_linear()) { |
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coord <- coord$transform(data, panel_params) |
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|
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ret <- grid::segmentsGrob(coord$x, coord$y, coord$xend, coord$yend, |
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default.units = "native", |
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gp = grid::gpar( |
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col = alpha(coord$colour, coord$alpha), |
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fill = alpha(coord$colour, coord$alpha), |
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lwd = coord$size * .pt, |
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lty = coord$linetype, |
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lineend = lineend, |
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linejoin = linejoin |
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), |
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arrow = arrow |
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) |
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|
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return(ret) |
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} |
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|
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data$group <- 1:nrow(data) |
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starts <- subset(data, select = c(-xend, -yend)) |
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ends <- plyr::rename(subset(data, select = c(-x, -y)), c("xend" = "x", "yend" = "y"), |
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warn_missing = FALSE) |
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|
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pieces <- rbind(starts, ends) |
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pieces <- pieces[order(pieces$group),] |
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|
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GeomPath$draw_panel(pieces, panel_params, coord, arrow = arrow, |
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lineend = lineend) |
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}, |
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|
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draw_key = draw_key_path |
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) |
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|
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empty <- function (df) |
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{ |
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is.null(df) || nrow(df) == 0 || ncol(df) == 0 |
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} |
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@ -0,0 +1,82 @@ |
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% Generated by roxygen2: do not edit by hand |
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% Please edit documentation in R/geom_spikelines.R |
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\name{geom_spikelines} |
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\alias{geom_spikelines} |
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\title{Draw spikelines on a plot} |
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\usage{ |
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geom_spikelines(mapping = NULL, data = NULL, stat = "identity", |
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position = "identity", ..., arrow = NULL, lineend = "butt", |
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linejoin = "round", na.rm = FALSE, show.legend = NA, |
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inherit.aes = TRUE) |
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} |
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\arguments{ |
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\item{mapping}{Set of aesthetic mappings created by \code{\link[=aes]{aes()}} or |
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\code{\link[=aes_]{aes_()}}. If specified and \code{inherit.aes = TRUE} (the |
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default), it is combined with the default mapping at the top level of the |
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plot. You must supply \code{mapping} if there is no plot mapping.} |
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|
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\item{data}{The data to be displayed in this layer. There are three |
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options: |
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If \code{NULL}, the default, the data is inherited from the plot |
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data as specified in the call to \code{\link[=ggplot]{ggplot()}}. |
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|
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A \code{data.frame}, or other object, will override the plot |
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data. All objects will be fortified to produce a data frame. See |
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\code{\link[=fortify]{fortify()}} for which variables will be created. |
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|
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A \code{function} will be called with a single argument, |
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the plot data. The return value must be a \code{data.frame.}, and |
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will be used as the layer data.} |
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|
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\item{stat}{The statistical transformation to use on the data for this |
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layer, as a string.} |
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|
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\item{position}{Position adjustment, either as a string, or the result of |
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a call to a position adjustment function.} |
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|
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\item{...}{Other arguments passed on to \code{\link[=layer]{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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|
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\item{arrow}{Arrow specification, as created by \code{\link[grid:arrow]{grid::arrow()}}.} |
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|
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\item{lineend}{Line end style (round, butt, square).} |
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|
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\item{linejoin}{Line join style (round, mitre, bevel).} |
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|
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\item{na.rm}{If \code{FALSE}, the default, missing values are removed with |
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a warning. If \code{TRUE}, missing values are silently removed.} |
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|
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\item{show.legend}{logical. Should this layer be included in the legends? |
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\code{NA}, the default, includes if any aesthetics are mapped. |
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\code{FALSE} never includes, and \code{TRUE} always includes. |
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It can also be a named logical vector to finely select the aesthetics to |
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display.} |
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|
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\item{inherit.aes}{If \code{FALSE}, overrides the default aesthetics, |
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rather than combining with them. This is most useful for helper functions |
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that define both data and aesthetics and shouldn't inherit behaviour from |
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the default plot specification, e.g. \code{\link[=borders]{borders()}}.} |
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} |
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\description{ |
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Segment reference lines that originate at an point |
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} |
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\examples{ |
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|
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mtcars$name <- rownames(mtcars) |
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|
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p <- ggplot(data = mtcars, aes(x=mpg,y=disp)) + geom_point() |
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|
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p + geom_spikelines(data = mtcars[mtcars$carb==4,],linetype = 2) |
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|
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p + geom_spikelines(data = mtcars[mtcars$carb==4,],aes(colour = factor(gear)), linetype = 2) |
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|
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\dontrun{ |
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require(ggrepel) |
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p + geom_spikelines(data = mtcars[mtcars$carb==4,],aes(colour = factor(gear)), linetype = 2) + |
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ggrepel::geom_label_repel(data = mtcars[mtcars$carb==4,],aes(label = name)) |
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} |
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|
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} |
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