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geom-heat-tri.R
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geom-heat-tri.R
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#' Heattriangle
#'
#' The heattriangle geom is used to create the two triangles split by a diagonal
#' line of a rectangle that use luminance to show the values from two sources on
#' the same plot.
#'
#' @param lower The column name for the lower portion of heattriangle.
#' @param lower_name The label name (in quotes) for the legend of the lower
#' rendering. Default is \code{NULL}.
#' @param lower_colors A color vector, usually as hex codes.
#' @param upper The column name for the upper portion of heattriangle.
#' @param upper_name The label name (in quotes) for the legend of the upper
#' rendering. Default is \code{NULL}.
#' @param upper_colors A color vector, usually as hex codes.
#' @param ... \code{...} accepts any arguments \code{scale_fill_gradientn()} has
#' .
#'
#' @import ggplot2
#' @import grid
#' @import ggnewscale
#'
#' @export
#' @return A heattriangle with the main diagonal split by a line within each
#' unit.
#' @examples
#'
#' # heattriangle with categorical variables only
#'
#' library(ggplot2)
#'
#' data <- data.frame(x = rep(c("a", "b", "c"), 3),
#' y = rep(c("d", "e", "f"), 3),
#' lower_values = rep(c(1,5,7),3),
#' upper_values = rep(c(2,3,4),3))
#'
#' ggplot(data, aes(x,y)) +
#' geom_heat_tri(lower = lower_values, upper = upper_values)
#'
#'
#' # heatcircle with numeric variables only
#'
#' data <- data.frame(x = rep(c(1, 2, 3), 3),
#' y = rep(c(1, 2, 3), 3),
#' lower_values = rep(c(1,5,7),3),
#' upper_values = rep(c(2,3,4),3))
#'
#' ggplot(data, aes(x,y)) +
#' geom_heat_tri(lower = lower_values, upper = upper_values)
#'
#'
#' # heatcircle with a mixture of numeric and categorical variables
#'
#' data <- data.frame(x = rep(c("a", "b", "c"), 3),
#' y = rep(c(1, 2, 3), 3),
#' lower_values = rep(c(1,5,7),3),
#' upper_values = rep(c(2,3,4),3))
#'
#' ggplot(data, aes(x,y)) +
#' geom_heat_tri(lower = lower_values, upper = upper_values)
#'
#'
geom_heat_tri <- function(lower,
lower_name = NULL,
lower_colors = c("#FED7D8","#FE8C91", "#F5636B", "#E72D3F","#C20824"),
upper,
upper_name = NULL,
upper_colors = c('gray100', 'gray85', 'gray50', 'gray35', 'gray0'),
...){
if(is.null(lower_name)) {lower_name = rlang::expr({{ lower }})}
if(is.null(upper_name)) {upper_name = rlang::expr({{ upper }})}
list(geom_lower_tri(ggplot2::aes(fill = {{ lower }})),
ggplot2::scale_fill_gradientn(lower_name, colors = lower_colors, ...),
ggnewscale::new_scale_fill(),
geom_upper_tri(ggplot2::aes(fill = {{ upper }})),
ggplot2::scale_fill_gradientn(upper_name, colors = upper_colors, ...))
}
#' @format NULL
#' @usage NULL
GeomTriLowerBase <- ggplot2::ggproto("GeomTriLowerBase", Geom,
default_aes = ggplot2::aes(color = NA, fill = "grey30", size = 0.5, linetype = 1,
alpha = NA),
required_aes = c("xmin", "xmax", "ymin", "ymax"),
draw_panel = function(data, panel_params, coord) {
coords <- coord$transform(data, panel_params)
grid::polygonGrob(
x = c(coords$xmin, coords$xmin, coords$xmax),
y = c(coords$ymin, coords$ymax, coords$ymin),
id = rep(coords$group, times = 3),
gp = gpar(
col = coords$color,
fill = alpha(coords$fill, coords$alpha),
lwd = coords$size * .pt,
lty = coords$linetype
)
)
},
draw_key = ggplot2::draw_key_rect
)
#' @format NULL
#' @usage NULL
GeomTriUpperBase <- ggplot2::ggproto("GeomTriUpperBase", GeomTriLowerBase,
draw_panel = function(data, panel_params, coord) {
coords <- coord$transform(data, panel_params)
grid::polygonGrob(
x = c(coords$xmin, coords$xmax, coords$xmax),
y = c(coords$ymax, coords$ymax, coords$ymin),
id = rep(coords$group, times = 3),
gp = gpar(
col = coords$color,
fill = alpha(coords$fill, coords$alpha),
lwd = coords$size * .pt,
lty = coords$linetype
)
)
}
)
#' @format NULL
#' @usage NULL
GeomLowerTri <- ggplot2::ggproto("GeomLowerTri", GeomTriLowerBase,
extra_params = c("na.rm"),
setup_data = function(data, params) {
data$width <- data$width %||% params$width %||% resolution(data$x, FALSE)
data$height <- data$height %||% params$height %||% resolution(data$y, FALSE)
data <- transform(data,
xmin = x - width / 2, xmax = x + width / 2, width = NULL,
ymin = y - height / 2, ymax = y + height / 2, height = NULL)
if (anyDuplicated(data$group)) {
data$group <- seq_len(nrow(data))
}
data
},
default_aes = ggplot2::aes(fill = "grey20", colour = NA, size = 0.1, linetype = 1,
alpha = NA, width = NA, height = NA),
required_aes = c("x", "y"),
non_missing_aes = c("xmin", "xmax", "ymin", "ymax"),
draw_key = ggplot2::draw_key_rect
)
#' @format NULL
#' @usage NULL
geom_lower_tri <- function(mapping = NULL, data = NULL,
stat = "identity", position = "identity",
...,
linejoin = "mitre",
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE) {
ggplot2::layer(
data = data,
mapping = mapping,
stat = stat,
geom = GeomLowerTri,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list(
na.rm = na.rm,
...
)
)
}
#' @format NULL
#' @usage NULL
GeomUpperTri <- ggplot2::ggproto("GeomUpperTri", GeomTriUpperBase,
extra_params = c("na.rm"),
setup_data = function(data, params) {
data$width <- data$width %||% params$width %||% resolution(data$x, FALSE)
data$height <- data$height %||% params$height %||% resolution(data$y, FALSE)
data <- transform(data,
xmin = x - width / 2, xmax = x + width / 2, width = NULL,
ymin = y - height / 2, ymax = y + height / 2, height = NULL)
if (anyDuplicated(data$group)) {
data$group <- seq_len(nrow(data))
}
data
},
default_aes = ggplot2::aes(fill = "grey20", colour = NA, size = 0.1, linetype = 1,
alpha = NA, width = NA, height = NA),
required_aes = c("x", "y"),
non_missing_aes = c("xmin", "xmax", "ymin", "ymax"),
draw_key = ggplot2::draw_key_rect
)
#' @format NULL
#' @usage NULL
geom_upper_tri <- function(mapping = NULL, data = NULL,
stat = "identity", position = "identity",
...,
linejoin = "mitre",
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE) {
ggplot2::layer(
data = data,
mapping = mapping,
stat = stat,
geom = GeomUpperTri,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list(
na.rm = na.rm,
...
)
)
}