draw_key_sankeyedge {ggsankeyfier}

Key glyphs for legends

Description

Each geom has an associated function that draws the key when the geom needs to be displayed in a legend. These functions are called ⁠draw_key_*()⁠, where * stands for the name of the respective key glyph. The key glyphs can be customized for individual geoms by providing a geom with the key_glyph argument (see layer() or examples below.)

Usage

draw_key_sankeyedge(data, params, size)

draw_key_sankeynode(data, params, size)

Arguments

data

A single row data frame containing the scaled aesthetics to display in this key

params

A list of additional parameters supplied to the geom.

size

Width and height of key in mm.

Value

A grid grob.

Author(s)

Pepijn de Vries

Examples

## The key glyph for sankey diagrams can be applied to different geoms as well.
## In the example below it is applied to a histogram

library(ggplot2)
ggplot(data.frame(x = rnorm(100), groups = rep(letters[1:2], 2)),
       aes(x = x, fill = groups)) +
  geom_histogram(key_glyph = draw_key_sankeyedge, binwidth = 0.2, alpha = 1)
ggplot(data.frame(x = rnorm(100), groups = rep(letters[1:2], 2)),
       aes(x = x, fill = groups)) +
  geom_histogram(key_glyph = draw_key_sankeynode, binwidth = 0.2)