draw_key {ggtrace}

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.

Usage

draw_key_point_trace(data, params, size)

draw_key_path_trace(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

Examples

p <- ggplot2::ggplot(stocks, ggplot2::aes(day, value, color = name))

# key glyphs can be specified by their name
p + ggplot2::geom_line(key_glyph = "point_trace")

# key glyphs can be specified via their drawing function
p + ggplot2::geom_line(key_glyph = ggplot2::draw_key_rect)