draw_key_fields {ggfields} | R Documentation |
Key glyphs for 'radius' 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_fields(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. |
Details
The layer geom_fields()
allows for a special aesthetic radius
. This function
draws a key glyph for this aesthetics, where the radius of the arrow corresponds
with the scalar value listed with this radius. Note that the width of the key glyph
cannot be adjusted by the aesthetic itself. Therefore, if your max_radius
parameter
exceeds the glyph width, you need to change the width of the guides yourself,
see vignette("radius_aes")
for more details.
Value
A grid grob
Author(s)
Pepijn de Vries
Examples
if (requireNamespace("ggplot2")) {
library(ggplot2)
p <- ggplot(economics, aes(date, psavert, color = "savings rate"))
p + geom_line(key_glyph = "fields")
}