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Arrow annotation layer

annotate_arrow.Rd

This function mirrors annotate() with the following changes. First, the geom argument is pre-populated with "arrow". Second, several parameters from ggarrow are special-cased, because no warning needs to be issued when they don't have length 1.

Usage

annotate_arrow(
  geom = "arrow",
  x = NULL,
  y = NULL,
  xmin = NULL,
  xmax = NULL,
  ymin = NULL,
  ymax = NULL,
  xend = NULL,
  yend = NULL,
  ...,
  na.rm = FALSE
)

Arguments

geom

name of geom to use for annotation

x, y, xmin, ymin, xmax, ymax, xend, yend

Positioning aesthetics. At least one of these must be specified.

...

Other arguments passed on to layer(). These are often aesthetics, used to set an aesthetic to a fixed value, like colour = "red" or size = 3. They may also be parameters to the paired geom/stat.

na.rm

If FALSE, the default, missing values are removed with a warning. If TRUE, missing values are silently removed.

Value

A <Layer> ggproto object that can be added to a plot.

See also

Other arrow geoms: geom_arrow(), geom_arrow_chain(), geom_arrow_curve(), geom_arrow_segment()

Examples

# Annotate an arrow
ggplot() +
  annotate_arrow(
    x = c(0, 1), y = c(0, 1),
    arrow_head = arrow_head_line(),
    arrow_fins = arrow_fins_line(),
    length_head = unit(5, "mm"),
    length_fins = unit(5, "mm")
  )


# Still works with other geoms as well
ggplot(mtcars, aes(x = wt, y = mpg)) + geom_point() +
  annotate_arrow("text", x = 4, y = 25, label = "Some text")