Extract coordinates from 'sf' objects (inset-aware)

Reduce spatial data to coordinates in the same way as stat_sf_coordinates(). The result can then be used by geom_sf() or geom_sf_inset() or any geom that needs x and y aesthetics. As this is particularly useful for text, wrappers are provided for geom_text() and geom_label().

Usage

geom_sf_text_inset(
  mapping = aes(),
  data = NULL,
  stat = "sf_coordinates_inset",
  position = "identity",
  ...,
  where = "inset",
  parse = FALSE,
  check_overlap = FALSE,
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  fun.geometry = NULL
)

geom_sf_label_inset(
  mapping = aes(),
  data = NULL,
  stat = "sf_coordinates_inset",
  position = "identity",
  ...,
  where = "inset",
  parse = FALSE,
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  fun.geometry = NULL
)

stat_sf_coordinates_inset(
  mapping = ggplot2::aes(),
  data = NULL,
  geom = "point",
  position = "identity",
  ...,
  inset = NA,
  fun.geometry = NULL,
  where = "inset",
  na.rm = TRUE,
  show.legend = NA,
  inherit.aes = TRUE
)

Arguments

mapping, data, geom, position, na.rm, show.legend, inherit.aes, fun.geometry, ...

See ggplot2::stat_sf_coordinates().

stat, parse, check_overlap

See ggplot2::geom_sf_text().

where

Specifies how the text position interacts with the inset. "inset" means that any points in the inset area are drawn on the inset map, "base" puts them on the base map. This setting is merely a shorthand for setting the position aesthetics to after_stat(x_inset) or after_stat(x) respectively, so will have no effect if these are specified in the mapping.

inset

Inset configuration; see configure_inset(). If NA (the default), this is inherited from the coord (see coord_sf_inset()).

Value

A plot layer

Required aesthetics

geometry

The sf geometry column containing spatial features

Computed variables

x

X dimension of the simple feature

y

Y dimension of the simple feature

x_inset

X dimension of the simple feature after inset transformation

y_inset

Y dimension of the simple feature after inset transformation

inside_inset

logical indicating points inside the inset viewport

inset_scale

1 for points outside the inset, otherwise the configured inset scale parameter

Examples

library(ggplot2)

nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)

ggplot(nc) +
  geom_sf_inset() +
  geom_inset_frame() +
  geom_sf_text(
    aes(x = after_stat(x_inset), y = after_stat(y_inset), label = NAME),
    stat = "sf_coordinates_inset") +
  coord_sf_inset(configure_inset(
    shape_circle(
      centre = sf::st_sfc(sf::st_point(c(-80, 35.5)), crs = 4326),
      radius = 50
    ),
    scale = 1.5, translation = c(-50, -140), units = "mi"
  ))