geom_leg: Single line segments with rounded ends
In ggmap: Spatial Visualization with ggplot2

geom_leg

R Documentation

Single line segments with rounded ends

Description

This is ggplot2's segment with rounded ends. It's mainly included in ggmap for historical reasons.

Usage

geom_leg(
  mapping = NULL,
  data = NULL,
  stat = "identity",
  position = "identity",
  arrow = NULL,
  lineend = "round",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  ...
)

Arguments

`mapping`	Set of aesthetic mappings created by `aes()`. If specified and `inherit.aes = TRUE` (the default), it is combined with the default mapping at the top level of the plot. You must supply `mapping` if there is no plot mapping.
`data`	The data to be displayed in this layer. There are three options: If `NULL`, the default, the data is inherited from the plot data as specified in the call to `ggplot()`. A `data.frame`, or other object, will override the plot data. All objects will be fortified to produce a data frame. See `fortify()` for which variables will be created. A `function` will be called with a single argument, the plot data. The return value must be a `data.frame`, and will be used as the layer data. A `function` can be created from a `formula` (e.g. `~ head(.x, 10)`).
`stat`	The statistical transformation to use on the data for this layer, either as a `ggproto` `Geom` subclass or as a string naming the stat stripped of the `stat_` prefix (e.g. `"count"` rather than `"stat_count"`)
`position`	Position adjustment, either as a string naming the adjustment (e.g. `"jitter"` to use `position_jitter`), or the result of a call to a position adjustment function. Use the latter if you need to change the settings of the adjustment.
`arrow`	specification for arrow heads, as created by `grid::arrow()`.
`lineend`	Line end style (round, butt, square).
`na.rm`	If `FALSE`, the default, missing values are removed with a warning. If `TRUE`, missing values are silently removed.
`show.legend`	logical. Should this layer be included in the legends? `NA`, the default, includes if any aesthetics are mapped. `FALSE` never includes, and `TRUE` always includes. It can also be a named logical vector to finely select the aesthetics to display.
`inherit.aes`	If `FALSE`, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. `borders()`.
`...`	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.

Details

only intended for use in ggmap package. only designed for mercator projection.

Examples


## Not run:  # removed for R CMD check speed

map <- get_map(
  location = c(-77.0425, 38.8925), # painfully picked by hand
  source = "google", zoom = 14, maptype = "satellite"
)
ggmap(map)


(legs_df <- route(
  "the white house, dc",
  "lincoln memorial washington dc",
  alternatives = TRUE
))

ggplot(data = legs_df) +
  geom_leg(aes(
    x = start_lon, xend = end_lon,
    y = start_lat, yend = end_lat
  )) +
  coord_map()

ggplot(data = legs_df) +
  geom_leg(aes(
    x = start_lon, xend = end_lon,
    y = start_lat, yend = end_lat,
    color = route
  )) +
  coord_map()


ggmap(map) +
  geom_leg(
    aes(
      x = start_lon, xend = end_lon,
      y = start_lat, yend = end_lat
    ),
    data = legs_df, color = "red"
  )

# adding a color aesthetic errors because of a base-layer problem
# ggmap(map) +
#   geom_leg(
#     aes(
#       x = start_lon, xend = end_lon,
#       y = start_lat, yend = end_lat,
#       color = route
#   )
# )


# this is probably the easiest hack to fix it
ggplot(data = legs_df) +
  inset_ggmap(map) +
  geom_leg(
    aes(
      x = start_lon, xend = end_lon,
      y = start_lat, yend = end_lat,
      color = route
    ),
    data = legs_df
  ) +
  coord_map()


## End(Not run)

ggmap documentation built on Nov. 19, 2023, 9:06 a.m.