add_axes

Adds axes to the internal region of an OSM plot.

Usage

add_axes(
  map,
  colour = "black",
  pos = c(0.02, 0.03),
  alpha = 0.4,
  fontsize = 3,
  fontface,
  fontfamily,
  ...
)

Arguments

map

A ggplot2 object to which the axes are to be added.

colour

Colour of axis (determines colour of all elements: lines, ticks, and labels).

pos

Positions of axes and labels relative to entire plot device.

alpha

alpha value for semi-transparent background surrounding axes and labels (lower values increase transparency).

fontsize

Size of axis font (in ggplot2 terms; default=3).

fontface

Fontface for axis labels (1:4=plain,bold,italic,bold-italic).

fontfamily

Family of axis font (for example, `Times').

...

Mechanism to allow many parameters to be passed with alternative names (color for colour and xyz for fontxyz.

Value

Modified version of map with axes added.

See also

osm_basemap.

Other map-extra: add_colourbar(), osm_line2poly()

Examples

bbox <- get_bbox (c (-0.13, 51.5, -0.11, 51.52))
map <- osm_basemap (bbox = bbox, bg = "gray20")
map <- add_osm_objects (map, london$dat_BNR, col = "gray40")
map <- add_axes (map)
print (map)


# Map items are added sequentially, so adding axes prior to objects will
# produce a different result.
map <- osm_basemap (bbox = bbox, bg = "gray20")
map <- add_axes (map)
map <- add_osm_objects (map, london$dat_BNR, col = "gray40")
print_osm_map (map)