Spatial layout

The "spatial" layout places each node at its own position, as a spatial network records it (see manynet::is_spatial()): in 'x' and 'y' node attributes, or in 'lon' and 'lat' (or 'longitude' and 'latitude'). graphr() uses it by default for a spatial network, such as one read by manynet::read_geojson(). The two axes share one scale, so that a distance drawn is the same whichever way it runs.

Longitudes and latitudes are drawn on an equirectangular projection centred on the network's mean latitude: each longitude is multiplied by the cosine of that latitude, so that a degree of longitude is drawn as long as it is on the ground there. This keeps the shape of a city or a region, though not of a continent.

A node without a position is placed at the centre of those with one.

Usage

layout_spatial(.data, circular = FALSE, times = 1)

layout_tbl_graph_spatial(.data, circular = FALSE, times = 1)

Arguments

.data

Some {manynet} compatible network data.

circular

Should the layout be transformed into a radial representation. Only possible for some layouts. Defaults to FALSE. Required for {ggraph} compatibility.

times

Maximum number of iterations, where appropriate. Required for {ggraph} compatibility, and ignored by the layouts that do not iterate.

Value

Returns a table of nodes' x and y coordinates.

See also

Other mapping: check_layout, completion, layout_concentric(), layout_configuration(), layout_correspondence(), layout_layered(), layout_levels(), layout_matching(), layout_scaling(), layout_valence(), plot_graphr, plot_graphs, plot_grapht

Examples

net <- manynet::create_ring(4) |>
  manynet::mutate_nodes(x = c(0, 1, 1, 0), y = c(0, 0, 1, 1))
graphr(net)