This geom is equivalent in functionality to ggforce::geom_circle() and allows for plotting of nodes as circles with a radius scaled by the coordinate system. Because of the geoms reliance on the coordinate system it will only produce true circles when combined with ggplot2::coord_fixed()

geom_node_circle(
mapping = NULL,
data = NULL,
position = "identity",
show.legend = NA,
...
)

## Arguments

mapping Set of aesthetic mappings created by ggplot2::aes() or ggplot2::aes_(). By default x and y are mapped to x0 and y0 in the node 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)). Position adjustment, either as a string, or the result of a call to a position adjustment function. 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. 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.

## Aesthetics

geom_node_circle understand the following aesthetics. Bold aesthetics are automatically set, but can be overridden.

• x0

• y0

• r

• alpha

• colour

• fill

• shape

• size

• stroke

• filter

Other geom_node_*: geom_node_arc_bar(), geom_node_point(), geom_node_range(), geom_node_text(), geom_node_tile(), geom_node_voronoi()
require(tidygraph)
gr <- tbl_graph(flare$vertices, flare$edges)
coord_fixed()