These geoms are equivalent in functionality to ggplot2::geom_text() and ggplot2::geom_label() and allows for simple annotation of nodes.

geom_node_text(
mapping = NULL,
data = NULL,
position = "identity",
parse = FALSE,
nudge_x = 0,
nudge_y = 0,
check_overlap = FALSE,
show.legend = NA,
repel = FALSE,
...
)

geom_node_label(
mapping = NULL,
data = NULL,
position = "identity",
parse = FALSE,
nudge_x = 0,
nudge_y = 0,
label.r = unit(0.15, "lines"),
label.size = 0.25,
show.legend = NA,
repel = FALSE,
...
)

## Arguments

mapping

Set of aesthetic mappings created by ggplot2::aes() or ggplot2::aes_(). By default x and y are mapped to x and y in the node data.

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

Position adjustment, either as a string, or the result of a call to a position adjustment function. Cannot be jointy specified with nudge_x or nudge_y.

parse

If TRUE, the labels will be parsed into expressions and displayed as described in ?plotmath.

nudge_x, nudge_y

Horizontal and vertical adjustment to nudge labels by. Useful for offsetting text from points, particularly on discrete scales.

check_overlap

If TRUE, text that overlaps previous text in the same layer will not be plotted. check_overlap happens at draw time and in the order of the data. Therefore data should be arranged by the label column before calling geom_text(). Note that this argument is not supported by geom_label().

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.

repel

If TRUE, text labels will be repelled from each other to avoid overlapping, using the GeomTextRepel geom from the ggrepel package.

...

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.

Amount of padding around label. Defaults to 0.25 lines.

label.r

Radius of rounded corners. Defaults to 0.15 lines.

label.size

Size of label border, in mm.

## Aesthetics

geom_node_text understands the following aesthetics. Bold aesthetics are automatically set, but can be overridden. Italic aesthetics are required but not set by default

• x

• y

• label

• alpha

• angle

• colour

• family

• fontface

• hjust

• lineheight

• size

• vjust

Other geom_node_*: geom_node_arc_bar(), geom_node_circle(), geom_node_point(), geom_node_range(), geom_node_tile(), geom_node_voronoi()

## Author

Thomas Lin Pedersen

## Examples

require(tidygraph)
gr <- create_notable('bull') %>%
mutate(class = sample(letters[1:3], n(), replace = TRUE))

ggraph(gr, 'stress') +
geom_node_point(aes(label = class))
#> Warning: Ignoring unknown aesthetics: label

ggraph(gr, 'stress') +
geom_node_label(aes(label = class), repel = TRUE)