This set of scales defines width scales for edge geoms. Of all the new edge
scales defined in ggraph, this is the only one not having an equivalent in
ggplot2. In essence it mimics the use of size in
`ggplot2::geom_line()`

and related. As almost all edge
representations are lines of some sort, edge_width will be used much more
often than edge_size. It is not necessary to spell out that it is an edge
scale as the geom knows if it is drawing an edge. Just write `width`

and
not `edge_width`

in the call to geoms.

```
scale_edge_width_continuous(
name = waiver(),
breaks = waiver(),
labels = waiver(),
limits = NULL,
range = c(1, 6),
trans = "identity",
guide = "legend"
)
scale_edge_width(
name = waiver(),
breaks = waiver(),
labels = waiver(),
limits = NULL,
range = c(1, 6),
trans = "identity",
guide = "legend"
)
scale_edge_width_discrete(...)
scale_edge_width_binned(
name = waiver(),
breaks = waiver(),
labels = waiver(),
limits = NULL,
range = c(1, 6),
n.breaks = NULL,
nice.breaks = TRUE,
trans = "identity",
guide = "bins"
)
scale_edge_width_manual(..., values, breaks = waiver(), na.value = NA)
scale_edge_width_identity(..., guide = "none")
```

- name
The name of the scale. Used as the axis or legend title. If

`waiver()`

, the default, the name of the scale is taken from the first mapping used for that aesthetic. If`NULL`

, the legend title will be omitted.- breaks
One of:

`NULL`

for no breaks`waiver()`

for the default breaks computed by the transformation objectA numeric vector of positions

A function that takes the limits as input and returns breaks as output (e.g., a function returned by

`scales::extended_breaks()`

). Also accepts rlang lambda function notation.

- labels
One of:

`NULL`

for no labels`waiver()`

for the default labels computed by the transformation objectA character vector giving labels (must be same length as

`breaks`

)An expression vector (must be the same length as breaks). See ?plotmath for details.

A function that takes the breaks as input and returns labels as output. Also accepts rlang lambda function notation.

- limits
One of:

`NULL`

to use the default scale rangeA numeric vector of length two providing limits of the scale. Use

`NA`

to refer to the existing minimum or maximumA function that accepts the existing (automatic) limits and returns new limits. Also accepts rlang lambda function notation. Note that setting limits on positional scales will

**remove**data outside of the limits. If the purpose is to zoom, use the limit argument in the coordinate system (see`coord_cartesian()`

).

- range
a numeric vector of length 2 that specifies the minimum and maximum size of the plotting symbol after transformation.

- trans
- guide
A function used to create a guide or its name. See

`guides()`

for more information.- ...
Arguments passed on to

`continuous_scale`

`minor_breaks`

One of:

`NULL`

for no minor breaks`waiver()`

for the default breaks (one minor break between each major break)A numeric vector of positions

A function that given the limits returns a vector of minor breaks. Also accepts rlang lambda function notation. When the function has two arguments, it will be given the limits and major breaks.

`oob`

One of:

Function that handles limits outside of the scale limits (out of bounds). Also accepts rlang lambda function notation.

The default (

`scales::censor()`

) replaces out of bounds values with`NA`

.`scales::squish()`

for squishing out of bounds values into range.`scales::squish_infinite()`

for squishing infinite values into range.

`na.value`

Missing values will be replaced with this value.

`expand`

For position scales, a vector of range expansion constants used to add some padding around the data to ensure that they are placed some distance away from the axes. Use the convenience function

`expansion()`

to generate the values for the`expand`

argument. The defaults are to expand the scale by 5% on each side for continuous variables, and by 0.6 units on each side for discrete variables.`position`

For position scales, The position of the axis.

`left`

or`right`

for y axes,`top`

or`bottom`

for x axes.`call`

The

`call`

used to construct the scale for reporting messages.`super`

The super class to use for the constructed scale

- n.breaks
An integer guiding the number of major breaks. The algorithm may choose a slightly different number to ensure nice break labels. Will only have an effect if

`breaks = waiver()`

. Use`NULL`

to use the default number of breaks given by the transformation.- nice.breaks
Logical. Should breaks be attempted placed at nice values instead of exactly evenly spaced between the limits. If

`TRUE`

(default) the scale will ask the transformation object to create breaks, and this may result in a different number of breaks than requested. Ignored if breaks are given explicitly.- values
a set of aesthetic values to map data values to. The values will be matched in order (usually alphabetical) with the limits of the scale, or with

`breaks`

if provided. If this is a named vector, then the values will be matched based on the names instead. Data values that don't match will be given`na.value`

.- na.value
The aesthetic value to use for missing (

`NA`

) values

A ggproto object inheriting from `Scale`

Other scale_edge_*:
`scale_edge_alpha()`

,
`scale_edge_colour`

,
`scale_edge_fill`

,
`scale_edge_linetype()`

,
`scale_edge_shape()`

,
`scale_edge_size()`

,
`scale_label_size()`