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(..., range = c(1, 6))

scale_edge_width(..., range = c(1, 6))

scale_edge_width_discrete(..., range = c(2, 6))

scale_edge_width_manual(..., values)

scale_edge_width_identity(..., guide = "none")



Arguments passed on to continuous_scale


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.


One of:

  • NULL for no breaks

  • waiver() for the default breaks computed by the transformation object

  • A numeric vector of positions

  • A function that takes the limits as input and returns breaks as output


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.


One of:

  • NULL for no labels

  • waiver() for the default labels computed by the transformation object

  • A character vector giving labels (must be same length as breaks)

  • A function that takes the breaks as input and returns labels as output


One of:

  • NULL to use the default scale range

  • A numeric vector of length two providing limits of the scale. Use NA to refer to the existing minimum or maximum

  • A function that accepts the existing (automatic) limits and returns new limits


Function that handles limits outside of the scale limits (out of bounds). The default replaces out of bounds values with NA.


Missing values will be replaced with this value.


Either the name of a transformation object, or the object itself. Built-in transformations include "asn", "atanh", "boxcox", "date", "exp", "hms", "identity", "log", "log10", "log1p", "log2", "logit", "modulus", "probability", "probit", "pseudo_log", "reciprocal", "reverse", "sqrt" and "time".A transformation object bundles together a transform, its inverse, and methods for generating breaks and labels. Transformation objects are defined in the scales package, and are called name_trans, e.g. scales::boxcox_trans(). You can create your own transformation with scales::trans_new().


A function used to create a guide or its name. See guides() for more info.


The position of the axis. "left" or "right" for vertical scales, "top" or "bottom" for horizontal scales


The super class to use for the constructed scale


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 expand_scale() 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.


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


a set of aesthetic values to map data values to. If this is a named vector, then the values will be matched based on the names. If unnamed, values will be matched in order (usually alphabetical) with the limits of the scale. Any data values that don't match will be given na.value.


A function used to create a guide or its name. See guides() for more info.


A ggproto object inheriting from Scale

See also