scale_size scales area, scale_radius scales radius. The size
aesthetic is most commonly used for points and text, and humans perceive
the area of points (not their radius), so this provides for optimal
perception. scale_size_area ensures that a value of 0 is mapped
to a size of 0.
scale_radius(name = waiver(), breaks = waiver(), labels = waiver(),
limits = NULL, range = c(1, 6), trans = "identity",
guide = "legend")scale_size(name = waiver(), breaks = waiver(), labels = waiver(),
limits = NULL, range = c(1, 6), trans = "identity",
guide = "legend")
scale_size_area(..., max_size = 6)
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 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
a numeric vector of length 2 that specifies the minimum and maximum size of the plotting symbol after transformation.
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.
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.
Size of largest points.
scale_size_area() if you want 0 values to be mapped
to points with size 0.
# NOT RUN {
p <- ggplot(mpg, aes(displ, hwy, size = hwy)) +
geom_point()
p
p + scale_size("Highway mpg")
p + scale_size(range = c(0, 10))
# If you want zero value to have zero size, use scale_size_area:
p + scale_size_area()
# This is most useful when size is a count
ggplot(mpg, aes(class, cyl)) +
geom_count() +
scale_size_area()
# If you want to map size to radius (usually bad idea), use scale_radius
p + scale_radius()
# }
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