Range-class             Mutable ranges.
abs_area                Point area palette (continuous), with area
                        proportional to value.
alpha                   Modify colour transparency. Vectorised in both
                        colour and alpha.
area_pal                Point area palette (continuous).
as.trans                Convert character string to transformer.
asn_trans               Arc-sin square root transformation.
atanh_trans             Arc-tangent transformation.
boxcox_trans            Box-Cox power transformation.
brewer_pal              Color Brewer palette (discrete).
cbreaks                 Compute breaks for continuous scale.
censor                  Censor any values outside of range.
col2hcl                 Modify standard R colour in hcl colour space.
col_numeric             Color mapping
colour_ramp             Fast color interpolation
comma_format            Comma formatter: format number with commas
                        separating thousands.
cscale                  Continuous scale.
date_breaks             Regularly spaced dates.
date_format             Formatted dates.
date_trans              Transformation for dates (class Date).
dichromat_pal           Dichromat (colour-blind) palette (discrete).
discard                 Discard any values outside of range.
div_gradient_pal        Diverging colour gradient (continous).
dollar_format           Currency formatter: round to nearest cent and
                        display dollar sign.
dscale                  Discrete scale.
exp_trans               Exponential transformation (inverse of log
                        transformation).
expand_range            Expand a range with a multiplicative or
                        additive constant.
extended_breaks         Extended breaks. Uses Wilkinson's extended
                        breaks algorithm as implemented in the
                        'labeling' package.
format_format           Format with using any arguments to 'format'.
gradient_n_pal          Arbitrary colour gradient palette (continous).
grey_pal                Grey scale palette (discrete).
hms_trans               Transformation for times (class hms).
hue_pal                 Hue palette (discrete).
identity_pal            Identity palette.
identity_trans          Identity transformation (do nothing).
linetype_pal            Line type palette (discrete).
log1p_trans             Log plus one transformation.
log_breaks              Log breaks (integer breaks on log-transformed
                        scales).
log_trans               Log transformation.
manual_pal              Manual palette (manual).
math_format             Add arbitrary expression to a label. The symbol
                        that will be replace by the label value is
                        '.x'.
muted                   Mute standard colour.
ordinal_format          Ordinal formatter: add ordinal suffixes (-st,
                        -nd, -rd, -th) to numbers.
package-scales          Generic plot scaling methods
parse_format            Parse a text label to produce expressions for
                        plotmath.
percent_format          Percent formatter: multiply by one hundred and
                        display percent sign.
pretty_breaks           Pretty breaks. Uses default R break algorithm
                        as implemented in 'pretty'.
probability_trans       Probability transformation.
reciprocal_trans        Reciprocal transformation.
rescale                 Rescale numeric vector to have specified
                        minimum and maximum.
rescale_max             Rescale numeric vector to have specified
                        maximum.
rescale_mid             Rescale numeric vector to have specified
                        minimum, midpoint, and maximum.
rescale_none            Don't peform rescaling
rescale_pal             Rescale palette (continuous).
reverse_trans           Reverse transformation.
scientific_format       Scientific formatter.
seq_gradient_pal        Sequential colour gradient palette (continous).
shape_pal               Shape palette (discrete).
show_col                Show colours.
sqrt_trans              Square-root transformation.
squish                  Squish values into range.
squish_infinite         Squish infinite values to range.
time_trans              Transformation for date-times (class POSIXt).
train_continuous        Train (update) a continuous scale
train_discrete          Train (update) a discrete scale
trans_breaks            Pretty breaks on transformed scale.
trans_format            Format labels after transformation.
trans_new               Create a new transformation object.
trans_range             Compute range of transformed values.
unit_format             Add units to the labels
wrap_format             Wrap text to a specified width, adding newlines
                        for spaces if text exceeds the width
zero_range              Determine if range of vector is close to zero,
                        with a specified tolerance
