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scale_*_gradient creates a two colour gradient (low-high),
scale_*_gradient2 creates a diverging colour gradient (low-mid-high),
scale_*_gradientn creates a n-colour gradient.
scale_colour_gradient(..., low = "#132B43", high = "#56B1F7",
space = "Lab", na.value = "grey50", guide = "colourbar",
aesthetics = "colour")scale_fill_gradient(..., low = "#132B43", high = "#56B1F7",
space = "Lab", na.value = "grey50", guide = "colourbar",
aesthetics = "fill")
scale_colour_gradient2(..., low = muted("red"), mid = "white",
high = muted("blue"), midpoint = 0, space = "Lab",
na.value = "grey50", guide = "colourbar", aesthetics = "colour")
scale_fill_gradient2(..., low = muted("red"), mid = "white",
high = muted("blue"), midpoint = 0, space = "Lab",
na.value = "grey50", guide = "colourbar", aesthetics = "fill")
scale_colour_gradientn(..., colours, values = NULL, space = "Lab",
na.value = "grey50", guide = "colourbar", aesthetics = "colour",
colors)
scale_fill_gradientn(..., colours, values = NULL, space = "Lab",
na.value = "grey50", guide = "colourbar", aesthetics = "fill",
colors)
Arguments passed on to continuous_scale
The name of the scale
A palette function that when called with a numeric vector with values between 0 and 1 returns the corresponding values in the range the scale maps to.
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
Used by diverging and n colour gradients
(i.e. scale_colour_gradient2(), scale_colour_gradientn()).
A function used to scale the input values to the range [0, 1].
Function that handles limits outside of the scale limits
(out of bounds). The default replaces out of bounds values with NA.
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().
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.
Colours for low and high ends of the gradient.
colour space in which to calculate gradient. Must be "Lab" - other values are deprecated.
Colour to use for missing values
Type of legend. Use "colourbar" for continuous
colour bar, or "legend" for discrete colour legend.
Character string or vector of character strings listing the
name(s) of the aesthetic(s) that this scale works with. This can be useful, for
example, to apply colour settings to the colour and fill aesthetics at the
same time, via aesthetics = c("colour", "fill").
colour for mid point
The midpoint (in data value) of the diverging scale. Defaults to 0.
Vector of colours to use for n-colour gradient.
if colours should not be evenly positioned along the gradient
this vector gives the position (between 0 and 1) for each colour in the
colours vector. See rescale() for a convenience function
to map an arbitrary range to between 0 and 1.
Default colours are generated with munsell and
mnsl(c("2.5PB 2/4", "2.5PB 7/10")). Generally, for continuous
colour scales you want to keep hue constant, but vary chroma and
luminance. The munsell package makes this easy to do using the
Munsell colour system.
scales::seq_gradient_pal() for details on underlying
palette
Other colour scales: scale_alpha,
scale_colour_brewer,
scale_colour_grey,
scale_colour_hue,
scale_colour_viridis_d
# NOT RUN {
df <- data.frame(
x = runif(100),
y = runif(100),
z1 = rnorm(100),
z2 = abs(rnorm(100))
)
# Default colour scale colours from light blue to dark blue
ggplot(df, aes(x, y)) +
geom_point(aes(colour = z2))
# For diverging colour scales use gradient2
ggplot(df, aes(x, y)) +
geom_point(aes(colour = z1)) +
scale_colour_gradient2()
# Use your own colour scale with gradientn
ggplot(df, aes(x, y)) +
geom_point(aes(colour = z1)) +
scale_colour_gradientn(colours = terrain.colors(10))
# Equivalent fill scales do the same job for the fill aesthetic
ggplot(faithfuld, aes(waiting, eruptions)) +
geom_raster(aes(fill = density)) +
scale_fill_gradientn(colours = terrain.colors(10))
# Adjust colour choices with low and high
ggplot(df, aes(x, y)) +
geom_point(aes(colour = z2)) +
scale_colour_gradient(low = "white", high = "black")
# Avoid red-green colour contrasts because ~10% of men have difficulty
# seeing them
# }
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