scale_hue: Qualitative colour scale with evenly spaced hues.

In eddelbuettel/lwplot: An Lighter-Weight Implementation of Leland Wilkinson's Grammar of Graphics

Qualitative colour scale with evenly spaced hues.

Description

Qualitative colour scale with evenly spaced hues.

Usage

scale_colour_hue(..., h = c(0, 360) + 15, c = 100, l = 65,
  h.start = 0, direction = 1, na.value = "grey50")

scale_fill_hue(..., h = c(0, 360) + 15, c = 100, l = 65,
  h.start = 0, direction = 1, na.value = "grey50")

Arguments

...	Other arguments passed on to discrete_scale to control name, limits, breaks, labels and so forth.
h	range of hues to use, in [0, 360]
c	chroma (intensity of colour), maximum value varies depending on combination of hue and luminance.
l	luminance (lightness), in [0, 100]
h.start	hue to start at
direction	direction to travel around the colour wheel, 1 = clockwise, -1 = counter-clockwise
na.value	Colour to use for missing values

See Also

Other colour scales: scale_colour_brewer, scale_colour_gradient, scale_colour_grey

Examples

dsamp <- diamonds[sample(nrow(diamonds), 1000), ]
(d <- ggplot(dsamp, aes(carat, price)) + geom_point(aes(colour = clarity)))

# Change scale label
d + scale_colour_hue()
d + scale_colour_hue("clarity")
d + scale_colour_hue(expression(clarity[beta]))

# Adjust luminosity and chroma
d + scale_colour_hue(l=40, c=30)
d + scale_colour_hue(l=70, c=30)
d + scale_colour_hue(l=70, c=150)
d + scale_colour_hue(l=80, c=150)

# Change range of hues used
d + scale_colour_hue(h=c(0, 90))
d + scale_colour_hue(h=c(90, 180))
d + scale_colour_hue(h=c(180, 270))
d + scale_colour_hue(h=c(270, 360))

# Vary opacity
# (only works with pdf, quartz and cairo devices)
d <- ggplot(dsamp, aes(carat, price, colour = clarity))
d + geom_point(alpha = 0.9)
d + geom_point(alpha = 0.5)
d + geom_point(alpha = 0.2)

# Colour of missing values is controlled with na.value:
miss <- factor(sample(c(NA, 1:5), nrow(mtcars), replace = TRUE))
ggplot(mtcars, aes(mpg, wt)) + geom_point(aes(colour = miss))
ggplot(mtcars, aes(mpg, wt)) +
  geom_point(aes(colour = miss)) +
  scale_colour_hue(na.value = "black")

eddelbuettel/lwplot documentation built on July 11, 2024, 1:24 p.m.