A ggplot2-like theme for Lattice

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Description

A theme for Lattice based on some of the default styles used in the ggplot2 package by Hadley Wickham. Specifically, parts of the functions scale_colour_hue, scale_colour_gradient and theme_gray were copied. Although superficially similar, the implementation here lacks much of the flexibility of the ggplot2 functions: see http://had.co.nz/ggplot2/.

Usage

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ggplot2like(..., n = 6, h = c(0,360) + 15, l = 65, c = 100,
            h.start = 0, direction = 1,
            low = "#3B4FB8", high = "#B71B1A", space = "rgb")

ggplot2like.opts()

axis.grid(side = c("top", "bottom", "left", "right"),
          ..., ticks = c("default", "yes", "no"),
          scales, components, line.col)

Arguments

...

further arguments passed on to simpleTheme to over-ride defaults.

n

number of superpose styles to generate, with equally spaced hues.

h, c, l, h.start, direction

range of hues, starting hue and direction to generate a discrete colour sequence with hcl.

low, high, space

extreme colors to interpolate with colorRampPalette for a continuous color scale.

side, ticks, scales, components, line.col

see axis.default. Typically axis.grid is not called directly so these should not be needed.

Value

ggplot2like() produces a list of settings which can be passed as the par.settings argument to a high-level Lattice plot, or to trellis.par.set. ggplot2like.opts() produces a list which can be passed as the lattice.options argument to a high-level Lattice plot, or to lattice.options.

Author(s)

Felix Andrews felix@nfrac.org; copied and adapted from ggplot2 by Hadley Wickham.

See Also

the ggplot2 package: http://had.co.nz/ggplot2/.

custom.theme, scale.components

Examples

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set.seed(0)

## basic theme does not include white grid lines
xyplot(exp(1:10) ~ 1:10, type = "b", 
    par.settings = ggplot2like())

## add lines for axis ticks with custom axis function
xyplot(exp(1:10) ~ 1:10, type = "b", 
    par.settings = ggplot2like(), axis = axis.grid)
    
## this can be used together with scale.components
## (minor lines only visible on devices supporting translucency)
xyplot(exp(rnorm(500)) ~ rnorm(500),
    scales = list(y = list(log = TRUE)),
    yscale.components = yscale.components.log10ticks,
    par.settings = ggplot2like(), axis = axis.grid)

## ggplotlike.opts() specifies axis = axis.grid as well as
## xscale.components.subticks / yscale.components.subticks

xyg <- make.groups(
    "group one" = rnorm(80, 1),
    "group two" = rnorm(80, 5),
    "group three" = rnorm(80, 2))
xyg$x <- rev(xyg$data)

## group styles: specify number of equi-spaced hues
xyplot(data ~ x, xyg, groups = which, auto.key = TRUE, 
    par.settings = ggplot2like(n = 3),
    lattice.options = ggplot2like.opts()) +
  glayer(panel.smoother(...))

## or set it as the default:
opar <- trellis.par.get()
trellis.par.set(ggplot2like(n = 4, h.start = 180))
oopt <- lattice.options(ggplot2like.opts())

bwplot(voice.part ~ height, data = singer)

histogram(rnorm(100))

barchart(Titanic[,,,"No"], main = "Titanic deaths",
    layout = c(1, 2), auto.key = list(columns = 2))

## reset
trellis.par.set(opar)
lattice.options(oopt)

## axis.grid and scale.components.subticks can be used alone:
## (again, lines for minor ticks need transculency-support to show up)
xyplot(exp(1:10) ~ 1:10, type = "b", 
    lattice.options = ggplot2like.opts(),
    par.settings = list(axis.line = list(col = NA),
        reference.line = list(col = "grey")),
    scales = list(tck = c(0,0)))

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