Skip to content
This repository
Fetching contributors…

Cannot retrieve contributors at this time

file 270 lines (240 sloc) 10.653 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270
\name{theme}
\alias{theme}
\title{Set theme elements}
\usage{
  theme(..., complete = FALSE)
}
\arguments{
  \item{...}{a list of element name, element pairings that
  modify the existing theme.}

  \item{complete}{set this to TRUE if this is a complete
  theme, such as the one returned \code{by theme_grey()}.
  Complete themes behave differently when added to a ggplot
  object.}
}
\description{
  Use this function to modify theme settings.
}
\details{
  Theme elements can inherit properties from other theme
  elements. For example, \code{axis.title.x} inherits from
  \code{axis.title}, which in turn inherits from
  \code{text}. All text elements inherit directly or
  indirectly from \code{text}; all lines inherit from
  \code{line}, and all rectangular objects inherit from
  \code{rect}.

  For more examples of modifying properties using
  inheritance, see \code{\link{+.gg}} and
  \code{\link{\%+replace\%}}.

  To see a graphical representation of the inheritance
  tree, see the last example below.
}
\section{Theme elements}{
  The individual theme elements are:

  \tabular{ll}{ line \tab all line elements
  (\code{element_line}) \cr rect \tab all rectangluar
  elements (\code{element_rect}) \cr text \tab all text
  elements (\code{element_text}) \cr title \tab all title
  elements: plot, axes, legends (\code{element_text};
  inherits from \code{text}) \cr

  axis.title \tab label of axes (\code{element_text};
  inherits from \code{text}) \cr axis.title.x \tab x axis
  label (\code{element_text}; inherits from
  \code{axis.title}) \cr axis.title.y \tab y axis label
  (\code{element_text}; inherits from \code{axis.title})
  \cr axis.text \tab tick labels along axes
  (\code{element_text}; inherits from \code{text}) \cr
  axis.text.x \tab x axis tick labels (\code{element_text};
  inherits from \code{axis.text}) \cr axis.text.y \tab y
  axis tick labels (\code{element_text}; inherits from
  \code{axis.text}) \cr axis.ticks \tab tick marks along
  axes (\code{element_line}; inherits from \code{line}) \cr
  axis.ticks.x \tab x axis tick marks (\code{element_line};
  inherits from \code{axis.ticks}) \cr axis.ticks.y \tab y
  axis tick marks (\code{element_line}; inherits from
  \code{axis.ticks}) \cr axis.ticks.length \tab length of
  tick marks (\code{unit}) \cr axis.ticks.margin \tab space
  between tick mark and tick label (\code{unit}) \cr
  axis.line \tab lines along axes (\code{element_line};
  inherits from \code{line}) \cr axis.line.x \tab line
  along x axis (\code{element_line}; inherits from
  \code{axis.line}) \cr axis.line.y \tab line along y axis
  (\code{element_line}; inherits from \code{axis.line}) \cr

  legend.background \tab background of legend
  (\code{element_rect}; inherits from \code{rect}) \cr
  legend.margin \tab extra space added around legend
  (\code{unit}) \cr legend.key \tab background underneath
  legend keys (\code{element_rect}; inherits from
  \code{rect}) \cr legend.key.size \tab size of legend keys
  (\code{unit}; inherits from \code{legend.key.size}) \cr
  legend.key.height \tab key background height
  (\code{unit}; inherits from \code{legend.key.size}) \cr
  legend.key.width \tab key background width (\code{unit};
  inherits from \code{legend.key.size}) \cr legend.text
  \tab legend item labels (\code{element_text}; inherits
  from \code{text}) \cr legend.text.align \tab alignment of
  legend labels (number from 0 (left) to 1 (right)) \cr
  legend.title \tab title of legend (\code{element_text};
  inherits from \code{title}) \cr legend.title.align \tab
  alignment of legend title (number from 0 (left) to 1
  (right)) \cr legend.position \tab the position of
  legends. ("left", "right", "bottom", "top", or
  two-element numeric vector) \cr legend.direction \tab
  layout of items in legends ("horizontal" or "vertical")
  \cr legend.justification \tab anchor point for
  positioning legend inside plot ("center" or two-element
  numeric vector) \cr legend.box \tab arrangement of
  multiple legends ("horizontal" or "vertical") \cr

  panel.background \tab background of plotting area, drawn
  underneath plot (\code{element_rect}; inherits from
  \code{rect}) \cr panel.border \tab border around plotting
  area, drawn on top of plot so that it covers tick marks
  and grid lines. This should be used with \code{fill=NA}
  (\code{element_rect}; inherits from \code{rect}) \cr
  panel.margin \tab margin around facet panels
  (\code{unit}) \cr panel.grid \tab grid lines
  (\code{element_line}; inherits from \code{line}) \cr
  panel.grid.major \tab major grid lines
  (\code{element_line}; inherits from \code{panel.grid})
  \cr panel.grid.minor \tab minor grid lines
  (\code{element_line}; inherits from \code{panel.grid})
  \cr panel.grid.major.x \tab vertical major grid lines
  (\code{element_line}; inherits from
  \code{panel.grid.major}) \cr panel.grid.major.y \tab
  horizontal major grid lines (\code{element_line};
  inherits from \code{panel.grid.major}) \cr
  panel.grid.minor.x \tab vertical minor grid lines
  (\code{element_line}; inherits from
  \code{panel.grid.minor}) \cr panel.grid.minor.y \tab
  horizontal minor grid lines (\code{element_line};
  inherits from \code{panel.grid.minor}) \cr

  plot.background \tab background of the entire plot
  (\code{element_rect}; inherits from \code{rect}) \cr
  plot.title \tab plot title (text appearance)
  (\code{element_text}; inherits from \code{title}) \cr
  plot.margin \tab margin around entire plot (\code{unit})
  \cr

  strip.background \tab background of facet labels
  (\code{element_rect}; inherits from \code{rect}) \cr
  strip.text \tab facet labels (\code{element_text};
  inherits from \code{text}) \cr strip.text.x \tab facet
  labels along horizontal direction (\code{element_text};
  inherits from \code{strip.text}) \cr strip.text.y \tab
  facet labels along vertical direction
  (\code{element_text}; inherits from \code{strip.text})
  \cr }
}
\examples{
\donttest{
p <- qplot(mpg, wt, data = mtcars)
p
p + theme(panel.background = element_rect(colour = "pink"))
p + theme_bw()

# Scatter plot of gas mileage by vehicle weight
p <- ggplot(mtcars, aes(x = wt, y = mpg)) + geom_point()
# Calculate slope and intercept of line of best fit
coef(lm(mpg ~ wt, data = mtcars))
p + geom_abline(intercept = 37, slope = -5)
# Calculate correlation coefficient
with(mtcars, cor(wt, mpg, use = "everything", method = "pearson"))
#annotate the plot
p + geom_abline(intercept = 37, slope = -5) +
geom_text(data = data.frame(), aes(4.5, 30, label = "Pearson-R = -.87"))

# Change the axis labels
# Original plot
p
p + xlab("Vehicle Weight") + ylab("Miles per Gallon")
# Or
p + labs(x = "Vehicle Weight", y = "Miles per Gallon")

# Change title appearance
p <- p + labs(title = "Vehicle Weight-Gas Mileage Relationship")
# Set title to twice the base font size
p + theme(plot.title = element_text(size = rel(2)))
p + theme(plot.title = element_text(size = rel(2), colour = "blue"))

# Changing plot look with themes
DF <- data.frame(x = rnorm(400))
m <- ggplot(DF, aes(x = x)) + geom_histogram()
# Default is theme_grey()
m
# Compare with
m + theme_bw()

# Manipulate Axis Attributes
library(grid) # for unit
m + theme(axis.line = element_line(size = 3, colour = "red", linetype = "dotted"))
m + theme(axis.text = element_text(colour = "blue"))
m + theme(axis.text.y = element_blank())
m + theme(axis.ticks = element_line(size = 2))
m + theme(axis.title.y = element_text(size = rel(1.5), angle = 90))
m + theme(axis.title.x = element_blank())
m + theme(axis.ticks.length = unit(.85, "cm"))

# Legend Attributes
z <- ggplot(mtcars, aes(wt, mpg, colour = factor(cyl))) + geom_point()
z
z + theme(legend.position = "none")
z + theme(legend.position = "bottom")
# Or use relative coordinates between 0 and 1
z + theme(legend.position = c(.5, .5))
z + theme(legend.background = element_rect(colour = "black"))
# Legend margin controls extra space around outside of legend:
z + theme(legend.background = element_rect(), legend.margin = unit(1, "cm"))
z + theme(legend.background = element_rect(), legend.margin = unit(0, "cm"))
# Or to just the keys
z + theme(legend.key = element_rect(colour = "black"))
z + theme(legend.key = element_rect(fill = "yellow"))
z + theme(legend.key.size = unit(2.5, "cm"))
z + theme(legend.text = element_text(size = 20, colour = "red", angle = 45))
z + theme(legend.title = element_text(face = "italic"))

# To change the title of the legend use the name argument
# in one of the scale options
z + scale_colour_brewer(name = "My Legend")
z + scale_colour_grey(name = "Number of \\nCylinders")

# Panel and Plot Attributes
z + theme(panel.background = element_rect(fill = "black"))
z + theme(panel.border = element_rect(linetype = "dashed", colour = "black"))
z + theme(panel.grid.major = element_line(colour = "blue"))
z + theme(panel.grid.minor = element_line(colour = "red", linetype = "dotted"))
z + theme(panel.grid.major = element_line(size = 2))
z + theme(panel.grid.major.y = element_blank(), panel.grid.minor.y = element_blank())
z + theme(plot.background = element_rect())
z + theme(plot.background = element_rect(fill = "green"))

# Faceting Attributes
set.seed(4940)
dsmall <- diamonds[sample(nrow(diamonds), 1000), ]
k <- ggplot(dsmall, aes(carat, ..density..)) + geom_histogram(binwidth = 0.2) +
facet_grid(. ~ cut)
k + theme(strip.background = element_rect(colour = "purple", fill = "pink",
                                          size = 3, linetype = "dashed"))
k + theme(strip.text.x = element_text(colour = "red", angle = 45, size = 10,
                                      hjust = 0.5, vjust = 0.5))
k + theme(panel.margin = unit(5, "lines"))
k + theme(panel.margin = unit(0, "lines"))


# Modify a theme and save it
mytheme <- theme_grey() + theme(plot.title = element_text(colour = "red"))
p + mytheme


## Run this to generate a graph of the element inheritance tree
build_element_graph <- function(tree) {
  require(igraph)
  require(plyr)

  inheritdf <- function(name, item) {
    if (length(item$inherit) == 0)
      data.frame()
    else
      data.frame(child = name, parent = item$inherit)
  }

  edges <- rbind.fill(mapply(inheritdf, names(tree), tree))

  # Explicitly add vertices (since not all are in edge list)
  vertices <- data.frame(name = names(tree))
  graph.data.frame(edges, vertices = vertices)
}

g <- build_element_graph(ggplot2:::.element_tree)
V(g)$label <- V(g)$name

set.seed(324)
par(mar=c(0,0,0,0)) # Remove unnecessary margins
plot(g, layout=layout.fruchterman.reingold, vertex.size=4, vertex.label.dist=.25)

}
}
\seealso{
  \code{\link{+.gg}}

  \code{\link{\%+replace\%}}

  \code{\link{rel}}
}
Something went wrong with that request. Please try again.