R/aes-linetype-size-shape.r
aes_linetype_size_shape.Rd
The linetype
, size
, and shape
aesthetics modify the appearance of
lines and/or points. They also apply to the outlines of polygons (linetype
and size
) or to text (size
).
The linetype
aesthetic can be specified with either an integer (0-6), a
name (0 = blank, 1 = solid, 2 = dashed, 3 = dotted, 4 = dotdash, 5 = longdash,
6 = twodash), a mapping to a discrete variable, or a string of an even number
(up to eight) of hexadecimal digits which give the lengths in consecutive
positions in the string. See examples for a hex string demonstration.
The size
aesthetic can be specified with a numerical value (in millimetres)
or via a mapping to a continuous variable.
The shape
aesthetic can be specified with an integer (between 0 and 25),
a single character (which uses that character as the plotting symbol),
a .
to draw the smallest rectangle that is visible (i.e., about one pixel),
an NA
to draw nothing, or a mapping to a discrete variable. Symbols and
filled shapes are described in the examples below.
geom_line()
and geom_point()
for geoms commonly used
with these aesthetics.
aes_group_order()
for using linetype
, size
, or
shape
for grouping.
Run vignette("ggplot2-specs")
to see an overview of other aesthestics that
can be modified.
# An example with hex strings; the string "33" specifies three units on followed # by three off and "3313" specifies three units on followed by three off followed # by one on and finally three off. p + geom_line(linetype = "3313")# Mapping line type from a grouping variable ggplot(economics_long, aes(date, value01)) + geom_line(aes(linetype = variable))#> Warning: Removed 32 rows containing missing values (geom_point).# A look at all 25 symbols df2 <- data.frame(x = 1:5 , y = 1:25, z = 1:25) p <- ggplot(df2, aes(x, y)) p + geom_point(aes(shape = z), size = 4) + scale_shape_identity()# While all symbols have a foreground colour, symbols 19-25 also take a # background colour (fill) p + geom_point(aes(shape = z), size = 4, colour = "Red") + scale_shape_identity()