aes_linetype_size_shape {ggplot2} | R Documentation

## Differentiation related aesthetics: linetype, size, shape

### Description

This page demonstrates the usage of a sub-group of aesthetics; linetype, size and shape.

### Examples

    # Line types should be specified with either an integer, a name, or with a string of
    # an even number (up to eight) of hexadecimal digits which give the lengths in
    # consecutive positions in the string.
    # 0 = blank, 1 = solid, 2 = dashed, 3 = dotted, 4 = dotdash, 5 = longdash, 6 = twodash

    # Data
    df <- data.frame(x = 1:10 , y = 1:10)
    f <- ggplot(df, aes(x, y))
    f + geom_line(linetype = 2)
    f + geom_line(linetype = "dotdash")

    # 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.
    f + geom_line(linetype = "3313")

    # Mapping line type from a variable
    ggplot(economics_long, aes(date, value01)) +
      geom_line(aes(linetype = variable))

    # Size examples
    # Should be specified with a numerical value (in millimetres),
    # or from a variable source
    p <- ggplot(mtcars, aes(wt, mpg))
    p + geom_point(size = 4)
    p + geom_point(aes(size = qsec))
    p + geom_point(size = 2.5) +
      geom_hline(yintercept = 25, size = 3.5)

    # Shape examples
    # Shape takes four types of values: an integer in [0, 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
    p + geom_point()
    p + geom_point(shape = 5)
    p + geom_point(shape = "k", size = 3)
    p + geom_point(shape = ".")
    p + geom_point(shape = NA)

    # Shape can also be mapped from a variable
    p + geom_point(aes(shape = factor(cyl)))

    # A look at all 25 symbols
    df2 <- data.frame(x = 1:5 , y = 1:25, z = 1:25)
    s <- ggplot(df2, aes(x, y))
    s + 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)
    s + geom_point(aes(shape = z), size = 4, colour = "Red") +
      scale_shape_identity()
    s + geom_point(aes(shape = z), size = 4, colour = "Red", fill = "Black") +
      scale_shape_identity()

[Package ggplot2 version 2.1.0 Index]