ggpp (version 0.5.8-1)

wrap_labels: Wrap character strings in a vector

Description

Wrap the members of a character vector to a given maximum width by inserting new line characters at word boundaries.

Usage

wrap_labels(x, width = 20, indent = 0, new.line = "\n")

Value

A character vector of the same length as x, with new line characters inserted to wrap text lines longer than width. Names in

x are preserved in the returned value, no names are added if none are present in x.

Arguments

x

character vector, or an object which can be converted to a character vector by as.character.

width

a positive integer giving the target column for wrapping lines in the output.

indent

a positive or negative integer giving the indentation of the first line in a member character string.

new.line

character sting; use "<br>" for HTML encoded strings.

Details

Function wrap_labels() is a wrapper on link{strwrap} that returns a vector of character strings instead of a list of vectors. In addition to wrapping, indentation is supported. Wrapping is always at white space, so width = 0 wraps word by word.

Because the returned value is a character vector of the same length as the input, this function can be used within a call to aes() when mapping a character vector to the label aesthetic, as long as the character strings will not be parsed into R expressions. It can be also used to wrap the strings in a variable stored in a data frame.

Examples

my.text <- c(A = "This is the first string",
             B = "This is the second string, which is longer")

wrap_labels(my.text, width = 20)
wrap_labels(unname(my.text), width = 20)

cat(wrap_labels(my.text, width = 20), sep = "\n--\n")
cat(wrap_labels(my.text, width = 20, indent = 2), sep = "\n--\n")
cat(wrap_labels(my.text, width = 20, indent = -2), sep = "\n--\n")