watermark: Add a watermark to an existing plot

In JosephCrispell/plotteR: A collection of functions to help with base R plotting

Description

This function should be run following a plot. It will add a transparent text label to act as a watermark.

Usage

watermark(
  text,
  location = NULL,
  x = NULL,
  y = NULL,
  col = "black",
  alpha = 0.5,
  srt = 45,
  cex = 1,
  ...
)

Arguments

text	a character vector specifying the text to be written
location	an optional character vector specifying the location for the text to be plotted
x	optional x co-ordinate to be used to position the text
y	optional y co-ordinate to be used to position the text
col	the colour of the text to be plotted. Defaults to black.
alpha	the transparency (0=translucent and 1=opaque) of the text to be plotted. Defaults to 0.5.
srt	the number of degrees from horizontal to set the angle of the text
cex	numeric character expansion factor. By default, text will be stretched to fit plotting window.
...	additional arguments to be passed to the text() function

Examples

# Generate some example data
x <- runif(10000)
y <- runif(10000)

# Plot the points
plot(x, y, las=1, bty="n", pch=19, col=rgb(0,0,0, 0.1))

# Add a watermark
watermark("CONFIDENTIAL", col="red")

JosephCrispell/plotteR documentation built on June 6, 2021, 7:24 p.m.