Add a watermark image

This functionality depends on the readbitmap package.

watermark_img(filename, x, y, width = 32, location = "br", alpha = 1, ...)

Arguments

filename	the filename of the
x	the x location of the watermark (0-1 scale)
y	the y location of the watermark (0-1 scale)
width	the width of the watermark image (in 'points')
location	one of tr (top right), tl (top left), bl (bottom left), br (bottom right), center (view center)
alpha	transparency value
...	arguments passed to grid::gpar()

Value

a ggplot object