Methods for Adding a Pixmap Logo to a Plot
This method allows the addition of a re-scaled pixmap to an existing
plot, possibly as a logo, optionally preserving aspect. It may be
used interactively with
locator, and is positioned in the
coordinate system of the plot region. Since the logo is displayed
image, it does not yet seem possible to use the function
outside this region.
addlogo(x, ...) "addlogo"(x, px, py, asp = NULL)
- an object of class
- a vector of two x coordinates, or a list with two named
elements x and y, such as that returned by
- if px is not a list, a vector of two y coordinates
- if omitted or NULL (default), output respects both y coordinates, if a number greater than zero, aspect is preserved in proportion to the difference between x coordinates, multiplied by asp, and only the first y coordinate is respected.
- potentially further arguments passed to and from methods.
x <- read.pnm(system.file("pictures/logo.ppm", package="pixmap")) plot(x) for (i in 1:7) addlogo(x, px=c(0, (101/77)*11), py=c((i-1)*11, i*11), asp=1)