Import a Cairo SVG image
This function reads in an SVG image file and creates a
"Picture" object.
readPicture(file, warn = TRUE, initDefs = TRUE)
file |
The filename of a Cairo SVG image. |
warn |
Logical. If |
initDefs |
Logical. If |
This function is designed to read SVG files that have been generated by the Cairo graphics system.
There are several ways to generate Cairo SVG files: The R SVG
graphics device, provided by the svg function,
produces Cairo SVG; the grConvert package (Linux-only) can convert
PostScript, or PDF, or SVG files to Cairo SVG; and the
rsvg package can convert many different graphics formats to
Cairo SVG.
It is very unlikely that an SVG file that was NOT generated by Cairo
will import properly. This function may read the file without error,
but the render (via grid.picture) is very unlikely
to faithfully reproduce the original image.
An object of class "Picture".
Simon Potter
The Cairo graphics library, https://cairographics.org/
options(warn=1)
## NOT a Cairo SVG file
badfile <- system.file("SVG", "lwd.svg", package="grImport2")
## A Cairo SVG file
goodfile <- system.file("SVG", "lwd-rsvg.svg", package="grImport2")
## Warning because NOT a Cairo SVG file
## (and it will not render correctly)
img <- readPicture(badfile)
## No warning
## (and it will render correctly)
img <- readPicture(goodfile)
if (require("rsvg")) {
## Generate a Cairo SVG file
goodfile <- tempfile(fileext = ".svg")
rsvg_svg(badfile, goodfile)
## No warning
## (and it will render correctly)
img <- readPicture(goodfile)
}
options(warn=0)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.