@article{JSSv030i04,
title={Importing Vector Graphics: The grImport Package for R},
volume={30},
url={https://www.jstatsoft.org/index.php/jss/article/view/v030i04},
doi={10.18637/jss.v030.i04},
abstract={This article describes an approach to importing vector-based graphical images into statistical software as implemented in a package called grImport for the R statistical computing environment. This approach assumes that an original image can be transformed into a PostScript format (i.e., the original image is in a standard vector graphics format such as PostScript, PDF, or SVG). The grImport package consists of three components: a function for converting PostScript files to an R-specific XML format; a function for reading the XML format into special Picture objects in R; and functions for manipulating and drawing Picture objects. Several examples and applications are presented, including annotating a statistical plot with an imported logo and using imported images as plotting symbols.},
number={4},
journal={Journal of Statistical Software},
author={Murrell, Paul},
year={2009},
pages={1–37}
}