[R] stacked bar on single-color printing

[John]

Hi,

   I would like to create percentage stacked bar with graphics package
(e.g., ggplot2) and print it in white/black. The regular option is to use
different color on the bar. Is there any way to use different background on
a bar so that we can tell on a black/white printing? For example, let my
green correspond to ***, while my red correspond to ....

   Thanks,

J

	[[alternative HTML version deleted]]