[R] Soil texture triangle in R?

[Sander Oom]

Dear R users,

Please find attached a new plot function, plot.soiltexture, to plot soil 
texture data on a triangular plot with an optional backdrop of the USDA 
soil texture classification, written by Jim Lemon and me.

I tried to write the function and documentation confirm the R 
conventions. However, this is a new experience for me, so any comments 
and suggestions are welcome!

I tried to find a suitable package for the plot function, but none are 
obvious.

I have approached Todd Skaggs to ask permission to include sample data 
from the paper:
Skaggs, T.H., L.M. Arya, P.J. Shouse, and B.P. Mohanty. 2001. Estimating 
particle-size distribution from limited soil texture data. Soil Sci. 
Soc. Am. J., 65:1038-1044.
http://soil.scijournals.org/cgi/content/full/65/4/1038

Things still to do:
- rotate axis labels;
- rotate axis tick labels
- provide option to plot ticks inside or outside plot area.

Thus making it look like:
http://soils.usda.gov/technical/manual/images/fig3-16_large.jpg
or
http://soil.scijournals.org/content/vol65/issue4/images/large/1038f2.jpeg

Enjoy,

Sander.
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