How do I plot vertical text??

[jonathon]

I am working on a GNUstep charting tool, and I need to label the
Y-axis with vertical text.

Since I cannot seem to plot text vertically directly, is there a
different way to do this?  It seems I should be able to plot text
using glyphs with a BezierPath, but glyphs seem to be the most poorly
documented concept yet in the Cocoa docs or anywhere else.

So, can I take a NSString, plot it with NSGlyphs, append the glyphs to
a bezier path, and then use an affine transform to rotate it 90
degrees vertically?

jonathon