I'm aware of the GlyphTypeface.GetGlyphOutline() in WPF but what I need is to get a center-vector of each glyph, like the lines you draw with a pencil. Is this possible somehow using the existing glyph's of a fontface?
You could take the glyph polygon and produce the so called Straight Skeleton of the polygon.
http://en.wikipedia.org/wiki/Straight_skeleton
For an algorithm, see e.g (Felkel 1998)