Raphaeljs - Warp printed-text effects like arch, curve and pinch

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I was wondering if there is any library or starting point to understand how to Warp Printed Texts created with RaphaelJS Print method. By "Warp Shape Effects" I mean:

Arch
Curve
Pinch

and by Print-Text I mean: http://raphaeljs.com/reference.html#Paper.print

There is a lot of info about how to apply effects to plain texts using CSS or paths to follow. But for printed paths the mechanic is different. I am a little bit lost.

Thanks in advance!