Going by the list of Scheme functions (2.12 NR B.15, 2.13 NR A.16)
it seems that there are two basic graphical transformations available:
- translation, e.g ly:stencil-translate
- rotation, e.g. ly:stencil-rotate
I feel that these two should be complemented by a third transformation
along the lines of the postscript operator: x y scale.
This could of course be used for zooming, but because you can change
the aspect ratio it is more generally useful, e.g.
- flip
http://lists.gnu.org/archive/html/lilypond-user/2009-08/msg00792.html
- stretch
http://lists.gnu.org/archive/html/lilypond-user/2009-09/msg00271.html
Cheers,
Robin
P.S. Apologies if this already exists.
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