I think this is because these are texts that are attached to multimeasure rests. The multi measure rest is the Y parent of the text. IIRC, the texts are implemented as spanners, so their X parent would be the left bound of the text spanner.
On Tue, Apr 2, 2013 at 10:55 PM, Janek Warchoł <janek.lilyp...@gmail.com>wrote: > Hi, > > In scm/define-grobs.scm we can see that the following grobs: > MultiMeasureRestNumber > MultiMeasureRestText > PercentRepeatCounter > DoublePercentRepeatCounter > have their X-offsets initialized to a sum of return values from two > functions: x-aligned-on-self and x-centered-on-y-parent. Now, the > x-aligned-on-self is quite clear, but i'm puzzled by > x-centered-on-y-parent: why would we derive grob's horizontal position > from its *vertical* parent?? Isn't it the job of horizontal parent to > be the base for horizontal position? In other words, if > MultiMeasureRestNumber's Y-parent (which is a MultiMeasureRest) should > be the basis for MultiMeasureRestNumber's X-placement, then maybe we > should simply set MultiMeasureRestNumber's X-parent to be that > MultiMeasureRest? > > I tried git archeology to learn about the motivation of this design, > but i didn't get anything meaningful - the only thing i know is that > Han-Wen wrote that code ;) so i'm ccing him. > > I did some testing and it seems that my idea is correct (i.e. we > should just set appropriate X-parent and use that for alignment), but > i don't know how to set that parent - the obvious way failed... Check > out attached patch, and the testfile. Ideas? > > cheers, > Janek > -- Han-Wen Nienhuys - han...@xs4all.nl - http://www.xs4all.nl/~hanwen
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