Re: Fixes note column skylines by adding stem tremolo to axis group. (issue4754054)

[address@hidden]

On Jul 18, 2011, at 9:53 PM, address@hidden wrote:

> Even simpler: remove the Y-extent default, add Stem_tremolo::pure_height
> and an entry in pure-print-to-height-conversions (since
> ly:grob::stencil-height is the same as getting the non-pure extent from
> the translated stencil).
> 
> http://codereview.appspot.com/4754054/
> 

Hey Neil,

After making several round-trips around the source this morning, I can't put 
off composition any longer, but I fear that all I will compose today are songs 
about the Axis_group_interface if I don't understand how this works.
I believe that line 80 of note-spacing.cc is where the two skylines for the two 
note columns are calculated.  How, by adding a pure-height to the Stem_tremolo, 
does the Stem_tremolo make its way into this skyline?  And, if it doesn't make 
its way into this skyline, how is it taken into account during horizontal 
spacing?

Sorry for the many questions - usually I can grok these things on my own, but 
this is proving to be elusive (as are all things having to do with `pure' in 
LilyPond, which I understand in only the most fleeting and obtuse way).

Cheers,
MS