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Re: \offset and mutable properties


From: David Nalesnik
Subject: Re: \offset and mutable properties
Date: Tue, 21 Jul 2015 19:43:48 -0500



On Tue, Jul 21, 2015 at 6:18 PM, Simon Albrecht <address@hidden> wrote:

So a ‘mutable property’ would be one that is unset by default?

My understanding is that immutable properties store default values--such as a procedure to be applied when calculating Stem.thickness or whatever, and immutable properties store the results of calculations for a particular instance of a grob--for example, the value obtained by applying the default procedure to a certain Stem.

These terms are defined here (a bit cryptically I think): http://lilypond.org/doc/v2.19/Documentation/notation/technical-glossary

  You'll note that each of the other properties you offset has a default value in scm/define-grobs.scm
As a side note: I find it confusing that these are not to be found in the IR.

But they are--for example, http://lilypond.org/doc/v2.19/Documentation/internals/dynamiclinespanner is built from the entry in scm/define-grobs.scm.
 
I added issue 4516 <https://code.google.com/p/lilypond/issues/detail?id=4516> for improving \offset and referenced your first suggestions there.


Thanks!

David 


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