| Re: [frogs] Chord-name-engraver plus capo - pitches |
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- To: Trevor Daniels <t.daniels@xxxxxxxxxxx>
- Subject: Re: [frogs] Chord-name-engraver plus capo - pitches
- From: Neil Puttock <n.puttock@xxxxxxxxx>
- Date: Fri, 27 Aug 2010 16:00:26 +0100
- Cc: Wols Lists <antlists@xxxxxxxxxxxxxxx>, frogs@xxxxxxxxxxx
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On 27 August 2010 15:15, Trevor Daniels <t.daniels@xxxxxxxxxxx> wrote:
> No, you're right, you can't. I didn't intend to, but I
> did get it wrong. It should be Rational (-capo, 2) I think.
> This should instantiate a Rational with value -capo/2.
You didn't get it wrong. It's perfectly possible to use a double
here, though less efficient; see line 266 in rational.cc.
The only thing to be aware of when transposing pitches is the
limitation on alteration size: pitches can't have alterations larger
than a double, so Pitch (0, 0, Rational (-3/2)) isn't wise; it would
require normalizing (which would produce a B double flat).
Cheers,
Neil
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