2007/10/10, Rune Zedeler <[EMAIL PROTECTED]>:
> void
> Pitch::transpose (Pitch delta)
> {
> Rational new_alter = tone_pitch () + delta.tone_pitch ();
>
> octave_ += delta.octave_;
> notename_ += delta.notename_;
> alteration_ += new_alter - tone_pitch ();
>
> normalize ();
> }
>
> This looks very ineffecient.
>
> Rational new_alter = tone_pitch () + delta.tone_pitch ();
> alteration_ += new_alter - tone_pitch ();
>
> is equivalent to
>
> alteration_ += delta.tone_pitch ();
No it's not. tone_pitch() changes in between since notename_ is changed.
Think about: a major third on B is D#, so alteration is changed by an
amount that is
is not equal to the alteration of E-natural.
--
Han-Wen Nienhuys - [EMAIL PROTECTED] - http://www.xs4all.nl/~hanwen
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