tcp1 and tcp2 were created to avoid loss of information when switching back
and forth between transposed pitch and concert pitch (e.g. C-flat should
stay as a C-flat instead of simplifying to a B-natural).
In case it is helpful to know the history, the following comment lists
several of the issues:
http://musescore.org/en/node/3587#comment-16287
On Wed, Jan 14, 2015 at 11:20 AM, ABL <[email protected]> wrote:
> I am trying to implement transposing instrument import of capella files.
> I think I almost finished with that (I will soon submit a PR), but I found
> something strange in the tpc implementation.
> The capella import is using function "setTpcFromPitch" to set tpc1 and
> tpc2,
> but I found that this function in some corner cases gives a "wrong" value
> for tpc2.
> This can be seen also when inserting a grace note, which uses the same
> function to evaluate tpcs.
> Example:
> - score for F Horn with written key signature Db major (actual key
> signature
> Gb major)
> - create a natural E in the fourth space [i.e. type E (possible
> ctrl+up/down
> to correct the octave) and then up arrow]. Its parameters, as shown in the
> debugger are:
> pitch: 69 epitch: 76 tpc1: 17 tpc2: 18 line: 1
> - Exit note-edit mode, select the natural E and double-click
> "acciaccatura".
> Here is the strange behavior: we would expect a natural E acciaccatura, but
> we obtain a flat F acciaccatura. Its parameters, from the debugger, are:
> pitch: 69 epitch: 76 tpc1: 17 tpc2: 6 line: 0
> Now, if you play with up and down arrow a few times, you obtain natural E
> with parameters:
> pitch: 69 epitch: 76 tpc1: 17 tpc2: 18 line: 1
> and flat F with parameters:
> pitch: 69 epitch: 76 tpc1: 5 tpc2: 6 line: 0
> As you can see, the result from "setTpcFromPitch" is different. Is it a bug
> of that fuction or am I missing the behavior of tpcs?
> Moreover, should the "key" be transposed in one of the call to "pitch2tpc"
> inside the "setTpcFromPitch" function (the first one, with " -
> transposition()" probably)?
> By the way, what do these parameters (tpc1 and tpc2) represent? I
> understood
> that they are related to transposition and note spelling, but I can't
> understand the fine details.
>
> Thank you very much for your help.
>
> Ciao,
> ABL
>
>
>
>
> --
> View this message in context:
> http://dev-list.musescore.org/TPC1-TPC2-tp7579075.html
> Sent from the MuseScore Developer mailing list archive at Nabble.com.
>
>
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