[Lazarus] Update sound shop my next tutoring project

[silvioprog]

On Wed, May 15, 2019 at 4:51 PM Anthony Walter via lazarus <
lazarus at lists.lazarus-ide.org> wrote:

> I usually add GPL licences to my repositories but I forgot this time.
> Thanks for reminding me. It's now attached.
>
> Regarding the TPianoKeyboard class here is some helpful information.
>
> It's a TGraphicControl.
> It relies on the Music unit, also in the same project, to convert keys to
> frequencies and also to format note names as strings.
> You can define the number of keys on the piano by setting the KeyCount
> property. KeyCount ignores attempts to set its value to less than 1.
> You can change the on screen size of the piano by setting the ScaleFactor
> property.
> Setting Key[Index] := False/True turns the piano key from an
> released state to a pressed state (when true).
> You can listen to the OnKeyToggle event to take action when a piano key is
> pressed or released.
> The KeyToFrequency method gives you the frequency in hertz of the piano
> key by index.
> The piano does its best to keep middle C in the middle of its key layout
> when you change KeyCount.
>
> If you (or anyone really) have any improvement ideas for TPianoKeyboard or
> any other code in the project, let me know and I'll do my best to
> accommodate.
>

Two useful features (suggestions :-D):

* Split the "sound logic" from TPianoKeyboard to own class
(TPianoSynthesizer?) allowing to use it in non-LCL based applications;
* Supposing the feature above is done, the synthesizer could allow to
record key sequences by typing or by string. (it would be useful to study
applications like DefleMask project <http://www.delek.net> and play songs
(strings only, without drums, bass etc.) like "Sonic - Green Hill Zone"
https://www.youtube.com/watch?v=0YY13qh7X4A, "Spring Yard Zone"
https://www.youtube.com/watch?v=_8LUfR1iH_0. (Castlevania, Zelda and so on
<3)

--
Silvio Clécio
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