Re: Piano/Xylophone key diagrams

[Thomas Morley]

2013/10/12 David Kastrup <address@hidden>:
> "Phil Holmes" <address@hidden> writes:
>
>> At college, one of my ensembles is a mixed-music group performing
>> modern music.  I normally get away with singing or "playing" a
>> triangle and bits of other untuned percussion.  Imagine my surprised
>> when I was given a xylophone piece to play.  Fortunately, it's only
>> one note at a time, and most of them are the same note, repeated for
>> four bars, so I generally have the time to work out where the next key
>> is when I'm playing the current one.  However, I thought it might be
>> interesting and vaguely useful to have some piano key diagrams which
>> show which key is to be played, rather like the fingering diagrams.
>> The attached image illustrates the kind of thing: playing D#.
>>
>> I know I could use box, rounded-box or filled-box, or moveto/lineto
>> commands to draw the boxes, so I clearly could create the diagrams
>> individually for each note.  However, I thought it would be better to
>> create a function to do this.  I'd presume the location of each box
>> would be in some sort of array/list, and that the function would use
>> the 'pitch of the note to determine which to fill.  However, I've read
>> our documentation on scheme and am stuck on how to start, either
>> creating the array/list and iterating over it to draw boxes, or
>> grabbing the pitch value of a note.
>>
>> Could anyone start me off on this and help when I get stuck again?
>
> Starting off would be on
> <URL:http://code.google.com/p/lilypond/issues/detail?id=3563#c4>.  Check
> its output.  This is basically what you need, except that you need to
> replace the C-Griff function which uses filled and non-filled circles in
> a three-row arrangement with a more tedious rectangular arrangement.
>
> The c-griff function here only does the formatting and would need to be
> completely replaced.  In contrast, the stuff in define-scheme-function
> could be kept unchanged.
>
> --
> David Kastrup
>
>
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Or maybe
http://lsr.dsi.unimi.it/LSR/Item?id=791
might give some inspiration.

Cheers,
  Harm