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Re: [Denemo-devel] New Education script::Counting half steps

From: Jeremiah Benham
Subject: Re: [Denemo-devel] New Education script::Counting half steps
Date: Mon, 23 Feb 2015 10:49:02 -0600

On Fri, Feb 20, 2015 at 11:24 AM, Richard Shann <address@hidden> wrote:
(this is just another instalment ... I can't write for long)

You can replace this with the use of Denemo's (disp ...) procedure which
can take any number of arguments so it would look like

(disp "You have chosen " CountHalfSteps::userinput " half steps\nThe
answer  was " CountHalfSteps::interval "\n")

I see that does make things easier. Thanks!


Another simplification - I assume none of the variables are used outside
of the script, so there is no need to create all those global variables
starting CountHalfSteps::
instead can avoid the long-winded names like CountHalfSteps::userinput
by enclosing the entire script in a (let ....) like this

(let ((userinput #f) (...) (...))

Ok. I will change this. I assume though that you would want to use globals if I was creating an init script.


the current script with CountHalfSteps::userinput replaced by userinput
and the (define CountHalfSteps::userinput 0) replaced with (set!
userinput #t) ...


Here the let is followed by a list of pairs, the name of the variable
and the initial value. This variable name is then local to the script.

The (display ...) feedback is only for debug I guess? You can use those
ticks and crosses for visible feedback to the user - I think you have
used them before? if not let me know and I can look them out.

Ok. I put the ticks and crosses back in. Yes. The (display ..) was really just for my own debugging.



On Wed, 2015-02-18 at 10:16 -0600, Jeremiah Benham wrote:
> I wrote a new script to drill the counting of half steps. It is still
> a work in progress because if a note has an accidental already in a
> measure then the second note inserted may be inaccurate because it
> can't tell if the current accidental list (in that measure) contains
> the note to be inserted. I was wondering how to remedy this. I could
> create an array defining accidentals to be something like -2 0 0 0 0 0
> 0 meaning that "A" has a double flat. I tried making the note inserted
> a whole note so that the accidental list is reset with each insert
> because the whole note takes up the entire measure. The problem I had
> was that occasionally denemo tried to put two whole notes in one
> measure. The only happened about 30% of the time. I guess it would be
> possible maybe desirable to write something in c that inserts lilypond
> note with the prevailing duration. At the moment we have the ability
> to place cursor at lilypond note. This is what I am currently using
> followed by a (d-1) to insert a half note.
> With a little modification the script can also drill half and whole
> step counting. This leads the student into spelling scales and chords.
> I hope to make some scripts for that also.
> Jeremiah
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