Re: Tweaking Hairpin shape

[David Nalesnik]

Hi Stefano,

On Thu, Feb 8, 2018 at 4:43 PM, Stefano Troncaro
<address@hidden> wrote:
> Hello again!
>
> I managed to modify David's translation of ly:hairpin::print to have it use
> two properties, Hairpin.rotate and Hairpin.straight-end, to achieve almost
> all the results I wanted.

Glad you got some use out of this!  I like the look of the
straight-edged hairpins.

>
> The idea is that Hairpin.rotate can be either a numerical value,
> representing the angle of rotation, or a procedure that returns the angle of
> rotation. In one of the examples I used the function discussed earlier in
> this thread to have it automatically detect the angle of a beam. However, I
> can't manage to make this idea work when the procedure given to
> Hairpin.rotate requires more than one variable. This is very inconvenient
> because for some cases the procedure would need to calculate again a lot of
> things that are already calculated in the process of making the stencil.

First of all, calling ly:grob-property calls any procedure the
property is set to.  The function ly:grob-property-data won't.

I don't know of any way in Scheme to overload functions or to count
arguments.  If you name your function, however, you can use
procedure-name.  (See the attached.)

HTH,
David

rotated hairpins.ly
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