Re: Custom noteheads stem alignment

[Pierre Perol-Schneider]

Hi Paul,

Thanks for the reminder! Makes me think that I could simplified lots of my path's codes ;).

Anyway...

I suppose that for 'make-path-stencil',  'Z' stays for 'closepath', doesn't it? So what's 'z' for ?

Cheers,

Pierre

2015-04-13 15:40 GMT+02:00 Paul Morris <address@hidden>:

Schneidy wrote
> Now I understand - font size changes won’t affect this code as it is not
>> drawing from the font. But I am not sure what code will scale the
>> noteheads. Do I need a separate stencil for different sizes? That’s not
>> so
>> bad, as I only want to differentiate normal notes and grace notes.
>>
>
> Yes, I think you'll have to scale note heads for graces' (e.g. \scale
> #'(.8
> . .8) \sOne)
> Does it help?
> Cheers,
> Pierre

For another example of how to scale such custom stencils, especially with
the font size, but also to create a smaller grace note version, see:
http://lsr.di.unimi.it/LSR/Item?id=623

Especially this part:

scaleCustomClefStencilTwo =
#(lambda (grob)
    (let* ((sz (ly:grob-property grob 'font-size 0.0))
           (mult (magstep sz)))
        (set! (ly:grob-property grob 'stencil)
          (ly:stencil-scale
            customClefStencilTwo
            mult mult))))


This snippet shows a different way to make a path stencil with:
  #(ly:make-stencil `(path
this is a low level way and it requires you to specify the X and Y extents
of the stencil.

See a higher level method here:
  Using make-connected-path-stencil to draw custom shapes
  http://lsr.di.unimi.it/LSR/Item?id=891
Which calculates the X and Y extents for you, but the path has to be
connected.

In 2.19 there is an improved version "make-path-stencil" where the path
doesn't need to be connected. There's not a snippet for it yet because it's
not in 2.18.  As far as I know this method provides the most flexibility and
least constraints.  Here are some examples (the use of \markup here is just
for convenient demonstration):

%%%%%%%%%%%%%%%%%
\version "2.19"

{

  c'1^\markup \stencil
  #(make-path-stencil
    ;; path, accepts both "rmoveto" and "m", "curveto" and "C", etc.
    '(rmoveto -1 1
       rcurveto 0 0.75 1 0.75 1 0
       rcurveto 0 -0.75 -1 -0.75 -1 0
       rcurveto -1 0 -1 1.5 -0.5 1.5
       rmoveto 0.5 -1.5
       c -1 0 -1 -1.5 -0.5 -1.5
       m 1.5 1.5
       c 2.5 0 2.5 4 4 4
       m -4 -4
       c 2.5 0 2.5 -4 4 -4)
    ;; line thickness
    0.2
    ;; x and y scaling factors
    1 1
    ;; filled?
    #f)

  c'1^\markup \stencil
  #(make-path-stencil
    `(rmoveto 0 0
       rlineto 2 0
       rlineto 0 -2
       rlineto -2 0
       closepath
       rmoveto 1.1 -1.1
       rlineto 2 0
       rlineto 0 -2
       rlineto -2 0
       closepath
       rmoveto 1.1 -1.1
       rlineto 2 0
       rlineto 0 -2
       rlineto -2 0
       closepath)
    0.2 1 1 #f)

  c'1^\markup \stencil
  #(make-path-stencil
    '(moveto 6 0
       curveto 0 -2 0 7 6 5
       curveto 3 5 3 0 6 0)
    0.2 0.5 0.5 #f)

  c'1^\markup \stencil
  #(make-path-stencil `(L 0 0 L 1 2 L 2 0 Z M 1 3 L 1 0) 0.2 1 1 #f)

  c'1^\markup \stencil
  #(make-path-stencil `(l 1 2  L 2 0 z) 0.2 1 2 #t)

}

%%%%%%%%%%%%%%%

And then there's the \path markup command method that Pierre used.  This one
requires that you have access to a grob so you can do grob-interpret-markup
(which is not required by the other methods).

I think that covers it!
-Paul






--
View this message in context: http://lilypond.1069038.n5.nabble.com/Custom-noteheads-stem-alignment-tp174412p174461.html
Sent from the User mailing list archive at Nabble.com.

_______________________________________________
lilypond-user mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/lilypond-user