Re: PNG generation ignoring color

[Valentin Villenave]

On 5/16/20, David Kastrup  wrote:
> Like the warning LilyPond prints out indicates, the X11 #rrggbb
> convention is not supported for specifying colors.  x11-color instead
> supports _named_ colors like "green".

Chris, you *could* simply change the definition or your function as follows:



color =
#(define-music-function (parser location color) (string?)
   (define (hexa->decimal x)
 (let ((num (string->number x 16)))
   (if (= 0 num)
   num
   (exact->inexact
(/ 255 num)
   (let* ((str (string-take
(if (string-prefix? "#" color)
(string-drop color 1)
color)
6))
  (r (string-take str 2))
  (g (string-drop (string-drop-right str 2) 2))
  (b (string-take-right str 2))
  (translated-color
   (map hexa->decimal
(list r g b)))
  (lily-color (primitive-eval
   (cons rgb-color translated-color
 #{
   %\override Staff.StaffSymbol.color = #lily-color
   \override Staff.LedgerLineSpanner.color = #lily-color
   \override Staff.Clef.color = #lily-color
   \override Staff.KeySignature.color = #lily-color
   \override Staff.TimeSignature.color = #lily-color
   %% Remove Staff. below to only affect individual voices:
   \override Staff.NoteHead.color = #lily-color
   \override Staff.Stem.color = #lily-color
   \override Staff.Flag.color = #lily-color
   \override Staff.Beam.color = #lily-color
   \override Staff.Accidental.color = #lily-color
   \override Staff.AccidentalCautionary.color = #lily-color
   \override Staff.Rest.color = #lily-color
   \override Staff.MultiMeasureRest.color = #lily-color
   \override Staff.MultiMeasureRestText.color = #lily-color
   \override Staff.MultiMeasureRestNumber.color = #lily-color
   \override Staff.Dots.color = #lily-color
   \override Staff.Slur.color = #lily-color
   \override Staff.PhrasingSlur.color = #lily-color
   \override Staff.Tie.color = #lily-color
   \override Staff.Script.color = #lily-color
   \override Staff.TextScript.color = #lily-color
   \override Staff.TupletBracket.color = #lily-color
   \override Staff.TupletNumber.color = #lily-color
   \override Staff.DynamicText.color = #lily-color
   \override Staff.DynamicTextSpanner.color = #lily-color
   \override Staff.DynamicLineSpanner.color = #lily-color
   \override Staff.Hairpin.color = #lily-color
 #}))



Cheers,
-- V.

Re: PNG generation ignoring color

[David Kastrup]

Chris Spencer  writes:

> How do you retain note color for PNG and SVG generation?
>
> I have the following Lilypond file test.ly:
>
> \version "2.18"
> color = #(define-music-function (parser location color) (string?) #{
> \once \override NoteHead #'color = #(x11-color color)
> \once \override Stem #'color = #(x11-color color)
> \once \override Rest #'color = #(x11-color color)
> \once \override Beam #'color = #(x11-color color)
>  #})
>
> \header {
>  tagline = ""
>   title = "Test1"
>
>   }
>
> \score  {
>
>   << \new Staff  = xawdxfwebzffzxy { \key a \major
>  \time 4/4
>  r 2
>  \color "#00FF00" e' 4


> and although I've specified all notes be green, running `lilypond
> --png test.ly` results in a black and white image.
>
> Why is this? Why are the color statements being ignored?

Like the warning LilyPond prints out indicates, the X11 #rrggbb
convention is not supported for specifying colors.  x11-color instead
supports _named_ colors like "green".

-- 
David Kastrup