There seems to be an inconsistency between the PS and the SVG backends in the
treatment of path stencils. In PS, it seems to be impossible to create a
filled shape with no visible contour line, whereas in SVG this is possible.
If you create a stencil with the thickness parameter set to zero (via
"make-path-stencil" or via "(ly:make-stencil ('path ..."), the SVG backend
will do just that: no visible contour stroke, just a filled shape. The PS
backend will add a visible hairline around the stencil, giving it at least
one pixel in extra width. This may result in quite a visible difference
between the two results, at least in screen display and with small or thin
shapes.
Test snippet:
#(define teststencil (make-path-stencil
'(moveto 0 0 lineto 0 1 lineto 0.05 1 lineto 0.05 0 closepath)
0 1 1 #t))
\markup { \stencil #teststencil }
This will result in a markedly thicker line on screen in the PS output than
in the SVG output.
To bring the PS behaviour in line with the SVG behaviour (which I find more
intuitive and more logical), change the path function in scm/output-ps.scm
so as to omit the "stroke" command if the "fill" parameter is #t and the
"thickness" parameter is zero. Change l.286-294 from:
(ly:format
"gsave currentpoint translate
~a setlinecap ~a setlinejoin ~a setlinewidth
~l gsave stroke grestore ~a grestore"
cap-numeric
join-numeric
thickness
(convert-path-exps exps)
(if fill? "fill" ""))))
to:
(ly:format
"gsave currentpoint translate
~a setlinecap ~a setlinejoin ~a setlinewidth
~l ~a ~a grestore"
cap-numeric
join-numeric
thickness
(convert-path-exps exps)
(if (or (not fill?)(> thickness 0)) "gsave stroke grestore" "")
(if fill? "fill" ""))))
--
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