Re: stencils with stroke-thickness set to zero
On Mon, Mar 10, 2014 at 8:11 AM, lpietsch lukas.piet...@freenet.de wrote:
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
Greetings, Lukas - This has been submitted as Issue 3882 :
https://code.google.com/p/lilypond/issues/detail?id=3882
Ralph
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stencils with stroke-thickness set to zero
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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