On 9/1/2021 12:48 PM, Henning Hraban Ramm via ntg-context wrote:
Hi, since Jacob started the pony mode, here’s one I’d like to ride:
MetaPost pens are constant, i.e. they never change over the length of a path.
Commercial vector graphics apps have “vector brushes”, e.g. Adobe Fresco:
https://helpx.adobe.com/fresco/using/vector-brushes.html
The page nicely shows the necessary variables.
In Inkscape you can combine “brush images” like
https://publicdomainvectors.org/en/free-clipart/Paintbrushes-for-Inkscape/86586.html
with pen shapes:
https://logosbynick.com/custom-brushes-in-inkscape/
This stretches the whole shape over the path – not perfect but good enough (and
the same what e.g. “my” Affinity Designer does).
(https://affinity.serif.com/designer/)
Is this possible with MetaFun, i.e. use a closed path and distort/stretch it
along an open path?
If, how?
you can try to 'reverse engineer the result' and see what is done by
looking at the output
anyway, i guess it some mix of existing basics, as in
\starttext
\startMPcode
path p ; p := fullcircle scaled 4cm ;
for i=1 upto 10 :
nodraw p xscaled (1 randomized .1) yscaled (1 randomized .1) ;
endfor ;
dodraw p xscaled (1 randomized .1) yscaled (1 randomized .1)
withtransparency (1,.5) ;
\stopMPcode
\startMPcode
path p ; p := fullcircle scaled 4cm ;
for i=1 upto 10 :
draw p xscaled (1 randomized .1) yscaled (1 randomized .1)
withtransparency (1,.5) ;
endfor ;
draw p xscaled (1 randomized .1) yscaled (1 randomized .1)
withtransparency (1,.5) ;
\stopMPcode
\startMPcode
path p ; p :=
( unitcircle xscaled (5cm randomized 5mm) yscaled (4cm
randomized 3mm)) --
(reverse (unitcircle xscaled (5cm randomized 3mm) yscaled (4cm
randomized 5mm))) -- cycle;
draw (p)
% withpattern image (fill fullcircle scaled 2mm withcolor
"darkyellow" ;)
% withpattern image (draw figure "mill.png" ;)
withpattern image (draw figure "hacker.jpg" ;)
withpatternscale (1/40,1/80)
;
\stopMPcode
\stoptext
so, fills, eofills, patterns and such
Hans
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Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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