* Re: Vector Brushes for MetaFun?
2021-09-01 12:06 ` Hans Hagen via ntg-context
@ 2021-09-01 12:52 ` Henning Hraban Ramm via ntg-context
0 siblings, 0 replies; 3+ messages in thread
From: Henning Hraban Ramm via ntg-context @ 2021-09-01 12:52 UTC (permalink / raw)
To: mailing list for ConTeXt users; +Cc: Henning Hraban Ramm
[-- Attachment #1: Type: text/plain, Size: 2369 bytes --]
> Am 01.09.2021 um 14:06 schrieb Hans Hagen via ntg-context <ntg-context@ntg.nl>:
>
> 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
The Inkscape SVG just calls a path-effect "bend_path", see attachment.
If I save a “normal” SVG, the result is “flattened” into a path that looks the same but isn’t changeable any more.
> anyway, i guess it some mix of existing basics, as in
>
> \starttext
>
> \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
I tried to convert my “brush” into MP, but pstoedit fails on either SVG. It worked via an exported EPS though, see attachment.
I could then use the brush as a path, also with "withpattern", but that doesn’t stretch/distort the “pattern” along the path. And I don’t understand how the other fill options would do that.
Yes, I must learn more about MetaPost...
Hraban
[-- Attachment #2: brush-as-pen.svg --]
[-- Type: image/svg+xml, Size: 27561 bytes --]
[-- Attachment #3: brush.mp --]
[-- Type: application/octet-stream, Size: 15046 bytes --]
% Converted from PostScript(TM) to MetaPost by pstoedit
% MetaPost backend contributed by Scott Pakin <scott+ps2ed_AT_pakin.org>
% pstoedit is Copyright (C) 1993 - 2020 Wolfgang Glunz <wglunz35_AT_pstoedit.net>
% Generate structured PostScript
prologues := 1;
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% and with a given rotation angle
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rotated angle shifted origin;
enddef;
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fill (64.382797,23.226601)--(65.582001,23.226601)--(65.582001,22.828100)
--(64.382797,22.828100)--cycle;
fill (21.359400,16.664101)..controls (21.714800,16.644501) and (22.144501,16.546900)..(22.394501,16.628901)
..controls (22.523399,15.953100) and (21.093800,15.816400)..(20.792999,16.230499)
..controls (20.734400,16.625000) and (21.007799,16.683599)..(21.359400,16.664101)
--cycle;
fill (21.359400,16.664101)--cycle;
endfig;
end
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