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From:	"Sergey Stepanov (no DOT such DOT process AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Thu, 12 Jul 2018 22:57:50 +0500
Message-ID:	<CABuVar+uxfToiGjPYm2DSA5vTPuyW-Xz+pWcHUQskwcEStpH4Q@mail.gmail.com>
Subject:	Re: [geda-user] adventures using arrows (for documentation), or cross
	my lines
To:	geda-user AT delorie DOT com
Reply-To:	geda-user AT delorie DOT com

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Hello, there.

Some times ago I tried to solve similar problem about arrows.
The result is in the attached patch. It adds new "Line cap style" as
Arrow. The result can be seen at http://tinypic.com/r/b4htnl/9 .
The provided code is quick and dirty, arrow length is hardcoded, pdf
export problems, and so on, and so forth.. :-(

So, you can do everything you want with it. It is applied to the
latest git sources.

=D1=87=D1=82, 12 =D0=B8=D1=8E=D0=BB. 2018 =D0=B3. =D0=B2 22:31, <karl AT aspod=
ata.se>:
>
> Roland Lutz:
> > On Mon, 2 Jul 2018, karl AT aspodata DOT se wrote:
> > > c, use same line width as horiz. line, and use round cap style, i.e.
> > >   patch gschem/lepton-schematic so that they honor the cap style entr=
y
> > >   which is currently completely ignored and and an undocumented cap
> > >   style is used instead (called "miter" in postscript), see [3].
> >
> > "miter" is a join style, not a cap style.  Cap styles are honored in pa=
th
> > objects, but they only effect the ends of the path and don't have any
> > effect on closed paths at all.
>
> Correct.
>
> > > I'd prefer c to happen, since that would solve other line corner to
> > > straight line situations.
> >
> > I agree that it is preferable to solve this "properly", but cap styles
> > aren't going to help here.  IMHO, gEDA/gaf should be trying to be as
> > "standard" as possible here and allow the user to specify a PostScript
> > join style.
>
> Great.
>
> Ps and cairo has matching names of calls and settings for line cap,
> join and miter limit; geda only has for line caps.
>
> One way to solve this would be to match line caps and line joins:
>  end none (butt cap style) --- line join bevel
>  end square --- line join miter
>  end round --- line join round
>
> That would suffice for me.
>
> > This would mean adding an additional field to box and path objects.
> > Adding fields to the file format has been done before, it should be
> > considered carefully but can be done.
> >
> > > How difficult is that to implement and would such a patch be accepted=
 ?
> >
> > Implementing this would be a bit finicky but possible.  The problem her=
e
> > is not to produce a working patch but to consider all the implications =
in
> > the different places that would be affected. Since this makes reviewing
> > such a patch almost as bad as writing it in the first place, I don't th=
ink
> > submitting a patch will help.
>
> My guess is that the path diretive is only used within symbols. Looking
> through cvs.gedasymbols I found 103 (out of 2577) symbols with paths.
>
> $ find /Net/cvs/cvs.gedasymbols.org/www/user/ -type f -name \*.sym -print=
0 |
> > xargs -0 grep -l "^H " | wc -l
> 85
> $ find /Net/cvs/cvs.gedasymbols.org/www/user/ -type f -name \*.sym | wc -=
l
> 2577
>
> In all cases, except for
> theese 33:
> edward_hennessy/symbols/ech-regulator-current-1.sym
> edward_hennessy/symbols/ech-diode-schottky-1.sym
> edward_hennessy/symbols/ech-diode-schottky-2.sym
> edward_hennessy/symbols/ech-diode-tvs-1.sym
> edward_hennessy/symbols/ech-diode-tvs-2.sym
> edward_hennessy/symbols/ech-diode-zener-1.sym
> edward_hennessy/symbols/ech-diode-zener-2.sym
> edward_hennessy/symbols/ech-fuse-resettable-1.sym
> edward_hennessy/symbols/ech-fuse-resettable-2.sym
> edward_hennessy/symbols/ech-switch-momentary-no-3.sym
> edward_hennessy/symbols/ech-switch-momentary-no-4.sym
> edward_hennessy/symbols/ech-resistor-1.sym
> edward_hennessy/symbols/ech-resistor-2.sym
> edward_hennessy/symbols/ech-opamp-ti-lmv324idr-5.sym
> edward_hennessy/symbols/ech-transistor-npn-prebiased-1.sym
> edward_hennessy/symbols/ech-opamp-ti-lmv324idr-3.sym
> edward_hennessy/symbols/ech-opamp-ti-opa2348aid-1.sym
> edward_hennessy/symbols/ech-opamp-ti-opa2348aid-5.sym
> edward_hennessy/symbols/ech-thyristor-scr-1.sym
> edward_hennessy/symbols/ech-diode-littelfuse-smaj5.0a-1.sym
> edward_hennessy/symbols/ech-transistor-pnp-1.sym
> edward_hennessy/symbols/ech-ground-analog-1.sym
> edward_hennessy/symbols/ech-transistor-pnp-prebiased-1.sym
> edward_hennessy/symbols/ech-ground-chassis-1.sym
> edward_hennessy/symbols/ech-ground-digital-1.sym
> edward_hennessy/symbols/ech-ground-signal-1.sym
> edward_hennessy/symbols/ech-led-nichia-nesm026d-1.sym
> edward_hennessy/symbols/ech-thyristor-scr-2.sym
> edward_hennessy/symbols/ech-transistor-mosfet-nch-enh-dio-1.sym
> edward_hennessy/symbols/ech-transistor-mosfet-nch-dep-dio-1.sym
> edward_hennessy/symbols/ech-transistor-mosfet-pch-enh-dio-1.sym
> edward_hennessy/symbols/ech-diode-littelfuse-sm24canb-1.sym
> edward_hennessy/symbols/ech-opamp-ti-lmv324idr-1.sym
>
> the path operator is used for filled arrows (solid fill except for one
> case of a mesh filled arrow).
>
> $ find /Net/cvs/cvs.gedasymbols.org/www/user/ -type f -name \*.sym -print=
0 |
> > xargs -0 grep -l '^H ' | grep -v edward | xargs grep -h "^H " |
> > sort | uniq  -c
>      56 H 3 0 0 0 -1 -1 1 -1 -1 -1 -1 -1 4
>      26 H 3 0 0 0 -1 -1 1 -1 -1 -1 -1 -1 5
>       1 H 3 0 0 0 -1 -1 2 -1 -1 -1 -1 -1 5
>       5 H 6 0 0 0 -1 -1 1 -1 -1 -1 -1 -1 4
> I.e. everybody (other than Ed) uses filled paths with a line "width"
> of 0, and they use it for arrow tips.
>
> Filled arrow case definitely gain by having width =3D 0 =3D> actual width=
 =3D
> 0 so that the arrow tip doesn't go too far.
>
> I'd like filled paths with width to have a width of 0, and to be able to
> have round line join style.
>
> So we could ask Edward for his opinion. Ed, what is your take on this ?
>
> ...
> > As an immediate solutiuon to your problem, I suggest moving the arrow
> > object up a bit.  If you set a non-zero line width, the bottom tip of t=
he
> > arrow is well-defined, so if you wanted to, you could even calculate th=
e
> > perfect offset by which to move the arrow up.
>
> Already done so.
>
> Regards,
> /Karl Hammar
>
> -----------------------------------------------------------------------
> Asp=C3=B6 Data
> Lilla Asp=C3=B6 148
> S-742 94 =C3=96sthammar
> Sweden
> +46 173 140 57
>
>

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