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Newsgroups: comp.lang.postscript
Date: Thu, 21 Jul 2022 12:02:39 -0700 (PDT)
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Subject: Re: ArcPrecise, an accurate arc
From: jdaw1 <jdawiseman@gmail.com>
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Xref: csiph.com comp.lang.postscript:3778

> so programmers have no surprises when they use ArcPrecise.

Good desideratum.=20

I=E2=80=99m coming to the view that ArcPrecise should have an extra paramet=
er, which could be one of three values:
=E2=9C=AA `/l` =E2=9F=B9=EF=B8=8E `arc`-style `lineto`;
=E2=9C=AA `/m` =E2=9F=B9=EF=B8=8E `moveto`, especially useful if previous c=
ommand was `closepath`;
=E2=9C=AA `/n` =E2=9F=B9=EF=B8=8E nothing, presumably because the currentpo=
int is already the start of the curve.

The compulsory extra parameter prevents surprises.


> Advice: 'ArcPrecise' should have the same API as 'arc'.=20

Good desideratum. And=20
`/arc {/l ArcPrecise} def`
would work as you require.


Would this extra final parameter, `/l` | `/m` | `/n`, satisfy everybody?