From: Taco Hoekwater <taco@elvenkind.com>
To: Mojca Miklavec <mojca.miklavec.lists@gmail.com>
Cc: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: z0---z1---z2---z3---cycle strange effect
Date: Thu, 14 Jun 2007 11:24:49 +0200 [thread overview]
Message-ID: <46710961.2000201@elvenkind.com> (raw)
In-Reply-To: <6faad9f00706140159v23817b5rca6b097254d6eaca@mail.gmail.com>
Mojca Miklavec wrote:
> draw z0---z1---z2---z3---cycle withpen pencircle scaled 5pt;
>
> resulting in
>
> newpath
> 14.17323 42.51968 moveto
> 14.17139 42.52553 70.85913 70.86505 70.86613 70.86613 curveto
> 70.88313 70.86877 184.25645 14.18352 184.25194 14.17323 curveto
> 184.2461 14.15994 70.87599 42.51889 70.86613 42.51968 cureveto
> 70.86118 42.52008 14.17513 42.5137 14.17323 42.51968 curveto
> closepath
>
> If you ask me, this looks pretty much like a rendering bug in Mac's
> Preview (if anyone bothers about that, please do that),
agree
> but on the
> other hand metapost could have generated a shorter & cleaner output as
> well:
>
> newpath
> 14.17323 42.51968 moveto
> 70.86613 70.86613 lineto
> 184.25194 14.17323 lineto
> 70.86613 42.51968 lineto
> 14.17323 42.51968 lineto
> closepath
It would have done that, if the input would have been:
draw z0--z1--z2--z3--cycle withpen pencircle scaled 5pt;
Small differences like this should not be removed automatically, in
my opinion, as they will be visible if the image is to be printed
as a poster (A0 format).
> I suspect that the problem lies in control points of bezier curve
> which are way too close to original points and thus lead to problems
> with numerical precision, but I didn't experiment much deeper, so my
> assumption might be wrong.
Almost certainly, but rounding errors are not an excuse for obviously
incorrect rendering.
Best wishes, Taco
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prev parent reply other threads:[~2007-06-14 9:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-04 23:05 David Arnold
2007-06-14 8:59 ` Mojca Miklavec
2007-06-14 9:04 ` Mojca Miklavec
2007-06-14 11:03 ` Alan Bowen
2007-06-14 9:24 ` Taco Hoekwater [this message]
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