From: Peter Rolf <indiego@gmx.net>
To: ntg-context@ntg.nl
Subject: Re: metapost question (bug?)
Date: Thu, 21 Jul 2011 17:39:48 +0200 [thread overview]
Message-ID: <4E284844.6050709@gmx.net> (raw)
In-Reply-To: <CAG5iGsAA+xZzcpkP7Bvae_2e1++heo-P14xSQKzF0k+1Gwrt3A@mail.gmail.com>
Am 21.07.2011 16:53, schrieb luigi scarso:
> On Thu, Jul 21, 2011 at 4:39 PM, Alan Braslau <alan.braslau@cea.fr> wrote:
>> Hello,
>>
>> I have a question for metapost specialists:
>>
>> I am looking for some sort of effect, built upon a zig-zag line.
>> The first graphic in the minimal example below is as I would expect.
>> The second graphic seems to be drawn without the point at (0,0).
>> (Ignore the asymmetry at the end of the path in the 2nd, this
>> is to be expected in this minimal example.)
>>
>> Is the result correct or is this a bug?
>>
>> Alan
>>
>>
>>
>> \starttext
>>
>> \startTEXpage
>> \startMPcode
>> u := 1mm ;
>>
>> path p[] ;
>> p0 := ((0,0)--(1,0)) rotated 45 scaled 20u ;
>> pickup pensquare scaled 10u rotated 45 ;
>> draw p0 withcolor blue ;
>> pickup pensquare yscaled 2u xscaled 5u rotated 45 ;
>> draw p0 withcolor yellow ;
>> pickup pencircle scaled .1u ;
>> draw p0 ;
>> \stopMPcode
>> \stopTEXpage
>>
>> \startTEXpage
>> \startMPcode
>> p1 := ((0,0)--(sqrt(2),0)) rotated -30 scaled 20u
>> shifted point infinity of p0 ;
>> p2 := p0--p1 ;
>>
use
p2 := p0 & p1;
the reason for the 'unexpected' output is, that point 1 and 2 of the
path p2 are equal. keep in mind that drawing with an asymmetrical pen
has its own (complex) rules.
>> pickup pensquare scaled 10u rotated 45 ;
>> draw p2 withcolor blue ;
>> pickup pensquare yscaled 2u xscaled 5u rotated 45 ;
>> draw p2 withcolor yellow ;
>> pickup pencircle scaled .1u ;
>> draw p2 ;
>> \stopMPcode
>> \stopTEXpage
>>
>> \stoptext
> You are shifting by a certain amount : what is the net effect of
> shifted point infinity of p0 ?
>
afaik simply the last point of p0.
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next prev parent reply other threads:[~2011-07-21 15:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-21 14:39 Alan Braslau
2011-07-21 14:53 ` luigi scarso
2011-07-21 15:39 ` Peter Rolf [this message]
2011-07-21 21:21 ` Alan Braslau
2011-07-22 9:35 ` Peter Rolf
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