Issues with MetaPost boxes

Issues with MetaPost boxes

[Andreas Schneider]

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Since some weeks I have strange problems with MetaPost in MKIV (beta). The
attached example should (and did in the past) output a central box ("Fakt")
surrounded by five boxes named "Dimension". However some of them (in that
particular example one) is drawn wrong: the box is on the right spot, but
the label seems to be at 0,0. It seems to happen whenever the boxes are
drawn from within a loop - at least all of my problems with boxes show
similar symptoms and only occur within loops.

Any ideas what goes wrong here?

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\startMPinclusions
	input boxes;
\stopMPinclusions

\startMPpage
	u := 1cm;
	
	circleit.fact(\sometxt{\bf Fakt});
	fact.c = (0u, 0u);
	fact.dx = fact.dy;

	drawboxed(fact);

	for i = 45 step 72 until 360:
		circleit.dim[i](\sometxt{Dimension});
		dim[i].c = 3u*right rotated i;
		dim[i].dx = dim[i].dy;
		drawoptions(dashed evenly);
		drawboxed(dim[i]);
		drawoptions();
		drawarrow fact.c -- dim[i].c cutbefore bpath.fact cutafter bpath.dim[i];
	endfor;
\stopMPpage

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Re: Issues with MetaPost boxes

[taco]

Andreas Schneider wrote:
> Since some weeks I have strange problems with MetaPost in MKIV (beta). The
> attached example should (and did in the past) output a central box ("Fakt")
> surrounded by five boxes named "Dimension". However some of them (in that
> particular example one) is drawn wrong: the box is on the right spot, but
> the label seems to be at 0,0. It seems to happen whenever the boxes are
> drawn from within a loop - at least all of my problems with boxes show
> similar symptoms and only occur within loops.
> 
> Any ideas what goes wrong here?

Probably a metapost bug, I'll check.
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Re: Issues with MetaPost boxes

[Taco Hoekwater]

On 08/14/2010 05:40 PM, taco wrote:
> Andreas Schneider wrote:
>> Since some weeks I have strange problems with MetaPost in MKIV (beta).
>> The
>> attached example should (and did in the past) output a central box
>> ("Fakt")
>> surrounded by five boxes named "Dimension". However some of them (in that
>> particular example one) is drawn wrong: the box is on the right spot, but
>> the label seems to be at 0,0. It seems to happen whenever the boxes are
>> drawn from within a loop - at least all of my problems with boxes show
>> similar symptoms and only occur within loops.
>>
>> Any ideas what goes wrong here?
>
> Probably a metapost bug, I'll check.

There were actually two metapost bugs from that single example.
Next week's luatex beta will have a fix for both.

Bug 1:

   show "45">"["; % 1.502 gives true, should be false

Bug 2:

   pair a[]b;
   a1b = (50,50);
   pair a[]c;
   show known a1b; % 1.502 gives false, should be true

Best wishes,
Taco
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Re: Issues with MetaPost boxes

[Andreas Schneider]

On Sun, 15 Aug 2010 17:34:25 +0200, Taco Hoekwater <taco@elvenkind.com>
wrote:
> There were actually two metapost bugs from that single example.
> Next week's luatex beta will have a fix for both.

Thanks for investigating and fixing it so fast! (well, I hope; we will see
;-))

Best Regards,
Andreas.
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Re: Issues with MetaPost boxes

[Andreas Schneider]

Taco Hoekwater wrote:
> There were actually two metapost bugs from that single example.
> Next week's luatex beta will have a fix for both.

Since I need this fix pretty soon, I thought a svn checkout and build might 
be a good idea. Getting luatex 0.62 beta compiled and running wasn't a 
problem, but the error with metapost still persists. ("This is LuaTeX, 
Version beta-0.62.0-2010082217 (rev 3815)")

Is there anything else I would need to get the fix in? Is it in a branch or 
is metapost even a lib on it's own? (It seemed to be statically linked, but 
I'm not completely sure if I missed something, so I better ask - which I 
hereby do.)

Thanks in advance!
Andreas.

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Re: Issues with MetaPost boxes

[taco]

Andreas Schneider wrote:
> Taco Hoekwater wrote:
>> There were actually two metapost bugs from that single example.
>> Next week's luatex beta will have a fix for both.

The fix is still in the metapost repository. I'll release a
new luatex beta tomorrow morning (with the fix).

Best wishes,
Taco
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