[metapost] btex..etex debugging

[Stefan Witzel]

Hi,

this is just a remark, as I said, I'm not really interested in the
bbox makro in this contex. However, I just noticed that the
documentation mpman.pdf (as of October 26, 2010) states that:

"If p is a picture, bbox p is equivalent to (llcorner p--lrcorner
p--urcorner p--ulcorner p--cycle)."

(page 27). So this is then just false, is it?

Best,
Stefan

2013/3/13 Stefan Witzel <s.witzel at uni-muenster.de>:
> Hi,
>
> ok, this is good to know, though bbox is such a suggestive name. But
> maybe I should explain my problem. Actually no bounding box is
> supposed to be there in the end. I just noticed that my labels are all
> over the place when using this new document class and tried to figure
> out why. As you can see in the attached image (with bbox and the
> actual bounding box) something goes wrong in determining the
> dimensions of the typeset text. But when I compile the debugging tex
> file (I added a vrule to see the left boundary) I get the rather
> reasonable looking pdf file attached.
> I also attached the metapost source. The document class is available
> at http://www.msp.warwick.ac.uk/agt/macros/gtpart.cls. I am grateful
> for suggestions about what might cause this problem.
>
> Best,
> Stefan
>
> 2013/3/13 Hans Hagen <pragma at wxs.nl>:
>> On 3/12/2013 10:41 PM, Stefan Witzel wrote:
>>>
>>> Hi,
>>>
>>> thanks Taco and Hans for the quick replies!
>>>
>>> 2013/3/12 Hans Hagen <pragma at wxs.nl>:
>>>>
>>>> The bbox depends on the ht/dp of characters and lines and often the
>>>> character boundingbox is not tight (and when you use type one fonts and
>>>> traditional tex characters this is even more true due to limitation s of
>>>> the
>>>> machinery).
>>>
>>>
>>> In my case it's actually very strange: the text exceeds the bounding
>>> box by an apparently fixed amount to the left. For example if I do
>>>
>>> draw(btex this is a test etex)
>>> draw(bbox(btex this is a test etex))
>>>
>>> the "th" wil stick out of the box. But hopefully the debugging will
>>> bring clarification (I'll try tomorrow).
>>
>>
>> ah .. youre not usinmg the boundingbox at all, but bbox which adds a margin
>> of 1 pt by default (bbmargin or so)
>>
>> just look at the attached:
>>
>> page 1: boundingbox currentpicture overlaid
>> page 2: bbox currentpicture overlaid
>> page 3: both overlaid
>>
>>
>> -----------------------------------------------------------------
>>                                           Hans Hagen | PRAGMA ADE
>>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>>     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>>                                              | www.pragma-pod.nl
>> -----------------------------------------------------------------
>
>
>
> --
> Dr. Stefan Witzel
> Mathematisches Institut der Universität Münster
> Einsteinstraße 62
> 48149 Münster
> http://wwwmath.uni-muenster.de/u/stefan.witzel



-- 
Dr. Stefan Witzel
Mathematisches Institut der Universität Münster
Einsteinstraße 62
48149 Münster
http://wwwmath.uni-muenster.de/u/stefan.witzel