[metapost] btex..etex debugging

[Hans Hagen]

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

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