[metapost] wrong rightward arrow bounding box

[Hans Hagen]

On 23-12-2009 17:06, Laurent Méhats wrote:
> Hello,
>
> I'm getting a wrong bounding box for the cmr10 rightward arrow: the upper
> part of the head lies outside. I've run manually mpto from Tex Live 2008
> (mpost version 1.005) and indeed the rule to right is lower than the
> arrow. Any idea where this might come from ?

this is normal, just try to do the same in tex (drawing rules around the 
arrow)

(1) a boundingbox of a glyph is seldom exact and wd/ht/dp are not always 
reflected in the bbox

(2) math glyph often have special dimensions in order to get consistent 
math

Hans

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