[texhax] font metrics
Philip TAYLOR [PC336/H-XP]
P.Taylor at Rhul.Ac.Uk
Thu Jun 5 22:28:57 CEST 2003
Karl Berry wrote:
>
> I would like to discuss about the slant parameter in the Tex font metric
> file. As far as i have come to know is that it is equal to the tangent of
> the angle in degrees from the vertical in the counter-clockwise direction.
>
> It is? That is not exactly clear to me either. tftopl.web (et al.) says:
>
> param[1]=@!slant| is the amount of italic slant, which is used
> to help position accents. For example, |slant=.25| means that when you go
> up one unit, you also go .25 units to the right. The |slant| is a pure
> number; it's the only |fix_word| other than the design size itself that is
> not scaled by the design size.
I think that, mathematically speaking, these are the almost same thing
(modulo the "counter" in "counter-clockwise", which I think is an error).
If as per Don's text you go up 1 and right 0.25, then you have two
conceptual sides of a right-angled triangle which, in terms of the angle
from the origin to the point reached after going up 1 and right 0.25
represent the opposite and adjacent sides. Since
$$ \tan {theta} = opposite \over adjacent $$
I believe that both jim_938 and DEK are saying the same thing but just
using different terminology.
** Phil.
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