From: Patrick Gundlach <patrick@gundla.ch>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: xml and lua again
Date: Fri, 28 Oct 2011 08:44:07 +0200 [thread overview]
Message-ID: <83BD5F74-4BB7-41D2-9C1E-F5F31084E6AC@gundla.ch> (raw)
In-Reply-To: <4EAA4A61.4090707@uni-bonn.de>
>>>>
>>>> context.blackrule{ width = number.topoints(tex.dimen["textwidth"]/2) }
>>
>> or just tex.dimen["textwidth"]/2 .. "sp"
>
> Wait, just so I understand: your solution would imply that tex.dimen["textwidth"] holds a number, not a dimension, right? (Because you simply concatenate it with a dimension unit). Which makes sense when I think of it because lua has no concept of dimensions, only of strings, functions, tables, numbers... Whereas the Wolfgang implies that the result is already in sp. So who's right?
both :)
tex.dimen holds a number, that is the size in points, multiplied by 65536/1pt, so for example 3pt becomes
3pt * 65536
----------- = 3 * 65536 = 196608
1pt
This number is also known "sp". So if you store the number 3*65536 in tex.dimen[...], you can say:
my width is \directlua{ tex.dimen[...] / 2}sp (results to "my width is 196608sp", which you can use as an argument to whatever needs a length)
or
my width is \directlua{ number_to_points(tex.dimen[...]) } where number_to_points is something like
number_to_points = function (amount_in_sp)
in_pt = tostring(amount_in_sp / 65536)
return in_pt .. "pt"
end
which gives "3pt".
Patrick
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next prev parent reply other threads:[~2011-10-28 6:44 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-22 16:46 Thomas A. Schmitz
2011-10-23 14:04 ` Peter Rolf
2011-10-23 14:37 ` Thomas A. Schmitz
2011-10-23 15:25 ` Peter Rolf
2011-10-23 18:15 ` Peter Rolf
2011-10-24 10:17 ` Hans Hagen
2011-10-24 12:18 ` Thomas A. Schmitz
2011-10-24 12:26 ` Hans Hagen
2011-10-24 17:00 ` Thomas A. Schmitz
2011-10-24 18:48 ` Hans Hagen
2011-10-25 9:43 ` Thomas A. Schmitz
2011-10-25 10:10 ` Wolfgang Schuster
2011-10-25 10:17 ` Hans Hagen
2011-10-25 10:27 ` Thomas A. Schmitz
2011-10-27 9:23 ` Thomas A. Schmitz
2011-10-27 9:53 ` Wolfgang Schuster
2011-10-27 10:32 ` Thomas A. Schmitz
2011-10-27 11:05 ` Hans Hagen
2011-10-28 6:23 ` Thomas A. Schmitz
2011-10-28 6:37 ` luigi scarso
2011-10-28 6:43 ` luigi scarso
2011-10-28 6:44 ` Patrick Gundlach [this message]
2011-10-28 6:55 ` Thomas A. Schmitz
2011-10-28 8:35 ` Wolfgang Schuster
2011-10-28 8:59 ` Hans Hagen
2011-10-28 8:56 ` Hans Hagen
2011-10-28 10:48 ` Thomas A. Schmitz
2011-10-28 11:23 ` luigi scarso
2011-10-28 11:42 ` Hans Hagen
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