scientific notation in PDF file

scientific notation in PDF file

[Michail Vidiassov]

Dear Developers and All,

when I create a PDF dictionary with a small number

local mydict = lpdf.dictionary { TT = 0.000000000000000001 }
lpdf.flushobject(mydict)

I get in PDF

<< /TT 1e-18 >>

that confuses the Adobe Reader (if dictionary is used).

As far as I can investigate, lpdf.flushobject(mydict) calls
pdf.immediateobj(tostring(mydict)) and tostring does the actual damage
by introducing scientific notation.

What is the correct way to deal with the problem?
Converting the dictionary to string with my own code looks like a
possible workaround, not a solution.

Michail

PS.
Minimal example (it produces unused dictionary, so viewer does not complain)

\nopdfcompression
\starttext

\startluacode
local mydict = lpdf.dictionary { TT = 0.000000000000000001 }
lpdf.flushobject(mydict)
-- or, to the same result
-- pdf.immediateobj(tostring(mydict))
logs.reporter("","")("mydict %s",tostring(mydict))
\stopluacode

Test.

\stoptext

Context is
 current version: 2014.05.13 00:04
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Re: scientific notation in PDF file

[Hans Hagen]

On 5/18/2014 1:25 PM, Michail Vidiassov wrote:
> Dear Developers and All,
>
> when I create a PDF dictionary with a small number
>
> local mydict = lpdf.dictionary { TT = 0.000000000000000001 }
> lpdf.flushobject(mydict)
>
> I get in PDF
>
> << /TT 1e-18 >>
>
> that confuses the Adobe Reader (if dictionary is used).
>
> As far as I can investigate, lpdf.flushobject(mydict) calls
> pdf.immediateobj(tostring(mydict)) and tostring does the actual damage
> by introducing scientific notation.

yes, tostring is not the most clever one on that

> What is the correct way to deal with the problem?

I'll use a different serializer. In next beta

Hans

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If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
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