[pdftex] Re: magic height 1.00376129150390625pt for coloring the rules

[Stanis³aw Romañski]

Heiko,

Thanks for the advice at this rather late hour ...
It worked OK.

Yours,

Stanislaw Romanski

----- Original Message -----
From: Heiko Oberdiek <oberdiek at ruf.uni-freiburg.de>
To: Stanis³aw Romañski <stas at pkt.com.pl>
Cc: <pdftex at tug.org>
Sent: Saturday, March 02, 2002 11:54 PM
Subject: Re: [pdftex] magic height 1.00376129150390625pt for coloring
therules


> On Sat, 2 Mar 2002, Stanis³aw Romañski wrote:
>
> > Is there something magic in the dimension 1.00376129150390625pt for
pdfTeX ?
>
> It is about 1bp, 1bp is the default unit for PDF or PostScript.
>
> > The rules of smaller height seem not to be colorable (and the higher
ones,
> > yes).
> > The simple code
> >
> > \pdfcompresslevel=0  \nopagenumbers
> > \pdfliteral{0 0.4 0.1 0 k} % Pink
> > \hbox{\vrule height 1.00376129150390625pt width 15pt depth 0pt}
> > \hbox{\vrule height 1.003761291503906249999999999999pt width 15pt depth
0pt}
> > \bye
> >
> > gives two rules: the upper is pink and the lower is set black. Why ?
>
> pdfTeX draws a rectangle for thick rules and fills them,
> it uses lines for thin rules, they are stroked.
> The limit between thick and thin is about 1bp.
>
> You have only set the color for filling, so only the thick rules
> will be colored. With \pdfliteral{0 0.4 0.1 0 K} you can set the
> color for stroking/thin rules.
>
> Yours sincerely
>   Heiko <oberdiek at uni-freiburg.de>
>
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