[luatex] Change background color for Plain TeX using LuaTeX?
Henri Menke
henrimenke at gmail.com
Sun Nov 25 03:39:01 CET 2018
On 11/25/18 3:30 PM, Henri Menke wrote:
> On 11/25/18 2:56 PM, Steve Litt wrote:
>> This regards Plain TeX. I know there are ways to easily do it in
>> LaTeX.
>>
>> Is there something I can put within \directlua{} or anywhere else
>> to change the background color of a series of letters or a series of
>> lines?
>
> You can change the backgroundcolor of the page like shown below. You
> can easily adapt the code for only a single box.
>
> {\catcode`\.=12
> \catcode`\p=12
> \catcode`\t=12
> \gdef\WITHOUTPT#1pt{#1}}
>
> \def\withoutpt#1%
> {\expandafter\WITHOUTPT#1}
>
> \pdfextension literal page {
> q % push current graphics state onto the stack
> 0 0 1 rg % RGB color for non-stroking operation
> 0 0 1 RG % RGB color for stroking operation
> n % end the current path object without filling or stroking
> 0 0 \withoutpt{\the\pagewidth} \withoutpt{\the\pageheight} re %
> construct rectangle
> f % fill the path
> Q % pop previous graphics state off the stack
> }
>
> Hello World!
>
> \bye
To set the background color of a single box, I'd just put a colored rule
behind it.
\protected\def\colorbox[#1]#2{%
\setbox0=\hbox{#2}
\leavevmode\rlap{%
\pdfextension literal direct {
q
#1 rg
}%
\vrule width \wd0 height \ht0 depth \dp0\relax
\pdfextension literal direct {
Q
}%
}\box0
}
\colorbox[0 0 1]{Hello World!}
\colorbox[1 0 0]{\it different}
\colorbox[.3 .7 .1]{\TeX}
\bye
>
>>
>> Thanks,
>>
>> SteveT
>>
>> Steve Litt
>> November 2018 featured book: Manager's Guide to Technical
>> Troubleshooting Brand new, second edition
>> http://www.troubleshooters.com/mgr
>>
>
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