Btukfyl

Is there a way to center a box (for example, adjustbox) even if the documents margins are not equal (left and right)?

documentclass{article}

usepackage{adjustbox}

usepackage[pass]{geometry}

usepackage{lipsum}



begin{document}



begin{adjustbox}{minipage=0.99paperwidth,margin=0pt,center}

lipsum[2]

end{adjustbox}



newgeometry{left=250pt,top=1cm,bottom=1cm,includefoot}

begin{adjustbox}{minipage=0.99paperwidth,margin=0pt,center}

lipsum[2]

end{adjustbox}



end{document}

You can put it inside a tikz node with position (current page.center) as follows:

documentclass{article}

usepackage{adjustbox}

usepackage[pass]{geometry}

usepackage{lipsum}

usepackage{tikz} 





begin{document}







begin{adjustbox}{minipage=paperwidth,margin=0pt,center}

    begin{tikzpicture}[overlay, remember picture]

    node[text width=0.7*linewidth] at (current page.center)

    {lipsum[2]};

    end{tikzpicture}

end{adjustbox}





newgeometry{left=250pt,top=1cm,bottom=1cm,includefoot}





 begin{adjustbox}{minipage=paperwidth,margin=0pt,center}

 begin{tikzpicture}[overlay, remember picture]

 node[text width=0.7*linewidth] at (current page.center)

 {lipsum[2]};

 end{tikzpicture}

  end{adjustbox}





end{document}

It is not clear exactly what you are centering on, but you can use the adjustwith command from the changepage package to temporarily adjust margins.

The command takes two arguments for left and right margin respectively. The value is the amount by which the text block will be REDUCED (so negative values enlarge). The effect is on linewidth not textwidth.

The below MWE and output together with some reading should explain.

documentclass{article}

usepackage[pass]{geometry}

 usepackage{changepage}



begin{document}



newgeometry{left=100pt,top=1cm,bottom=1cm,includefoot}



begin{center}

    Center within margins

end{center}    

Left

flushright Right



newgeometry{left=200pt,top=1cm,bottom=1cm,includefoot}



begin{center}

    Center within margins

end{center}    

begin{adjustwidth}{-100pt}{0pt}

    begin{center}

        Center on temporarily adjusted margin

    end{center}    

Left

flushright Right

end{adjustwidth}



newgeometry{left=300pt,top=1cm,bottom=1cm,includefoot}



begin{center}

    Center within margins

end{center}    

begin{adjustwidth}{-200pt}{0pt}

    begin{center}

        Center on temporarily adjusted margin

    end{center}    

Text

flushright Right

end{adjustwidth}



newgeometry{left=400pt,top=1cm,bottom=1cm,includefoot}



begin{center}

    Center within margins

end{center}    

begin{adjustwidth}{-300pt}{0pt}

    begin{center}

        Center on temporarily adjusted margin

    end{center}    

Text

flushright Right

end{adjustwidth}



end{document}

It is possible to automate slightly but depends what you are centering on. Manual use may be easiest when you understand how it works. Obviously if you have different margins on odd and even pages that needs taking into account as well.

If you want to center the box on the page, not the text area, one way to do this is to make it lap into the left text margin of the page. The required dimensions can be read using the layout package.

The following code uses the ifoddpage package together with adjustbox to get the right amount.

documentclass[twopages]{book}

usepackage{ifoddpage}

usepackage{adjustbox}

usepackage[pass,showframe]{geometry}

usepackage{layout}

usepackage{lipsum}





begin{document}

lipsum[1]



checkoddpage

begin{adjustbox}{minipage=0.95paperwidth,vspace=smallskipamount,frame,

lap={textwidth}{-1in-hoffset-ifoddpageoddsidemarginelseevensidemarginfi+.5paperwidth-.5Width}}

lipsum[2]

end{adjustbox}



lipsum



checkoddpage

begin{adjustbox}{minipage=0.95paperwidth,vspace=smallskipamount,frame,

lap={textwidth}{-1in-hoffset-ifoddpageoddsidemarginelseevensidemarginfi+.5paperwidth-.5Width}}

lipsum[2]

end{adjustbox}



lipsum[1]



clearpage

layout





end{document}