Cfrgtkky

I'm currently using the following instruction to draw a horizontal rule from the left edge of the text body to the right edge of the paper:

rule{paperwidth}{2pt}

This works, but it results in an overfull warning:

Overfull hbox (232.295pt too wide) in paragraph at lines 12--13

The proper way to do this is probably to calculate the actual length, but I don't know how to do this. I read about an addtolength instruction but am not sure what I can add together. Can someone advise?

Without any package:

documentclass{article}



begin{document}



Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text. Some text.



noindentmakebox[0pt][l]{rule{paperwidth}{2pt}}par

Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text.



end{document} 

You can also use tikz package.

documentclass{article}

usepackage{tikz}

usepackage{lipsum}

begin{document}



lipsum[1]



noindentbegin{tikzpicture}[remember picture,overlay]

draw [line width=2pt] (0,0) -- (paperwidth, 0);

end{tikzpicture}



lipsum[2]

end{document} 

Under onside (the default) mode in article, the length from the left side of the text block to the right side of the page is given by

paperwidth - oddsidemargin - 1in - hoffset

%             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

%                       left margin

To see this, load the layout package and issue layout to see what lengths are at work:

However, as long as the length is longer than the above length, it'll stretch all the way to the right side of the page. So, you can just use paperwidth. Here's a macro version that allows some adjustment of the width via an optional argument:

documentclass{article}



newcommand{fullrule}[1][2pt]{%

  parnobreaknoindent

  makebox[0pt][l]{%

    rule[.5ex]{paperwidth}{#1}}par

}



usepackage{lipsum}



begin{document}



sloppylipsum[1]



fullrule



lipsum[2]



fullrule[.4pt]



lipsum[3]



end{document} 

Note that we place the rule inside a zero-width box to avoid any warnings about an overfull hbox.