Black box in Chapter definition: Memoir class

Question

I'm dealing with memoir class trying to create an own fancy chapter style for a project. I'm currently using TikZ and got some good advance. The issue, however, is a black box/line which does not vanish at all.

Here's the MWE:

\documentclass[a4paper,12pt,extrafontsizes,twoside,onecolumn,openany,draft]{memoir}

\setlrmarginsandblock{2.5cm}{2.5cm}{*}
\setulmarginsandblock{2.5cm}{2.5cm}{*}
\checkandfixthelayout

\usepackage{tikz}
\usepackage{color,calc}
\usepackage{lipsum}

\makeatletter
\renewcommand{\@chapapp}{Lição}

\newcommand*\BuildChpNumb[1]{%
    \begin{tikzpicture}
        \draw [-, rounded corners, thick, purple] (0,2) -- (0,0) -- (\textwidth,0) -- (\textwidth,2);
        \node at (\textwidth - 200,1) {\chaptitlefont #1};
    \end{tikzpicture}
}
\makechapterstyle{Filipe}{%
    \renewcommand{\chapnamefont}{\large\scshape}
    \renewcommand{\chapnumfont}{\Huge\bfseries}
    \renewcommand{\chaptitlefont}{\Huge\bfseries}
    \setlength{\beforechapskip}{0pt}
    \setlength{\midchapskip}{0pt}
    \setlength{\afterchapskip}{0pt}
    \renewcommand{\printchaptername}{}
    \renewcommand{\chapternamenum}{}
    \renewcommand{\printchapternum}{}
    \renewcommand{\afterchapternum}{}
    \renewcommand{\afterchaptertitle}{}
    \renewcommand{\printchaptertitle}[1]{%
        \BuildChpNumb{##1}\par
    }%
}
\chapterstyle{Filipe}
\makeatother

\begin{document}

\chapter{A MWE}
    \section{Introduction}
        \lipsum[1-5]
    \section{History of the MWE}
        \lipsum[6-10]

\end{document}

And the result comes out with this damn line just in the rightside of the header box.

How to get rid of it?

Answer 1

I believe that it's because of draft definition in memoir. If you put final instead of draft, it should disappear.

EDIT: After some research it's a margin warning that shows only in draft mode.

Answer 2

Tiago Correia already explained that the black bar marks an overfull box. To get rid of it, you could make your chapter decoration a tiny bit smaller by not going all the way to \textwidth but just .99\textwidth.

\documentclass[a4paper,12pt,extrafontsizes,twoside,onecolumn,openany,draft]{memoir}

\setlrmarginsandblock{2.5cm}{2.5cm}{*}
\setulmarginsandblock{2.5cm}{2.5cm}{*}
\checkandfixthelayout

\usepackage{tikz}
\usepackage{color,calc}
\usepackage{lipsum}

\makeatletter
\renewcommand{\@chapapp}{Lição}

\newcommand*\BuildChpNumb[1]{%
    \begin{tikzpicture}
        \draw [-, rounded corners, thick, purple] (0,2) -- (0,0) -- (.99\textwidth,0) -- (.99\textwidth,2);
        \node at (.99\textwidth - 200,1) {\chaptitlefont #1};
    \end{tikzpicture}
}
\makechapterstyle{Filipe}{%
    \renewcommand{\chapnamefont}{\large\scshape}
    \renewcommand{\chapnumfont}{\Huge\bfseries}
    \renewcommand{\chaptitlefont}{\Huge\bfseries}
    \setlength{\beforechapskip}{0pt}
    \setlength{\midchapskip}{0pt}
    \setlength{\afterchapskip}{0pt}
    \renewcommand{\printchaptername}{}
    \renewcommand{\chapternamenum}{}
    \renewcommand{\printchapternum}{}
    \renewcommand{\afterchapternum}{}
    \renewcommand{\afterchaptertitle}{}
    \renewcommand{\printchaptertitle}[1]{%
        \BuildChpNumb{##1}\par
    }%
}
\chapterstyle{Filipe}
\makeatother

\begin{document}

\chapter{A MWE}
    \section{Introduction}
        \lipsum[1-5]
    \section{History of the MWE}
        \lipsum[6-10]

\end{document}

Answer 3

Maybe you like different definition of your chapter style:

\documentclass[a4paper,12pt,extrafontsizes,twoside,onecolumn,openany,draft]{memoir}

\setlrmarginsandblock{2.5cm}{2.5cm}{*}
\setulmarginsandblock{2.5cm}{2.5cm}{*}
\checkandfixthelayout

\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usepackage{color}
\usepackage{lipsum}

\makeatletter
%\renewcommand{\@chapapp}{Lição}

\newcommand*\BuildChpNumb[1]{% changed definition
    \begin{tikzpicture}
        \node[name=chapter, inner sep=0pt,
              text width=\dimexpr\textwidth-2pt\relax,
              minimum height=2cm,
              align=center, font=\chaptitlefont]  {#1};
        \path[draw=purple, rounded corners, line width=1pt]
        (chapter.north west) |- (chapter.south) -| (chapter.north east);
    \end{tikzpicture}
}
\makechapterstyle{Filipe}{%
    \renewcommand{\chapnamefont}{\large\scshape}
    \renewcommand{\chapnumfont}{\Huge\bfseries}
    \renewcommand{\chaptitlefont}{\Huge\bfseries}
    \setlength{\beforechapskip}{0pt}
    \setlength{\midchapskip}{0pt}
    \setlength{\afterchapskip}{0pt}
    \renewcommand{\printchaptername}{}
    \renewcommand{\chapternamenum}{}
    \renewcommand{\printchapternum}{}
    \renewcommand{\afterchapternum}{}
    \renewcommand{\afterchaptertitle}{}
    \renewcommand{\printchaptertitle}[1]{%
        \BuildChpNumb{##1}\par
    }%
}
\makeatother

\begin{document}
\chapterstyle{Filipe}

\chapter{A MWE}
    \section{Introduction}
        \lipsum[1-5]
    \section{History of the MWE}
        \lipsum[6-10]

\end{document}

Answer 4

You don't need to guess how much you need to shrink the box. Latex LaTeX tells you, if you look at the output or the log file:

Overfull \hbox (0.79999pt too wide) in paragraph at lines 41--41

You are specifying the position of the center of the purple line, not its outside edge. The line is 0.8pt wide, and the center of the line is 0.4pt away from the edge. You need to move the center of the line in by 0.4pt on each side, so the outside edges are exactly \textwidth apart.

Also, you should center the text accurately, not with a "guess" at the position like \textwidth - 200. if you want position the center of the text at "half the \textwidth", then say so!

\newcommand*\BuildChpNumb[1]{%
    \begin{tikzpicture}
        \draw [-, rounded corners, thick, purple] (0.4pt,2) -- (0.4pt,0) -- (\textwidth-0.4pt,0) -- (\textwidth-0.4pt,2);
        \node at (0.5\textwidth,1) {\chaptitlefont #1};
    \end{tikzpicture}
}

You could ignore this and get rid of the black bar by changing the draft option in memoir to final. Most people won't notice an alignment error in the purple line of only 0.8pt. But personally I always try to fix these problems properly so they don't give warning messages - and that is easy to do.