Vrftsjtryk

Here is how I'm drawing it currently:

documentclass{article}

usepackage{tikz}

usepackage[paperwidth=15cm]{geometry}



begin{document}

noindent



begin{tikzpicture}

node[draw,rectangle,text width=8cm,align=center] (qw) at (0,0) {texttt{rax}} ;

node[label={footnotesize{63}}] (top) at (-4,0) {} ;

node[label={footnotesize{31}}] (low32) at (0,0) {} ;

node[label={footnotesize{15}}] (low16) at (2,0) {} ;

node[label={footnotesize{7}}] (low8) at (3,0) {} ;

node[label={footnotesize{0}}] (bot) at (4,0) {} ;

node[draw,rectangle,text width=4cm,align=center,xshift=2cm,yshift=-0.7cm] (dw) {texttt{eax}} ;

node[draw,rectangle,text width=2cm,align=center,xshift=3cm,yshift=-1.4cm] (w) {texttt{ax}} ;

node[draw,rectangle,text width=1cm,align=center,xshift=2.5cm,yshift=-2.1cm] (hb) {texttt{ah}} ;

node[draw,rectangle,text width=1cm,align=center,xshift=3.5cm,yshift=-2.1cm] (lb) {texttt{al}} ;

end{tikzpicture}



end{document}

It looks like this:

Everything is fine except for the final row, where the two rectangles appear to be overlapping. There should only ve one line in between ah and al—exactly in the middle. How do I fix this?

You can set inner xsep=0pt:

Code:

documentclass{article}

usepackage{tikz}

usepackage[paperwidth=15cm]{geometry}





begin{document}

noindent

begin{tikzpicture}[inner xsep=0pt]

node[draw,rectangle,text width=8cm,align=center] (qw) at (0,0) {texttt{rax}} ;

node[label={footnotesize{63}}] (top) at (-4,0) {} ;

node[label={footnotesize{31}}] (low32) at (0,0) {} ;

node[label={footnotesize{15}}] (low16) at (2,0) {} ;

node[label={footnotesize{7}}] (low8) at (3,0) {} ;

node[label={footnotesize{0}}] (bot) at (4,0) {} ;

node[draw,rectangle,text width=4cm,align=center,xshift=2cm,yshift=-0.7cm] (dw) {texttt{eax}} ;

node[draw,rectangle,text width=2cm,align=center,xshift=3cm,yshift=-1.4cm] (w) {texttt{ax}} ;

node[draw,rectangle,text width=1cm,align=center,xshift=2.5cm,yshift=-2.1cm] (hb) {texttt{ah}} ;

node[draw,rectangle,text width=1cm,align=center,xshift=3.5cm,yshift=-2.1cm] (lb) {texttt{al}} ;

end{tikzpicture}

end {document}

off-topic, for fun and exercises:

documentclass{article}

usepackage[paperwidth=15cm]{geometry}

usepackage{tikz}

usetikzlibrary{positioning}



begin{document}

noindent%

    begin{tikzpicture}[

node distance = 3mm and 0mm,

   box/.style = {draw, text width=#1, align=center,minimum height=5mm,

                 inner sep=0pt, outer sep=0pt, font=ttfamily},

   lbl/.style = {font=footnotesize, inner sep=0pt, above=3mm}

                        ]

node[box=8cm,right=of {(0,0)}] (qw) {rax};

node[lbl] at (0,0) {63};

node[lbl] at (4,0) {31};

node[lbl] at (6,0) {15};

node[lbl] at (7,0) {7} ;

node[lbl] at (8,0) {0} ;

node[box=4cm,below left=of qw.south east] (dw) {eax};

node[box=2cm,below left=of dw.south east] (w)  {ax} ;

node[box=1cm,below left=of w.south east]  (hb) {ah} ;

node[box=1cm,left=of hb] (lb) {al} ;

    end{tikzpicture}

end {document}

result:

addendum:
one ore solution, using chains library:

documentclass{article}

usepackage[paperwidth=15cm]{geometry}

usepackage{tikz}

usetikzlibrary{chains,positioning}



begin{document}

noindent%

    begin{tikzpicture}[

node distance = 3mm and 0mm,

    start chain= going below,

   box/.style = {draw, text width=#1, align=center,minimum height=5mm,

                 inner sep=0pt, outer sep=0pt, font=ttfamily,

                 on chain,anchor=north west},

   lbl/.style = {font=footnotesize, inner sep=0pt, above=3mm}

                        ]

node[box=8cm,right=of {(0,0)}] (qw) {rax};

node[lbl] at (0,0) {63};

node[lbl] at (4,0) {31};

node[lbl] at (6,0) {15};

node[lbl] at (7,0) {7} ;

node[lbl] at (8,0) {0} ;

node[box=4cm] (dw) {eax};

node[box=2cm] (w)  {ax} ;

node[box=1cm]  (hb) {ah} ;

node[box=1cm,left=of hb] (lb) {al} ;

    end{tikzpicture}

end {document}

the result is the same as before.