How can I center a tikzpicture horizontally by a certain point/coordinate?

Question

this is a rather nit-picky question but I wanted to ask anyway. Is is possible to center the tikz figure horizontally with using the coordinate indicated by the red circle?

The catch is, I have found an answer already. Martin Scharrer provided a "good" compact snippet here. But considering my level of expertise and that I just copy and pasted some code I would like to make sure: is this a good practice still? Maybe some things inside TikZ changed in the last ~2 years and it now can be done easier?

MWE

\documentclass[
11pt
]{scrartcl}
\usepackage{
tikz,
relsize,
tgheros
}

\usetikzlibrary{
    calc,trees,shadows,positioning,arrows,chains,shapes.geometric,
    decorations.pathreplacing,decorations.pathmorphing,shapes,
    matrix,shapes.symbols,patterns,intersections,fit
    }

\tikzset{
    >=latex
}
\tikzset{xcenter around/.style 2 args={execute at end picture={%
  \useasboundingbox let \p0 = (current bounding box.south west), \p1 = (current bounding box.north east),
                        \p2 = (#1), \p3 = (#2)
                    in
        ({min(\x2 + \x3 - \x1,\x0)},\y0) rectangle ({max(\x3 + \x2 - \x0,\x1)},\y1);
}}}

\begin{document}
\begin{center}
\begin{tikzpicture}[font=\sffamily\small,xcenter around = {0,0}{9,6}]
    %
    \draw[style=help lines,step=0.5cm] (0,0) grid (9.1,6.1);
    %
    \draw[->,thick] (-0.1,0) -- (9.5,0) node[anchor=west]{Employees}; %X-Achse
    \draw[->,thick] (0,-0.1) -- (0,6.5) node[anchor=south]{Sales}; %Y-Achse
    %
    \foreach \x in {0,1,...,9} \draw [thick](\x cm,-2pt) -- (\x cm,2pt);
    \foreach \y in {0,1,...,6} \draw [thick](-2pt,\y) -- (2pt,\y);
    %
    \foreach \x in {0,1,...,9} \draw (\x cm, 0 cm) node[anchor=north]{\x} coordinate (x axis);
    \foreach \y in {0,1,...,6}  \draw (0 cm, \y cm) node[anchor=east]{\y} coordinate (y axis);
    %
    \node (orig) at (0,0) {};
    \draw
    (2,1) coordinate (A)
    (3,3) coordinate (B)
    (6.5,4.5) coordinate (C)
        (5,2) coordinate (D)
        (9,5) coordinate (E)
    ;
    %
    \foreach \pt/\labpos in {B/above left,C/below,D/below left}{
      \filldraw (\pt) circle (2pt) node[\labpos=3pt,fill=white]{\pt};
    };
    \foreach \pt/\labpos in {A/below,E/below}{
      \filldraw[gray] (\pt) circle (2pt) node[\labpos=3pt,fill=white]{\pt};
    };
    %
    \draw[draw=red,fill=red] (4.5,3) circle (4pt);
\end{tikzpicture}
\end{center}
\end{document}

Answer 1

you can use the library fit to oversee all your scheme centering on the red dot and specifying a minimum width equal to the width of the page

\documentclass[
11pt
]{scrartcl}
\usepackage{
tikz,
relsize,
tgheros
}

\usetikzlibrary{
    calc,trees,shadows,positioning,arrows,chains,shapes.geometric,
    decorations.pathreplacing,decorations.pathmorphing,shapes,
    matrix,shapes.symbols,patterns,intersections,fit
    }

\tikzset{
    >=latex
}
\tikzset{xcenter around/.style 2 args={execute at end picture={%
  \useasboundingbox let \p0 = (current bounding box.south west), \p1 = (current bounding box.north east),
                        \p2 = (#1), \p3 = (#2)
                    in
        ({min(\x2 + \x3 - \x1,\x0)},\y0) rectangle ({max(\x3 + \x2 - \x0,\x1)},\y1);
}}}

\begin{document}
\begin{center}
\begin{tikzpicture}[font=\sffamily\small,xcenter around = {0,0}{9,6}]
    %
    \draw[style=help lines,step=0.5cm] (0,0) grid (9.1,6.1);
    %
    \draw[->,thick] (-0.1,0) -- (9.5,0) node[anchor=west](employees){Employees}; %X-Achse
    \draw[->,thick] (0,-0.1) -- (0,6.5) node[anchor=south](sales){Sales}; %Y-Achse
    %
    \foreach \x in {0,1,...,9} \draw [thick](\x cm,-2pt) -- (\x cm,2pt);
    \foreach \y in {0,1,...,6} \draw [thick](-2pt,\y) -- (2pt,\y);
    %
    \foreach \x in {0,1,...,9} \draw (\x cm, 0 cm) node[anchor=north]{\x} coordinate (x axis);
    \foreach \y in {0,1,...,6}  \draw (0 cm, \y cm) node[anchor=east]{\y} coordinate (y axis);
    %
    \node (orig) at (0,0) {};
    \draw
    (2,1) coordinate (A)
    (3,3) coordinate (B)
    (6.5,4.5) coordinate (C)
        (5,2) coordinate (D)
        (9,5) coordinate (E)
    ;
    %
    \foreach \pt/\labpos in {B/above left,C/below,D/below left}{
      \filldraw (\pt) circle (2pt) node[\labpos=3pt,fill=white]{\pt};
    };
    \foreach \pt/\labpos in {A/below,E/below}{
      \filldraw[gray] (\pt) circle (2pt) node[\labpos=3pt,fill=white]{\pt};
    };
    %
    \draw[draw=red,fill=red] (4.5,3)coordinate(center) circle (4pt);

\node[fit=(center) (employees) (sales),minimum width=\linewidth,draw]at(center){};
\end{tikzpicture}
\end{center}
\end{document}