How to shift a path in Tikz, scope doesn´t work

Question

Given the example below, the scope command doesn't shift the path that I have been drawing. The only way I can achieve the what I am trying to do is by using explicit coordinates, but it would be much easier to use the cell numbers from the matrix m.

\documentclass[border=1cm]{standalone}
\usepackage{graphicx} % Required for inserting images
\usepackage{tikz}
\usetikzlibrary{matrix,shapes,arrows,fit,calc, automata}
\usepackage{listofitems}
\tikzset{cross/.style={cross out, draw=black, minimum size=2*(#1-\pgflinewidth), inner sep=0pt, outer sep=0pt},
%default radius will be 1pt. 
cross/.default={10pt}}
\begin{document}
\begin{tikzpicture}
\matrix(m) [matrix of math nodes, nodes in empty cells, nodes={minimum size=1cm, outer sep=0pt, text height=1.5ex, text depth=.25ex}]
{
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
};
\draw (m-1-1.north west) rectangle (m-12-12.south east);
\foreach \i in {3,6,9} {
    \draw (m-\i-1.south west) -- (m-\i-12.south east);
}
\foreach \j in {3,6,9} {
    \draw (m-1-\j.north east) -- (m-12-\j.south east);
}
\path[draw,purple, dashed,very thick] 
        (3.2,-5.8) node[circle,draw=purple!80, inner sep=1pt]  {+}
     -- (-2.8,-5.8) node[circle,draw=purple!80, inner sep=1pt]  {-}
   -- (-2.8,-2.8) node[circle,draw=purple!80, inner sep=1pt]  {+}
    -- (3.2,-2.8) node[circle,draw=purple!80, inner sep=1pt]  {-}
    -- (3.2,-5.8) node  {};
\begin{scope}[xshift=-5mm,yshift=-15mm]
    \path[draw,purple, dashed,very thick] 
        (m-3-1)  node[circle,draw=purple!80, inner sep=1pt]  {+}
     -- (m-3-10)  node[circle,draw=purple!80, inner sep=1pt]  {-}
     -- (m-12-10)  node[circle,draw=purple!80, inner sep=1pt]  {+}
    -- (m-12-1)  node[circle,draw=purple!80, inner sep=1pt]  {-}
    -- (m-3-1)  node  {};
\end{scope}
\end{tikzpicture}
\end{document}

A node and a coordinate are fixed positions in your diagram who will ignore coordinate transformations. You will need to use a canvas transformations (with its disadvantages) or you will need to apply the transformation for each reference to a node/coordinate. Furthermore, various other solutions/fixes/patches exist. — Qrrbrbirlbel, Jul 19 '23 at 11:21

score 4 · Accepted Answer · answered Jul 19 '23 at 11:17

You could transform the canvas:

\documentclass[border=1cm]{standalone}
\usepackage{graphicx} % Required for inserting images
\usepackage{tikz}
\usetikzlibrary{matrix,shapes,arrows,fit,calc, automata}
\usepackage{listofitems}
\tikzset{cross/.style={cross out, draw=black, minimum size=2*(#1-\pgflinewidth), inner sep=0pt, outer sep=0pt},
%default radius will be 1pt. 
cross/.default={10pt}}
\begin{document}
\begin{tikzpicture}
\matrix(m) [matrix of math nodes, nodes in empty cells, nodes={minimum size=1cm, outer sep=0pt, text height=1.5ex, text depth=.25ex}]
{
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
    &    &  &   &   &    &     &    &    &    &    &     \
};
\draw (m-1-1.north west) rectangle (m-12-12.south east);
\foreach \i in {3,6,9} {
    \draw (m-\i-1.south west) -- (m-\i-12.south east);
}
\foreach \j in {3,6,9} {
    \draw (m-1-\j.north east) -- (m-12-\j.south east);
}
\path[draw,purple, dashed,very thick] 
        (3.2,-5.8) node[circle,draw=purple!80, inner sep=1pt]  {+}
     -- (-2.8,-5.8) node[circle,draw=purple!80, inner sep=1pt]  {-}
   -- (-2.8,-2.8) node[circle,draw=purple!80, inner sep=1pt]  {+}
    -- (3.2,-2.8) node[circle,draw=purple!80, inner sep=1pt]  {-}
    -- (3.2,-5.8) node  {};
\begin{scope}[transform canvas={xshift=-5mm,yshift=-15mm}]
    \path[draw,purple, dashed,very thick] 
        (m-3-1)  node[circle,draw=purple!80, inner sep=1pt]  {+}
     -- (m-3-10)  node[circle,draw=purple!80, inner sep=1pt]  {-}
     -- (m-12-10)  node[circle,draw=purple!80, inner sep=1pt]  {+}
    -- (m-12-1)  node[circle,draw=purple!80, inner sep=1pt]  {-}
    -- (m-3-1)  node  {};
\end{scope}
\end{tikzpicture}
\end{document}

Thanks for the neat solution. – John W. de Burgh Jul 19 '23 at 16:29 — John W. de Burgh, Jul 19 '23 at 16:29
@JohnW.deBurgh You're welcome! – samcarter_is_at_topanswers.xyz Jul 19 '23 at 16:51 — samcarter_is_at_topanswers.xyz, Jul 19 '23 at 16:51

How to shift a path in Tikz, scope doesn´t work

1 Answers1