TikZ에서는 기본값이 cm이지만 좌표 단위는 pt입니다.

Question

우리가 알고 있듯이 TikZ에서는 단위가 TikZ의 좌표에 언급되지 않은 경우 cm기본적으로 사용됩니다.

좌표를 추출할 때 단위는 cm. 그러나 TikZ는 좌표의 단위를 pt.

단위가 지정되지 않은 경우 TikZ는 좌표의 측정 단위를 어떻게 결정합니까?

MWE:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing}
\usetikzlibrary{decorations.markings}
\usetikzlibrary{calc}
\usetikzlibrary{positioning}
\tikzset{zigzag/.style={decorate,decoration=zigzag}}
\begin{document}

\newdimen\XCoord
\newdimen\YCoord
\newcommand*{\ExtractCoordinate}[1]{\path (#1); \pgfgetlastxy{\XCoord}{\YCoord};}

\begin{tikzpicture}
  \coordinate (c) at (0,-2);
  \coordinate (d) at (4,-2);
  \coordinate (e) at (2,-4);
  \draw[thick,red,zigzag,postaction={
    decoration={
        markings,
        mark=at position 0.7 with { \coordinate (x); },
        mark=at position 0.5 with { \coordinate (singularity); },
    },
    decorate
  }] (-2,0) coordinate(a) -- (2,0) coordinate(b);

  \draw[thick,fill=blue!20] (c) -- (b) -- (d) -- (e) -- cycle;
  \draw[thick,postaction={
    decoration={
        markings,
        mark = at position 0.7 with \coordinate (y);
    },
    decorate
  }] (a) -- (c);
  \draw[thick,red,dashed] (x) -- (y);

  \node[above = 10ex of singularity,red] (sn) {singularity};
  \draw[red,->] (sn) -- ($(singularity)+(0,1)$);
  \ExtractCoordinate{x};
  \node[above] at (\XCoord,\YCoord) {(\XCoord,\YCoord)};
\end{tikzpicture}

\end{document} 

Answer 1

비율이나 그 역수를 곱하여 언제든지 pt에서 cm로 또는 그 반대로 모든 것을 변환할 수 있습니다 1pt/1cm. (원하시는 내용이 아니라면 게시물을 삭제하겠습니다.)

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing}
\usetikzlibrary{decorations.markings}
\usetikzlibrary{calc}
\usetikzlibrary{positioning}
\tikzset{zigzag/.style={decorate,decoration=zigzag}}
\begin{document}

\newdimen\XCoord
\newdimen\YCoord
\newcommand*{\ExtractCoordinate}[1]{\path (#1); \pgfgetlastxy{\XCoord}{\YCoord};}

\begin{tikzpicture}
  \coordinate (c) at (0,-2);
  \coordinate (d) at (4,-2);
  \coordinate (e) at (2,-4);
  \draw[thick,red,zigzag,postaction={
    decoration={
        markings,
        mark=at position 0.7 with { \coordinate (x); },
        mark=at position 0.5 with { \coordinate (singularity); },
    },
    decorate
  }] (-2,0) coordinate(a) -- (2,0) coordinate(b);

  \draw[thick,fill=blue!20] (c) -- (b) -- (d) -- (e) -- cycle;
  \draw[thick,postaction={
    decoration={
        markings,
        mark = at position 0.7 with \coordinate (y);
    },
    decorate
  }] (a) -- (c);
  \draw[thick,red,dashed] (x) -- (y);

  \node[above = 10ex of singularity,red] (sn) {singularity};
  \draw[red,->] (sn) -- ($(singularity)+(0,1)$);
  \ExtractCoordinate{x};
  \node[above] at (\XCoord,\YCoord) {%
  (\pgfmathparse{\XCoord*1pt/1cm}\pgfmathprintnumber{\pgfmathresult}\,cm,%
  \pgfmathparse{\YCoord*1pt/1cm}\pgfmathprintnumber[fixed,precision=2]{\pgfmathresult}\,cm)};
\end{tikzpicture}
\end{document}