TikZ：帮助协调网格线

Question

在创建 tikz 图片时，我经常认为显示这样的坐标网格会很有用 在我的图片背景中以对齐某些点、线等。

我发现这个问题其中描述了多种绘制网格的方法，但每种方法都需要明确指定网格的大小。
但是我希望网格能够自动覆盖整个图像背景，而无需在向图像添加另一个点时调整其大小。

翻阅手册后，我发现backgrounds库中有一个选项 ( gridded)，几乎符合我的需求。唯一缺少的是坐标标签。

\documentclass[12pt]{article}
\usepackage{tikz}
\usetikzlibrary{backgrounds}

\begin{document}

    \begin{tikzpicture}[gridded]
        \draw[red] (-1,0.7) -- (5,-2.3);
    \end{tikzpicture}

\end{document}

生产

我的问题是：如何向此网格添加坐标标签？
如果有人可以告诉我如何获取图像边界（即包含当前图像的矩形），那么添加坐标标签应该相当简单...

Answer 1

只需将@Martin Scharrer 的序言粘贴到您的示例中，并将[gridded]选项对齐到[show grid = true]

\documentclass[12pt]{article}
\usepackage{tikz}
\usetikzlibrary{backgrounds}
% \usetikzlibrary{showgrid}

\makeatletter
\newif\if@showgrid@grid
\newif\if@showgrid@left
\newif\if@showgrid@right
\newif\if@showgrid@below
\newif\if@showgrid@above
\tikzset{%
    every show grid/.style={},
    show grid/.style={execute at end picture={\@showgrid{grid=true,#1}}},%
    show grid/.default={true},
    show grid/.cd,
    labels/.style={font={\sffamily\small},help lines},
    xlabels/.style={},
    ylabels/.style={},
    keep bb/.code={\useasboundingbox (current bounding box.south west) rectangle (current bounding box.north west);},
    true/.style={left,below},
    false/.style={left=false,right=false,above=false,below=false,grid=false},
    none/.style={left=false,right=false,above=false,below=false},
    all/.style={left=true,right=true,above=true,below=true},
    grid/.is if=@showgrid@grid,
    left/.is if=@showgrid@left,
    right/.is if=@showgrid@right,
    below/.is if=@showgrid@below,
    above/.is if=@showgrid@above,
    false,
}

\def\@showgrid#1{%
    \begin{scope}[every show grid,show grid/.cd,#1]
    \if@showgrid@grid
    \begin{pgfonlayer}{background}
    \draw [help lines]
        (current bounding box.south west) grid
        (current bounding box.north east);
%
    \pgfpointxy{1}{1}%
    \edef\xs{\the\pgf@x}%
    \edef\ys{\the\pgf@y}%
    \pgfpointanchor{current bounding box}{south west}
    \edef\xa{\the\pgf@x}%
    \edef\ya{\the\pgf@y}%
    \pgfpointanchor{current bounding box}{north east}
    \edef\xb{\the\pgf@x}%
    \edef\yb{\the\pgf@y}%
    \pgfmathtruncatemacro\xbeg{ceil(\xa/\xs)}
    \pgfmathtruncatemacro\xend{floor(\xb/\xs)}
    \if@showgrid@below
    \foreach \X in {\xbeg,...,\xend} {
        \node [below,show grid/labels,show grid/xlabels] at (\X,\ya) {\X};
    }
    \fi
    \if@showgrid@above
    \foreach \X in {\xbeg,...,\xend} {
        \node [above,show grid/labels,show grid/xlabels] at (\X,\yb) {\X};
    }
    \fi
    \pgfmathtruncatemacro\ybeg{ceil(\ya/\ys)}
    \pgfmathtruncatemacro\yend{floor(\yb/\ys)}
    \if@showgrid@left
    \foreach \Y in {\ybeg,...,\yend} {
        \node [left,show grid/labels,show grid/ylabels] at (\xa,\Y) {\Y};
    }
    \fi
    \if@showgrid@right
    \foreach \Y in {\ybeg,...,\yend} {
        \node [right,show grid/labels,show grid/ylabels] at (\xb,\Y) {\Y};
    }
    \fi
    \end{pgfonlayer}
    \fi
    \end{scope}
}
\makeatother
%\tikzset{showgrid} % would enable it globally
\tikzset{every show grid/.style={show grid/keep bb}}%  Keep the original bounding box!


\begin{document}

    \begin{tikzpicture}[show grid = true]
        \draw[red] (-1,0.7) -- (5,-2.3);
    \end{tikzpicture}

\end{document}

其结果为——