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使用 tikz 注释图片并定位

tag-icon • tag-icon tikz-pgf
使用 tikz 注释图片并定位

我正在用 tikz 注释图片。

我努力了

\documentclass[tikz]{standalone}

\usetikzlibrary{shapes,arrows,positioning,decorations.pathreplacing}

\begin{document}

\tikzset{%
    box/.style = {red, thick, rounded corners},
    arrow/.style = {->, green, ultra thick},
}

\begin{tikzpicture}[node distance=0.1cm, auto]
    % image
    \node[anchor=south west,inner sep=0] (image) at (0,0) {%
        \includegraphics[width=0.9\textwidth]{img/navbar.PNG}
    };

    % annotate
    \begin{scope}[x={(image.south east)},y={(image.north west)}]
        \draw[box] (0.02,0.15) rectangle (0.1,0.9);
        \node at (-0.02,-1) {Home};
        \draw[arrow] (0,-0.8) -- (0.02,0.15);
    \end{scope}
\end{tikzpicture}

\end{document}

我的代码可以运行，但我手动放置了带有文本“Home”的节点。我必须绘制多个框，每个框中都有文本。我还想要一个从文本到文本所属框的箭头。

我可以使用一些定位魔法吗？我曾尝试命名绘制的矩形，\draw[box] (home) (0.02,0.15) rectangle (0.1,0.9);但显然不允许像命名节点那样命名矩形。

答案1

您可以在矩形的一角添加coordinate，使用语法绘制一条相对于此端点的线++(x,y)，并Home在线的末端添加节点。根据shorten <您的喜好调整 的值。

在此处输入图片描述

\documentclass[tikz,border=3mm]{standalone}

\usetikzlibrary{shapes,arrows,positioning,decorations.pathreplacing}

\begin{document}

\tikzset{%
    box/.style = {red, thick, rounded corners},
    arrow/.style = {->, green, ultra thick},
}

\begin{tikzpicture}[node distance=0.1cm, auto]
    % image
    \node[anchor=south west,inner sep=0] (image) at (0,0) {%
        \includegraphics[width=0.9\textwidth]{example-image}
    };

    % annotate
    \begin{scope}[x={(image.south east)},y={(image.north west)}]
        \draw[box] (0.02,0.15) coordinate(box1) rectangle (0.1,0.9);
        \draw [arrow,shorten <=1pt] (box1) -- ++(-0.1,-0.7) node[below,black]{Home};
    \end{scope}
\end{tikzpicture}

\end{document}

答案2

只是为了好玩，我创建了一个宏来根据节点的角生成一个节点。这实际上会给你一个带有锚点的框。

\documentclass[tikz]{standalone}
\usepackage{mwe}% for example=image

\usetikzlibrary{shapes,arrows,positioning,decorations.pathreplacing,calc}

\newlength{\boxnodewidth}
\newlength{\boxnodeheight}

\newcommand{\boxnode}[4][\empty]% #1=parms (aptional), #2 = name, #3=SE corner x,y, #4=NW corner x,y
{\coordinate (boxnodecornerse) at (#3);
 \coordinate (boxnodecornernw) at (#4);
 \pgfextractx{\boxnodewidth}{\pgfpointdiff{\pgfpointanchor{boxnodecornerse}{center}}%
   {\pgfpointanchor{boxnodecornernw}{center}}}%
 \pgfextracty{\boxnodeheight}{\pgfpointdiff{\pgfpointanchor{boxnodecornerse}{center}}%
   {\pgfpointanchor{boxnodecornernw}{center}}}%
 \node[minimum width=\boxnodewidth,minimum height=\boxnodeheight,inner sep=0pt,#1] (#2) at ($(boxnodecornerse)!.5!(boxnodecornernw)$) {};
}

\begin{document}

\tikzset{%
    box/.style = {red, thick, rounded corners},
    arrow/.style = {->, green, ultra thick},
}

\begin{tikzpicture}[node distance=0.1cm, auto]
    % image
    \node[anchor=south west,inner sep=0] (image) at (0,0) {%
        \includegraphics[width=0.9\textwidth]{example-image}
    };

    % annotate
    \begin{scope}[x={(image.south east)},y={(image.north west)}]
        \boxnode[draw=red,rounded corners]{box}{0.02,0.15}{0.1,0.9}
        %\draw[box] (0.02,0.15) rectangle (0.1,0.9);
        \draw[arrow] (box.north) -- ++(0,1cm) node[black,above]{Home};
    \end{scope}
\end{tikzpicture}

\end{document}

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