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在图形上画一个圆圈 Latex

tag-icon • tag-icon tikz-pgf graphics
在图形上画一个圆圈 Latex

我尝试修改此代码以获得一个带有坐标的圆形而不是矩形。

\documentclass[11pt,a4paper]{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
    \node[anchor=south west,inner sep=0] (image) at (0,0) {\includegraphics[width=0.9\textwidth]{matlab.png}};
    \begin{scope}[x={(image.south east)},y={(image.north west)}]
        \draw[help lines,xstep=.1,ystep=.1] (0,0) grid (1,1);
        \foreach \x in {0,1,...,9} { \node [anchor=north] at (\x/10,0) {0.\x}; }
        \foreach \y in {0,1,...,9} { \node [anchor=east] at (0,\y/10) {0.\y}; }
        \draw[red,ultra thick] (0.62,0.65) rectangle (0.78,0.75);
    \end{scope}
\end{tikzpicture}

\end{document}

你有什么想法 ？

答案1

在此处输入图片描述

\documentclass[11pt,a4paper]{article}
\usepackage{tikz}

\begin{document}
    
    \begin{tikzpicture}
        \node[anchor=south west,inner sep=0] (image) at (0,0) {\includegraphics[width=0.9\textwidth]{example-image}};
        \begin{scope}[x={(image.south east)},y={(image.north west)}]
            \draw[help lines,xstep=.1,ystep=.1] (0,0) grid (1,1);
            \foreach \x in {0,1,...,9} { \node [anchor=north] at (\x/10,0) {0.\x}; }
            \foreach \y in {0,1,...,9} { \node [anchor=east] at (0,\y/10) {0.\y}; }
            \draw[red,ultra thick] (0.62,0.65) circle (1cm);
        \end{scope}
    \end{tikzpicture}
    
\end{document}

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