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放大图表的某一部分

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放大图表的某一部分

尝试放大图表的一部分，但一直出现错误。不知道哪里出错了。如能提供任何帮助，我将不胜感激。

错误弹出：

尺寸太大。\pgf@xx \end{loglogaxis}

\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{spy}
\begin{document}
\centering
\begin{tikzpicture}[spy using outlines=
{circle, magnification=4, connect spies}]
    \begin{loglogaxis}[x post scale=2, y post scale=1.5,xlabel=Reynolds Number,ylabel=Ohnesorge number, xmin=10^0, xmax=10^5, ymin=10^-3, ymax=10^1, grid=major, grid=minor]
\addlegendentry{1/4 Lift}
 \addplot[color=black, mark=x, only marks] coordinates{
 (6485.41491,   0.003317065)
 (7927.942858,  0.003317065)
 (8663.115504,  0.003317065)
 (9219.462371,  0.003317065)
 (9537.374867,  0.003317065)
 (10491.11235,  0.003317065)
 (11087.19828,  0.003317065)
 (12219.76155,  0.003317065)
};
\addlegendentry{1/2 Lift}
 \addplot[color=yellow, mark=o, only marks] coordinates{
(6556.945221,   0.003317065)
(7868.334265,   0.003317065)
(8663.115504,   0.003317065)
(9187.671122,   0.003317065)
(9120.114717,   0.003317065)
(10443.42548,   0.003317065)
(11683.28421,   0.003317065)
(12875.45607,   0.003317065)

};
\coordinate (spypoint) at (10^4,10^-2);
\coordinate (magnifyglass) at (10^2,10^-1);
    \end{loglogaxis}%
    \spy [blue, size=1.5cm] on (spypoint)
in node[fill=white] at (magnifyglass);
\end{tikzpicture}%
\caption{Oh vs Re for straight nozzle}
\end{document}

在此处输入图片描述

答案1

添加axis cs:到坐标，即写入

\coordinate (spypoint) at (axis cs:10^4,10^-2);
\coordinate (magnifyglass) at (axis cs:10^2,10^-1);

如果没有此前缀，tikz 会尝试将spypoint原点定位在东边 10000 厘米处和北边 0.01 厘米处。如果使用此前缀，tikz 会将给定的坐标转换为与绘图坐标相同的方式，这里甚至是对数方式。（cs 代表坐标系。）

在此处输入图片描述

\documentclass[border=2pt]{standalone}
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{spy}
\begin{document}
\centering
\begin{tikzpicture}[spy using outlines=
{circle, magnification=4, connect spies}]
    \begin{loglogaxis}[x post scale=2, y post scale=1.5,xlabel=Reynolds Number,ylabel=Ohnesorge number, xmin=10^0, xmax=10^5, ymin=10^-3, ymax=10^1, grid=major, grid=minor]
\addlegendentry{1/4 Lift}
 \addplot[color=black, mark=x, only marks] coordinates{
 (6485.41491,   0.003317065)
 (7927.942858,  0.003317065)
 (8663.115504,  0.003317065)
 (9219.462371,  0.003317065)
 (9537.374867,  0.003317065)
 (10491.11235,  0.003317065)
 (11087.19828,  0.003317065)
 (12219.76155,  0.003317065)
};
\addlegendentry{1/2 Lift}
 \addplot[color=yellow, mark=o, only marks] coordinates{
(6556.945221,   0.003317065)
(7868.334265,   0.003317065)
(8663.115504,   0.003317065)
(9187.671122,   0.003317065)
(9120.114717,   0.003317065)
(10443.42548,   0.003317065)
(11683.28421,   0.003317065)
(12875.45607,   0.003317065)

};
\coordinate (spypoint) at (axis cs:10^4,10^-2);
\coordinate (magnifyglass) at (axis cs:10^2,10^-1);
    \end{loglogaxis}%
    \spy [blue, size=1.5cm] on (spypoint)
 in node[fill=white] at (magnifyglass);
\end{tikzpicture}%
\end{document}

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