我已經成功地產生了一個漂亮的圖表，但想添加一個「循環」來放大我創建的特定閾值（第 95 個百分位）。在縮放圖片中，我希望能夠添加文字（以顯示 x 和 y 的值），這可能嗎？在下面，我設置了一個插圖，我希望它看起來像什麼，程式碼位於底部（抱歉資料點的數量）。
\usepackage{pgfplots, pgfplotstable}
\usetikzlibrary{spy}
\begin{figure}[h]
\caption{x}
\label{DistributionFirmVisitors}
\begin{center}
\begin{tikzpicture}[spy using outlines={rectangle, magnification=3,connect spies}]
\begin{axis}[width=12cm,height=7cm,
ylabel={Cumulative \% of EDGAR visitors},
xlabel={\# of unique firms},
xmin=-20,
xmax=1000,
ymin=0.6,
ymax=1,
xtick={1, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000},
ytick={0.3,0.4,0.5,0.6,0.7,0.8,0.9,1},
tick label style={/pgf/number
format/precision=5},
scaled y ticks = false,
legend pos=north east,
grid style=dashed,
every axis plot/.append style={thick},
axis background/.style={fill=gray!5},
xtick pos=bottom,ytick pos=left
]
\addplot[
color=black,
]
coordinates {
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};
\addplot[mark=none, red, dashed, style=thin]
coordinates {
(12, 0.951575349748817)
(12, 0)
};
\addplot[color=red, mark=none, dashed, style=thin] coordinates {(-20,0.951575349748817) (12,0.951575349748817)};
\end{axis}
\end{tikzpicture} \\
\end{center}
\end{figure} \vspace{0.4cm}
答案1
這個答案只是顯示了一些小的改進土撥鼠已經很好的答案。我定義要放大的座標第一的然後使用該座標添加紅色虛線，放置「間諜」節點並在放大倍率下方寫入放大點的座標。 （我還決定將坐標文本放置在以下放大倍率，因為這樣就沒有任何重疊。
更多細節請查看程式碼註解。
% used PGFPlots v1.16
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
\usetikzlibrary{spy}
% ---------------------------------------------------------------------
% Coordinate extraction
% (see <https://tex.stackexchange.com/a/426245/95441>)
% #1: node name
% #2: output macro name: x coordinate
% #3: output macro name: y coordinate
\newcommand{\Getxycoords}[3]{%
\pgfplotsextra{%
% using `\pgfplotspointgetcoordinates' stores the (axis)
% coordinates in `data point' which then can be called by
% `\pgfkeysvalueof' or `\pgfkeysgetvalue'
\pgfplotspointgetcoordinates{(#1)}%
% `\global' (a TeX macro and not a TikZ/PGFPlots one) allows to
% store the values globally
\global\pgfkeysgetvalue{/data point/x}{#2}%
\global\pgfkeysgetvalue{/data point/y}{#3}%
}%
}
% ---------------------------------------------------------------------
\begin{document}
\begin{tikzpicture}
% Because we need to give the spy node a name to add the labels afterwards,
% it is a bit more complicate than usual. To do so we need to `scope` the
% spy. To avoid further error messages it seems we need to `scope` the whole
% `axis` environment.
\begin{scope}[
% Give the spy options to the `scope`
spy using outlines={
rectangle,
magnification=3,
connect spies,
size=3cm,
blue,
},
]
\begin{axis}[
width=12cm,
height=7cm,
ylabel={Cumulative \% of EDGAR visitors},
xlabel={\# of unique firms},
xmin=-20,
xmax=1000,
ymin=0.6,
ymax=1,
% (simplified this statement)
xtick={1,100,200,...,1000},
% (removed all unnecessary/unrelated stuff)
]
% (simplified the plot by removing a lot of coordinates and adding
% `smooth` to the options
\addplot [thick,smooth] coordinates {
(1,0.690799792067144)
(3,0.863918774952765)
(5,0.907403411140743)
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(139,0.990231580495251)
};
% crate a coordinate of the point you want to magnify
\coordinate (point) at (axis cs:12,0.951575349748817);
% Get the coordinates of that point (to later use them)
\Getxycoords{point}{\PointX}{\PointY}
% draw the dashed lines to the axis (using the defined coordinate)
\draw [red,dashed]
(point -| {axis cs:\pgfkeysvalueof{/pgfplots/xmin},0})
-| ({axis cs:0,\pgfkeysvalueof{/pgfplots/ymin}} -| point);
% unfortunately one cannot directly place the spy at an
% axis coordinate, thus we define a `\coordinate` first
\coordinate (spy point) at (axis cs:400,0.8);
\spy on (point) in node (spy) at (spy point);
\end{axis}
\end{scope}
% add the labels below the spy node
\node [anchor=north] at (spy.south) {%
$x = \pgfmathprintnumber{\PointX}$,
$y = \pgfmathprintnumber{\PointY}$%
};
\end{tikzpicture}
\end{document}
答案2
請在未來問題的程式碼中加入適當的序言。
\documentclass[tikz,border=3.14mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\usetikzlibrary{spy}
\begin{document}
\begin{tikzpicture}
\begin{scope}[spy using outlines={rectangle, magnification=3,
width=3cm,height=4cm,connect spies}]
\begin{axis}[width=12cm,height=7cm,
ylabel={Cumulative \% of EDGAR visitors},
xlabel={\# of unique firms},
xmin=-20,
xmax=1000,
ymin=0.6,
ymax=1,
xtick={1, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000},
ytick={0.3,0.4,0.5,0.6,0.7,0.8,0.9,1},
tick label style={/pgf/number
format/precision=5},
scaled y ticks = false,
legend pos=north east,
grid style=dashed,
every axis plot/.append style={thick},
axis background/.style={fill=gray!5},
xtick pos=bottom,ytick pos=left
]
\addplot[
color=black,
]
coordinates {
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};
\addplot[mark=none, red, dashed, style=thin]
coordinates {(-20,0.951575349748817)
(12, 0.951575349748817)
(12, 0)
};
\path (12, 0.951575349748817) coordinate (X);
\end{axis}
\spy [red] on (X) in node (zoom) [left] at ([xshift=8cm,yshift=-2cm]X);
\end{scope}
\node[anchor=south,fill=gray!5] at (zoom.south) {$x=12,y=0.95$};
\end{tikzpicture}
\end{document}
