☰

使用 pgfplots 绘制不平等区域

tag-icon • tag-icon pgfplots
使用 pgfplots 绘制不平等区域

我正在尝试绘制平面的某个区域，但我找不到方法。

它看起来应该是这样的：

在此处输入图片描述

此外，如果有办法改变该区域的绘画，使其像所画的那样，那就完美了，这里是代码：

\documentclass{article}
\usepackage[utf8]{inputenc} 
\usepackage{tikz}  
\usepackage{mathtools}  
\usepackage[siunitx, american]{circuitikz} 
\usepackage{enumitem}   
\usepackage{amsmath}
\usepackage{paracol}
\usepackage{siunitx}
\usetikzlibrary{shapes,arrows}    
\usepackage{titling} 
\usepackage{changepage}  
\usepackage{float} 
\usepackage{geometry}   
\usepackage{xfrac}  
\usepackage{pgfplots}  
\usepackage{tikz} 
\usepackage{pst-plot}
\usetikzlibrary{shapes,arrows}
\usepgfplotslibrary{fillbetween}  
\usetikzlibrary{patterns}  

\begin{document} 

\begin{figure}[H] \centering
\begin{tikzpicture} 
\begin{axis} [xmin = -0.7, xmax = 1.7, ymin = -1.5, ymax = 1.5, xlabel =$\phi_1$, ylabel =$\phi_2$, axis lines = middle,width = 8cm, height=7cm , title = Constelación de Señales, ytick distance = 3, xtick distance = 5]

    \node[label={180:{(0,$\sqrt{T}$)}},circle,fill,inner sep=2pt] at (axis cs:0,1) {}; 
    \node[label={},circle,fill,inner sep=2pt] at (axis cs:1,0) {}; 
    \node [above = 1mm] at (axis cs:1,0) {($\sqrt{T}$,0)}; 
    \node[label={180:{(0,$-\sqrt{T}$)}},circle,fill,inner sep=2pt] at (axis cs:0,-1) {}; 

    \addplot +[const plot, no marks, black] 
    coordinates{(0,0) (-0.7,0)};  
    \addplot[name path=b, domain=0:1.7] {x} \closedcycle node at (current path bounding box.center) {};  
    \addplot[name path=a, domain=0:1.7] {-x} \closedcycle node at (current path bounding box.center) {};
    \addplot[gray!30] fill between[of=b and a]; 
    \path[name path=axisl] (axis cs:-1,0) -- (axis cs:0,0); 




\end{axis}
\end{tikzpicture}
\end{figure}  


\end{document}

答案1

只需添加一些图案。

\documentclass{article}
\usepackage[utf8]{inputenc} 
\usepackage{pgfplots}  
\pgfplotsset{compat=1.16}
\usepgfplotslibrary{fillbetween}  
\usetikzlibrary{patterns.meta}
\begin{document} 

\begin{figure} \centering
\begin{tikzpicture} 
\begin{axis} [xmin = -0.7, xmax = 1.7, ymin = -1.5, ymax = 1.5, xlabel
=$\phi_1$, ylabel =$\phi_2$, axis lines = middle,width = 8cm, height=7cm , title
= Constelaci\'on de Se\~nales, ytick distance = 3, xtick distance = 5]
    \path[pattern={Lines[angle=45,distance={3pt/sqrt(2)}]},pattern color=blue]
     (\pgfkeysvalueof{/pgfplots/xmin},0) -- (0,0) --
     (\pgfkeysvalueof{/pgfplots/xmax},\pgfkeysvalueof{/pgfplots/xmax}) -| cycle;
    \path[pattern={Lines[angle=-45,distance={3pt/sqrt(2)}]},pattern color=blue]
    (\pgfkeysvalueof{/pgfplots/xmin},0) -- (0,0) --
    (\pgfkeysvalueof{/pgfplots/xmax},-\pgfkeysvalueof{/pgfplots/xmax}) -| cycle;

    \node[label={180:{(0,$\sqrt{T}$)}},circle,fill,inner sep=2pt] at (axis cs:0,1) {}; 
    \node[label={},circle,fill,inner sep=2pt] at (axis cs:1,0) {}; 
    \node [above = 1mm] at (axis cs:1,0) {($\sqrt{T}$,0)}; 
    \node[label={180:{(0,$-\sqrt{T}$)}},circle,fill,inner sep=2pt] at (axis cs:0,-1) {}; 

    \addplot +[const plot, no marks, black] 
    coordinates{(0,0) (-0.7,0)};  
    \addplot[name path=b, domain=0:1.7] {x} \closedcycle node at (current path bounding box.center) {};  
    \addplot[name path=a, domain=0:1.7] {-x} \closedcycle node at (current path bounding box.center) {};
    \addplot[gray!30] fill between[of=b and a]; 
    \path[name path=axisl] (axis cs:-1,0) -- (axis cs:0,0); 
\end{axis}
\end{tikzpicture}
\end{figure}  
\end{document}

在此处输入图片描述

从语法上可以明显看出如何改变这些线的颜色、密度和斜率。

另外，我恳请您不要将不相关的包添加到 MWE 的序言中，也不要加载两次包。

相关内容