无法使用 \clip 命令突出显示椭圆和直线的交点部分，

Question

无法使用\clip命令突出显示椭圆和线的交点部分，请帮忙。这里我想填充区域 ABCD，请指导，谢谢

\documentclass{article}
\usepackage{tikz,pgfplots}
%\usepackage[x11names]{xcolor}
\usepackage{tikz}
\usetikzlibrary{intersections}
\usepackage{pgfplots}\pgfplotsset{compat=newest}
\pgfdeclarelayer{bg}    % declare background
\pgfsetlayers{bg,main}  % order of layers (main = standard layer)
\pgfplotsset{compat=1.13}
\usepackage{amsmath}
\usetikzlibrary{positioning}





\begin{document}

\begin{tikzpicture}
\draw (0,-2)--(0,3); 
\draw (-4,0)--(5,0);
\draw (0,0)node(o){O} (0,1)[left]node(c){C} (0,-1)node(d){D};
\draw(0,0)circle[x radius = 3 cm , y radius = 1 cm]; % DRAW ELLIPSE
\draw (1,-1)[below]node(a){A}--(1,1)[above]node(b){B};
\clip(0,0)circle[x radius = 3 cm , y radius = 1 cm];
\fill[black] (0cm,0cm) rectangle (4cm,6cm);
\draw (0,0)node(o){O} (0,1)[left]node(c){C};

\end{tikzpicture}
\end{document}

Answer 1

您想要这样的东西吗？您没有得到任何可见结果的原因是您填充了一个零宽度的矩形。

\documentclass{article} 
\usepackage{tikz} 
\begin{document}
\begin{tikzpicture} 
\draw (0,-2)--(0,3); 
\draw (-4,0)--(5,0);
\draw(0,0)circle[x radius = 3 cm , y radius = 1 cm]; % DRAW ELLIPSE 
\draw (1,-1)[below]node(a){A}--(1,1)[above]node(b){B}; 
\clip(0,0)circle[x radius = 3 cm , y radius = 1 cm]; 
\draw[blue,thick] (a) -- (b);
\end{tikzpicture} 
\end{document}

至于您更新的问题，您将点a、b和定义c为d节点，它们是扩展对象。这就是为什么连接这些点的路径有间隙，例如fill会失败。为避免这种情况，请使用coordinate带标签的类型节点。

\documentclass{article} 
\usepackage{tikz} 
\pgfdeclarelayer{bg}   
\pgfsetlayers{bg,main}
\begin{document}
\begin{tikzpicture} 
 \draw (0,-2) -- (0,3); 
 \draw (-4,0) -- (5,0);
 \draw (0,0)circle[x radius = 3 cm , y radius = 1 cm]; % DRAW ELLIPSE 
 \draw (1,-1)coordinate[label=below:$A$](a) 
     -- (1,1)coordinate[label=above:$B$](b); 
 \draw (0,0)coordinate[label=below left:$O$](o) 
     (0,1)coordinate[label=left:$C$](c)
     (0,-1)coordinate[label=below:$D$](d);
 \begin{pgfonlayer}{bg} 
  \clip (0,0) circle[x radius = 3 cm , y radius = 1 cm]; 
  \fill[blue] (a) -- (b) -- (c) -- (d) -- cycle;
 \end{pgfonlayer}
\end{tikzpicture} 
\end{document}