我想在PGF/TikZ中展示一个球以说明大圆的概念。
当前结果的代码为:
当前结果的代码为:
\begin{tikzpicture}
\tikzfading[name=fade right,
left color=transparent!20,
right color=transparent!90]
\tikzfading[name=fade out,
inner color=transparent!100,
outer color=transparent!10]
\tikzfading[name=fade right gc,
left color=transparent!0,
right color=transparent!70]
\draw [<->, dashed] (0,-5) -- (0,5); % y-axis
\draw [->, dashed] (0, 0) -- (20:5); % x-axis
\draw [->, dashed] (0, 0) -- (200:5); % x-axis
\draw [->, dashed] (0, 0) -- (340:5); % z-axis
\draw [->, dashed] (0, 0) -- (160:5); % z-axis
\fill [color=cyan, opacity=0.15, path fading=fade out] (0,0) circle (4cm); % bounding circle
\fill [color=cyan, opacity=0.25, path fading=fade right, fading angle=90] (0,0) ellipse (4cm and 1cm); % x-y-axis area
% great circle 1
\draw [rotate=-40, color=red, path fading=fade right gc, fading angle=40] (0,0) ellipse (4cm and 1cm);
% great circle 2
\draw[rotate=5, color=red, path fading=fade right gc, fading angle=5] (0,0) ellipse (1.5cm and 4cm);
\end{tikzpicture}
我该如何
- 找到两个红色椭圆(标记为“大圆1”和“大圆2”)的交点,
- 找到一条直线(起点为中心(0,0))与一个椭圆的交点,并且
- 在那里放置一个小圆或矩形?
在那里放置一个小圆或矩形不是问题。 非常感谢!