![使用 3d tikz 库的交叉点顺序问题](https://linux22.com/image/358319/%E4%BD%BF%E7%94%A8%203d%20tikz%20%E5%BA%93%E7%9A%84%E4%BA%A4%E5%8F%89%E7%82%B9%E9%A1%BA%E5%BA%8F%E9%97%AE%E9%A2%98.png)
我想按特定顺序获取两条路径之间的交点。
当这些路径被绘制成2D图片时,一切都很好。
但是由于某种原因,当我使用该库绘制相同的图形时,3d
尽管有键,但交叉点的顺序会发生变化sort by
。
有人知道如何在 3D 情况下获得正确的顺序吗?
梅威瑟:
\documentclass[tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{3d, intersections}
\begin{document}
% 2D picture : order of intersections is OK
\begin{tikzpicture}
\draw[red, name path = structure] (3,-1)coordinate(A) -- (3,1) -- (1,1)coordinate(B) -- (0,0) -- (2,0) -- (3,1);
\draw[blue,->, name path = line] (A) -- (B);
\draw [name intersections={of=structure and line, name=i, sort by=line}] (i-1) node{+}node[below]{1} (i-2) node{+}node[below]{2} (i-3) node{+}node[below]{3};
\end{tikzpicture}
% 3D picture : order of intersections is weird
\begin{tikzpicture}[x = {(1cm,0cm)}, y = {(0.5cm,0.5cm)}, z = {(0cm,1cm)}]
\draw[red, name path = structure] (2,2,0)coordinate(A) -- ++(0,0,2) --++(-2,0,0)coordinate(B) --++(0,-2,0) --++(2,0,0) --++(0,2,0);
\draw[blue,->, name path = line] (A) -- (B);
\draw [name intersections={of=structure and line, name=i, sort by=line}] (i-1) node{+}node[below]{1} (i-2) node{+}node[below]{2} (i-3) node{+}node[below]{3};
\end{tikzpicture}
\end{document}
2D图片:
3D图片:
答案1
在我看来,这与 3d 无关,但事实是,按照用语法绘制的直线进行排序,--
结果有点像彩票。这已在这个问题,为了解决这个问题,你可以画一条假装是曲线的直线。
\documentclass[tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{3d, intersections}
\begin{document}
% 2D picture : order of intersections is OK
\begin{tikzpicture}
\draw[red, name path = structure] (3,-1)coordinate(A) -- (3,1) -- (1,1)coordinate(B) -- (0,0) -- (2,0) -- (3,1);
\draw[blue,->, name path = line] (A) -- (B);
\draw [name intersections={of=structure and line, name=i, sort by=line}] (i-1) node{+}node[below]{1} (i-2) node{+}node[below]{2} (i-3) node{+}node[below]{3};
\end{tikzpicture}
% 3D picture : order of intersections is weird
\begin{tikzpicture}[x = {(1cm,0cm)}, y = {(0.5cm,0.5cm)}, z = {(0cm,1cm)}]
\draw[red, name path = structure] (2,2,0)coordinate(A) -- ++(0,0,2) --++(-2,0,0)coordinate(B) --++(0,-2,0) --++(2,0,0) --++(0,2,0);
\draw[blue,->, name path = line] (A) to[bend left=0] (B);
\draw [name intersections={of=structure and line, name=i, sort by=line}] (i-1) node{+}node[below]{1} (i-2) node{+}node[below]{2} (i-3) node{+}node[below]{3};
\end{tikzpicture}
\end{document}