我正在寻求一些帮助以获得比我的代码目前的更好的格式：请参见下面的丑陋图片。
- 我希望蓝线与“它的”平行边缘平行。
- 我还希望蓝线与“其”平行边缘的距离相同。
有可能吗？ 是否有(半)自动解决方案可以完成所有这些操作？
\documentclass[12pt,a4paper]{article}
\usepackage{forest}
\useforestlibrary{linguistics}
\forestset{
declare count = {connections}{1},
}
\begin{document}
\begin{forest}
for tree = {%
sn edges,
grow' = 0,
l = 2.5cm,
s sep = 1.2cm,
anchor = parent,
},
before typesetting nodes = {%
where connections = 1{}{%
if = {isodd(connections())}{%
edge path' = {%
foreach \i [
count = \j from 0,
evaluate = \noexpand\j
as \noexpand\k
using \noexpand {
(\j == 0) ?
0pt :
((isodd(\j)) ?
(\j*4pt) :
((-\j + 1)*4pt))
}
]
in {%
1, ..., \foresteoption{connections}
}{
(!u.parent anchor)
--
([yshift = \noexpand\k].child anchor)
}
},
}{%
edge path' = {%
foreach \i [
count = \j,
evaluate = \noexpand\j
as \noexpand\k
using {
(isodd(\j)) ?
(\j*4pt) :
((-\j + 1)*4pt)
}
]
in {1,...,\foresteoption{connections}}
{
(!u.parent anchor)
--
([yshift = \noexpand\k].child anchor)
}
},
},
},
},
%%%%
[{}, name = start
[$A$, name = nA
[$B$]
[$C$, name = nC]
]
[$D$,
[$E$]
[$F$]
]
]
\draw[blue,
rounded corners,
dashed,
line width=0.7pt]
(start.90) --
(nA.135) --
(nA.45) --
(nC.45) --
(nC.315) --
(nC.225) --
(nA.315) --
(nA.225) --
(start.315) --
(start.180) --
(start.90);
\end{forest}
\end{document}
答案1
添加与边缘平行的东西并不是很困难，但我怀疑这是否是你真正想要的。
\documentclass[12pt,a4paper]{article}
\usepackage{forest}
\useforestlibrary{linguistics}
\forestset{
declare count = {connections}{1},
}
\tikzset{parallel path/.style args={#1--#2}{insert path={
($(#1)!\pgfkeysvalueof{/tikz/parallel distance}!90:(#2)$)
-- ($(#2)!\pgfkeysvalueof{/tikz/parallel distance}!-90:(#1)$)
}},parallel distance/.initial=1em
}
\begin{document}
\begin{forest}
for tree = {%
sn edges,
grow' = 0,
l = 2.5cm,
s sep = 1.2cm,
anchor = parent,
},
before typesetting nodes = {%
where connections = 1{}{%
if = {isodd(connections())}{%
edge path' = {%
foreach \i [
count = \j from 0,
evaluate = \noexpand\j
as \noexpand\k
using \noexpand {
(\j == 0) ?
0pt :
((isodd(\j)) ?
(\j*4pt) :
((-\j + 1)*4pt))
}
]
in {%
1, ..., \foresteoption{connections}
}{
(!u.parent anchor)
--
([yshift = \noexpand\k].child anchor)
}
},
}{%
edge path' = {%
foreach \i [
count = \j,
evaluate = \noexpand\j
as \noexpand\k
using {
(isodd(\j)) ?
(\j*4pt) :
((-\j + 1)*4pt)
}
]
in {1,...,\foresteoption{connections}}
{
(!u.parent anchor)
--
([yshift = \noexpand\k].child anchor)
}
},
},
},
},
%%%%
[{}, name = start
[$A$, name = nA
[$B$]
[$C$, name = nC]
]
[$D$,
[$E$]
[$F$]
]
]
\path
[parallel path={nA.child anchor--start.parent anchor}]
coordinate[pos=0] (p0) coordinate[pos=1] (p1)
[parallel path={start.parent anchor--nA.child anchor}]
coordinate[pos=0] (p2) coordinate[pos=1] (p3)
[parallel path={nA.parent anchor--nC.child anchor}]
coordinate[pos=0] (p4) coordinate[pos=1.1] (p5)
[parallel path={nC.child anchor--nA.parent anchor}]
coordinate[pos=-0.1] (p6) coordinate[pos=1] (p7)
;
\draw[blue,dashed,line width=0.7pt]
let \p1=($(p0)-(p1)$),
\p2=($(p4)-(p5)$),
\n1={atan2(\y1,\x1)},
\n2={atan2(\y2,\x2)},
\n3={\pgfkeysvalueof{/tikz/parallel distance}} in
(p0) -- (p1) arc[start angle=\n1-90,end angle=\n1-270,radius=\n3]
-- (p3) to[out=\n1,in=\n2] (p4) -- (p5)
arc[start angle=\n2-90,end angle=\n2-270,radius=\n3]
-- (p7) to[out=\n2,in=\n1] cycle;
\end{forest}
\end{document}
显然，问题出C在锚点的东边，而不仅仅是边缘的下方。
你的大部分代码都没有用到，如果一个人放弃，那么sn edges边缘就会很好，一个人会得到
\documentclass[12pt,a4paper]{article}
\usepackage{forest}
\tikzset{parallel path/.style args={#1--#2}{insert path={
($(#1)!\pgfkeysvalueof{/tikz/parallel distance}!90:(#2)$)
-- ($(#2)!\pgfkeysvalueof{/tikz/parallel distance}!-90:(#1)$)
}},parallel distance/.initial=1em
}
\begin{document}
\begin{forest}
for tree = {%
grow' = 0,
l = 2.5cm,
parent anchor=east,
s sep = 1.2cm,
},
[{}, name = start,anchor=east
[$A$, name = nA
[$B$]
[$C$, name = nC]
]
[$D$,
[$E$]
[$F$]
]
]
\path
[parallel path={nA.child anchor--start.parent anchor}]
coordinate[pos=0.2] (p0) coordinate[pos=1] (p1)
[parallel path={start.parent anchor--nA.child anchor}]
coordinate[pos=0] (p2) coordinate[pos=1] (p3)
[parallel path={nA.parent anchor--nC.child anchor}]
coordinate[pos=0] (p4) coordinate[pos=1.02] (p5)
[parallel path={nC.child anchor--nA.parent anchor}]
coordinate[pos=-0.02] (p6) coordinate[pos=0.8] (p7)
;
\draw[blue,dashed,line width=0.7pt]
let \p1=($(p0)-(p1)$),
\p2=($(p4)-(p5)$),
\n1={atan2(\y1,\x1)},
\n2={atan2(\y2,\x2)},
\n3={\pgfkeysvalueof{/tikz/parallel distance}} in
(p0) -- (p1) arc[start angle=\n1-90,end angle=\n1-270,radius=\n3]
-- (p3) to[out=\n1,in=\n2] (p4) -- (p5)
arc[start angle=\n2-90,end angle=\n2-270,radius=\n3]
-- (p7) to[out=\n2,in=\n1] cycle;
\end{forest}
\end{document}
