我有这个代码
\PassOptionsToPackage{rgb,svgnames,dvipsnames,x11names}{xcolor}
\documentclass[border=10pt,tikz]{standalone}
\usepackage{forest}
\usepackage{chemformula}
\forestset{% this specifies a style, direction switch, which manages the layout, formatting and tweaking of the various levels and nodes of the tree itself
direction switch/.style={
for tree={l sep=-10em,
draw=DodgerBlue2,
thick,
inner ysep=2pt,
edge={thick},
if level=1{% the root node is level 0 so this is the layer of horizontally aligned nodes beneath it
parent anchor=south,
child anchor=north,
edge path={
\noexpand\path [draw, \forestoption{edge}] (!u.parent anchor) -- ++(0,-.5em) -| (.child anchor)\forestoption{edge label};
},
for descendants={% apply to everything beneath level 1
child anchor=west,
align=left,
edge path={
\noexpand\path [draw, \forestoption{edge}] (!u.parent anchor) ++(1em,0) |- (.child anchor)\forestoption{edge label};
},
s sep+=1.5pt,
fit=band,
},
for tree={% apply to everything in level 1 or beneath level 1
parent anchor=south west,
anchor=mid west,
grow'=0,
font=\sffamily,
if n children=0{}{
delay={
prepend={[,phantom, calign with current]}
}
},
before computing xy={
l=2em
}
},
}{
if level=0{% this is the root node of the tree, level 0
parent anchor=south,
anchor=south,
before drawing tree={% we repack just the top bit of the tree, right at the end, to account for the increased spacing introduced by moving things around; after repacking, we need to explicitly recompute the x-y coordinates as well, before the tree is drawn
pack',
compute xy,
}
}{},
},
},
}
}
\begin{document}
\begin{forest}
% forest preamble: determine layout and format of tree
direction switch% apply the style defined above
% specify the content of the tree
[{Dry Air Oxidation (\ch{U + O2})}
[Chemical Diffusion
[Quasi-steady diffusion
[Comparison with GK model
]
]
[Unsteady diffusion
[Neglecting volumetric changes
[Numerical + Analytical\\ + Asymptotics]
]
[Including volumetric changes
[Numerical solution]
]
]
]
[Ionic Diffusion
[Moderate Electric Field
[Quasi-steady diffusion]
[Unsteady diffusion]
]
[Strong Electric Field
[Quasi-steady]
[Unsteady diffusion]
]
]
]
\end{forest}
\end{document}
生成结果：
。我希望能够从根节点改变锚点的位置；换句话说，以“干空气氧化”为中心。
答案1
如果您对近似解决方案感到满意，那么只需添加parent anchor=-160。
\PassOptionsToPackage{rgb,svgnames,dvipsnames,x11names}{xcolor}
\documentclass[border=10pt,tikz]{standalone}
\usepackage{forest}
\usepackage{chemformula}
\forestset{% this specifies a style, direction switch, which manages the layout, formatting and tweaking of the various levels and nodes of the tree itself
direction switch/.style={
for tree={l sep=-10em,
draw=DodgerBlue2,
thick,
inner ysep=2pt,
edge={thick},
if level=1{% the root node is level 0 so this is the layer of horizontally aligned nodes beneath it
parent anchor=south,
child anchor=north,
edge path={
\noexpand\path [draw, \forestoption{edge}] (!u.parent anchor) -- ++(0,-.5em) -| (.child anchor)\forestoption{edge label};
},
for descendants={% apply to everything beneath level 1
child anchor=west,
align=left,
edge path={
\noexpand\path [draw, \forestoption{edge}] (!u.parent anchor) ++(1em,0) |- (.child anchor)\forestoption{edge label};
},
s sep+=1.5pt,
fit=band,
},
for tree={% apply to everything in level 1 or beneath level 1
parent anchor=south west,
anchor=mid west,
grow'=0,
font=\sffamily,
if n children=0{}{
delay={
prepend={[,phantom, calign with current]}
}
},
before computing xy={
l=2em
}
},
}{
if level=0{% this is the root node of the tree, level 0
parent anchor=south,
anchor=south,
before drawing tree={% we repack just the top bit of the tree, right at the end, to account for the increased spacing introduced by moving things around; after repacking, we need to explicitly recompute the x-y coordinates as well, before the tree is drawn
pack',
compute xy,
}
}{},
},
},
}
}
\begin{document}
\begin{forest}
% forest preamble: determine layout and format of tree
direction switch% apply the style defined above
% specify the content of the tree
[{Dry Air Oxidation (\ch{U + O2})},parent anchor=-160
[Chemical Diffusion
[Quasi-steady diffusion
[Comparison with GK model
]
]
[Unsteady diffusion
[Neglecting volumetric changes
[Numerical + Analytical\\ + Asymptotics]
]
[Including volumetric changes
[Numerical solution]
]
]
]
[Ionic Diffusion
[Moderate Electric Field
[Quasi-steady diffusion]
[Unsteady diffusion]
]
[Strong Electric Field
[Quasi-steady]
[Unsteady diffusion]
]
]
]
\end{forest}
\end{document}
您还可以计算节点锚点。这是通过在案例中使用([xshift={2pt+0.5*width("Dry Air Oxidation")}]!u.south west)而不是 来实现的。(!u.parent anchor)level=1
\PassOptionsToPackage{rgb,svgnames,dvipsnames,x11names}{xcolor}
\documentclass[border=10pt,tikz]{standalone}
\usepackage{forest}
\usepackage{chemformula}
\forestset{% this specifies a style, direction switch, which manages the layout, formatting and tweaking of the various levels and nodes of the tree itself
direction switch/.style={
for tree={l sep=-10em,
draw=DodgerBlue2,
thick,
inner ysep=2pt,
edge={thick},
if level=1{% the root node is level 0 so this is the layer of horizontally aligned nodes beneath it
parent anchor=south,
child anchor=north,
edge path={
\noexpand\path [draw, \forestoption{edge}]
([xshift={2pt+0.5*width("Dry Air Oxidation")}]!u.south west) -- ++(0,-.5em) -| (.child anchor)\forestoption{edge label};
},
for descendants={% apply to everything beneath level 1
child anchor=west,
align=left,
edge path={
\noexpand\path [draw, \forestoption{edge}] (!u.parent anchor) ++(1em,0) |- (.child anchor)\forestoption{edge label};
},
s sep+=1.5pt,
fit=band,
},
for tree={% apply to everything in level 1 or beneath level 1
parent anchor=south west,
anchor=mid west,
grow'=0,
font=\sffamily,
if n children=0{}{
delay={
prepend={[,phantom, calign with current]}
}
},
before computing xy={
l=2em
}
},
}{
if level=0{% this is the root node of the tree, level 0
parent anchor=south,
anchor=south,
before drawing tree={% we repack just the top bit of the tree, right at the end, to account for the increased spacing introduced by moving things around; after repacking, we need to explicitly recompute the x-y coordinates as well, before the tree is drawn
pack',
compute xy,
}
}{},
},
},
}
}
\begin{document}
\begin{forest}
% forest preamble: determine layout and format of tree
direction switch% apply the style defined above
% specify the content of the tree
[{Dry Air Oxidation (\ch{U + O2})}
[Chemical Diffusion
[Quasi-steady diffusion
[Comparison with GK model
]
]
[Unsteady diffusion
[Neglecting volumetric changes
[Numerical + Analytical\\ + Asymptotics]
]
[Including volumetric changes
[Numerical solution]
]
]
]
[Ionic Diffusion
[Moderate Electric Field
[Quasi-steady diffusion]
[Unsteady diffusion]
]
[Strong Electric Field
[Quasi-steady]
[Unsteady diffusion]
]
]
]
\end{forest}
\end{document}
\documentclass{beamer}
\usepackage[edges]{forest}
\begin{document}
\begin{frame}[t]
\frametitle{A tree}
\centering
\begin{forest}
forked edges,
for tree={rounded corners,draw,fill=gray!20,font=\sffamily,
align=left,text width=7em,s sep+=0.5em}
[\textbf{Approach}
[{\textbf{location-based}\\[1.2em] blub}]
[{\textbf{inertia-based}\\[1.2em] blah}]
[{\textbf{hybrid}\\[1.2em] pft}]
]
\end{forest}
\end{frame}
\end{document}
