跟随我的上一个问题例如，在这个 MWE 中，如何为每个父/子/孙分支设置一个独特的颜色，使得颜色在向下时逐渐变暗或变亮？
换句话说，如果我想为节点Parent 1、Child 1和设定蓝色Grandchild 1，我希望它们的填充颜色分别为blue!80、blue!50和blue!20。同样，我想为其他分支设定其他颜色，并且各个节点应以相同的方式着色。
\documentclass[border=10pt,multi,tikz]{standalone}
\usepackage[edges]{forest}
\usetikzlibrary{arrows.meta,shadows.blur}
\begin{document}
\newlength\gap
\setlength\gap{10mm}
\begin{forest}
forked edges,
for tree={
draw=blue!80!darkgray,
fill=blue!80!darkgray!25,
rounded corners,
minimum width=(\textwidth-6*\gap)/3,
minimum height=4ex,
edge={-Latex},
font=\sffamily,
text centered,
blur shadow,
},
where={level()<=1}{%
parent anchor=children,
l sep+=10pt,
s sep'+=10pt,
}{%
folder,
grow'=0,
l sep+=0pt,% length of edge to grand child
if level=2{%
before typesetting nodes={child anchor=north},
!u.s sep'+=10pt,
edge path'={%
(!u.parent anchor) -- ++(0,-10pt) -| (.child anchor)
},
}{},
}
[Grandparent
[Parent 1
[Child 1
[Grandchild 1]
]
]
[Parent 2
[Child 2
[Grandchild 2]
]
]
[Parent 3
[Child 3
[Grandchild 3]
]
]
]
\end{forest}
\end{document}
答案1
这是一个不同的版本（稍微简单一些）：
\documentclass[border=10pt,multi,tikz]{standalone}
\usepackage[edges]{forest}
\usetikzlibrary{arrows.meta,shadows.blur}
\begin{document}
\newlength\gap
\setlength\gap{10mm}
\forestset{parent color/.style args={#1}{
{fill=#1},
for tree={fill/.wrap pgfmath arg={#1!##1}{1/level()*80},draw=#1!80!darkgray}},
root color/.style args={#1}{fill={{#1!60!gray!25},draw=#1!80!darkgray}}
}
\begin{forest}
forked edges,
for tree={%
rounded corners,
minimum width=(\textwidth-6*\gap)/3,
minimum height=4ex,
edge={-Latex},
font=\sffamily,
text centered,
blur shadow,
},
where={level()<=1}{%
parent anchor=children,
l sep+=10pt,
s sep'+=10pt,
}{%
folder,
grow'=0,
l sep+=2pt,% length of edge to grand child
if level=2{%
before typesetting nodes={child anchor=north},
!u.s sep'+=10pt,
edge path'={%
(!u.parent anchor) -- ++(0,-10pt) -| (.child anchor)
},
}{},
},
[Grandparent,root color={brown}
[Parent 1, parent color={red}
[Child 1
[Grandchild 1]
]
]
[Parent 2,parent color={green}
[Child 2
[Grandchild 2]
]
]
[Parent 3,parent color={yellow}
[Child 3
[Grandchild 3]
]
]
]
\end{forest}
\end{document}
答案2
您可以使用以下样式branch shade=from <colour> to <colour>来为树枝添加阴影。
[编辑以支持诸如保留第二种颜色blue!80规范隐含的颜色。]white
新版本的代码还family tree为树创建了一种样式，该样式应遵循此结构模式。twist=<integer>设置应发生更改的级别，以便更高级别的子级将设置folder样式，即目录样式。默认值为2。
正如 Alan Munn 指出的，这实际上与以前相同（例如，也通过.max处理程序隐式地依赖于 nodewalk）。
注意
l sep+=0pt,
对任何东西都没有影响。它给维度增加了一个零长度，这显然等于什么都没有。
然后我们可以写
\begin{forest}
family tree,
[Grandparent, left color=cyan, right color=SpringGreen, middle color=Pink, draw=Silver
[Parent 1, branch shade=from cyan to blue
[Child 1
[Grandchild 1]
]
]
[Parent 2, branch shade=from Pink to WildStrawberry
[Child 2
[Grandchild 2]
]
]
[Parent 3, branch shade=from SpringGreen to ForestGreen
[Child 3
[Grandchild 3]
]
]
]
\end{forest}
生成由此答案的原始版本中的代码版本创建的树。
正如你所看到的，我不知道如何处理根。
或者我们可以写
\begin{forest}
family tree,
[Grandparent, fill=darkgray, text=Silver, double=Silver, draw=darkgray
[Parent 1, branch shade=from blue!80 to blue!20
[Child 1
[Grandchild 1]
]
]
[Parent 2, branch shade=from WildStrawberry!80 to WildStrawberry!20
[Child 2
[Grandchild 2]
]
]
[Parent 3, branch shade=from ForestGreen!80 to ForestGreen!20
[Child 3
[Grandchild 3]
]
]
]
\end{forest}
隐式地使用white并以不同的方式设置根节点的样式。
完整代码：
\documentclass[border=10pt,multi,tikz,dvipsnames,svgnames,rgb]{standalone}
\usepackage[edges]{forest}
\usetikzlibrary{arrows.meta,shadows.blur}
\forestset{
declare dimen register=gap,
gap'=10mm,
declare count register=twist,
twist'=2,
family tree/.style={
forked edges,
for tree={
rounded corners,
minimum width/.wrap pgfmath arg={##1}{(\textwidth-6*(gap))/3},
minimum height=4ex,
edge={-Latex},
font=\sffamily,
text centered,
blur shadow,
edge=thick,
},
where={level()<(twist)}{%
parent anchor=children,
l sep+=10pt,
s sep'+=10pt,
}{%
folder,
grow'=0,
l sep'+=2pt,
if={level()==(twist)}{%
before typesetting nodes={child anchor=north},
!u.s sep'+=10pt,
edge path'={%
(!u.parent anchor) -- ++(0,-10pt) -| (.child anchor)
},
}{},
},
},
branch shade/.style args={from #1 to #2}{
before typesetting nodes={
tempcountc/.max={level}{current,tree},
tempcountb/.option=level,
tempcounta=(tempcountc)-(tempcountb)+1,
temptoksa/.option=name,
TeX/.wrap pgfmath arg={
\colorlet{##1col1}{#1}
\colorlet{##1col2}{#2}
}{name()},
for tree={
rounded corners,
top color/.wrap 2 pgfmath args={##2col2!##1!##2col1}{100*((level()-(tempcountb))/(tempcounta))}{(temptoksa)},
+edge/.wrap 2 pgfmath args={##2col2!##1!##2col1}{100*((level()-(tempcountb))/(tempcounta))}{(temptoksa)},
bottom color/.wrap 2 pgfmath args={##2col2!##1!##2col1}{100*((level()-(tempcountb)+1)/(tempcounta))}{(temptoksa)},
draw/.wrap 2 pgfmath args={##2col2!##1!##2col1}{100*((level()-(tempcountb)+1)/(tempcounta))}{(temptoksa)},
thick,
},
}
},
}
\begin{document}
\begin{forest}
family tree,
[Grandparent, left color=cyan, right color=SpringGreen, middle color=Pink, draw=Silver
[Parent 1, branch shade=from cyan to blue
[Child 1
[Grandchild 1]
]
]
[Parent 2, branch shade=from Pink to WildStrawberry
[Child 2
[Grandchild 2]
]
]
[Parent 3, branch shade=from SpringGreen to ForestGreen
[Child 3
[Grandchild 3]
]
]
]
\end{forest}
\begin{forest}
family tree,
[Grandparent, fill=darkgray, text=Silver, double=Silver, draw=darkgray
[Parent 1, branch shade=from blue!80 to blue!20
[Child 1
[Grandchild 1]
]
]
[Parent 2, branch shade=from WildStrawberry!80 to WildStrawberry!20
[Child 2
[Grandchild 2]
]
]
[Parent 3, branch shade=from ForestGreen!80 to ForestGreen!20
[Child 3
[Grandchild 3]
]
]
]
\end{forest}
\end{document}