我正在使用 genealogytree 包（基于 tikz）来创建家谱。代码示例可以在这里找到在这个问题中基本上，我有一个简单的树，只有我和我的妻子以及想象中的婴儿，然后她的树向一侧倾斜 90 度，我的树向另一侧倾斜 90 度。最好的示例代码在我链接的另一个问题的第一个答案中。
现在我想让整个画面更漂亮。在 genealogytree 包的手册中，第一页包含代码。在该示例中，作者使用从白色到红色的 25% 不透明度渐变来为节点后面的背景着色。渐变从一个角到另一个角。示例可在此处找到在第 1 页和第 2 页。
我想要做的是为我们每个人取一个渐变色，在我自己树后面放一个蓝色，在我妻子树后面放一个红色，然后让两个渐变色在我们之间相交。当我在树的两边添加更多人时，我们的个人节点会不断切换位置，所以我想让渐变覆盖整个页面的背景，但始终保持交点在我们之间的中心。
答案1
在我的回答中，我使用了两个在核心系列中心点相交的阴影。为此，id=corefamily向核心系列添加了一个。阴影代码为：
\begin{scope}[on background layer]
\path([xshift=-2mm,yshift=-2mm]current bounding box.south west)
rectangle ([xshift=2mm,yshift=2mm]current bounding box.north east);
\path[left color=blue!75,right color=blue!50!red!75]
(current bounding box.south west) rectangle (corefamily|-current bounding box.north east);
\path[left color=blue!50!red!75,right color=red!75]
(corefamily|-current bounding box.south west) rectangle (current bounding box.north east);
\end{scope}
示例的完整代码为：
\documentclass[9pt]{report}
\usepackage[a3paper,landscape,layoutoffset={0pt,0pt},hscale=0.85, vscale=0.9, inner=5mm, top=20mm]{geometry}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
%\usepackage[swedish]{babel}
\usepackage{multicol}
\usepackage{graphicx}
\usepackage[space]{grffile}
\usepackage{xcolor}
\usepackage{epstopdf}
\usepackage[all]{genealogytree}
\usetikzlibrary{backgrounds}
\begin{document}
\tcbset{male/.style={colframe=black, colback=blue!06, watermark text=\gtrSymbolsSetDraw{blue!16}\gtrsymMale}}
\tcbset{female/.style={colframe=black, colback=red!07, watermark text=\gtrSymbolsSetDraw{red!17}\gtrsymFemale}}
\gtrset{
box={colback=white},
edges={swing,no background,foreground=black!50},
}
\begin{tikzpicture}
\genealogytree[timeflow=down,
%tree offset=0.4 cm,
level size=3 cm,
node size=5 cm,
level distance=1.25 cm,
child distance=1.75 cm,
parent distance=2.5 cm,
further distance = 3 cm
]
{
sandclock[id=corefamily]
{
parent
{
g[male, id=DEL2]{Dan-Erik Sigurd Lindberg}
}
parent
{
g[female, id=AKL2]{Angsana Keeratijarut Lindberg}
}
c[male]{test}
}
}
\genealogytree[timeflow=right, set position=DEL at DEL2,
box={colback=white},
edges={swing,no background,foreground=black!50},
level size=5 cm,
node size=3 cm,
level distance=1.75 cm,
child distance=1.25 cm,
parent distance=0.1 cm,
further distance = 3 cm
]
{
sandclock
{
child
{
g[male]{Olle Lars Olof Evert Lindberg}
}
child
{
g[male]{Holger Nils Ã…ke Lindberg}
}
child
{
g[female]{Hedvig Emma-Lena Liljenberg}
}
child
{
g[male, pivot, id=DEL]{Dan-Erik Sigurd Lindberg}
}
parent
{
c[female]{Kerstin Eriksson}
c[male]{Bengt Nilsson}
g[female, pivot]{Ingrid Birgitta Lindberg}
parent
{
g[male, pivot]{Axel Nilsson}
}
parent
{
g[female, pivot]{Anna Nilsson}
parent
{
g[male, pivot]{Lars Petter Hansander}
}
parent
{
g[female, pivot]{Emma Katarina Lindén}
}
}
}
parent
{
g[male, pivot]{Rolf Sigurd Lindberg}
c[female]{Margareta Eman}
c[female]{Monica Björklund}
parent
{
g[male, pivot]{Curt Sigurd Lindberg}
parent
{
g[male, pivot]{Sigurd Lindberg}
}
parent
{
g[female]{Elin Lindberg}
}
}
parent
{
g[female]{Hedvig Lindberg}
}
}
}
}
\genealogytree[timeflow=left, set position=AKL at AKL2,
box={colback=white},
edges={swing,no background,foreground=black!50},
level size=5 cm,
node size=3 cm,
level distance=1.75 cm,
child distance=1.25 cm,
parent distance=0.1 cm,
further distance = 3 cm
]
{
sandclock
{
child
{
g[male]{Attachai Keeratijarut}
}
child
{
g[female, pivot, id=AKL]{Angsana Keeratijarut Lindberg}
}
parent
{
g[male, pivot]{Anop Keeratijarut}
}
parent
{
g[female, pivot]{Renu Keeratijarut}
}
}
}
\begin{scope}[on background layer]
\path([xshift=-2mm,yshift=-2mm]current bounding box.south west)
rectangle ([xshift=2mm,yshift=2mm]current bounding box.north east);
\path[left color=blue!75,right color=blue!50!red!75]
(current bounding box.south west) rectangle (corefamily|-current bounding box.north east);
\path[left color=blue!50!red!75,right color=red!75]
(corefamily|-current bounding box.south west) rectangle (current bounding box.north east);
\end{scope}
\end{tikzpicture}
\end{document}