当我在 中使用spy和时，放大镜似乎放大的不是我指定的区域。不过，小指针位于正确的位置。如果我设置，放大倍数似乎位于正确的位置。scaletikzpicturescale=1.0
另外，如果我使用pgfonlayer它在背景中创建绘图，如何将其放大spy？
这是一个最小的工作示例：
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{spy, backgrounds}
\begin{document}
\begin{figure}
\begin{tikzpicture} [spy using outlines={circle, magnification=4, size=1cm, connect spies},
scale = 1.4,transform shape]
\draw[help lines] (0,0) grid (4,4);
\draw (0,0) -- (3,3) -- (3,0);
\begin{pgfonlayer}{background}
\draw[red] (2.9,0) -- (2.9,4);
\end{pgfonlayer}
\spy [black] on (3,3) in node [left] at (5,5);
\end{tikzpicture}
\end{figure}
\end{document}
请注意，我在放大镜中看到的是三角形的一个角以及垂直红线的一部分（在背景层中）。
答案1
针对你的问题，我有两个建议：
- 我没有扩大你的间谍规模，而是尝试了
magnification和size选项； - 您还可以通过在任何后续内容之前排版来在背景中打印某些内容。
这个最小的例子强调了上述建议：
\documentclass{article}
\usepackage{tikz}% http://ctan.org/pkg/pgf
\usetikzlibrary{spy, backgrounds}
\begin{document}
\begin{tikzpicture} [spy using outlines={circle, magnification=8, size=2cm, connect spies, transform shape}]
\draw[red] (2.9,0) -- (2.9,4);
\draw[help lines] (0,0) grid (4,4);
\draw (0,0) -- (3,3) -- (3,0);
%\begin{pgfonlayer}{background}
% \draw[red] (2.9,0) -- (2.9,4);
%\end{pgfonlayer}
\spy [black] on (3,3) in node [left] at (6,5.5);
\end{tikzpicture}
\end{document}
答案2
我刚刚发现自己想要将图层与间谍库一起使用，因此发现自己处于您描述的情况，即只有主图层上的内容才会出现在节点中spy in。重新排序图层对我来说不是一个选择，所以我查看了间谍库，看看我是否能弄清楚发生了什么。
简而言之，图层的工作方式是将每个图层保存在一个框中，然后在最后按所需顺序堆叠这些框。间谍库实际上的工作原理非常相似：它将绘图保存在一个框中，以便可以将其（带剪辑）复制到节点中。它们不能一起工作，因为当东西保存到其图层框中时，它不会保存到间谍框中。我想到的解决方案是确保间谍库使用所有图层。现在，这在范围方面变得有点复杂，所以在下面我只对整个图片使用它。
这可能不是最终的解决方案，但它是一个可行的解决方案。当我使用它时，我可能会对其进行一些调整。将以下内容保存为tikzlibraryspyall.code.tex并使用\usetikzlibrary{spyall}。
% Spy all styles
\tikzset{
spy all using outlines/.style={
spy picture={
every spy all on node/.style={very thin,draw},
every spy all in node/.style={thick,draw},
#1
}
},
spy all using overlays/.style={
spy picture={
every spy all on node/.style={fill,fill opacity=0.2,text opacity=1},
every spy all in node/.style={fill,fill opacity=0.2,text opacity=1},
#1
}
},
connect spies/.style={
spy connection path={\draw[thin] (tikzspyonnode) -- (tikzspyinnode);}
}
}
%\newbox\tikz@lib@spybox
\let\tikz@lib@spyall@collection=\pgfutil@empty%
\tikzset{spy picture/.style={
size/.style={minimum size=##1},
height/.style={minimum height=##1},
width/.style={minimum width=##1},
execute at begin picture={%
\let\tikz@lib@spyall@save=\tikz@lib@spyall@collection%
\let\spyall=\tikz@lib@spyall@parse%
\tikz@insert@spy@layer
\pgfonlayer{spy}%
},
execute at end picture={%
\endpgfonlayer
{%
\tikz@lib@spyall@collection%
}%
\global\let\tikz@lib@spyall@collection=\tikz@lib@spyall@save%
},%
tikz@lib@spyall@style/.style={#1},
tikz@lib@reset@gs
},
lens/.store in=\tikz@lib@spy@lens,
lens=,
magnification/.style={lens={scale=#1}},
spy connection path/.store in=\tikz@lib@spy@path,
spy connection path=
}
\tikzset{
tikz@lib@reset@gs/.style={black,thin,solid,opaque,line cap=butt,line join=miter}
}
\def\tikz@lib@spyall@parse{%
\pgfutil@ifnextchar[{\tikz@lib@spyall@parse@opt}{\tikz@lib@spyall@parse@opt[]}%]
}
\def\tikz@lib@spyall@parse@opt[#1]{
\pgfutil@ifnextchar x{\tikz@lib@spyall@parse@opta[#1]}{\tikz@lib@spyall@parse@opta[#1]}%]
}
\def\tikz@lib@spyall@parse@opta[#1]on#2in node#3;{%
\pgfutil@g@addto@macro\tikz@lib@spyall@collection{\tikz@lib@spyall@do{#1}{#2}{#3}}%
}
\def\tikz@lib@spyall@do#1#2#3{%
\scope[tikz@lib@spyall@style,#1]
\node [alias=tikzspyonnode,inner sep=0pt,outer sep=0pt,every spy all on node/.try,
/utils/exec={
{%
\let\tikz@transform=\relax
\pgftransformreset%
\expandafter\tikzset\expandafter{\tikz@lib@spy@lens}
\pgftransforminvert%
\pgfgettransformentries\a\b\c\d\e\f%
\global\let\pgf@lib@svg@a=\a%
\global\let\pgf@lib@svg@b=\b%
\global\let\pgf@lib@svg@c=\c%
\global\let\pgf@lib@svg@d=\d%
}%
\tikz@addtransform{%
\tikz@scan@one@point\pgftransformshift#2%
\pgftransformcm{\pgf@lib@svg@a}{\pgf@lib@svg@b}{\pgf@lib@svg@c}{\pgf@lib@svg@d}{\pgfpointorigin}%
}
}]{};
\node [alias=tikzspyinnode,inner sep=0pt,outer sep=0pt,at={#2},every spy all in node/.try,
path picture={\node[anchor=center,tikz@lib@reset@gs]{\nullfont%
\pgfpicture\relax\pgfsetbaseline{default}\pgfsettrimleft{default}\pgfsettrimright{default}%
\pgftransformreset%
\let\tikz@transform=\relax%
\expandafter\tikzset\expandafter{\tikz@lib@spy@lens}%
\pgflowlevelsynccm%
\tikz@scan@one@point\tikz@lib@spyall@shift#2%
\pgflowlevelsynccm%
\pgf@dosavedlayers
\endpgfpicture};}]#3{};
\tikz@lib@spy@path
\endscope
}
\def\tikz@lib@spyall@shift#1{%
\pgf@process{#1}%
\pgf@x=-\pgf@x%
\pgf@y=-\pgf@y%
\pgftransformshift{}%
}
\pgfdeclarelayer{spy}
\def\tikz@insert@spy@layer{%
\expandafter\tikz@insert@spy@@layer\pgf@layerlist\relax
}
\def\tikz@insert@spy@@layer#1main#2\relax{%
\def\pgf@layerlist{#1spy#2,main}%
}
\def\pgf@dosavedlayers{%
\expandafter\pgf@dosavedlayer\pgf@layerlist,,\relax%
}
\def\pgf@dosavedlayer#1,#2,\relax{%
\def\pgf@test{#1}%
\ifx\pgf@test\pgf@maintext%
\copy\pgf@layerbox@main
\else%
\expandafter\copy\csname pgf@layerboxsaved@#1\endcsname
\fi%
\def\pgf@test{#2}%
\ifx\pgf@test\pgfutil@empty%
\else%
\pgf@dosavedlayer#2,\relax%
\fi%
}
\newbox\pgf@layerboxsaved@main
\def\pgf@dosavelayer#1,#2,\relax{%
\def\pgf@test{#1}%
\ifx\pgf@test\pgf@maintext%
\setbox\pgf@layerboxsaved@main=\box\pgf@layerbox@main
\else%
\setbox\csname pgf@layerboxsaved@#1\endcsname=\box\csname pgf@layerbox@#1\endcsname%
\fi%
\def\pgf@test{#2}%
\ifx\pgf@test\pgfutil@empty%
\else%
\pgf@dosavelayer#2,\relax%
\fi%
}
\endinput
这是测试文档。真正的文档是很多更复杂。
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{spyall}
\pgfdeclarelayer{back}
\pgfdeclarelayer{front}
\pgfsetlayers{back,main,front}
\begin{document}
\begin{tikzpicture}[spy all using outlines={circle,magnification=4,size=2cm, connect spies}]
\begin{pgfonlayer}{front}
\draw[ultra thick,black] (.5,0) -- (.5,1);
\end{pgfonlayer}
\draw[ultra thick,blue] (0,0) -- (1,1);
\begin{pgfonlayer}{back}
\draw[ultra thick,green] (1,0) -- (0,1);
\end{pgfonlayer}
\spyall [red] on (.5,.5) in node at (.5,3);
\draw[ultra thick,cyan] (0,.5) -- (1,.5);
\end{tikzpicture}
\end{document}
