如何在使用组图时删除多余的垂直空间

Question

我遵循的例子是pgfplots 中的轴断裂

然而，我发现你在绘图上得到了虚假的垂直空间

有什么方法可以移除它吗？它为什么在那里？

\documentclass[convert]{standalone}  
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{pgfplots.groupplots}

\begin{document}
\pgfplotsset{every non boxed x axis/.style={}}
\fbox{\begin{tikzpicture}%
\begin{groupplot}[
    group style={
        group name=my fancy plots,
        group size=1 by 2,
        xticklabels at=edge bottom,
        vertical sep=0pt
    },
    width=8.5cm,
    xmin=-6, xmax=6
]%
%
\nextgroupplot[ymin=45,ymax=80,
               ytick={60,80},
               axis x line=top, 
               axis y discontinuity=parallel,
               height=4.5cm]%
\addplot {x*0};%
\addplot {x^2+50};%
%
\nextgroupplot[ymin=0,ymax=5,
               ytick={0},
               axis x line=bottom,
               height=2.0cm]%
\addplot {x*0};% 
\addplot {x^2+50};%
\end{groupplot}%
\end{tikzpicture}}

\end{document}

Answer 1

我只想添加一次这些情节，但很可能我遗漏了一些东西。

\documentclass[convert,border=3.14mm]{standalone}  
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{pgfplots.groupplots}

\begin{document}
\pgfplotsset{every non boxed x axis/.style={}}
\fbox{\begin{tikzpicture}%
\begin{groupplot}[
    group style={
        group name=my fancy plots,
        group size=1 by 2,
        xticklabels at=edge bottom,
        vertical sep=0pt
    },
    width=8.5cm,
    xmin=-6, xmax=6
]%
%
\nextgroupplot[ymin=45,ymax=80,
               ytick={60,80},
               axis x line=top, 
               axis y discontinuity=parallel,
               height=4.5cm]%
%\addplot {x*0};%
\addplot[red,mark=square*] {x^2+50};%
%
\nextgroupplot[ymin=0,ymax=5,overlay,
               ytick={0},
               axis x line=bottom,
               height=2cm]%
\addplot[blue,mark=*] {x*0};% 
%\addplot {x^2+50};%
\end{groupplot}%
\path(current axis.south) -- ++(0,-0.5cm);
\end{tikzpicture}}

\end{document}

Answer 2

我的解决方案需要使用重复图来简化进一步的计算。我的解决方案是采取一种变通方法，类似于\useasboundingbox@Henri Menke 建议的选项。

但是，对于我来说，边界框一开始就不起作用。我需要使用 重置边界框\pgfresetboundingbox\path (plot c1r1.outer north west) rectangle (plot c1r2.outer south east);，其中plot是组的名称， 是c1r1组的命名约定。

\documentclass[convert]{standalone}  
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{pgfplots.groupplots}

\begin{document}
\pgfplotsset{every non boxed x axis/.style={}}
\fbox{\begin{tikzpicture}[]%
\begin{groupplot}[
    group style={
        group name=plot,
        group size=1 by 2,
        xticklabels at=edge bottom,
        vertical sep=0pt
    },
    width=8.5cm,
    xmin=-6, xmax=6
]%
%
\nextgroupplot[ymin=45,ymax=80,
               ytick={60,80},
               axis x line=top, 
               axis y discontinuity=parallel,
               height=4.5cm,
               legend to name=leg
               ]%
\addplot {x*0};%
\addplot {x^2+50};%
\nextgroupplot[ymin=0,ymax=5,
               ytick={0},
               axis x line=bottom,
               height=2.0cm,
               legend to name=leg
               ]%
\addplot {x*0};
\addplot {x^2+50};%
\end{groupplot}%
\pgfresetboundingbox\path (plot c1r1.outer north west) rectangle (plot c1r2.outer south east); % adjust to fit
\end{tikzpicture}}

\end{document}