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PGFPlot 格式帮助

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PGFPlot 格式帮助

我有以下 pgfplot：

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{every axis legend/.append style={
at={(1.05,1)},
anchor=north west}}

\begin{document}
\begin{tikzpicture}
\begin{axis}[
    ylabel=Number of Respondents,
    enlargelimits=0.15,
    legend cell align=right,
    ybar,
    bar width=10pt,
    symbolic x coords = {Very U, Somewhat U, Not U},
    xtick=data,
    x tick label style={anchor=north},
    width=.50\textwidth,
    ymin=0,
    ]
    \addplot
    coordinates {(Very U,1) (Somewhat U,3) (Not U,1)};
    \addplot
    coordinates {(Very U,2) (Somewhat U,0) (Not U,0)};
    \addplot 
    coordinates {(Very U,1) (Somewhat U,2) (Not U,0)};
    \addplot 
    coordinates {(Very U,4) (Somewhat U,5) (Not U,1)};
\legend{Survey Vote \#257, Survey Vote \#968, Survey Vote \#156, All Surveys}
\end{axis}
\end{tikzpicture}
\end{document}

我想要做的是让最左边的组在开始之前有一个小填充（不在 y 轴的正上方），并且最右边的组也一样，在它和 y 轴之间有一个小填充。

我还想让图例稍微大一点……

答案1

为了在图的左侧和右侧获得额外的填充，您可以设置enlarge x limits=<fraction>。0.3在这种情况下效果很好，但它会导致图中间的条重叠，因此您必须将减少一点bar width，比如说，减少到6pt。

enlarge x limits=0.3,
bar width=6pt

如您所见，由于 x 标签很长，它们会重叠，因此看起来您必须使图更宽。您可以通过明确设置 aheight和 a来实现width，也可以使用键 来实现x post scale=<multiplier>。

enlarge x limits=0.3,
x post scale=1.5

为了使图例图像更大，您可以使用legend image post style={scale=<multiplier>}：

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{every axis legend/.append style={
at={(1.05,1)},
anchor=north west},
legend image post style={scale=1.5}
}

\begin{document}
\begin{tikzpicture}
\begin{axis}[
    ylabel=Number of Respondents,
    enlarge x limits=0.3,
    x post scale=1.5,
    legend cell align=right,
    ybar,
    symbolic x coords = {Very U, Somewhat U, Not U},
    xtick=data,
    x tick label style={anchor=north},
    width=.50\textwidth,
    ymin=0,
    ]
    \addplot
    coordinates {(Very U,1) (Somewhat U,3) (Not U,1)};
    \addplot
    coordinates {(Very U,2) (Somewhat U,0) (Not U,0)};
    \addplot 
    coordinates {(Very U,1) (Somewhat U,2) (Not U,0)};
    \addplot 
    coordinates {(Very U,4) (Somewhat U,5) (Not U,1)};
\legend{Survey Vote \#257, Survey Vote \#968, Survey Vote \#156, All Surveys}
\end{axis}
\end{tikzpicture}
\end{document}

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