缩放每个节点时的颜色条问题

Question

我试图说明一个混淆矩阵，当我缩放每个节点时，它似乎弄乱了颜色条。请注意，颜色条没有完全填满。

以下是 MWE：

\documentclass{standalone}

\usepackage{pgfplots}
\pgfplotsset{compat=1.13}

\pgfkeys{
    /pgf/number format/fixed zerofill=true }

\pgfplotstableset{
    color cells/.code={%
        \pgfqkeys{/color cells}{#1}%
        \pgfkeysalso{%
            postproc cell content/.code={%
                %
                \begingroup
                 \pgfkeysgetvalue{/pgfplots/table/@preprocessed cell content}\value
\ifx\value\empty
\endgroup
\else
                \pgfmathfloatparsenumber{\value}%
                \pgfmathfloattofixed{\pgfmathresult}%
                \let\value=\pgfmathresult
                \pgfplotscolormapaccess
                    [\pgfkeysvalueof{/color cells/min}:\pgfkeysvalueof{/color cells/max}]%
                    {\value}%
                    {\pgfkeysvalueof{/pgfplots/colormap name}}%
                \pgfkeysgetvalue{/pgfplots/table/@cell content}\typesetvalue
                \pgfkeysgetvalue{/color cells/textcolor}\textcolorvalue
                \toks0=\expandafter{\typesetvalue}%
                \xdef\temp{%
                    \noexpand\pgfkeysalso{%
                        @cell content={%
                            \noexpand\cellcolor[rgb]{\pgfmathresult}%
                            \noexpand\definecolor{mapped color}{rgb}{\pgfmathresult}%
                            \ifx\textcolorvalue\empty
                            \else
                                \noexpand\color{\textcolorvalue}%
                            \fi
                            \the\toks0 %
                        }%
                    }%
                }%
                \endgroup
                \temp
\fi
            }%
        }%
    }
}

\begin{document}

%\begin{tikzpicture}[every node/.style={scale=0.8}]
\begin{tikzpicture}[scale=0.2, every node/.style={scale=0.75}]
    \begin{axis}[
        width=5cm,
        height=5cm,
    colormap={bluewhite}{color=(white) rgb255=(100,149,237)},
        xticklabels={benign,malware},
        xtick={0,...,1},
        xtick style={draw=none},
        yticklabels={benign,malware},
        ytick={0,...,1},
        ytick style={draw=none},
        enlargelimits=false,
        colorbar,
        colorbar style={
            ytick={0,0.20,0.40,0.60,0.80,1.00},
            yticklabels={0,0.20,0.40,0.60,0.80,1.00},
            yticklabel={\pgfmathprintnumber\tick},
            yticklabel style={
                    /pgf/number format/fixed,
            /pgf/number format/precision=1}
        },
        point meta min=0.0,point meta max=1.0,
        nodes near coords={\pgfmathprintnumber\pgfplotspointmeta},
        nodes near coords style={
                yshift=-7pt,
        /pgf/number format/fixed,
                /pgf/number format/precision=2},
    ]
        \addplot[
            matrix plot,
            mesh/cols=2,
            point meta=explicit,draw=gray
        ] table [meta=C] {
            x y C
            0 0 0.99
            1 0 0.01
            0 1 0.21
            1 1 0.79
        };
    \end{axis}
\end{tikzpicture}

\end{document}

Answer 1

内部颜色填充的缩放比例color bar可以通过plot graphics/node/.styleinside进行调整colorbar style。用于scale=1.33补偿节点缩放 0.75。

    plot graphics/node/.style={scale=1.33,anchor=south west,inner sep=0pt,},

完整代码：

\documentclass[border=3mm]{standalone}

\usepackage{pgfplots}
\pgfplotsset{compat=1.13}
\pgfkeys{/pgf/number format/fixed zerofill=true }

\begin{document}

\begin{tikzpicture}[scale=1, every node/.style={scale=0.75}]
    \begin{axis}[
        width=5cm,
        height=5cm,
    colormap={bluewhite}{color=(white) rgb255=(100,149,237)},
        xticklabels={benign,malware},
        xtick={0,...,1},
        xtick style={draw=none},
        yticklabels={benign,malware},
        ytick={0,...,1},
        ytick style={draw=none},
        enlargelimits=false,
        colorbar,
        colorbar style={
        plot graphics/node/.style={scale=1.33,anchor=south west,inner sep=0pt,},
            ytick={0,0.20,0.40,0.60,0.80,1.00},
            yticklabels={0,0.20,0.40,0.60,0.80,1.00},
            yticklabel={\pgfmathprintnumber\tick},
            yticklabel style={
                    /pgf/number format/fixed,
            /pgf/number format/precision=1}
        },
        point meta min=0.0,point meta max=1.0,
        nodes near coords={\pgfmathprintnumber\pgfplotspointmeta},
        nodes near coords style={
                yshift=-7pt,
        /pgf/number format/fixed,
                /pgf/number format/precision=2},
    ]
        \addplot[
            matrix plot,
            mesh/cols=2,
            point meta=explicit,draw=gray
        ] table [meta=C] {
            x y C
            0 0 0.99
            1 0 0.01
            0 1 0.21
            1 1 0.79
        };
    \end{axis}
\end{tikzpicture}

\end{document}

Answer 2

对于测试前言，axis建议如下：

\begin{axis}[
    width =34mm, height=34mm,           % <--- minimal picture size
colormap={bluewhite}{color=(white) rgb255=(100,149,237)},
    xticklabels={benign,malware},
    xtick={0,...,1},
    xtick style={draw=none},
    yticklabels={benign,malware},
    ytick={0,...,1},
    ytick style={draw=none},
    tick label style={font=\tiny},      % <--- added font size "\tiny"
    enlargelimits=false,
    colorbar,
    colorbar style={
        ytick={0,0.20,0.40,0.60,0.80,1.00},
        yticklabels={0,0.20,0.40,0.60,0.80,1.00},
        yticklabel={\pgfmathprintnumber\tick},
        yticklabel style={
                /pgf/number format/fixed,
        /pgf/number format/precision=1}
    },
    point meta min=0.0,point meta max=1.0,
    nodes near coords={\pgfmathprintnumber\pgfplotspointmeta},
    nodes near coords style={
            yshift=-7pt, font=\tiny,    % <--- added font size "\tiny"
    /pgf/number format/fixed,
            /pgf/number format/precision=2},
]
% ...
\end{axis}

较小的节点不允许水平写入 x 个标签。如果您希望它们更小，则需要通过添加xticklabel style = {rotate=90,anchor=east},到axis前言来旋转这些标签。在这种情况下，您可以将图片尺寸缩小到width =28mm, height=28mm,。

对于更小的图片尺寸，您需要定义更小的字体大小（不推荐）。