线不完全位于 x 轴上

Question

我的问题：绘制的线并不正好位于轴上......

这是我的输出：

以下是生成它的代码：

\documentclass[tikz,border=2mm]{standalone}
\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
\begin{axis}[ axis on top=true,
         axis x line=middle,
         axis y line=middle,
         inner axis line style={=>},
                 width=6cm,height=6cm,
                     ymin=0,ymax=1.2,
                     xmin=0,xmax=1.2,
                     axis line style = thick,
                     xtick={0,1},
                     ytick={0,1},
                 every axis x label/.style={at={(current axis.right of     origin)},anchor=west},
         every axis y label/.style={at={(current axis.north west)},above=0.5mm},
                 xlabel={$p$},
                 ylabel={$q$}]
\draw[line width=4, red] (0,0)--(100,0);
\end{axis}
\end{tikzpicture}
\end{document}

Answer 1

图表边框会将图表全部剪掉，因此您只能看到一半的线。要解决这个问题，您有两种可能：

• 在图外画这条线（见另一个答案）
• 使用图表\clip=false中的选项axis

由于这条线比图宽长得多，因此您还需要相应地定义其长度。一种解决方案\addplot是，这条线的宽度如下图所示：

\documentclass[tikz,border=2mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16} % <---

\begin{document}

\begin{tikzpicture}
\begin{axis}[ axis on top=true,
         axis lines=middle, % <---
         %inner axis line style={=>}, % not used
                 width=6cm,height=6cm,
                     ymin=0,ymax=1.2,
                     xmin=0,xmax=1.2,
                     %axis line style = thick,
                     xtick={0,1},
                     ytick={0,1},
                 every axis x label/.style={at={(current axis.right of origin)}, anchor=west},
         every axis y label/.style={at={(current axis.north west)},above=0.5mm},
                 xlabel={$p$},
                 ylabel={$q$},                 
                 clip=false % <---
                    ]
\addplot +[line width=4pt, no marks, red] coordinates {(0,0) (1,0)};
\end{axis}
\end{tikzpicture}
\end{document}

Answer 2

\documentclass[tikz,border=2mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest} %added
\begin{document}
\begin{tikzpicture}
\begin{axis}[ axis on top=true,
         axis x line=middle,
         axis y line=middle,
         inner axis line style={=>},
                 width=6cm,height=6cm,
                     ymin=-0.05,ymax=1.2,  %made ymin negative, to include red line
                     xmin=0,xmax=1.2,
                     axis line style = thick,
                     xtick={0,1},
                     ytick={0,1},
                 every axis x label/.style={at={(current axis.right of     origin)},anchor=west},
         every axis y label/.style={at={(current axis.north west)},above=0.5mm},
                 xlabel={$p$},
                 ylabel={$q$}]
\draw[line width=4, red] (0,0)--(1,0); %changed form 100 to 1
\end{axis}
\end{tikzpicture}
\end{document}

Answer 3

只需将您的行代码移到axis其前面和外面即可：

\documentclass[tikz,border=2mm]{standalone}
\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
\draw[line width=4pt, red] (0,0)--(100,0);
\begin{axis}[ axis on top=true,
         axis x line=middle,
         axis y line=middle,
         inner axis line style={=>},
                 width=6cm,height=6cm,
                     ymin=0,ymax=1.2,
                     xmin=0,xmax=1.2,
                     axis line style = thick,
                     xtick={0,1},
                     ytick={0,1},
                 every axis x label/.style={at={(current axis.right of     origin)},anchor=west},
         every axis y label/.style={at={(current axis.north west)},above=0.5mm},
                 xlabel={$p$},
                 ylabel={$q$}]
%\draw[line width=4pt, red] (0,0)--(100,0);
\end{axis}

\end{tikzpicture}
\end{document}