![为直方图第 2 部分添加注释](https://linux22.com/image/340864/%E4%B8%BA%E7%9B%B4%E6%96%B9%E5%9B%BE%E7%AC%AC%202%20%E9%83%A8%E5%88%86%E6%B7%BB%E5%8A%A0%E6%B3%A8%E9%87%8A.png)
这个问题建立在这里给出的解决方案。我想在“0”项上添加一条粗线,以便直方图看起来像这样:
以下是代码:
\documentclass[border=3mm,
tikz,
preview
]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\begin{document}
%---------------------------------------------------------------%
\begin{tikzpicture}
\begin{axis}[
ymin=0, ymax=10,
xmin=-0.5, xmax=8,
xtick={0, ..., 7},
ytick={0, ..., 9},
axis x line=bottom,
axis y line=left,
area style,
]
\addplot+[ybar interval] plot coordinates {
(-0.50, 0) (0.5, 9) (1.5, 7) (2.5, 0) (3.5, 2) (4.5, 6) (5.5, 0)
};
\path
\foreach[count=\i from 0] \v in {0, 9, 5, 0, 2, 6, 0} {
(\i, \v) node[below] {\v}
}
(axis description cs:1, 0) node[above left, align=center] {grey\\level}
;
\end{axis}
\end{tikzpicture}
\end{document}
答案1
例如:
\documentclass[border=3mm,
tikz,
preview
]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\begin{document}
%---------------------------------------------------------------%
\begin{tikzpicture}
\begin{axis}[
ymin=0, ymax=10,
xmin=-0.5, xmax=9,
xtick={0, ..., 7},
ytick={0, ..., 9},
axis x line=bottom,
axis y line=left,
area style,
]
\addplot+[ybar interval] plot coordinates {
(-0.50, 0) (0.5, 9) (1.5, 7) (2.5, 0) (3.5, 2) (4.5, 6) (5.5, 0)
};
\path
\foreach[count=\i from 0] \v in {0, 9, 7, 0, 2, 6, 0} {
(\i, \v) node[below] {\v}
}
(axis description cs:1, 0) node[above left, align=center] {grey\\level}
;
\draw[ultra thick, blue]
\foreach \x in {0, 3, 6, 7} {
(\x -.5, 0) -- node[above=2pt, black] {0} (\x + .5, 0)
}
;
\end{axis}
\end{tikzpicture}
\end{document}
答案2
正如 Salim Bou 在评论中所说,您可以通过将高度设置为 来获得细条。0.05
我还添加了一个高度为 的条,以打印条。打印在 x 轴下方的数字未显示,因此请将其打印在上方。0
x=6.5
x=6
\documentclass[border=3mm,
tikz,
preview
]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\begin{document}
%---------------------------------------------------------------%
\begin{tikzpicture}
\begin{axis}[
ymin=0, ymax=10,
xmin=-0.5, xmax=8,
xtick={0, ..., 7},
ytick={0, ..., 9},
axis x line=bottom,
axis y line=left,
area style,
]
\addplot+[ybar interval] plot coordinates {
(-0.50, 0.05) (0.5, 9) (1.5, 7) (2.5, 0.05) (3.5, 2) (4.5, 6) (5.5, 0.05) (6.5, 0)};
\path
\foreach[count=\i from 0] \v in {0, 9, 5, 0, 2, 6, 0} {
\ifnum\v>0
(\i, \v) node[below] {\v}
\else
(\i, \v) node[above] {\v}
\fi
}
(axis description cs:1, 0) node[above left, align=center] {grey\\level}
;
\end{axis}
\end{tikzpicture}
\end{document}