我正在绘制通向两点的晶格路径。我想在笛卡尔平面上绘制辅助线，这样任何与轴距离为整数的线都是实线，任何与轴距离为 0.5 的奇数倍的线都是虚线。我绘制的辅助线甚至与轴不一致！
如何让O、A和B排版到帮助行上。[fill=white,circle,inner sep=0pt]我的代码忽略了该选项。因此，其中一条（放错位置的）帮助行被绘制在了它上面。
\documentclass{amsart}
\usepackage{tikz}
\usetikzlibrary{calc,angles,positioning}
\usepackage{pgfplots}
\pgfplotsset{compat=1.11}
\begin{document}
\hspace*{\fill}
\begin{tikzpicture}
\begin{axis}[
xmin=-11,xmax=11,ymin=-11,ymax=11,
axis lines=middle,
enlargelimits={abs=0.5},
axis line style={latex-latex},
ticklabel style={font=\tiny,fill=white},
xlabel style={at={(ticklabel* cs:1)},anchor=north west},
ylabel style={at={(ticklabel* cs:1)},anchor=south west}
]
\coordinate (O) at (0,0);
\node[fill=white,circle,inner sep=0pt] (O-label) at ($(O)+(-135:10pt)$) {$O$};
\coordinate (A) at (-2.5,9.5);
\node[fill=white,circle] (A-label) at ($(A)+(-180:10pt)$) {$A$};
\coordinate (B) at (7,-3.5);
\node[fill=white,circle] (B-label) at ($(B)+(-45:10pt)$) {$B$};
\draw[fill] (O) circle (1.5pt);
\draw[fill] (A) circle (1.5pt);
\draw[fill] (B) circle (1.5pt);
%These commands are for drawing a path from O to A.
\coordinate (A1) at (-0.5,0);
\coordinate (A2) at (-.5,3);
\coordinate (A3) at (-2.5,3);
\draw[line width=1pt] (O) -- (A1) -- (A2) -- (A3) -- (A);
%These commands are for drawing a path from O to B.
\coordinate (B1) at (2,0);
\coordinate (B2) at (2,-2.5);
\coordinate (B3) at (5,-2.5);
\coordinate (B4) at (5,-3.5);
\coordinate (B) at (7,-3.5);
\draw[line width=1pt] (O) -- (B1) -- (B2) -- (B3) -- (B4) -- (B);
\draw[help lines,line width=0.1pt,blue] (-10.5, -10.5) grid (10.5,10.5);
\end{axis}
\end{tikzpicture}
\hspace{\fill}
\vskip0.25in
\end{document}
答案1
要使帮助行叠印，必须先将它们打印在以下对象下方。该\draw命令应放在其他元素之前。
下一个问题是线条位置错误。以下命令至少在 (-10, -10) 至 (10, 10) 区域添加网格线：
\draw[
help lines,
line width=0.1pt,
blue,
shift={($(1, 1) - (0, 0)$)},
] (-11, -11) grid[step={($(5, 5) - (0, 0)$)}] (9, 9);
完整示例：
\documentclass{amsart}
\usepackage{tikz}
\usetikzlibrary{calc,angles,positioning}
\usepackage{pgfplots}
\pgfplotsset{compat=1.11}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
xmin=-11,xmax=11,ymin=-11,ymax=11,
axis lines=middle,
enlargelimits={abs=0.5},
axis line style={latex-latex},
ticklabel style={font=\tiny,fill=white},
xlabel style={at={(ticklabel* cs:1)},anchor=north west},
ylabel style={at={(ticklabel* cs:1)},anchor=south west}
]
\draw[
help lines,
line width=0.1pt,
blue,
shift={($(1, 1) - (0, 0)$)},
] (-11, -11) grid[step={($(5, 5) - (0, 0)$)}] (9, 9);
\coordinate (O) at (0,0);
\node[fill=white,circle,inner sep=0pt] (O-label) at ($(O)+(-135:10pt)$) {$O$};
\coordinate (A) at (-2.5,9.5);
\node[fill=white,circle] (A-label) at ($(A)+(-180:10pt)$) {$A$};
\coordinate (B) at (7,-3.5);
\node[fill=white,circle] (B-label) at ($(B)+(-45:10pt)$) {$B$};
\draw[fill] (O) circle (1.5pt);
\draw[fill] (A) circle (1.5pt);
\draw[fill] (B) circle (1.5pt);
%These commands are for drawing a path from O to A.
\coordinate (A1) at (-0.5,0);
\coordinate (A2) at (-.5,3);
\coordinate (A3) at (-2.5,3);
\draw[line width=1pt] (O) -- (A1) -- (A2) -- (A3) -- (A);
%These commands are for drawing a path from O to B.
\coordinate (B1) at (2,0);
\coordinate (B2) at (2,-2.5);
\coordinate (B3) at (5,-2.5);
\coordinate (B4) at (5,-3.5);
\coordinate (B) at (7,-3.5);
\draw[line width=1pt] (O) -- (B1) -- (B2) -- (B3) -- (B4) -- (B);
\end{axis}
\end{tikzpicture}
\end{document}
两个方向从 -11 到 11 的整个绘图区域均可由以下项覆盖：
\begin{scope}
\clip (-11, -11) rectangle (11, 11);
\draw[
help lines,
line width=0.1pt,
blue,
shift={($(1, 1) - (0, 0)$)},
] (-16, -16) grid[step={($(5, 5) - (0, 0)$)}] (10, 10);
\end{scope}
但是，轴刻度标签被帮助线覆盖。因此，我宁愿使用grid环境选项axis：
\begin{axis}[
...,
grid,
grid options={line width=.1pt, draw=gray!30},
]
...
\end{axis}
