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使用 Tikz 自定义箭头

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使用 Tikz 自定义箭头

我正在使用 Tikz 包，我想创建一个新的箭头。所以我使用了在互联网上找到的以下代码：

\documentclass[a4paper]{article}
\usepackage{tikz}
\usetikzlibrary{arrows}

\begin{document}

% Code for the new arrow tip, called halfcirc.
\pgfarrowsdeclare{halfcirc}{halfcirc}
{
\arrowsize=0.2pt
\advance\arrowsize by .5\pgflinewidth
\pgfarrowsleftextend{-4\arrowsize-.5\pgflinewidth}
\pgfarrowsrightextend{.5\pgflinewidth}
}
{
\arrowsize=0.2pt
\advance\arrowsize by .5\pgflinewidth
\pgfsetdash{}{0pt} % do not dash
\pgfsetroundjoin % fix join
\pgfsetroundcap % fix cap
\pgfpathmoveto{\pgfpoint{-4\arrowsize}{4\arrowsize}}
\pgfpatharc{90}{-90}{4\arrowsize}
\pgfusepathqstroke
}

% Declare a reversed version called revhalfcirc.
\pgfarrowsdeclarereversed{revhalfcirc}{revhalfcirc}{halfcirc}{halfcirc}

% Demonstration of the arrow tip.
\begin{tikzpicture}
\draw[help lines] (-3,-2) grid (3,2);
\draw[line width=10pt, revhalfcirc-halfcirc] (-2,0) -- (0,0);
\end{tikzpicture}

\end{document}

但弹出一个错误：

! Undefined control sequence.
\pgf@arrow@right@revhalfcirc -> \arrowsize 
                                           =0.2pt \advance \arrowsize by .5\...
l.32 ...pt, revhalfcirc-halfcirc] (-2,0) -- (0,0);

?

有什么问题？我是 Tikz 新手。

答案1

您需要加载tikz提供箭头等支持的库，方法是添加

\usetikzlibrary{arrows}

就在您对包的调用下面tikz。然后，该库提供\arrowsize命令和其他命令。

在您的示例中，代码应如下所示：

\documentclass[a4paper]{article}
\usepackage{tikz}
\usetikzlibrary{arrows}

\begin{document}

% Code for the new arrow tip, called halfcirc.
\pgfarrowsdeclare{halfcirc}{halfcirc}
{
\arrowsize=0.2pt
\advance\arrowsize by .5\pgflinewidth
\pgfarrowsleftextend{-4\arrowsize-.5\pgflinewidth}
\pgfarrowsrightextend{.5\pgflinewidth}
}
{
\arrowsize=0.2pt
\advance\arrowsize by .5\pgflinewidth
\pgfsetdash{}{0pt} % do not dash
\pgfsetroundjoin % fix join
\pgfsetroundcap % fix cap
\pgfpathmoveto{\pgfpoint{-4\arrowsize}{4\arrowsize}}
\pgfpatharc{90}{-90}{4\arrowsize}
\pgfusepathqstroke
}

% Declare a reversed version called revhalfcirc.
\pgfarrowsdeclarereversed{revhalfcirc}{revhalfcirc}{halfcirc}{halfcirc}

% Demonstration of the arrow tip.
\begin{tikzpicture}
\draw[help lines] (-3,-2) grid (3,2);
\draw[line width=10pt, revhalfcirc-halfcirc] (-2,0) -- (0,0);
\end{tikzpicture}

\end{document}

编译后，它会给出以下输出，这似乎正是您所期望的： 输出

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