tikz-绘制一个uml样式的注释框

Question

我可以用 tikz 绘制 uml 样式注释框吗？

下面的图片是从UML复制来的：

我使用 tikz 进行尝试，如下所示：

\documentclass[tikz,margin=3mm]{standalone}
\usetikzlibrary{positioning,shapes.multipart}

\definecolor{activityBackgroundColor}{RGB}{254,254,206}
\definecolor{activityBorderColor}{RGB}{168,0,54}
\definecolor{noteBackgroundColor}{RGB}{251,251,119}
\definecolor{noteBorderColor}{RGB}{168,0,54}
\begin{document}

\begin{tikzpicture}[every text node part/.style={align=center}]

\node (A) [draw=activityBorderColor,fill=activityBackgroundColor,rectangle,rounded corners,] {Hello \\ world};
\node[draw=noteBorderColor,fill=noteBackgroundColor,rectangle,right=2mm of A] {this is \\ a node};
\end{tikzpicture}

\end{document}

输出：

如何才能得到和uml注释框一模一样的风格呢？

Answer 1

有一个shapes.callout图书馆不需要做太多工作就可以达到这个效果。如果你坚持要折角的外观，你可以自己创建一个新的形状（尽管我怀疑这个细节需要做很多工作。）

\documentclass[tikz,margin=3mm]{standalone}
\usetikzlibrary{positioning,shapes.multipart,shapes.callouts}

\definecolor{activityBackgroundColor}{RGB}{254,254,206}
\definecolor{activityBorderColor}{RGB}{168,0,54}
\definecolor{noteBackgroundColor}{RGB}{251,251,119}
\definecolor{noteBorderColor}{RGB}{168,0,54}
\begin{document}

\begin{tikzpicture}[every text node part/.style={align=center}]

\node (A) [draw=activityBorderColor,fill=activityBackgroundColor,rectangle,rounded corners,] {Hello \\ world};
\node[draw=noteBorderColor,fill=noteBackgroundColor,rectangle callout,callout relative pointer={(-1,0)},right =of A] {this is \\ a node};
\end{tikzpicture}

\end{document}

Answer 2

如果你想在 Alan Munn 的答案中添加折叠的小角：

\documentclass[tikz,margin=3mm]{standalone}
\usetikzlibrary{positioning,%shapes.multipart,
    shapes.callouts}
\definecolor{activityBackgroundColor}{RGB}{254,254,206}
\definecolor{activityBorderColor}{RGB}{168,0,54}
\definecolor{noteBackgroundColor}{RGB}{251,251,119}
\definecolor{noteBorderColor}{RGB}{168,0,54}
\begin{document}

    \begin{tikzpicture}[every text node part/.style={align=center}]
        \node (A) [draw=activityBorderColor,fill=activityBackgroundColor,rectangle,rounded corners] {Hello \\ world};
        \node[draw=noteBorderColor,fill=noteBackgroundColor,rectangle callout,callout relative pointer={(-1,0)},right =3em of A] (B) {this is \\ a node};
        \draw[white, fill=white] ([xshift=-4pt]B.north east) -- (B.north east) -- ([yshift=-4pt]B.north east);
        \draw[noteBorderColor, fill=noteBackgroundColor, line width=.4pt] ([shift={(-4pt,-.2pt)}]B.north east) -- ([shift={(-4pt,-4pt)}]B.north east)  [rounded corners=.01pt]-- ([shift={(-.2pt,-4pt)}]B.north east) -- cycle;
    \end{tikzpicture}

\end{document}