我想要创建以下内容：
也就是说，部分边缘不可见的矩形。
我怎样才能做到这一点？
我现在拥有的：
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\node[draw,rectangle,minimum width=8cm,minimum height=2cm] {lorem ipsum};
\end{tikzpicture}
\end{document}
答案1
不如 Jasper Habicht 的答案优雅，但如果你只需要那个盒子，也许它会更简单。
\documentclass{article}
\usepackage{tikz}
\newcommand{\mybox}[2][black]{%
\begin{tikzpicture}
\node[rectangle,minimum width=8cm,minimum height=2cm, font=\Large] (A) {#2};
\draw[#1, line width = 3pt]
(A.north west) -- +(.3,0) -- (A.north west) -- +(0,-.4)
(A.north east) -- +(-.3,0) -- (A.north east) -- +(0,-.4)
(A.south west) -- +(.3,0) -- (A.south west) -- +(0,.4)
(A.south east) -- +(-.3,0) -- (A.south east) -- +(0,.4)
;
\end{tikzpicture}%
}
\begin{document}
\mybox{lorem ipsum}
\vspace{1cm}
\mybox[red]{lorem ipsum}
\end{document}
编辑：参数长度
\documentclass{article}
\usepackage{tikz}
\newcommand{\mybox}[3][black]{%
\begin{tikzpicture}
\node[rectangle,minimum width=8cm,minimum height=2cm, font=\Large] (A) {#2};
\draw[#1, line width = 3pt]
(A.north west) -- +(#3,0) -- (A.north west) -- +(0,-#3)
(A.north east) -- +(-#3,0) -- (A.north east) -- +(0,-#3)
(A.south west) -- +(#3,0) -- (A.south west) -- +(0,#3)
(A.south east) -- +(-#3,0) -- (A.south east) -- +(0,#3)
;
\end{tikzpicture}%
}
\begin{document}
\mybox{lorem ipsum}{.3}
\vspace{1cm}
\mybox[red]{lorem ipsum}{.3}
\vspace{1cm}
\mybox{lorem ipsum}{.4}
\vspace{1cm}
\mybox[green]{lorem ipsum}{.4}
\vspace{1cm}
\mybox{lorem ipsum}{.7}
\vspace{1cm}
\mybox[cyan]{lorem ipsum}{.7}
\end{document}
答案2
最好的办法可能是创建你自己的形状。
在这里，考虑 s 也变得容易得多outer sep。
\documentclass{article}
\usepackage{tikz}
\pgfset{corners rectangle size/.initial=10pt}
\makeatletter
\pgfdeclareshape{corners rectangle}{%
\inheritsavedanchors[from=rectangle]%
\inheritanchorborder[from=rectangle]%
\inheritanchor[from=rectangle]{north}%
\inheritanchor[from=rectangle]{north west}%
\inheritanchor[from=rectangle]{north east}%
\inheritanchor[from=rectangle]{center}%
\inheritanchor[from=rectangle]{west}%
\inheritanchor[from=rectangle]{east}%
\inheritanchor[from=rectangle]{mid}%
\inheritanchor[from=rectangle]{mid west}%
\inheritanchor[from=rectangle]{mid east}%
\inheritanchor[from=rectangle]{base}%
\inheritanchor[from=rectangle]{base west}%
\inheritanchor[from=rectangle]{base east}%
\inheritanchor[from=rectangle]{south}%
\inheritanchor[from=rectangle]{south west}%
\inheritanchor[from=rectangle]{south east}%
\foregroundpath{
% store lower right in xa/ya and upper right in xb/yb
\southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
\northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y
\pgfmathsetlength\pgf@xc{\pgfkeysvalueof{/pgf/outer xsep}}%
\pgfmathsetlength\pgf@yc{\pgfkeysvalueof{/pgf/outer ysep}}%
\advance\pgf@xa by \pgf@xc \advance\pgf@xb by -\pgf@xc
\advance\pgf@ya by \pgf@yc \advance\pgf@yb by -\pgf@yc
\pgfmathsetlength\pgfutil@tempdima{\pgfkeysvalueof{/pgf/corners rectangle size}}%
\pgfpathmoveto{\pgfqpoint{\dimexpr\pgf@xa+\pgfutil@tempdima}{\pgf@ya}}%
\pgfpathlineto{\pgfqpoint{\pgf@xa}{\pgf@ya}}%
\pgfpathlineto{\pgfqpoint{\pgf@xa}{\dimexpr\pgf@ya+\pgfutil@tempdima}}%
\pgfpathmoveto{\pgfqpoint{\dimexpr\pgf@xa+\pgfutil@tempdima}{\pgf@yb}}%
\pgfpathlineto{\pgfqpoint{\pgf@xa}{\pgf@yb}}%
\pgfpathlineto{\pgfqpoint{\pgf@xa}{\dimexpr\pgf@yb-\pgfutil@tempdima}}%
\pgfpathmoveto{\pgfqpoint{\dimexpr\pgf@xb-\pgfutil@tempdima}{\pgf@ya}}%
\pgfpathlineto{\pgfqpoint{\pgf@xb}{\pgf@ya}}%
\pgfpathlineto{\pgfqpoint{\pgf@xb}{\dimexpr\pgf@ya+\pgfutil@tempdima}}%
\pgfpathmoveto{\pgfqpoint{\dimexpr\pgf@xb-\pgfutil@tempdima}{\pgf@yb}}%
\pgfpathlineto{\pgfqpoint{\pgf@xb}{\pgf@yb}}%
\pgfpathlineto{\pgfqpoint{\pgf@xb}{\dimexpr\pgf@yb-\pgfutil@tempdima}}%
\pgfsetarrowsstart{}%
\pgfsetarrowsend{}%
}%
}%
\makeatother
\begin{document}
\begin{tikzpicture}[minimum width=8cm, minimum height=2cm, nodes=corners rectangle]
\node[draw] {lorem ipsum};
\node[corners rectangle size=15pt, draw=red, thick] at (0, -3) (a) {lorem ipsum};
\foreach \ang in {5,...,20} \draw (a.\ang) --+(\ang:.5);
\end{tikzpicture}
\end{document}
作为一个简单的解决方法，您可以使用append after command等等。
我们\pgfsettransform确保使用与应用于节点的相同变换，使得这与绘制这些角的路径无关。
没有考虑outer sep线宽。
\documentclass{article}
\usepackage{tikz}
\tikzset{
draw corners/.style={
append after command={\bgroup
\pgfextra{\pgfsettransform{\csname pgf@sh@nt@\tikzlastnode\endcsname}}
[to path=|-(\tikztotarget)]
([yshift=-\pgfkeysvalueof{/tikz/draw corners size}]\tikzlastnode.north west)
edge[#1] ([xshift= \pgfkeysvalueof{/tikz/draw corners size}]\tikzlastnode.north west)
([yshift=-\pgfkeysvalueof{/tikz/draw corners size}]\tikzlastnode.north east)
edge[#1] ([xshift=-\pgfkeysvalueof{/tikz/draw corners size}]\tikzlastnode.north east)
([yshift= \pgfkeysvalueof{/tikz/draw corners size}]\tikzlastnode.south east)
edge[#1] ([xshift=-\pgfkeysvalueof{/tikz/draw corners size}]\tikzlastnode.south east)
([yshift= \pgfkeysvalueof{/tikz/draw corners size}]\tikzlastnode.south west)
edge[#1] ([xshift= \pgfkeysvalueof{/tikz/draw corners size}]\tikzlastnode.south west)
\egroup}},
draw corners size/.initial=10pt}
\begin{document}
\begin{tikzpicture}[rectangle, minimum width=8cm, minimum height=2cm]
\path[rotate=30]node[rotate=10, draw corners] at (0,0) {lorem ipsum};
\tikzset{draw corners size=15pt}
\node[scale=.5, draw corners={red, thick}] at (0,-3) {lorem ipsum};
\end{tikzpicture}
\end{document}
您还可以使用它path picture来避免嵌套路径：
\documentclass{article}
\usepackage{tikz}
\tikzset{
draw corners/.style={
path picture={
\draw[#1]
(path picture bounding box.north west)
+(\pgflinewidth,-\pgfkeysvalueof{/tikz/draw corners size}) |-
+(\pgfkeysvalueof{/tikz/draw corners size},-\pgflinewidth)
(path picture bounding box.south west)
+(\pgflinewidth,\pgfkeysvalueof{/tikz/draw corners size}) |-
+(\pgfkeysvalueof{/tikz/draw corners size},\pgflinewidth)
(path picture bounding box.north east)
+(-\pgflinewidth,-\pgfkeysvalueof{/tikz/draw corners size}) |-
+(-\pgfkeysvalueof{/tikz/draw corners size},-\pgflinewidth)
(path picture bounding box.south east)
+(-\pgflinewidth,\pgfkeysvalueof{/tikz/draw corners size}) |-
+(-\pgfkeysvalueof{/tikz/draw corners size},\pgflinewidth);
}
},
draw corners size/.initial=10pt
}
\begin{document}
\begin{tikzpicture}
\node[draw corners, rectangle, minimum width=8cm, minimum height=2cm]
at (0,0) {lorem ipsum};
\end{tikzpicture}
\end{document}
答案3
一个没有 tikz 的选项：只有一张桌子。
\documentclass[twocolumn]{article}
\usepackage{lipsum,parskip}
\usepackage{tabulary}
\def\notecorner#1{\medskip\par{\noindent\centering\begin{tabulary}{\linewidth}{cJc}
\cline{1-1}\cline{3-3}\multicolumn{1}{|c}{}&&\multicolumn{1}{c|}{}\\
&\\\multicolumn{1}{|c}{} & & \multicolumn{1}{c|}{}\\
\cline{1-1}\cline{3-3}\end{tabulary}\medskip\par}}
\begin{document}
\lipsum[1][1-5]
\notecorner{\lipsum[2][1]}
\lipsum[3][1-5]
\end{document}
答案4
基于@CarLaTeX 的回答， 这个
- 支持使用
x=<dimen>, y=<dimen>改变角落大小， - 确保每条线段仅绘制一次。（以前水平线段绘制两次。）
\documentclass{article}
\usepackage{tikz}
\newcommand{\mybox}[2][black]{%
\begin{tikzpicture}
\node[rectangle, minimum width=8cm, minimum height=2cm, font=\Large] (A) {#2};
\draw[x=.3cm, y=.4cm, line width = 3pt, #1]
(A.north west) +( 1,0) -- (A.north west) -- +(0,-1)
(A.north east) +(-1,0) -- (A.north east) -- +(0,-1)
(A.south west) +( 1,0) -- (A.south west) -- +(0, 1)
(A.south east) +(-1,0) -- (A.south east) -- +(0, 1)
;
\end{tikzpicture}%
}
\begin{document}
\mybox{lorem ipsum}
\bigskip
\mybox[red, x=1.5cm, y=.2cm]{lorem ipsum}
\bigskip
\mybox[cyan!50, dotted, x=.5cm, y=.5cm, rounded corners=.2cm]{lorem ipsum}
\end{document}
