我要用阿拉伯语写一本书，背景是页边空白处带有两种颜色条纹的图像。我将其包含在文档中，没有任何问题，使用了 bachground 包。但是我的定理和例子等的标签也写在页边空白处，当它叠加在条纹上时，效果不是很漂亮，因为它的颜色是白色的。所以我想让定理的矩形和类似的矩形与背景颜色相同，条纹也相同，蓝色在“黄色”之后是白色（好像背景是反转的，示例在背景中，图像在文档中！）。我给出了原始图像（用作背景）和将此图像作为背景获得的文档示例。我想获得与背景颜色相同的 Tikz 矩形，一个蓝色扇区，一个白色扇区，一个黄色扇区。
我给出了 tex 文档。请注意，给出的方框尺寸是经验性的，并不重要，因为我现在不知道条纹的确切位置。编辑稍后会将其发送给我。
\documentclass[14pt,twoside]{book}
\usepackage{extsizes}
\usepackage{amsmath,amssymb}
\usepackage[most]{tcolorbox}
\usepackage{array}
\usepackage[total={165mm,235mm},includefoot,includehead,headheight=14pt,centering,twoside]{geometry}%
\usepackage[pages=some]{background}
\usepackage{polyglossia}
\setmainlanguage[numerals=maghrib]{arabic}
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2,AutoFakeSlant=-0.02]{Traditional Arabic}
\setmonofont{DejaVu Sans Mono}
\let\arabicfonttt\ttfamily
\setsansfont[Script=Arabic,Scale=1.5]{Traditional Arabic}
\backgroundsetup{scale=1,opacity=1,angle=0,contents={\includegraphics[width=\paperwidth,height=\paperheight]{R3}}}
\BgThispage
\tikzstyle{whitebox} =
[draw=white, thick, scale=.707, fill=white,%
line width=0.3pt, text=black, rectangle,
font=\Large,
left, minimum height=.5cm, minimum width=1.9cm]
\newcounter{example}
\newtcolorbox[auto counter,
number within=section,
number freestyle={\noexpand\arabic{section}\noexpand\alph{\tcbcounter}}]{example}[2][]{%
enhanced,
left=-5pt,
right=-5pt,
colback=gray!40,
colframe=white,
top=1mm,
bottom=8.5mm,
enlarge top by=\baselineskip/2+1mm,
enlarge top at break by=0mm,pad at break=2mm,
fontupper=\normalsize,
label={#2},
overlay unbroken and first={%
\node[whitebox]
at ([xshift=1.5cm,yshift=-.9cm]frame.north east)
{\strut\RL{\setlength{\extrarowheight}{-30.5pt}\textbf{$\begin{array}{c}
\hline
\rule{0pt}{2ex}
\mbox{Ex}
\\
\mbox{\large\thetcbcounter}
\rule{0pt}{1.5ex}
\end{array}$}}};},
breakable,
before=\par\smallskip\centering,
width=\textwidth, %%% change the width here.
arc=0pt,outer arc=0pt,
extrude right by=5pt,
extrude left by=5pt,
#1}%
\begin{document}
\setcounter{section}{1}
\begin{example}{lab:exam:1}
\LR{The text of the example (labeled here Ex) is usually in arabic, in RightToLeft mode}
\end{example}
\end{document}
好的文件。
更新文档以包含偶数/奇数命令来插入不同的背景
它使用 Thomas F. Sturm 介绍的方法。我的目标是只在偶数页上使用它，在奇数页上，使用“boxwhite”真正白色，而不是黄色和蓝色。
我给出了偶数/奇数得到的结果。
守则
\documentclass[14pt,twoside]{book}
\usepackage{extsizes}
\usepackage{amsmath,amssymb,lipsum}
\usepackage[most]{tcolorbox}
\usepackage{array}
\usepackage[total={165mm,235mm},includefoot,includehead,headheight=14pt,centering,twoside]{geometry}%
\usepackage[pages=some]{background}
\usepackage{polyglossia}
\setmainlanguage[numerals=maghrib]{arabic}
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2,AutoFakeSlant=-0.02]{Traditional Arabic}
\setmonofont{DejaVu Sans Mono}
\let\arabicfonttt\ttfamily
\setsansfont[Script=Arabic,Scale=1.5]{Traditional Arabic}
\definecolor{myBlue}{rgb}{0.388235,0.454902,0.525490}
\definecolor{myYellow}{rgb}{0.643137,0.564706,0.388235}
\usepackage{background}
\usepackage{ifthen}
\AddEverypageHook{%
\ifthenelse{\isodd{\value{page}}}%
{
\backgroundsetup{
%position={0,0},
scale=1,
opacity=1,
angle=0,
contents={%
\includegraphics[width=\paperwidth,height=\paperheight]{L3}
}%
}
}%
{
\backgroundsetup{
%position={0,1},
scale=1,
opacity=1,
angle=0,
contents={%
\begin{tikzpicture}
\path (0,0)--(-\textwidth-20mm,0);
\draw[line width=5mm,myBlue](0,0)--++(0,\paperheight);
\draw[line width=5mm,myYellow](0.7,0)--++(0,\paperheight);
\end{tikzpicture}
}%
}
}%
\BgMaterial}
\tikzstyle{whitebox} =
[%draw=white,
thick, scale=.707,%fill=white, fill opacity=0.6,%
line width=0.3pt, text=black, rectangle, inner sep=3mm,
font=\Large,
left, minimum height=.5cm, minimum width=1.9cm]
\newcounter{example}
\newtcolorbox[auto counter,
number within=section,
number freestyle={\noexpand\arabic{section}\noexpand\alph{\tcbcounter}}]{example}[2][]%
{%
enhanced,
left=-5pt,
right=-5pt,
colback=gray!40,
colframe=white,
top=1mm,
bottom=8.5mm,
enlarge top by=\baselineskip/2+1mm,
fontupper=\normalsize,
label={#2},
overlay unbroken and first={%
\pgfdeclarelayer{background}
\pgfsetlayers{background,main}
\node[whitebox] (B)
at ([xshift=1.5cm,yshift=-.9cm]frame.north east)
{\strut\RL{\setlength{\extrarowheight}{-30.5pt}\textbf{$\begin{array}{c}
\hline
\rule{0pt}{2ex}
\mbox{Ex}
\\
\mbox{\large\thetcbcounter}
\rule{0pt}{1.5ex}
\end{array}$}}};
\begin{pgfonlayer}{background}
\draw [line width=5mm,myYellow]([xshift=3.5mm]frame.south east|-B.south)-- ([xshift=3.5mm]frame.north east|-B.north);
\draw [line width=5mm,myBlue]([xshift=10.5mm]frame.south east|-B.south)-- ([xshift=10.5mm]frame.north east|-B.north);
\end{pgfonlayer}
},
breakable,
before=\par\smallskip\centering,
width=\textwidth, %%% change the width here.
arc=0pt,outer arc=0pt,
extrude right by=5pt,
extrude left by=5pt,
enlarge top at break by=0mm,pad at break=2mm,
#1%
}%
\begin{document}
\setcounter{section}{1}
\begin{example}{lab:exam:1}
\LR{The text of the example (labeled here Ex) is usually in arabic, in RightToLeft mode
\lipsum[1]}
\end{example}
\newpage
\begin{example}{lab:exam:2}
\LR{The text of the example (labeled here Ex) is usually in arabic, in RightToLeft mode
\lipsum[1]}
\end{example}
\end{document}
我发布了第二个更新，其中包含页面的精确尺寸和背景图像。我的问题是如何准确确定底图（偶数页）的尺寸（这里是经验性的……），以便准确叠加底图和背景？……在这里找到 .tex 文件及其汇编，以及背景图像。框中使用的阿拉伯语单词 (مثال) 表示示例。
tex 文件
\documentclass[12pt]{书}
\usepackage{amsmath,amssymb}
\usepackage[most]{tcolorbox}
\usepackage{changepage}%<----------------- To check even / odd
\strictpagecheck
\usepackage{lipsum}
\usepackage{array}
\usepackage[paperwidth=170mm,paperheight=240mm,hmargin=2.5cm,vmargin=2.5cm,headheight=14pt,includefoot]{geometry}%
\usepackage[pages=some]{background}
\usepackage{polyglossia}
\setmainlanguage[numerals=maghrib]{arabic}
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2,AutoFakeSlant=-0.02]{Traditional Arabic}
\newfontfamily\englishfont[Scale=1]{Times New Roman}
\setmonofont{DejaVu Sans Mono}
\let\arabicfonttt\ttfamily
\setsansfont[Script=Arabic,Scale=1.5]{Traditional Arabic}
\definecolor{myBlue}{rgb}{0.388235,0.454902,0.525490}
\definecolor{myYellow}{rgb}{0.643137,0.564706,0.388235}
\usepackage{background}
\usepackage{ifthen}
\AddEverypageHook{%
\ifthenelse{\isodd{\value{page}}}%
{
\backgroundsetup{
%position={0,0},
scale=1,
opacity=1,
angle=0,
contents={%
\includegraphics[width=\paperwidth,height=\paperheight]{L}
}%
}
}%
{
\backgroundsetup{
%position={0,1},
scale=1,
opacity=1,
angle=0,
contents={%
\includegraphics[width=\paperwidth,height=\paperheight]{R}
}%
}
}%
\BgMaterial}
\tikzstyle{whitebox} =
[%draw=white,
thick, scale=.75, %fill=white,%
line width=0.3pt, text=black, rectangle,
font=\Large,
left, minimum height=.5cm, minimum width=1.9cm]
\tikzstyle{yellowbox} =
[fill=myYellow, inner sep=1.5pt,
thick, scale=.74, draw=myBlue,
line width=1pt, text=black, rectangle,
font=\Large,left]
\newcounter{example}
\newtcolorbox[auto counter,number within=section,number freestyle={\noexpand\arabic{section}\noexpand\alph{\tcbcounter}}]{example}[2][]{%
enhanced,top=0mm,left=-5pt,right=-5pt,enlarge top by=\baselineskip/2+1mm,enlarge top at break by=0mm, pad at break=2mm,fontupper=\normalsize,
check odd page,% <---------------------------------
overlay unbroken and first={%
\pgfdeclarelayer{background}
\pgfsetlayers{background,main}
\ifoddpage
\node[yellowbox] (B)
at ([xshift=12mm,yshift=-.58cm]frame.north east)
{\strut\RL{\setlength{\extrarowheight}{-30.5pt}\textbf{$\begin{array}{c}
\hline
\rule{0pt}{2ex}
\mbox{\RL{مثال}}
\\
\mbox{\Large\thetcbcounter}
\rule{0pt}{1.5ex}
\end{array}$}}};
\else
\node[whitebox] (B)
at ([xshift=2cm,yshift=-.73cm]frame.north east)
{\strut\RL{\setlength{\extrarowheight}{-30.5pt}\textbf{$\begin{array}{c}
\hline
\rule{0pt}{2ex}
\mbox{\RL{مثال}}
\\
\mbox{\Large\thetcbcounter}
\rule{0pt}{1.5ex}
\end{array}$}}};
\begin{pgfonlayer}{background}
\draw [line width=4.7mm,myYellow]([xshift=10mm,yshift=.5mm]frame.south east|-B.south)-- ([xshift=10mm,yshift=.5mm]frame.north east|-B.north);
\draw [line width=4.7mm,myBlue]([xshift=16mm,yshift=.5mm]frame.south east|-B.south)-- ([xshift=16mm,yshift=.5mm]frame.north east|-B.north);
\end{pgfonlayer}
\fi%
},
breakable,before=\par\smallskip\vspace{-10pt}\centering,arc=0pt,outer arc=0pt,colframe=white,colback=white,
width=\textwidth, borderline north={2pt}{-3pt}{myBlue},borderline south={2pt}{5pt}{myBlue},
label={#2},
#1}
\begin{document}
\setcounter{section}{1}
\begin{example}{lab:exam:1}
\LR{\lipsum[1]}
\end{example}
\newpage
\begin{example}{lab:exam:2}
\LR{\lipsum[1]}
\end{example}
\end{document}
获得的pdf文件：
背景图像..
答案1
正如我现在所看到的，我的答案与最初打算回答的问题有点偏差。不过，我觉得反转颜色的想法很好，如果你不介意的话，我会把答案留给未来寻找类似答案的读者。
我必须模拟缺失的R3背景图片。因此，您必须根据实际应用调整以下长度设置。我的情况如下：
我whitebox稍微调整了一下（我删除了颜色white）并添加了一个underlay设置tcolorbox。underlay包含反转的彩色条纹。
我使用了underlay，因为它独立于overlay仅为第一页和未间断的页面设置的。
最终的代码如下：
\documentclass[14pt,twoside]{book}
\usepackage{extsizes}
\usepackage{amsmath,amssymb}
\usepackage[most]{tcolorbox}
\usepackage{array}
\usepackage[total={165mm,235mm},includefoot,includehead,headheight=14pt,centering,twoside]{geometry}%
\usepackage[pages=some]{background}
\usepackage{polyglossia}
\setmainlanguage[numerals=maghrib]{arabic}
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2,AutoFakeSlant=-0.02]{Traditional Arabic}
\setmonofont{DejaVu Sans Mono}
\let\arabicfonttt\ttfamily
\setsansfont[Script=Arabic,Scale=1.5]{Traditional Arabic}
\backgroundsetup{scale=1,opacity=1,angle=0,contents={%
%\includegraphics[width=\paperwidth,height=\paperheight]{R3}}
% Mock up, because I do not have the R3 image
\begin{tikzpicture}
\path (0,0)--(-\textwidth-20mm,0);
\draw[line width=5mm,blue!25!gray](0,0)--++(0,\paperheight);
\draw[line width=5mm,yellow!25!gray](0.7,0)--++(0,\paperheight);
\end{tikzpicture}}%
}
\BgThispage
\tikzstyle{whitebox} =
[%draw=white,
thick, scale=.707,% fill=white,%
line width=0.3pt, text=black, rectangle,
font=\Large,
left, minimum height=.5cm, minimum width=1.9cm]
\newcounter{example}
\newtcolorbox[auto counter,
number within=section,
number freestyle={\noexpand\arabic{section}\noexpand\alph{\tcbcounter}}]{example}[2][]%
{%
enhanced,
left=-5pt,
right=-5pt,
colback=gray!40,
colframe=white,
top=1mm,
bottom=8.5mm,
enlarge top by=\baselineskip/2+1mm,
fontupper=\normalsize,
label={#2},
underlay={%
\draw [line width=5mm,yellow!25!gray]([xshift=3.5mm]frame.south east)--([xshift=3.5mm]frame.north east);
\draw [line width=5mm,blue!25!gray]([xshift=10.5mm]frame.south east)--([xshift=10.5mm]frame.north east);
},
overlay unbroken and first={%
\node[whitebox]
at ([xshift=1.5cm,yshift=-.9cm]frame.north east)
{\strut\RL{\setlength{\extrarowheight}{-30.5pt}\textbf{$\begin{array}{c}
\hline
\rule{0pt}{2ex}
\mbox{Ex}
\\
\mbox{\large\thetcbcounter}
\rule{0pt}{1.5ex}
\end{array}$}}};},
breakable,
before=\par\smallskip\centering,
width=\textwidth, %%% change the width here.
arc=0pt,outer arc=0pt,
extrude right by=5pt,
extrude left by=5pt,
enlarge top at break by=0mm,pad at break=2mm,
#1%
}%
\begin{document}
\setcounter{section}{1}
\begin{example}{lab:exam:1}
\LR{The text of the example (labeled here Ex) is usually in arabic, in RightToLeft mode}
\end{example}
\end{document}
作为一种变体，可以向框中添加一些半透明的白色Ex。这样可以得到：
代码如下：
\documentclass[14pt,twoside]{book}
\usepackage{extsizes}
\usepackage{amsmath,amssymb,lipsum}
\usepackage[most]{tcolorbox}
\usepackage{array}
\usepackage[total={165mm,235mm},includefoot,includehead,headheight=14pt,centering,twoside]{geometry}%
\usepackage[pages=some]{background}
\usepackage{polyglossia}
\setmainlanguage[numerals=maghrib]{arabic}
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2,AutoFakeSlant=-0.02]{Traditional Arabic}
\setmonofont{DejaVu Sans Mono}
\let\arabicfonttt\ttfamily
\setsansfont[Script=Arabic,Scale=1.5]{Traditional Arabic}
\backgroundsetup{scale=1,opacity=1,angle=0,contents={%
%\includegraphics[width=\paperwidth,height=\paperheight]{R3}}
% Mock up, because I do not have the R3 image
\begin{tikzpicture}
\path (0,0)--(-\textwidth-20mm,0);
\draw[line width=5mm,blue!25!gray](0,0)--++(0,\paperheight);
\draw[line width=5mm,yellow!25!gray](0.7,0)--++(0,\paperheight);
\end{tikzpicture}}%
}
\BgThispage
\tikzstyle{whitebox} =
[%draw=white,
thick, scale=.707,fill=white, fill opacity=0.6,%
line width=0.3pt, text=black, rectangle, inner sep=3mm,
font=\Large,
left, minimum height=.5cm, minimum width=1.9cm]
\newcounter{example}
\newtcolorbox[auto counter,
number within=section,
number freestyle={\noexpand\arabic{section}\noexpand\alph{\tcbcounter}}]{example}[2][]%
{%
enhanced,
left=-5pt,
right=-5pt,
colback=gray!40,
colframe=white,
top=1mm,
bottom=8.5mm,
enlarge top by=\baselineskip/2+1mm,
fontupper=\normalsize,
label={#2},
underlay={%
\draw [line width=5mm,yellow!25!gray]([xshift=3.5mm]frame.south east)--([xshift=3.5mm]frame.north east);
\draw [line width=5mm,blue!25!gray]([xshift=10.5mm]frame.south east)--([xshift=10.5mm]frame.north east);
},
overlay unbroken and first={%
\node[whitebox]
at ([xshift=1.5cm,yshift=-.9cm]frame.north east)
{\strut\RL{\setlength{\extrarowheight}{-30.5pt}\textbf{$\begin{array}{c}
\hline
\rule{0pt}{2ex}
\mbox{Ex}
\\
\mbox{\large\thetcbcounter}
\rule{0pt}{1.5ex}
\end{array}$}}};},
breakable,
before=\par\smallskip\centering,
width=\textwidth, %%% change the width here.
arc=0pt,outer arc=0pt,
extrude right by=5pt,
extrude left by=5pt,
enlarge top at break by=0mm,pad at break=2mm,
#1%
}%
\begin{document}
\setcounter{section}{1}
\begin{example}{lab:exam:1}
\LR{The text of the example (labeled here Ex) is usually in arabic, in RightToLeft mode
\lipsum[1]}
\end{example}
\end{document}
更新：
根据原帖作者的要求，这里做了一个修改，只反转了 下方的颜色whitebox。这里underlay不需要 。
代码如下：
\documentclass[14pt,twoside]{book}
\usepackage{extsizes}
\usepackage{amsmath,amssymb,lipsum}
\usepackage[most]{tcolorbox}
\usepackage{array}
\usepackage[total={165mm,235mm},includefoot,includehead,headheight=14pt,centering,twoside]{geometry}%
\usepackage[pages=some]{background}
\usepackage{polyglossia}
\setmainlanguage[numerals=maghrib]{arabic}
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2,AutoFakeSlant=-0.02]{Traditional Arabic}
\setmonofont{DejaVu Sans Mono}
\let\arabicfonttt\ttfamily
\setsansfont[Script=Arabic,Scale=1.5]{Traditional Arabic}
\definecolor{myBlue}{rgb}{0.388235,0.454902,0.525490}
\definecolor{myYellow}{rgb}{0.643137,0.564706,0.388235}
\backgroundsetup{scale=1,opacity=1,angle=0,contents={%
%\includegraphics[width=\paperwidth,height=\paperheight]{R3}}
% Mock up, because I do not have the R3 image
\begin{tikzpicture}
\path (0,0)--(-\textwidth-20mm,0);
\draw[line width=5mm,myBlue](0,0)--++(0,\paperheight);
\draw[line width=5mm,myYellow](0.7,0)--++(0,\paperheight);
\end{tikzpicture}}%
}
\BgThispage
\tikzstyle{whitebox} =
[%draw=white,
thick, scale=.707,%fill=white, fill opacity=0.6,%
line width=0.3pt, text=black, rectangle, inner sep=3mm,
font=\Large,
left, minimum height=.5cm, minimum width=1.9cm]
\newcounter{example}
\newtcolorbox[auto counter,
number within=section,
number freestyle={\noexpand\arabic{section}\noexpand\alph{\tcbcounter}}]{example}[2][]%
{%
enhanced,
left=-5pt,
right=-5pt,
colback=gray!40,
colframe=white,
top=1mm,
bottom=8.5mm,
enlarge top by=\baselineskip/2+1mm,
fontupper=\normalsize,
label={#2},
overlay unbroken and first={%
\pgfdeclarelayer{background}
\pgfsetlayers{background,main}
\node[whitebox] (B)
at ([xshift=1.5cm,yshift=-.9cm]frame.north east)
{\strut\RL{\setlength{\extrarowheight}{-30.5pt}\textbf{$\begin{array}{c}
\hline
\rule{0pt}{2ex}
\mbox{Ex}
\\
\mbox{\large\thetcbcounter}
\rule{0pt}{1.5ex}
\end{array}$}}};
\begin{pgfonlayer}{background}
\draw [line width=5mm,myYellow]([xshift=3.5mm]frame.south east|-B.south)--([xshift=3.5mm]frame.north east|-B.north);
\draw [line width=5mm,myBlue]([xshift=10.5mm]frame.south east|-B.south)--([xshift=10.5mm]frame.north east|-B.north);
\end{pgfonlayer}
},
breakable,
before=\par\smallskip\centering,
width=\textwidth, %%% change the width here.
arc=0pt,outer arc=0pt,
extrude right by=5pt,
extrude left by=5pt,
enlarge top at break by=0mm,pad at break=2mm,
#1%
}%
\begin{document}
\setcounter{section}{1}
\begin{example}{lab:exam:1}
\LR{The text of the example (labeled here Ex) is usually in arabic, in RightToLeft mode
\lipsum[1]}
\end{example}
\end{document}
更新 2：
OP 的另一个要求是只为偶数页设置颜色切换。因此，我添加了包changepage和check odd page密钥。所有更改都标记在下面的代码中，该代码会更改偶数页的颜色，并保持奇数页的标签框背景为白色：
\documentclass[14pt,twoside]{book}
\usepackage{changepage}%<----------------- To check even / odd
\strictpagecheck
\usepackage{extsizes}
\usepackage{amsmath,amssymb,lipsum}
\usepackage[most]{tcolorbox}
\usepackage{array}
\usepackage[total={165mm,235mm},includefoot,includehead,headheight=14pt,centering,twoside]{geometry}%
\usepackage[pages=some]{background}
\usepackage{polyglossia}
\setmainlanguage[numerals=maghrib]{arabic}
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2,AutoFakeSlant=-0.02]{Traditional Arabic}
\setmonofont{DejaVu Sans Mono}
\let\arabicfonttt\ttfamily
\setsansfont[Script=Arabic,Scale=1.5]{Traditional Arabic}
\definecolor{myBlue}{rgb}{0.388235,0.454902,0.525490}
\definecolor{myYellow}{rgb}{0.643137,0.564706,0.388235}
\usepackage{background}
\usepackage{ifthen}
\AddEverypageHook{%
\ifthenelse{\isodd{\value{page}}}%
{
\backgroundsetup{
%position={0,0},
scale=1,
opacity=1,
angle=0,
contents={%
\includegraphics[width=\paperwidth,height=\paperheight]{L3}
}%
}
}%
{
\backgroundsetup{
%position={0,1},
scale=1,
opacity=1,
angle=0,
contents={%
\begin{tikzpicture}
\path (0,0)--(-\textwidth-20mm,0);
\draw[line width=5mm,myBlue](0,0)--++(0,\paperheight);
\draw[line width=5mm,myYellow](0.7,0)--++(0,\paperheight);
\end{tikzpicture}
}%
}
}%
\BgMaterial}
\tikzstyle{whitebox} =
[%draw=white,
thick, scale=.707,%fill=white, fill opacity=0.6,%
line width=0.3pt, text=black, rectangle, inner sep=3mm,
font=\Large,
left, minimum height=.5cm, minimum width=1.9cm]
\newcounter{example}
\newtcolorbox[auto counter,
number within=section,
number freestyle={\noexpand\arabic{section}\noexpand\alph{\tcbcounter}}]{example}[2][]%
{%
enhanced,
left=-5pt,
right=-5pt,
colback=gray!40,
colframe=white,
top=1mm,
bottom=8.5mm,
enlarge top by=\baselineskip/2+1mm,
fontupper=\normalsize,
label={#2},
check odd page,% <---------------------------------
overlay unbroken and first={%
\pgfdeclarelayer{background}
\pgfsetlayers{background,main}
\node[whitebox] (B)
at ([xshift=1.5cm,yshift=-.9cm]frame.north east)
{\strut\RL{\setlength{\extrarowheight}{-30.5pt}\textbf{$\begin{array}{c}
\hline
\rule{0pt}{2ex}
\mbox{Ex}
\\
\mbox{\large\thetcbcounter}
\rule{0pt}{1.5ex}
\end{array}$}}};
\ifoddpage\else% <---------------------------------
\begin{pgfonlayer}{background}
\draw [line width=5mm,myYellow]([xshift=3.5mm]frame.south east|-B.south)-- ([xshift=3.5mm]frame.north east|-B.north);
\draw [line width=5mm,myBlue]([xshift=10.5mm]frame.south east|-B.south)-- ([xshift=10.5mm]frame.north east|-B.north);
\end{pgfonlayer}
\fi%
},
breakable,
before=\par\smallskip\centering,
width=\textwidth, %%% change the width here.
arc=0pt,outer arc=0pt,
extrude right by=5pt,
extrude left by=5pt,
enlarge top at break by=0mm,pad at break=2mm,
#1%
}%
\begin{document}
\setcounter{section}{1}
\begin{example}{lab:exam:1}
\LR{The text of the example (labeled here Ex) is usually in arabic, in RightToLeft mode
\lipsum[1]}
\end{example}
\newpage
\begin{example}{lab:exam:2}
\LR{The text of the example (labeled here Ex) is usually in arabic, in RightToLeft mode
\lipsum[1]}
\end{example}
\end{document}
答案2
正如我在评论中提到的，您可以使用\node[whitebox,draw=none,fill=none]...或者您可以将样式的draw=white和选项更改为和。fill=whitewhiteboxdraw=nonefill=none
请注意，设置样式的最新语法是
\tikzset{whitebox/.style={...}}
此外，该选项thick将被后面的选项覆盖line width=0.3pt。
所以我建议使用
\tikzset{
whitebox/.style={
rectangle,
draw=none, fill=none,
scale=.707, line width=.3pt,
text=black, font=\Large, left,
minimum height=.5cm, minimum width=1.9cm
}
}
代码：
\documentclass[14pt,twoside]{book}
\usepackage{extsizes}
\usepackage{amsmath,amssymb}
\usepackage[most]{tcolorbox}
\usepackage{array}
\usepackage[total={165mm,235mm},includefoot,includehead,headheight=14pt,centering,twoside]{geometry}%
\usepackage[pages=some]{background}
\usepackage{polyglossia}
\setmainlanguage[numerals=maghrib]{arabic}
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.2,AutoFakeSlant=-0.02]{Traditional Arabic}
\setmonofont{DejaVu Sans Mono}
\let\arabicfonttt\ttfamily
\setsansfont[Script=Arabic,Scale=1.5]{Traditional Arabic}
\backgroundsetup{scale=1,opacity=1,angle=0,contents={\includegraphics[width=\paperwidth,height=\paperheight]{R3}}}
\BgThispage
\tikzset{
whitebox/.style={
rectangle,
draw=none, fill=none,
scale=.707, line width=.3pt,
text=black, font=\Large, left,
minimum height=.5cm, minimum width=1.9cm
}
}
\newcounter{example}
\newtcolorbox[auto counter,
number within=section,
number freestyle={\noexpand\arabic{section}\noexpand\alph{\tcbcounter}}]{example}[2][]{%
enhanced,
left=-5pt,
right=-5pt,
colback=gray!40,
colframe=white,
top=1mm,
bottom=8.5mm,
enlarge top by=\baselineskip/2+1mm,
enlarge top at break by=0mm,pad at break=2mm,
fontupper=\normalsize,
label={#2},
overlay unbroken and first={%
\node[whitebox]
at ([xshift=1.5cm,yshift=-.9cm]frame.north east)
{\strut\RL{\setlength{\extrarowheight}{-30.5pt}\textbf{$\begin{array}{c}
\hline
\rule{0pt}{2ex}
\mbox{Ex}
\\
\mbox{\large\thetcbcounter}
\rule{0pt}{1.5ex}
\end{array}$}}};},
breakable,
before=\par\smallskip\centering,
width=\textwidth, %%% change the width here.
arc=0pt,outer arc=0pt,
extrude right by=5pt,
extrude left by=5pt,
#1}%
\begin{document}
\pagecolor{green}
\setcounter{section}{1}
\begin{example}{lab:exam:1}
\LR{The text of the example (labeled here Ex) is usually in arabic, in RightToLeft mode}
\end{example}
\end{document}