How I can highlight equation as given below:
[Tex/LaTex] How to highlight equations in mathematics
highlighting
Related Solutions
You could use TikZ, and
- the
fitlibrary for creating nodes fitting the desired area, - a style for the highlighted node, so separated from the code and easy to change,
- the TikZ options
overlayandremember picture, so you can later refer to those nodes, for example for drawing arrows and annotations later.
To demonstrate why it's useful to have nodes for reference, I created an example, which shows transposing a matrix, highlights a submatrix both in the original matrix and the result, connected by an arrow and annotated:
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{fit}
\tikzset{%
highlight/.style={rectangle,rounded corners,fill=red!15,draw,
fill opacity=0.5,thick,inner sep=0pt}
}
\newcommand{\tikzmark}[2]{\tikz[overlay,remember picture,
baseline=(#1.base)] \node (#1) {#2};}
%
\newcommand{\Highlight}[1][submatrix]{%
\tikz[overlay,remember picture]{
\node[highlight,fit=(left.north west) (right.south east)] (#1) {};}
}
\begin{document}
\[
M = \left(\begin{array}{*5{c}}
\tikzmark{left}{1} & 2 & 3 & 4 & 5 \\
6 & 7 & 8 & 9 & 10 \\
11 & 12 & \tikzmark{right}{13} & 14 & 15 \\
16 & 17 & 18 & 19 & 20
\end{array}\right)
\Highlight[first]
\qquad
M^T = \left(\begin{array}{*5{c}}
\tikzmark{left}{1} & 6 & 11 & 16 \\
2 & 7 & 12 & 17 \\
3 & 8 & \tikzmark{right}{13} & 18 \\
4 & 9 & 14 & 19 \\
5 & 10 & 15 & 20
\end{array}\right)
\]
\Highlight[second]
%
\tikz[overlay,remember picture] {
\draw[->,thick,red,dashed] (first) -- (second) node [pos=0.66,above] {Transpose};
\node[above of=first] {$N$};
\node[above of=second] {$N^T$};
}
\end{document}
You can use the bclogo and/or mdframed and or tcolorbox packages.
The main difference is that boxes produced using mdframed or tcolorbox might allow page breaks.
A little example; the first box was produced using bclogo; the second one, using mdframed; the third one (similar to the second one) and the fourth one were produced using tcolorbox:
\documentclass{book}
\usepackage{xcolor}
\usepackage[tikz]{bclogo}
\usepackage[framemethod=tikz]{mdframed}
\usepackage{lipsum}
\usepackage[many]{tcolorbox}
\definecolor{bgblue}{RGB}{245,243,253}
\definecolor{ttblue}{RGB}{91,194,224}
\mdfdefinestyle{mystyle}{%
rightline=true,
innerleftmargin=10,
innerrightmargin=10,
outerlinewidth=3pt,
topline=false,
rightline=true,
bottomline=false,
skipabove=\topsep,
skipbelow=\topsep
}
\newtcolorbox{myboxi}[1][]{
breakable,
title=#1,
colback=white,
colbacktitle=white,
coltitle=black,
fonttitle=\bfseries,
bottomrule=0pt,
toprule=0pt,
leftrule=3pt,
rightrule=3pt,
titlerule=0pt,
arc=0pt,
outer arc=0pt,
colframe=black,
}
\newtcolorbox{myboxii}[1][]{
breakable,
freelance,
title=#1,
colback=white,
colbacktitle=white,
coltitle=black,
fonttitle=\bfseries,
bottomrule=0pt,
boxrule=0pt,
colframe=white,
overlay unbroken and first={
\draw[red!75!black,line width=3pt]
([xshift=5pt]frame.north west) --
(frame.north west) --
(frame.south west);
\draw[red!75!black,line width=3pt]
([xshift=-5pt]frame.north east) --
(frame.north east) --
(frame.south east);
},
overlay unbroken app={
\draw[red!75!black,line width=3pt,line cap=rect]
(frame.south west) --
([xshift=5pt]frame.south west);
\draw[red!75!black,line width=3pt,line cap=rect]
(frame.south east) --
([xshift=-5pt]frame.south east);
},
overlay middle and last={
\draw[red!75!black,line width=3pt]
(frame.north west) --
(frame.south west);
\draw[red!75!black,line width=3pt]
(frame.north east) --
(frame.south east);
},
overlay last app={
\draw[red!75!black,line width=3pt,line cap=rect]
(frame.south west) --
([xshift=5pt]frame.south west);
\draw[red!75!black,line width=3pt,line cap=rect]
(frame.south east) --
([xshift=-5pt]frame.south east);
},
}
\begin{document}
\renewcommand\bcStyleTitre[1]{\large\textcolor{ttblue}{#1}}
\begin{bclogo}[
couleur=bgblue,
arrondi=0,
logo=\bcbombe,
barre=none,
noborder=true]{Commom Programming Error}
\itshape\lipsum[4]
\end{bclogo}
\begin{mdframed}[style=mystyle,frametitle=Web addresses in text]
\lipsum[4]
\end{mdframed}
\begin{myboxi}[Web addresses in text]
\lipsum[4]
\end{myboxi}
\begin{myboxii}[Web addresses in text]
\lipsum[4]
\end{myboxii}
\end{document}
The packages offer you many customization possibilities and the documentations contain numerous examples.
For the second framed box, here's another option using TikZ:
\documentclass{book}
\usepackage{environ}
\usepackage{xcolor}
\usepackage[tikz]{bclogo}
\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{lipsum}
\NewEnviron{myremark}[1]
{\par\medskip\noindent
\begin{tikzpicture}
\node[inner sep=0pt] (box) {\parbox[t]{.99\textwidth}{%
\begin{minipage}{.3\textwidth}
\centering\tikz[scale=5]\node[scale=3,rotate=30]{\bclampe};
\end{minipage}%
\begin{minipage}{.65\textwidth}
\textbf{#1}\par\smallskip
\BODY
\end{minipage}\hfill}%
};
\draw[red!75!black,line width=3pt]
( $ (box.north east) + (-5pt,3pt) $ ) -- ( $ (box.north east) + (0,3pt) $ ) -- ( $ (box.south east) + (0,-3pt) $ ) -- + (-5pt,0);
\draw[red!75!black,line width=3pt]
( $ (box.north west) + (5pt,3pt) $ ) -- ( $ (box.north west) + (0,3pt) $ ) -- ( $ (box.south west) + (0,-3pt) $ ) -- + (5pt,0);
\end{tikzpicture}\par\medskip%
}
\begin{document}
\lipsum[4]
\begin{myremark}{Web addresses in texts}
\lipsum[4]
\end{myremark}
\lipsum[4]
\end{document}
Best Answer
You can play around with the spacing:
Ultimately you can just use
\colorbox{<color>}{<stuff>}to highlight content. I've added\strutto ensure a consistent baseline height of the resulting coloured box, as well as using text where it seemed necessary. Note that<stuff>inside a\colorboxis set in text mode.