Eu gosto das cores da seção de código SO. então desejo usá-lo como cor de fundo da caixa de listagem de código.
Eu uso uma ferramenta de captura de tela para capturar a cor de fundo do código para png e, em seguida, uso a ferramenta GIMP para verificar se o valor RGB é (245.245.245). mas quando eu uso o código abaixo para definir essa cor e usá-la como cor de fundo, parece que a cor é muito escura do que as cores do código SO.
\documentclass[border=2pt]{standalone}
%\usepackage[a4paper,margin=1cm]{geometry}
\usepackage{listings}
\usepackage{xcolor}
\definecolor{mygray}{RGB}{245,245,245}
\definecolor{mygreen}{rgb}{0,0.6,0}
\definecolor{mygray}{rgb}{0.5,0.5,0.5}
\definecolor{mymauve}{rgb}{0.58,0,0.82}
\lstset{ %
backgroundcolor=\color{mygray}, % choose the background color; you must add \usepackage{color} or \usepackage{xcolor}
basicstyle=\footnotesize, % the size of the fonts that are used for the code
breakatwhitespace=false, % sets if automatic breaks should only happen at whitespace
breaklines=true, % sets automatic line breaking
captionpos=b, % sets the caption-position to bottom
commentstyle=\color{mygreen}, % comment style
deletekeywords={...}, % if you want to delete keywords from the given language
escapeinside={\%*}{*)}, % if you want to add LaTeX within your code
extendedchars=true, % lets you use non-ASCII characters; for 8-bits encodings only, does not work with UTF-8
frame=single, % adds a frame around the code
keepspaces=true, % keeps spaces in text, useful for keeping indentation of code (possibly needs columns=flexible)
keywordstyle=\color{blue}, % keyword style
language=c, % the language of the code
otherkeywords={*,...}, % if you want to add more keywords to the set
numbers=left, % where to put the line-numbers; possible values are (none, left, right)
numbersep=5pt, % how far the line-numbers are from the code
numberstyle=\tiny\color{mygray}, % the style that is used for the line-numbers
rulecolor=\color{black}, % if not set, the frame-color may be changed on line-breaks within not-black text (e.g. comments (green here))
showspaces=false, % show spaces everywhere adding particular underscores; it overrides 'showstringspaces'
showstringspaces=false, % underline spaces within strings only
showtabs=false, % show tabs within strings adding particular underscores
stepnumber=2, % the step between two line-numbers. If it's 1, each line will be numbered
stringstyle=\color{mymauve}, % string literal style
tabsize=2, % sets default tabsize to 2 spaces
title=\lstname % show the filename of files included with \lstinputlisting; also try caption instead of title
}
\begin{document}
\begin{lstlisting}
#include <stdio.h>
int main() {
print "hello world\n";
}
\end{lstlisting}
\end{document}
Saída
O que há de errado com meu código de cores de fundo?
Responder1
O pacote xcolortem duas variantes para configurar o espaço de cores RGB, dependendo se letras maiúsculas são usadas ou não ( RGBvs. rgb):
\definecolor{mygray}{RGB}{245,245,245}
que é uma representação bem conhecida onde min é0e máximo é255, e
\definecolor{mygray}{rgb}{0.5,0.5,0.5}
que tem outra escala onde min é0,0e máximo é1,0.
No seu MWE você na terceira \definecolorvocê de fato redefiniu mygraypara a variante mais escura, já que as seguintes linhas são iguais:
\definecolor{mygray}{rgb}{0.5,0.5,0.5}
\definecolor{mygray}{RGB}{127,127,127}
Se você remover esta linha, tudo ficará bem:
\documentclass[border=2pt]{standalone}
%\usepackage[a4paper,margin=1cm]{geometry}
\usepackage{listings}
\usepackage{xcolor}
\definecolor{mygray}{RGB}{245,245,245}
\definecolor{mygreen}{rgb}{0,0.6,0}
%\definecolor{mygray}{rgb}{0.5,0.5,0.5}
\definecolor{mymauve}{rgb}{0.58,0,0.82}
\lstset{ %
backgroundcolor=\color{mygray}, % choose the background color; you must add \usepackage{color} or \usepackage{xcolor}
basicstyle=\footnotesize, % the size of the fonts that are used for the code
breakatwhitespace=false, % sets if automatic breaks should only happen at whitespace
breaklines=true, % sets automatic line breaking
captionpos=b, % sets the caption-position to bottom
commentstyle=\color{mygreen}, % comment style
deletekeywords={...}, % if you want to delete keywords from the given language
escapeinside={\%*}{*)}, % if you want to add LaTeX within your code
extendedchars=true, % lets you use non-ASCII characters; for 8-bits encodings only, does not work with UTF-8
frame=single, % adds a frame around the code
keepspaces=true, % keeps spaces in text, useful for keeping indentation of code (possibly needs columns=flexible)
keywordstyle=\color{blue}, % keyword style
language=c, % the language of the code
otherkeywords={*,...}, % if you want to add more keywords to the set
numbers=left, % where to put the line-numbers; possible values are (none, left, right)
numbersep=5pt, % how far the line-numbers are from the code
numberstyle=\tiny\color{mygray}, % the style that is used for the line-numbers
rulecolor=\color{black}, % if not set, the frame-color may be changed on line-breaks within not-black text (e.g. comments (green here))
showspaces=false, % show spaces everywhere adding particular underscores; it overrides 'showstringspaces'
showstringspaces=false, % underline spaces within strings only
showtabs=false, % show tabs within strings adding particular underscores
stepnumber=2, % the step between two line-numbers. If it's 1, each line will be numbered
stringstyle=\color{mymauve}, % string literal style
tabsize=2, % sets default tabsize to 2 spaces
title=\lstname % show the filename of files included with \lstinputlisting; also try caption instead of title
}
\begin{document}
\begin{lstlisting}
#include <stdio.h>
int main() {
print "hello world\n";
}
\end{lstlisting}
\end{document}
Observe também que mygreene mymauvetambém são muito escuros, pois também são idênticos aos
\definecolor{mygreen}{RGB}{0,153,0}
\definecolor{mymauve}{RGB}{148,0,209}
mas em outra escala.