horizontal alignmentlistings
I am trying to center a listing horizontally within a page.
So far I have tried defining the following macro:
\lstnewenvironment{snippet}[1][]
{\centering \lstset{float=htpb,#1}}
{}
But it did not work.
I have read this question and answer, but I would prefer a solution that does not rely in figures or tables.
There's indeed something in the example code of the tocloft package that's not quite correct about how to get the string "Contents" centered on a line. Anyway, you can achieve your objective by issuing the commands
\renewcommand{\contentsname}{\hfill\bfseries\Large Contents\hfill}
\renewcommand{\cftaftertoctitle}{\hfill}
Note the \hfill inserted after "Contents". If you would rather have the string "Contents" be set in normal size and normal weight, you'd use \normalfont\normalsize instead of \bfseries\Large.
A full MWE, applying these changes to the header of the List of Tables as well:
\documentclass{article}
\usepackage{tocloft}
\renewcommand{\contentsname}{\hfill\bfseries\Large Contents\hfill}
\renewcommand{\cftaftertoctitle}{\hfill}
\renewcommand{\listtablename}{\hfill\bfseries\Large List of Tables} % no \hfill after "List of Tables"...
%%% using the command "\renewcommand{\cftlottitlefont}{\hfill\bfseries\Large}" works too...
\renewcommand{\cftafterlottitle}{\hfill}
\begin{document}
\tableofcontents
\listoftables
\section{Section}
\begin{table}[h]
\centering
\begin{tabular}{| l | c | r |}
\hline
1 & 2 & 3 \\
\hline
\end{tabular}
\caption[Example table]{This is a table.}
\end{table}
\end{document}
As your minipages are bigger than half of the page, they will need some more place on both sides of the text. Just put every two minipages in a \makebox for this. (Not my recommendation. Try to fit everything in your margins as this will look more consistent over your whole report.)
For vertical centring, just use the [p] specifier of your figure. If you use [t] instead or none at all, it will be flushed to the top if followed by text. No need for \vspace.
Load caption in order to get better spacing between captions and following images.
% arara: pdflatex
\documentclass{article}
\usepackage[demo]{graphicx}
%\usepackage{changepage} % not needed any more
\usepackage{showframe} % just for demo
\usepackage{caption}
\begin{document}
\begin{figure}[p]
\makebox[\textwidth][c]{%
\begin{minipage}[b]{0.565\linewidth}
\centering
\includegraphics[scale=0.7]{plots/Reflex_128_Plot_xRemovals_yCPUsecondsEncoding.eps}
\caption{Reflex: $128 \times 128$ - Encoder}
\label{plot:encoding_decoding_cpu_time_2a}
\end{minipage}%
\begin{minipage}[b]{0.565\linewidth}
\centering
\includegraphics[scale=0.7]{plots/Reflex_128_Plot_xRemovals_yCPUsecondsDecoding.eps}
\caption{Reflex: $128 \times 128$ - Decoder}
\label{plot:encoding_decoding_cpu_time_2b}
\end{minipage}}%
\makebox[\textwidth][c]{%
\begin{minipage}[b]{0.565\linewidth}
\centering
\includegraphics[scale=0.7]{plots/Lena_128_Plot_xRemovals_yCPUsecondsEncoding.eps}
\caption{Lena: $128 \times 128$ - Encoder}
\label{plot:encoding_decoding_cpu_time_3a}
\end{minipage}%
\begin{minipage}[b]{0.565\linewidth}
\centering
\includegraphics[scale=0.7]{plots/Lena_128_Plot_xRemovals_yCPUsecondsDecoding.eps}
\caption{Lena: $128 \times 128$ - Decoder}
\label{plot:encoding_decoding_cpu_time_3b}
\end{minipage}}%
\makebox[\textwidth][c]{%
\begin{minipage}[b]{0.565\linewidth}
\centering
\includegraphics[scale=0.7]{plots/Fruits_128_Plot_xRemovals_yCPUsecondsEncoding.eps}
\caption{Fruits: $128 \times 128$ - Encoder}
\label{plot:encoding_decoding_cpu_time_4a}
\end{minipage}%
\begin{minipage}[b]{0.565\linewidth}
\includegraphics[scale=0.7]{plots/Fruits_128_Plot_xRemovals_yCPUsecondsDecoding.eps}
\centering
\caption{Fruits: $128 \times 128$ - Decoder}
\label{plot:encoding_decoding_cpu_time_4b}
\end{minipage}}%
\end{figure}
\end{document}
Best Answer
only possible when you define a width for a minipage: