graphicshorizontal alignmentlandscapevertical alignment
I've used the \usepackage{pdflscape} instruction and the following code for inserting an image in a landscape oriented page.
\begin{landscape}
\begin{figure}[p!]
\centering
\includegraphics[scale=0.4]{./images/SelectDVA.png}
\caption{DVA selection Use Case.}
\end{figure}
\end{landscape}
This is the outcome:
I'd like the image to be centred vertically and horizontally, put playing with \vspace or \hspace didn't help me.
What is the correct way of doing it?
You have to carefully adjust the dimensions of your image and the number of lines the wrap figure will extend ( for example [10] in \begin{wrapfigure}[10]{r}{5.5cm}).
An example:
\documentclass{article}
\usepackage{graphicx,wrapfig,lipsum}
%------------------------------------------
\begin{document}
This is where the table goes with text wrapping around it. You may
embed tabular environment inside wraptable environment and customize as you like.
%------------------------------------------
\begin{wrapfigure}[10]{r}{5.5cm}
\rule{5.5cm}{7.1cm}
\caption{A wrapped figure}\label{wrap-fig:1}
\end{wrapfigure}
%------------------------------------------
This is where the table goes with text wrapping around it. You may
embed tabular environment inside wraptable environment and customize as you like. This is where the table goes with text wrapping around it. You may
embed tabular environment inside wraptable environment and customize as you like. This is where the table goes with text wrapping around it.
%
\begin{figure}[h]
\begin{minipage}{6cm}
\centering
\rule{\textwidth}{3cm}
\caption{my figure}\label{fig:2}
\end{minipage}%
\end{figure}%
\lipsum[2-3]
Figure~\ref{wrap-fig:1} is a wrapped figure.
%------------------------------------------
\end{document}
This solution may be very specific to your case and not applicable to the general question title. More on the topic can be found in this question.
As everything except the image should stay the same as in the normal portrait mode, you should probably just rotate the image and rotate the page only with a pdf attribute instead of using pdflandscape. I had to get rid of the float environment to control the pagebrakes and pdf attributes on the very page of the image. The capt-of package emulates the figure environment for creating the appropriate caption type.
\documentclass[12pt,a4paper,fleqn,parskip=half]{scrartcl}
\usepackage{graphicx}
\usepackage{showframe} %% just to show frames.
\usepackage{capt-of}
\newenvironment{rotatepage}%
{\pagebreak\global\pdfpageattr\expandafter{\the\pdfpageattr/Rotate 90}}%
{\pagebreak\global\pdfpageattr\expandafter{\the\pdfpageattr/Rotate 0}}%
\begin{document}
blindtext
\begin{rotatepage}
\vspace*{\fill} % this and the the vspace below will center the image vertically
\centering % this will center the image horizontally
\includegraphics[scale=1.2,angle=90]{example-image-a}
\captionof{figure}{A very very very very very very very very very very very very
very very very very very very very very very very very very very very long caption.}
\label{a}
\vspace{\fill}
\end{rotatepage}
blindtext
\end{document}
Result:
Best Answer
From your picture it seems that the image scaled at 40% is still too wide for the page, so an overfull box is produced (and the excess goes to the right, which is the top of the rotated page).
While adding something like
\hspace*{-1cm}(tune the length to your needs) would somewhat cure the problem, the caption would not be centered to the image any more.Probably you should better do
or
to give some more room. Unfortunately, it seems that the real textwidth is not available when using
pdflscape(the fault is inlscapefrom which the former depends), so\hsizeshould be used.