\documentclass[dvipsnames,14pt,t,xelatex]{beamer}
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\usepackage{../graphics}
\usepackage{../langs}
%\usepackage{../data}

\hfuzz=220pt 

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\lstset{language=Scala,
        style=mystyle,
        numbersep=0pt,
        numbers=none,
        xleftmargin=0mm}

\newcommand{\bl}[1]{\textcolor{blue}{#1}}     

% beamer stuff 
\renewcommand{\slidecaption}{PEP (Scala) 01, King's College London}


\begin{document}

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\begin{frame}[t]
\frametitle{%
  \begin{tabular}{@ {}c@ {}}
  \\[5mm]
  \huge PEP Scala (1) 
  \end{tabular}}

  \normalsize
  \begin{center}
  \begin{tabular}{ll}
  Email:  & christian.urban at kcl.ac.uk\\
  Office: & S1.27 (1st floor Strand Building)\\
  Slides \& Code: & KEATS
  \end{tabular}
  \end{center}


\end{frame}
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\begin{frame}[c]
\frametitle{Why Scala?}

\begin{textblock}{6}(3,4)
\begin{tabular}{l}
\mbox{}\hspace{-1mm}\includegraphics[scale=0.36]{../pics/twitter.png}\\[-1mm]
\includegraphics[scale=0.30]{../pics/linked.png}\\
\includegraphics[scale=0.30]{../pics/guardian.jpg}\\[-3mm]
\mbox{}\hspace{-2mm}\includegraphics[scale=0.38]{../pics/morgan.png}\\[-3mm]
\includegraphics[scale=0.30]{../pics/suisse.png}\\
{\large\bf ...}
\end{tabular}
\end{textblock}

\begin{textblock}{6}(9,4)
\begin{tabular}{l}
\includegraphics[scale=0.20]{../pics/edf.png}\\[-1mm]
\includegraphics[scale=0.08]{../pics/novell.png}\\[-1mm]
\includegraphics[scale=0.30]{../pics/foursquare.png}\\
\includegraphics[scale=0.30]{../pics/hsbc.png}\\
{\large\bf ...}
\end{tabular}
\end{textblock}

\end{frame}
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\begin{frame}[c]
\frametitle{Why Scala?}

\begin{itemize}
\item compiles to the JVM\\
  \textcolor{gray}{(also JavaScript, native X86 in the works)}\medskip
\item integrates seamlessly with Java\medskip
\item combines \underline{\bf functional} and {\bf object-oriented} programming\bigskip
\item it is a bit on the ``mathematical'' side\\
  \textcolor{gray}{(no pointers, no \texttt{null})}
  
\item often one can write very concise and elegant code
\end{itemize}\bigskip\medskip  

\small
alternatives: Elm, Haskell, Ocaml, ML, Lisp (Racket), \ldots

\end{frame}
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\begin{frame}[c]
\frametitle{Java vs Scala}

{\lstset{language=java}\fontsize{12}{12}\selectfont
\texttt{\lstinputlisting{Point.java}}}

\rule{11cm}{0.3mm}\\[-2mm]

{\lstset{language=scala}\fontsize{12}{12}\selectfont
\texttt{\lstinputlisting{Point.scala}}}

\begin{textblock}{6}(13,3)
\textbf{\large Java}
\end{textblock}



\begin{textblock}{6}(13,13.4)
\textbf{\large Scala}
\end{textblock}  

\end{frame}
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\begin{frame}[c]
\frametitle{Scala Tools}

\begin{itemize}
\item there is a plugin for Eclipse (called Scala IDE)\medskip
\item there is also a plugin for IntelliJ\bigskip
\item I use the venerable Emacs ;o)
\end{itemize}  

\end{frame}
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\begin{frame}[c]
\frametitle{Types}

\begin{itemize}
\item Base types\smallskip

  \begin{tabular}{@{}l@{}}
    \textcolor{codegreen}{\texttt{Int}},
    \textcolor{codegreen}{\texttt{Long}},
    \textcolor{codegreen}{\texttt{BigInt}},
    \textcolor{codegreen}{\texttt{Float}},
    \textcolor{codegreen}{\texttt{Double}}\\
    \textcolor{codegreen}{\texttt{String}},
    \textcolor{codegreen}{\texttt{Char}}\\
    \textcolor{codegreen}{\texttt{Boolean}}
  \end{tabular}

\item Compound types \smallskip   

  \begin{tabular}{@{}ll@{}}
    \textcolor{codegreen}{\texttt{List[Int]}}     & lists of Int's \\
    \textcolor{codegreen}{\texttt{Set[Double]}}   & sets of Double's \\
    \textcolor{codegreen}{\texttt{(Int, String)}} & Int-String pair\\
    \textcolor{codegreen}{\texttt{List[(BigInt, String)]}} &
                                      lists of BigInt-String\\
                                      & pairs\\
    \textcolor{codegreen}{\texttt{List[List[Int]]}} & list of lists of Int's\\                                  
  \end{tabular}

\end{itemize}  

\end{frame}
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\begin{frame}[c]
\frametitle{An Http Request}
  
\begin{textblock}{1}(2,5)
\begin{tabular}{c}
\includegraphics[scale=0.15]{../pics/servers.png}\\[-2mm]
\small Server
\end{tabular}
\end{textblock}

\begin{textblock}{1}(5.6,4)
  \begin{tikzpicture}[scale=1.1]
  \draw[white] (0,1) node (X) {};
  \draw[white] (2,1) node (Y) {};
   \draw[white] (0,0) node (X1) {};
  \draw[white] (2,0) node (Y1) {};
   \draw[white] (0,-1) node (X2) {};
  \draw[white] (2,-1) node (Y2) {};
  \draw[red, <-, line width = 2mm] (X) -- (Y);
  \node [inner sep=5pt,label=above:\textcolor{black}{GET request}] at ($ (X)!.5!(Y) $) {};
  \draw[red, ->, line width = 2mm] (X1) -- (Y1);
  \node [inner sep=5pt,label=above:\textcolor{black}{webpage}] at ($ (X1)!.5!(Y1) $) {};
  \draw[red, <-, line width = 2mm] (X2) -- (Y2);
  \node [inner sep=7pt,label=above:\textcolor{black}{POST data}] at ($ (X2)!.5!(Y2) $) {};
  \end{tikzpicture}
\end{textblock}


\begin{textblock}{1}(9,5.5)
\begin{tabular}{c}
\includegraphics[scale=0.15]{../pics/laptop.png}\\[-2mm]
\small Browser
\end{tabular}
\end{textblock}
\end{frame}
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\begin{frame}[c]

{\lstset{language=Java}\fontsize{7}{8}\selectfont
\texttt{\lstinputlisting{URLReader.java}}}

\only<2>{
\begin{textblock}{5}(12,2)
\includegraphics[scale=0.50]{../pics/skeleton.jpg}\\
\end{textblock}}
\end{frame}
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\begin{frame}[c]
\frametitle{Conclusion}

\begin{itemize}
\item Scala is still under heavy development\\ (the compiler is terribly slow)\medskip
\item {\bf\url{http://www.scala-lang.org/}}\bigskip
\item it is a rather \textbf{\alert{deep}} language\ldots i.e.~gives you a lot of
  rope to shoot yourself\bigskip\bigskip 

\item hope you have fun with the coursework  
\end{itemize}
\end{frame}
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\begin{frame}[c]
\frametitle{\begin{tabular}{c}\\[3cm]\alert{Questions?}\end{tabular}}

\mbox{}
\end{frame}
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\end{document}


\end{document}

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