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\usepackage{listings}

\lstset{language=Python,

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\newcommand{\tvtk}{\texttt{tvtk}}

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\title[]{3D data Vizualization\\ \& \\Test Driven Approach}

\author[FOSSEE Team] {Asokan Pichai\\Prabhu Ramachandran}

\institute[FOSSEE] {FOSSEE Team}

\date[] {11, October 2009}

\date[] % (optional)

}

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      \Large

    \tableofcontents[currentsection,currentsubsection]

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\begin{document}

\begin{frame}

  \maketitle

\end{frame}

\begin{frame}

  \frametitle{Outline}

  \Large

  \tableofcontents

  % You might wish to add the option [pausesections]

\end{frame}

\section{3D Data Visualization}

\begin{frame}

    \frametitle{What is visualization?}

    \Large

    \begin{center}

    Visual representation of data

    \end{center}

\end{frame}

\begin{frame}

    \frametitle{3D visualization}

    \Large

    \begin{center}

        Harder but important

    \end{center}

\end{frame}

\begin{frame}

    \frametitle{Is this Graphics?}

    \Large

    \begin{center}

        Visualization is about data!

    \end{center}

\end{frame}

\begin{frame}

    \frametitle{Examples: trajectory in space}

    \Large

    \begin{center}

        \pgfimage[width=2.5in]{MEDIA/m2/mlab/plot3d_ex}

    \end{center}

\end{frame}

\begin{frame}

    \frametitle{Examples: Fire in a room}

    \Large

    \begin{center}

        Demo of data

    \end{center}

\inctime{10}

\end{frame}

\section{Tools at your disposal:}

\subsection{mlab}

    {Overview}

    \Large

    \begin{itemize}

        \item Simple

        \item Convenient

        \item Full-featured

    \end{itemize}

\end{frame}

\begin{frame}[fragile]

    \frametitle{Getting started}

    \myemph{\Large Vanilla:}

    \begin{lstlisting}[language=bash]

        $ ipython -wthread

    \end{lstlisting}

    \myemph{\Large with Pylab:}

    \begin{lstlisting}[language=bash]

        $ ipython -pylab -wthread

    \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

    \frametitle{Using mlab:}

    \begin{lstlisting}

>>> from enthought.mayavi import mlab

    \end{lstlisting}

    \vspace*{0.5in}

    \myemph{\Large Try these:}

    \vspace*{0.25in}

    \begin{lstlisting}

>>> mlab.test_<TAB>

>>> mlab.test_contour3d()

>>> mlab.test_contour3d??

    \end{lstlisting}

\end{frame}

    {Exploring the view}

    \begin{columns}

        \column{0.6\textwidth}

    \pgfimage[width=3in]{MEDIA/m2/contour3d}

        \column{0.4\textwidth}

        \begin{itemize}

            \item Mouse

            \item Keyboard

            \item Toolbar

            \item Mayavi icon(wait for it...) \pgfimage[width=0.2in]{MEDIA/m2/m2_icon}

        \end{itemize}

    \end{columns}

\end{frame}

\begin{frame}[fragile]

    \frametitle{\mlab\ plotting functions}

    \begin{columns}

        \column{0.25\textwidth}

        \myemph{\Large 0D data}

        \column{0.5\textwidth}

    \pgfimage[width=2in]{MEDIA/m2/mlab/points3d_ex}

    \end{columns}

    \begin{lstlisting}

>>> from numpy import *

>>> t = linspace(0, 2*pi, 50)

>>> u = cos(t)*pi

>>> x, y, z = sin(u), cos(u), sin(t)

    \end{lstlisting}

    \emphbar{\PythonCode{>>> mlab.points3d(x, y, z)}}

\end{frame}

\begin{frame}

  \begin{columns}

        \column{0.25\textwidth}

        \myemph{\Large 1D data}

        \column{0.5\textwidth}

        \pgfimage[width=2.5in]{MEDIA/m2/mlab/plot3d_ex}

  \end{columns}

  \emphbar{\PythonCode{>>> mlab.plot3d(x, y, z, t)}}

    Plots lines between the points

\end{frame}

\begin{frame}[fragile]

    \begin{columns}

        \column{0.25\textwidth}

        \myemph{\Large 2D data}

        \column{0.5\textwidth}

        \pgfimage[width=2in]{MEDIA/m2/mlab/surf_ex}

    \end{columns}            

    \begin{lstlisting}

>>> x = mgrid[-3:3:100j,-3:3:100j]

>>> z = sin(x*x + y*y)

    \end{lstlisting}

    \emphbar{\PythonCode{>>> mlab.surf(x, y, z)}}

    \alert{Assumes the points are rectilinear}

\end{frame}

\begin{frame}[fragile]

    \myemph{\Large 2D data: \texttt{mlab.mesh}}

    \vspace*{0.25in}

    \emphbar{\PythonCode{>>> mlab.mesh(x, y, z)}}

    \alert{Points needn't be regular}

    \vspace*{0.25in}

\begin{lstlisting}

>>> phi, theta = numpy.mgrid[0:pi:20j, 

...                         0:2*pi:20j]

>>> x = sin(phi)*cos(theta)

>>> y = sin(phi)*sin(theta)

>>> z = cos(phi)

>>> mlab.mesh(x, y, z, 

...           representation='wireframe')

\end{lstlisting}

\end{frame}

\begin{frame}[fragile]

  \begin{columns}

        \column{0.25\textwidth}

        \myemph{\Large 3D data}

        \column{0.5\textwidth}

        \pgfimage[width=1.5in]{MEDIA/m2/mlab/contour3d}\\        

    \end{columns}

\begin{lstlisting}

>>> x, y, z = ogrid[-5:5:64j, 

...                -5:5:64j, 

...                -5:5:64j]

>>> mlab.contour3d(x*x*0.5 + y*y + 

                   z*z*2)

\end{lstlisting}

\end{frame}

\begin{frame}[fragile]

    \myemph{\Large 3D vector data: \PythonCode{mlab.quiver3d}}

    \vspace*{0.25in}

    \pgfimage[width=2in]{MEDIA/m2/mlab/quiver3d_ex}\\

\begin{lstlisting}

>>> mlab.test_quiver3d()

\end{lstlisting}

\emphbar{\PythonCode{obj = mlab.quiver3d(x, y, z, u, v, w)}}

\inctime{20}

\end{frame}

\subsection{Mayavi2.0}

  \frametitle{Introduction to Mayavi}

  \begin{itemize}

  \item Most scientists not interested in details of visualization

  \item Visualization of data files with a nice UI

  \item Interactive visualization of data (think Matlab)

  \item Embedding visualizations in applications

  \item Customization

  \end{itemize}

  \pause

  \begin{block}{The Goal}

      Provide a \alert{flexible} library/app for every one of these needs!

  \end{block}

\end{frame}

    {Overview of features}

      \vspace*{-0.3in}

  \begin{center}    

    \hspace*{-0.2in}\pgfimage[width=5in]{MEDIA/m2/m2_app3_3}

  \end{center}    

\end{frame}

    \frametitle{Mayavi in applications}

      \vspace*{-0.3in}

  \begin{center}    

    \hspace*{0.2in}\pgfimage[width=4.5in]{MEDIA/m2/m2_envisage}

  \end{center}

\end{frame}

\begin{frame}

    {Exploring the documentation}

    \begin{center}

    \pgfimage[width=4.5in]{MEDIA/m2/m2_ug_doc}

    \end{center}

\end{frame}

\begin{frame}

  \frametitle{Summary}

      \begin{itemize}

          \item \url{http://code.enthought.com/projects/mayavi}

          \item Uses VTK (\url{www.vtk.org})

          \item BSD license

          \item Linux, win32 and Mac OS X

          \item Highly scriptable

          \item Embed in Traits UIs (wxPython and PyQt4)

          \item Envisage Plugins

          \item Debian/Ubuntu/Fedora

          \item \alert{Pythonic}

      \end{itemize}

      \inctime{10}

\end{frame}

\begin{frame}

    {Getting hands dirty!}

        \begin{block}{Motivational problem}

        Atmospheric data of temperature over the surface of the earth.

        Let temperature ($T$) vary linearly with height ($z$):

        \begin{center}            

        $T = 288.15 - 6.5z$

        \end{center}

        \end{block}

\end{frame}

\begin{frame}[fragile]

    \frametitle{Simple solution}

    \begin{lstlisting}

lat = linspace(-89, 89, 37)

lon = linspace(0, 360, 37)

z = linspace(0, 100, 11)

    \end{lstlisting}

\pause

    \begin{lstlisting}

x, y, z = mgrid[0:360:37j,-89:89:37j,

                0:100:11j]

t = 288.15 - 6.5*z

mlab.contour3d(x, y, z, t)

mlab.outline()

mlab.colorbar()

    \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

    \frametitle{Exercise: Lorenz equation}

    \begin{columns}

        \column{0.25\textwidth}

        \begin{eqnarray*}

        \frac{d x}{dt} &=& s (y-x)\\

        \frac{d y}{d t} &=& rx -y -xz\\

        \frac{d z}{d t} &=& xy - bz\\

        \end{eqnarray*}

        \column{0.25\textwidth}

        Let $s=10,$

        $r=28,$ 

        $b=8./3.$

    \end{columns}

    \structure{\Large Region of interest}

  \begin{lstlisting}

x, y, z = mgrid[-50:50:20j,-50:50:20j,

                -10:60:20j]

  \end{lstlisting}

\inctime{20}

\end{frame}

\section{Test Driven Approach}

    \frametitle{Testing code with \typ{nosetests}}

    \begin{itemize}

        \item Writing tests is really simple!

        \item Using nose

        \item Example!

    \end{itemize}

\end{frame}

\begin{frame}[fragile]

    \frametitle{Nosetest}

def gcd(a, b):

    """Returns gcd of a and b, 

     handles only positive numbers."""

    if a%b == 0: return b

    return gcd(b, a%b)

def lcm(a, b):

    return a*b/gcd(a, b)

if __name__ == '__main__':

    import nose

    nose.main()