%==============================================================================
% Prosper -- (PPRntnu.sty) Style file
% A LaTeX class for creating slides
% Author: Trond Varslot (varslot@math.ntnu.no)
%         Institute of Mathematical Sciences
%         Norwegian University of Science and Technology, Norway         
%
% Copyright (c) 2002 Trond Varslot
% All rights reserved.
% 
% Permission is hereby granted, without written agreement and without
% license or royalty fees, to use, copy, modify, and distribute this
% software and its documentation for any purpose, provided that the
% above copyright notice and the following two paragraphs appear in
% all copies of this software.
% 
% IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, 
% SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF 
% THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE AUTHOR HAS BEEN ADVISED 
% OF THE POSSIBILITY OF SUCH DAMAGE.
% 
% THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES,
% INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
% AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
% ON AN "AS IS" BASIS, AND THE AUTHOR HAS NO OBLIGATION TO
% PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
%
%==============================================================================
\NeedsTeXFormat{LaTeX2e}[1995/12/01]
\ProvidesPackage{PPRwinter}[2002/12/01]
\typeout{Winter style for Prosper ---}
\typeout{(c) 2002 Trond Varslot}

% Required packages
\RequirePackage{pst-grad}
\RequirePackage{amssymb}

%Define snow flakes
\newcommand{\flakepart}{%
\pspolygon(0,0)(0.5,1)(0.5,3)(1.9,4.4)(1.2,5.1)(0.5,4.4)(0.5,5.7)(-0.5,5.7)(-0.5,4.4)(-1.2,5.1)(-1.9,4.4)(-0.5,3)(-0.5,1)}
\newcommand{\snowflake}[1]{%
\psset{unit=#1}%
\multips{0}(0,0){1}{\flakepart}%
\multips{60}(0,0){1}{\flakepart}%
\multips{120}(0,0){1}{\flakepart}%
\multips{180}(0,0){1}{\flakepart}%
\multips{240}(0,0){1}{\flakepart}%
\multips{300}(0,0){1}{\flakepart}%
}
\newcommand{\multiflake}{%
\rput(0.0 ,1.6){\snowflake{0.06}}%
\rput(0.2 ,0.0){\snowflake{0.06}}%
\rput(0.5 ,0.6){\snowflake{0.04}}%
\rput(0.1 ,1  ){\snowflake{0.04}}%
\rput(0.8 ,1.4){\snowflake{0.06}}%
}

% mywhite is used to avoid a bug in Acroread 5, which refuses to redraw the
% screen if it does not have a background. This increases the file size unnecessarily.
\newrgbcolor{mywhite}{0.99 0.99 0.99}

\ifcolorBG
  \global\let\colortitlefont=\white
\else
  \global\let\colortitlefont=\blue
\fi

% The fonts
\FontTitle{%
  \usefont{T1}{ptm}{b}{n}\fontsize{20.74pt}{20pt}\selectfont\colortitlefont}{%
  \usefont{T1}{ptm}{b}{n}\fontsize{20.74pt}{20pt}\selectfont\black}
\FontSubtitle{%
  \usefont{T1}{ptm}{b}{n}\fontsize{16pt}{16pt}\selectfont\itshape\blue}{%
  \usefont{T1}{ptm}{b}{n}\fontsize{16pt}{16pt}\selectfont\itshape\black}

\FontText{%
  \usefont{T1}{ptm}{m}{n}\fontsize{14.4pt}{13pt}\selectfont\black}{%
  \usefont{T1}{ptm}{m}{n}\fontsize{14.4pt}{13pt}\selectfont\black}

%Make sure that footer is written with a T1 font:
\ifcolorBG
\ColorFoot{\usefont{T1}{ptm}{n}{n}\selectfont\lightgray}
\else
\ColorFoot{\usefont{T1}{ptm}{n}{n}\selectfont\gray}
\fi

%Make sure that email address is written with a T1 font:
\renewcommand{\ttdefault}{pcr}

% Positionning of the title of a slide.
\def\slidetitle#1{\rput[l](0,4.2){%
    \parbox{11.5cm}{%
      \begin{center}%
 	\fontTitle{\baselineskip=0pt #1}
      \end{center}
    }
  }
}

\LogoPosition{-1.5,-1.1}
\Logo{}

\newcommand{\WinterFrame}[1]{%
  \ifinColor
    \ifcolorBG
      \psset{linestyle=none,fillstyle=gradient,gradmidpoint=0}%
      \psframe[gradbegin=white,%
	gradend=blue]%
      (-1.9,-1.5)(\slideheight,\slidewidth)%
    \else
    % mywhite is used to avoid a bug in Acroread 5, which refuses to redraw the
    % screen if it does not have a background. This increases the file size unnecessarily.
      \psset{linestyle=none,fillstyle=solid}%
      \psframe[fillcolor=mywhite]%
      (-1.9,-1.5)(\slideheight,\slidewidth)%
    \fi
    \psset{linestyle=none,fillstyle=gradient,gradmidpoint=0}%
    \multips(-1.6,0.5)(10truemm,30truemm){3}{%
      \psframe[gradbegin=blue,
	gradend=white]
      (5truemm,180truemm)}
    \psset{fillcolor=white,fillstyle=solid,%
      linestyle=solid,linewidth=0.005,linecolor=lightgray}
  \else
  % mywhite is used to avoid a bug in Acroread 5, which refuses to redraw the
  % screen if it does not have a background. This increases the file size unnecessarily.
    \psset{linestyle=none,fillstyle=solid}%
    \psframe[fillcolor=mywhite]%
    (-1.9,-1.5)(\slideheight,\slidewidth)%
    \psset{linestyle=none,fillstyle=gradient,gradmidpoint=0}%
    \multips(-1.6,0.5)(10truemm,30truemm){3}{%
      \psframe[gradbegin=lightgray,
	gradend=white]
      (5truemm,180truemm)}
    \psset{fillcolor=white,fillstyle=solid,%
      linestyle=solid,linewidth=0.005,linecolor=lightgray}
  \fi
  \rput(-1.50,7){\multiflake}
  \rput(-1.35,5){\multiflake}
  \rput(-1.50,3){\multiflake}
  \PutLogo
      {#1}
}

% How lists will look:
\ifinColor
  \myitem{1}{\mathversion{bold}{\blue\ensuremath{\surd}}\mathversion{normal}}
  \myitem{2}{\mathversion{bold}{\blue\ensuremath{\star}}\mathversion{normal}}
  \myitem{3}{\mathversion{bold}{\scriptsize\blue\ensuremath{\rightarrow}}\mathversion{normal}}
\else
  \myitem{1}{\mathversion{bold}\ensuremath{\surd}\mathversion{normal}}
  \myitem{2}{\mathversion{bold}\ensuremath{\star}\mathversion{normal}}
  \myitem{3}{\mathversion{bold}{\scriptsize\ensuremath{\rightharpoonup}}\mathversion{normal}}
\fi


\NewSlideStyle{tl}{0,3.2}{WinterFrame}
\endinput