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%D \module
%D   [      file=t-quadblue,
%D        version=2007.07.17, 
%D          title=\CONTEXT\ Style File,
%D       subtitle=Presentation Module quadblue,
%D         author=Thomas A. Schmitz,
%D           date=\currentdate,
%D      copyright={Thomas A. Schmitz}]
%C
%C Copyright 2007 Thomas A. Schmitz.
%C This file may be distributed under the GNU General Public License v. 2.0.

%D This file provides the \quotation{quadblue} style for the presentation
%D module. It is loaded at runtime. 

\writestatus{loading}{module quadblue}

\startmodule[quadblue]

\unprotect

%D The taspresentation module provides a skeleton into which different styles
%D can be hooked. It uses a number of variables and macros which have to be set
%D beforehand. Some parts are optional. We begin with the necessary definitions:

%D We define our colors:

\definecolor[outer][r=0,g=0,b=.92]
\definecolor[current][r=0,g=0,b=.4]
\definecolor[inner][s=.98]

%D We start colors:

\setupcolors[state=start]

%D These macros are used for placing figures/pictures:

\define\NormalHeight{\textheight}
\define\NormalWidth{.5\textwidth}
\define\PictureFrameHeight{\textheight}
\define\PictureFrameWidth{.5\textwidth}

%D The page layout:

\setuplayout [width=fit,
	      height=middle,
              margin=1.5cm,
              height=fit,
	      leftmargindistance=.4cm,
	      rightmargindistance=0cm,
              header=1.5cm, 
              footer=0cm, 
              topspace=1cm, 
              backspace=2.5cm,
	      cutspace=1.5cm,
              location=singlesided]

%D The macro for typesetting the Slidetitle; this is adapted from a sample
%D document that Brooks Moses published on the wiki:

\definelayer[slidetitle]
    [width=\paperwidth,
    height=\paperheight,
    x=25mm]

\define[1]\Slidetitle{\page\setlayer[slidetitle]%
     {\framed[frame=off,width=\textwidth,height=2.5cm,offset=0pt,top=\vss,bottom=\vss]{\switchtobodyfont[\Titlesize]\color[outer]{#1}}}}

%D The macro \tex{Maketitle} produces a default title page with the author, the
%D title of the presentation, and the date. Using it is not mandatory.

\define\Maketitle{%
\titback
\null
\vfill
\midaligned{\switchtobodyfont[\Titlesize]\color[outer]{\getvariable{taspresent}{title}}}
\blank[2*line]
\midaligned{\color[outer]{\getvariable{taspresent}{author}}}
\blank[3*line]
\midaligned{\color[outer]{\currentdate}}
\vfill
\null}

%D The following parts are optional; if you don't use backgrounds and are
%D content with CONTEXT's default itemization, you don't have to set these
%D macros. 

%D We let Metapost calculate the background:

\startuseMPgraphic{left} 
StartPage ;
fill Page withcolor \MPcolor{inner} ;
z1 = ulcorner Page ;
z5 = llcorner Page ;
path q ;
q = z1 -- z5 ;
t = arclength (q) ;
u = t/15 ;
v = (PageNumber/NOfPages) ;
z4 = (x1+1cm, y1-1cm) ;
z3 = (x4, y1) ;
z2 = (x1, y4) ;
path m[] ;
m[1] = z1 -- z2 -- z4 -- z3 -- cycle ;
m[2] = m[1] shifted (0, -2*u) ;
m[3] = m[1] shifted (0, -4*u) ;
m[4] = m[1] shifted (0, -6*u) ;
m[5] = m[1] shifted (0, -8*u) ;
m[6] = m[1] shifted (0, -10*u) ;
m[7] = m[1] shifted (0, -12*u) ;
m[8] = m[1] shifted (0, (-14*u-0.5mm)) ;
for i=1 upto 8:
	fill m[i] withcolor\MPcolor{outer} ;
endfor;
if PageNumber=1:
	fill m[1] withcolor \MPcolor{current} ;
elseif (v>.001) and (v<.167) :
	fill m[2] withcolor \MPcolor{current} ;	
elseif (v>.166) and (v<.334):
	fill m[3] withcolor \MPcolor{current} ;	
elseif (v>.333) and (v<.501):
	fill m[4] withcolor \MPcolor{current} ;	
elseif (v>.5) and (v<.667):
	fill m[5] withcolor \MPcolor{current} ;	
elseif (v>.666) and (v<.834):
	fill m[6] withcolor \MPcolor{current} ;	
elseif (v>.833) and (v<1):
	fill m[7] withcolor \MPcolor{current} ;	
elseif v=1:
	fill m[8] withcolor \MPcolor{current} ;
fi ;
StopPage ;

\stopuseMPgraphic 

%D We define these backgrounds as overlays:

\defineoverlay 
[lecbackground] 
[\useMPgraphic{left}] 

%D These are shortcuts to switch backgrounds:

\define\lecback{\setuplayout[header=1.5cm]\setupbackgrounds[page][background={lecbackground,slidetitle}]}
\define\titback{\setuplayout[header=0cm]\setupbackgrounds[page][background=lecbackground]}
\define\picback{\setuplayout[header=0cm]\setupbackgrounds[page][background={lecbackground,slidetitle}]}
\define\noback{\setupbackgrounds[page][background=nobackground]}

%D We use combinations for placing vertical pictures and text side by side, and
%D we want a distance of 1.1 cm between both.

\setupcombinations[distance=0cm]

%D The symbol for the first level of itemizations. 

\definesymbol[1][$\square$]
\setupitemize[1][inmargin][color=outer]

\protect
\stopmodule

\endinput