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+%D \module
+%D [ file=t-graysquare,
+%D version=2007.07.17,
+%D title=\CONTEXT\ Style File,
+%D subtitle=Presentation Module graysquare,
+%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{graysquare} style for the presentation
+%D module. It is loaded at runtime. This minimalistic design is inspired by a
+%D presentation Taco gave at EuroTeX 2006.
+
+\writestatus{loading}{module graysquare}
+
+\startmodule[graysquare]
+
+\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 [a] [r=.95,g=.95,b=.95]
+\definecolor [b] [r=.7,g=.1,b=.3]
+\definecolor [c] [s=.3]
+\definecolor [Item] [r=.7,g=.1,b=.3]
+
+%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=0cm,
+ height=fit,
+ margindistance=0cm,
+ header=0cm,
+ footer=0cm,
+ topspace=2cm,
+ backspace=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=15mm]
+
+\define[1]\Slidetitle{\page\setlayer[slidetitle]%
+ {\framed[framecolor=red,frame=off,width=\textwidth,height=3cm,offset=0pt,top=\vss,bottom=\vss,align=left]{\switchtobodyfont[\Titlesize]\color[b]{#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[b]{\getvariable{taspresent}{title}}}
+\blank[2*line]
+\midaligned{\color[b]{\getvariable{taspresent}{author}}}
+\blank[3*line]
+\midaligned{\color[b]{\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{bottom}
+StartPage ;
+fill Page withcolor \MPcolor{a} ;
+z.b1 = llcorner Field[Text][Text] ;
+z.b2 = lrcorner Field[Text][Text] ;
+path wdt ;
+wdt = z.b1 -- z.b2 ;
+numeric diff; diff = .3cm ;
+numeric arc; arc = arclength (wdt) - diff ;
+numeric pages; pages = NOfPages - 1 ;
+numeric factor; factor = arc/pages ;
+path m[] ;
+m[0] = unitsquare xyscaled (diff,diff) shifted (x.b1,0.85cm) ;
+fill m[0] withcolor \MPcolor{c} ;
+if PageNumber = 1:
+ fill m[0] xyscaled (0,2) shifted (0,-diff-.85cm) withcolor \MPcolor{b} ;
+fi ;
+for i = 1 upto pages:
+ m[i] = m[0] shifted (i*factor,0) ;
+ fill m[i] withcolor \MPcolor{c} ;
+ if i+1 = PageNumber:
+% fill m[i] withcolor \MPcolor{b} ;
+ fill m[i] xyscaled (0,2) shifted (0,-diff-.85cm) withcolor \MPcolor{b} ;
+ fi ;
+endfor ;
+StopPage ;
+\stopuseMPgraphic
+
+%D We define these backgrounds as overlays:
+
+\defineoverlay
+[lecbackground]
+[\useMPgraphic{bottom}]
+
+%D These are shortcuts to switch backgrounds:
+
+\define\lecback{\setuplayout[header=1cm]\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][\useMPgraphic{ItSquare}]
+\setupitemize[1][color=b]
+
+\protect
+\stopmodule
+
+\endinput
+