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+%D \module
+%D [ file=t-narrowstripe,
+%D version=2007.07.25,
+%D title=\CONTEXT\ Style File,
+%D subtitle=Presentation Module narrowstripe,
+%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{narrowstripe} style for the presentation
+%D module. It is loaded at runtime. The theme for this style is inspired by the
+%D \quotation{Berkeley} theme of the \LaTeX\ Beamer package.
+
+\writestatus{loading}{module narrowstripe}
+
+\startmodule[narrowstripe]
+
+\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 start colors:
+
+\setupcolors[state=start]
+
+%D The narrowframe module has parameters of its own; we set them up and use
+%D them:
+
+\setupmodule[color=blue]
+
+\processaction[\currentmoduleparameter{color}]
+ [ red=>\def\colormode{redmode},
+ blue=>\def\colormode{bluemode},
+ green=>\def\colormode{greenmode},
+ \v!unknown=>\def\colormode{bluemode},
+ \v!default=>\def\colormode{bluemode}]
+
+\enablemode[\colormode]
+
+%D These macros are used for placing figures/pictures:
+
+\define\NormalHeight{\textheight}
+\define\NormalWidth{.476\textwidth}
+\define\PictureFrameHeight{\textheight}
+\define\PictureFrameWidth{.476\textwidth}
+
+%D The page layout:
+
+\setuplayout [width=fit,
+ leftmargin=1.5cm,
+ rightmargin=0cm,
+ leftmargindistance=1.8cm,
+ rightmargindistance=0pt,
+ height=fit,
+ header=2.5cm,
+ footer=0cm,
+ topspace=.4cm,
+ backspace=3.2cm,
+ cutspace=3.7cm,
+ bottomspace=0cm,
+ bottom=0pt,
+ 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=32mm]
+
+\define[1]\Slidetitle{\page\setlayer[slidetitle]%
+ {\framed[framecolor=red,frame=off,width=\textwidth,height=2.25cm,offset=0pt,align=middle,top=\vss,bottom=\vss]{\switchtobodyfont[\Titlesize]\color[d]{#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[d]{\getvariable{taspresent}{title}}}
+\blank[2*line]
+\midaligned{\color[d]{\getvariable{taspresent}{author}}}
+\blank[3*line]
+\midaligned{\color[d]{\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 define our colors, depending on the mode:
+
+\startmode[bluemode]
+\definecolor [Item] [b=.8]
+\definecolor [a] [s=.95]
+\definecolor [b] [r=0,g=0,b=1]
+\definecolor [c] [r=.69,g=.69,b=.97]
+\definecolor [d] [b=.8]
+\stopmode
+
+\startmode[redmode]
+\definecolor [Item] [r=.8]
+\definecolor [a] [s=.95]
+\definecolor [b] [r=1]
+\definecolor [c] [b=.69,g=.69,r=.97]
+\definecolor [d] [r=.8]
+\stopmode
+
+\startmode[greenmode]
+\definecolor [Item] [g=.4]
+\definecolor [a] [s=.95]
+\definecolor [b] [g=.4]
+\definecolor [c] [b=.68,r=.68,g=.79]
+\definecolor [d] [g=.4]
+\stopmode
+
+%D We let Metapost calculate the background:
+
+\startuseMPgraphic{narrow}
+StartPage ;
+numeric a ;
+numeric b ;
+numeric c ;
+c = PaperHeight - a/2 ;
+pair za[] ;
+path p[] ;
+a = 2.25cm ;
+b = 0.4 cm ;
+za1 = ulcorner Page shifted (0,-a) ;
+za2 = ulcorner Page shifted (0,-a-b) ;
+za3 = urcorner Page shifted (0,-a-b) ;
+za4 = urcorner Page shifted (0,-a) ;
+za5 = ulcorner Page shifted (a,0) ;
+za6 = ulcorner Page shifted (a+b,0) ;
+za7 = llcorner Page shifted (a+b,0) ;
+za8 = llcorner Page shifted (a,0) ;
+za9 = ulcorner Page shifted (a,-a) ;
+za10 = ulcorner Page shifted (a+b,-a) ;
+za11 = ulcorner Page shifted (a+b,-a-b) ;
+za12 = ulcorner Page shifted (a,-a-b) ;
+p[1] = za1 -- za2 -- za3 -- za4 -- cycle ;
+p[2] = za5 -- za6 -- za7 -- za8 -- cycle ;
+p[3] = za9 -- za10 --za11 -- za12 -- cycle ;
+linear_shade(p[1],1,\MPcolor{a},\MPcolor{b}) ;
+linear_shade(p[2],2,\MPcolor{b},\MPcolor{a}) ;
+fill p[3] withcolor \MPcolor{c} ;
+draw \sometxt{\framed[frame=off,width=2.25cm,height=2.25cm]{\color[d]{\tfx \folio}}} shifted (0,PaperHeight-a) ;
+StopPage ;
+\stopuseMPgraphic
+
+%D We define these backgrounds as overlays:
+
+\defineoverlay
+[lecbackground]
+[\useMPgraphic{narrow}]
+
+%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=1.1cm]
+
+%D These are shortcuts to switch backgrounds:
+
+\define\lecback{\setupbackgrounds[page][background={lecbackground,slidetitle}]}
+\define\titback{\setupbackgrounds[page][background=lecbackground]}
+\define\picback{\setupbackgrounds[page][background={lecbackground,slidetitle}]}
+\define\noback{\setupbackgrounds[page][background=nobackground]}
+
+\setupbackgrounds[page][background=lecbackground]
+
+%D The symbol for the first level of itemizations.
+
+\definesymbol[1][\useMPgraphic{ItSquare}]
+\setupitemize[1][inmargin][color=d]
+
+\protect
+\stopmodule
+
+\endinput
+