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-%D \module
-%D [ file=t-bluegray,
-%D version=2007.07.17,
-%D title=\CONTEXT\ Style File,
-%D subtitle=Presentation Module bluegray,
-%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{bluegray} style for the presentation
-%D module. It is loaded at runtime.
-
-\writestatus{loading}{module bluegray}
-
-\startmodule[bluegray]
-
-\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 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,
- margin=1.5cm,
- height=fit,
- header=11mm,
- footer=0cm,
- topspace=15mm,
- backspace=2cm,
- 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=20mm,
- y=12mm]
-
-\define[1]\Slidetitle{\page\setlayer[slidetitle]%
- {\framed[frame=off,height=1.5cm,width=\textwidth,offset=0pt,align=middle,top=\vss,bottom=\vss]{\switchtobodyfont[\Titlesize]#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]\getvariable{taspresent}{title}}
-\blank[2*line]
-\midaligned{\getvariable{taspresent}{author}}
-\blank[3*line]
-\midaligned{\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:
-
-\definecolor [a] [s=.88]
-\definecolor [Item] [s=0]
-\definecolor [One] [r=.5,g=0,b=.5]
-\definecolor [Two] [b=1]
-\definecolor [Three] [g=1,b=1]
-\definecolor [Four] [g=1]
-\definecolor [Five] [r=1,g=1]
-\definecolor [Six] [r=1]
-
-%D In a first attempt to avhieve the rainbow effect, I produced the rainbow
-%D background with asymptote and then converted it to a pdf file which was then
-%D used as a background. In that case, it was necessary to instruct \CONTEXT\
-%D to look in the default \TeX\ input paths for figures. The background spans
-%D the entire height of the page and the width of the text area; the gray
-%D background was then calculated so that the two stripes at the top and at the
-%D bottom were left unfilled so the rainbow background would then be visible.
-%D Here is the code:
-
-%\setupexternalfigures[location={global}]
-
-%\defineoverlay[rainb][{\externalfigure[rainbow.pdf][width=1.05\textwidth,height=1.4\textheight]}]
-
-% \startuniqueMPgraphic{gray}
-% StartPage ;
-% pair zf[] ;
-% path gr[] ;
-% numeric a; a = 2cm ;
-% numeric b; b = 0.8cm ;
-% z.f1 = ulcorner Page shifted (a,0) ;
-% z.f2 = urcorner Page shifted (-a,0) ;
-% z.f3 = lrcorner Page shifted (-a,0) ;
-% z.f4 = llcorner Page shifted (a,0) ;
-% z.f5 = z.f1 shifted (0,-b) ;
-% z.f6 = z.f2 shifted (0,-b) ;
-% z.f7 = z.f3 shifted (0,b) ;
-% z.f8 = z.f4 shifted (0,b) ;
-% z.f9 = z.f5 shifted (0,-b) ;
-% z.f10 = z.f6 shifted (0,-b) ;
-% z.f11 = z.f7 shifted (0,b) ;
-% z.f12 = z.f8 shifted (0,b) ;
-% gr[1] = ulcorner Page -- urcorner Page -- lrcorner Page -- llcorner Page -- z.f8 -- z.f7 -- z.f6 -- z.f5 -- z.f4 -- llcorner Page -- cycle ;
-% gr[2] = z.f9 -- z.f10 -- z.f11 -- z.f12 -- cycle ;
-% gr[2] := gr[2] enlarged (.5cm,0cm) ;
-% fill gr[1] withcolor \MPcolor{a} ;
-% fill gr[2] withcolor \MPcolor{a} ;
-% StopPage ;
-% \stopuniqueMPgraphic
-
-%D However, it seemed more portable to let Metapost calculate the background.
-%D The rainbow effect takes some lines of code, but it's not too bad:
-
-\startuniqueMPgraphic{gray}
-StartPage ;
-pair zf[] ;
-fill Page withcolor \MPcolor{a} ;
-path gr[] ;
-numeric a; a = 2cm ;
-numeric b; b = 0.4cm ;
-numeric c; c = 0.7cm ;
-z.f1 = ulcorner Page shifted (a,-c) ;
-z.f2 = urcorner Page shifted (-a,-c) ;
-z.f3 = z.f2 shifted (0,-b) ;
-z.f4 = z.f1 shifted (0,-b) ;
-gr[1] = z.f1 -- z.f2 ;
-gr[2] = z.f4 -- z.f3 ;
-z.f5 = point .2 along gr[1] ;
-z.f6 = point .2 along gr[2] ;
-z.f7 = point .4 along gr[1] ;
-z.f8 = point .4 along gr[2] ;
-z.f9 = point .6 along gr[1] ;
-z.f10 = point .6 along gr[2] ;
-z.f11 = point .8 along gr[1] ;
-z.f12 = point .8 along gr[2] ;
-gr[3] = z.f1 -- z.f5 -- z.f6 -- z.f4 -- cycle ;
-gr[4] = z.f7 -- z.f5 -- z.f6 -- z.f8 -- cycle ;
-gr[4] := gr[4] enlarged (.02cm,0) ;
-gr[5] = z.f9 -- z.f7 -- z.f8 -- z.f10 -- cycle ;
-gr[5] := gr[5] enlarged (.02cm,0) ;
-gr[6] = z.f11 -- z.f9 -- z.f10 -- z.f12 -- cycle ;
-gr[6] := gr[6] enlarged (.02cm,0) ;
-gr[7] = z.f11 -- z.f2 -- z.f3 -- z.f12 -- cycle ;
-linear_shade(gr[3],0,\MPcolor{One},\MPcolor{Two}) ;
-linear_shade(gr[4],0,\MPcolor{Two},\MPcolor{Three}) ;
-linear_shade(gr[5],0,\MPcolor{Three},\MPcolor{Four}) ;
-linear_shade(gr[6],0,\MPcolor{Four},\MPcolor{Five}) ;
-linear_shade(gr[7],0,\MPcolor{Five},\MPcolor{Six}) ;
-z.f21 = llcorner Page shifted (a,c) ;
-z.f22 = lrcorner Page shifted (-a,c) ;
-z.f23 = z.f22 shifted (0,b) ;
-z.f24 = z.f21 shifted (0,b) ;
-gr[21] = z.f21 -- z.f22 ;
-gr[22] = z.f24 -- z.f23 ;
-z.f25 = point .2 along gr[21] ;
-z.f26 = point .2 along gr[22] ;
-z.f27 = point .4 along gr[21] ;
-z.f28 = point .4 along gr[22] ;
-z.f29 = point .6 along gr[21] ;
-z.f30 = point .6 along gr[22] ;
-z.f31 = point .8 along gr[21] ;
-z.f32 = point .8 along gr[22] ;
-gr[23] = z.f21 -- z.f25 -- z.f26 -- z.f24 -- cycle ;
-gr[24] = z.f27 -- z.f25 -- z.f26 -- z.f28 -- cycle ;
-gr[24] := gr[24] enlarged (.02cm,0) ;
-gr[25] = z.f29 -- z.f27 -- z.f28 -- z.f30 -- cycle ;
-gr[25] := gr[25] enlarged (.02cm,0) ;
-gr[26] = z.f31 -- z.f29 -- z.f30 -- z.f32 -- cycle ;
-gr[26] := gr[26] enlarged (.02cm,0) ;
-gr[27] = z.f31 -- z.f22 -- z.f23 -- z.f32 -- cycle ;
-linear_shade(gr[23],0,\MPcolor{One},\MPcolor{Two}) ;
-linear_shade(gr[24],0,\MPcolor{Two},\MPcolor{Three}) ;
-linear_shade(gr[25],0,\MPcolor{Three},\MPcolor{Four}) ;
-linear_shade(gr[26],0,\MPcolor{Four},\MPcolor{Five}) ;
-linear_shade(gr[27],0,\MPcolor{Five},\MPcolor{Six}) ;
-StopPage ;
-\stopuniqueMPgraphic
-
-\startuseMPgraphic{progress}
-StartPage
-path p[] ;
-p[1] := unitsquare xyscaled(MakeupWidth,.4cm) shifted (2cm,0.7cm) ;
-numeric i; i = (PageNumber - 1)/(NOfPages - 1) ;
-p[2] = ulcorner p[1] -- urcorner p[1] ;
-p[3] = llcorner p[1] -- lrcorner p[1] ;
-pair o[] ;
-o[1] := point i along p[2] ;
-o[2] := point i along p[3] ;
-p[4] = o[1] -- o[2] ;
-p[4] := p[4] enlarged (0,-1pt) ;
-pickup pensquare scaled 2pt ;
-draw p[4] ;
-StopPage
-\stopuseMPgraphic
-
-%D We define these backgrounds as overlays:
-
-\defineoverlay[graybg]
-[\useMPgraphic{gray}]
-
-\defineoverlay[bar]
-[\useMPgraphic{progress}]
-
-%D These are shortcuts to switch backgrounds:
-
-\define\lecback{\setuplayout[header=11mm]\setupbackgrounds[page][background={graybg,bar,slidetitle}]}
-\define\titback{\setuplayout[header=0mm]\setupbackgrounds[page][background={graybg}]}
-\define\picback{\setuplayout[header=0mm]\setupbackgrounds[page][background={graybg,bar}]}
-\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=1.1cm]
-
-%D The symbol for the first level of itemizations.
-
-\definesymbol[1][\useMPgraphic{ItSquare}]
-\setupitemize[1][inmargin]
-
-\protect
-\stopmodule
-
-\endinput
-