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\startcomponent cover
\product ctxnote
\definecolor [BackgroundColor] [h=cccccc]
\definecolor [OrnamentColor] [h=99ccff]
\definecolor [TitleColor] [h=336699]
\startMPinclusions
def random_hash_frame (expr width, height, offset, linewidth ) =
def delta = ((uniformdeviate .5offset) + .25offset) enddef ;
x1 := offset ; y1 := offset ; x2 := width-offset ; y2 := height-offset ;
drawoptions(withpen pencircle scaled linewidth withcolor transparent(1,.8,\MPcolor{BackgroundColor})) ;
fill z1--(x2,y1)--z2--(x1,y2)--cycle ;
drawoptions(withpen pencircle scaled linewidth withcolor \MPcolor{OrnamentColor}) ;
draw (x1-delta,y1)--(x2+delta,y1) ;
draw (x2,y1-delta)--(x2,y2+delta) ;
draw (x2+delta,y2)--(x1-delta,y2) ;
draw (x1,y2+delta)--(x1,y1-delta) ;
drawoptions();
setbounds currentpicture to unitsquare xscaled width yscaled height ;
enddef ;
\stopMPinclusions
\startuseMPgraphic{TitleGraphic}
for i=1 upto 400 :
offset := uniformdeviate 10pt ;
width := 2*offset + 40pt + uniformdeviate 30pt ;
height := 2*offset + 30pt + uniformdeviate 10pt ;
addto currentpicture also
image(random_hash_frame(width,height,offset,1pt)) shifted
(uniformdeviate OverlayWidth, uniformdeviate OverlayHeight) ;
endfor ;
\stopuseMPgraphic
\defineoverlay [TitleGraphic] [\useMPgraphic{TitleGraphic}]
\setupbackgrounds
[page]
[background={TitleGraphic,NextPage}]
\startstandardmakeup
\startcolor[white]
\startframedtext[middle][width=.8\textwidth,height=5cm]
\dontleavehmode
\blank[.5cm]
\hfil\bfd\ConTeXt\ 学习笔记\hfil
\blank[.5cm]
\hfil\bfc Using MkIV\hfil
\blank[1cm]
\hfil\bfa Li Yanrui (lyanry@gmail.com)\hfil
\stopframedtext
\stopcolor
\blank[14cm]
\stopstandardmakeup
\setupbackgrounds[page]
[background=]
\stopcomponent
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