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%D This example dates from late 2001, and ws probaby made for some \TEX\ related
%D meeting. It's a relative simple example that uses a few function from a general
%D \JAVASCRIPT\ preamble. In fact forcing the \type {FieldStack} code into the
%D is the only adaptation from \MKII\ to \MKIV\ (because we load on demand and here
%D the code is ude sindirectly).
%D
%D Nowadays we could layers instead which is probably a bit more ligthweight than
%D widgets. Also, we should actually synchronize the time but on the other hand, but
%D on the other hand, now it's a sort of stopwatch.
% \nopdfcompression
\starttext
\useJSscripts[fld]
\useJSpreamble[FieldStack]
\definepapersize
[clock]
[width=2.5cm,
height=2.5cm]
\setuppapersize
[clock][clock]
\setuplayout
[header=0pt,
footer=0pt,
backspace=.25cm,
topspace=.25cm,
width=middle,
height=middle]
\startJSpreamble stepper used now
var state = 0 ;
var more = 0 ;
var step = 0 ;
function step_clock() {
try {
if (more == 60) {
more = 0 ;
Walk_Field("more") ;
} else {
}
more += 1 ;
Walk_Field("clock") ;
this.dirty = false ;
} catch (e) {
}
}
function start_clock() {
try {
if (state == 0) {
step = app.setInterval ("step_clock()", 1000) ;
step.count = 0 ;
state = 1 ;
} else if (state == 1) {
app.clearInterval (step) ;
state = 2 ;
} else if (state == 2) {
app.clearInterval (step) ;
Reset_Fields("more") ;
Reset_Fields("clock") ;
Set_Field("more", "1") ;
Set_Field("clock", "1") ;
more = 0 ;
state = 0 ;
}
} catch(e) {
}
}
function stop_clock () {
try {
app.clearInterval(step) ;
} catch(e) {
}
}
\stopJSpreamble
\definereference[StopClock] [JS(stop_clock)]
\definereference[StartClock][JS(start_clock)]
\setupinteraction
[state=start,
closeaction={StopClock,ForgetChanges},
closepageaction={StopClock}]
\startreusableMPgraphic{common}
drawoptions(withpen pencircle scaled 1mm withcolor .4white) ;
fill fullsquare scaled 2.5cm ;
drawoptions(withpen pencircle scaled 1mm withcolor .6green) ;
draw fullsquare scaled 2.5cm ;
drawoptions(withpen pencircle scaled 1mm withcolor .6red) ;
draw fullcircle scaled 2cm ;
drawoptions(withpen pencircle scaled 2mm withcolor .6yellow) ;
for i=1 upto 12 :
draw (0,1cm) rotated ((i-1)*(360/12)) ;
endfor ;
\stopreusableMPgraphic
\startuseMPgraphic{clock}
numeric stp ; stp := (\MPvar{n}-1)*(360/60) ;
pair p ; p := (0,\MPvar{l}-.5mm) ;
drawoptions(withpen pencircle scaled 1mm withcolor .6\MPvar{c}) ;
draw (origin -- p) rotated -stp ;
draw (p shifted (-2mm,-2.5mm)--p--p shifted (2mm,-2.5mm)) rotated -stp ;
setbounds currentpicture to fullsquare scaled 2cm ;
drawoptions(withpen pencircle scaled 2mm withcolor .6white) ;
draw origin ;
\stopuseMPgraphic
\defineoverlay [common] [\reuseMPgraphic{common}]
\defineoverlay [start] [\overlaybutton{StartClock}]
\setupbackgrounds
[page]
[background={common,start}]
\let\clocklist\empty
\let\morelist \empty
\dorecurse {60} {
\appendtocommalist{step:#1}\clocklist
\definesymbol
[step:#1]
[\useMPgraphic{clock}{n=#1,l=1cm,c=blue}]
\appendtocommalist{more:#1}\morelist
\definesymbol
[more:#1]
[\useMPgraphic{clock}{n=#1,l=.75cm,c=green}]
}
\definefieldstack
[clock]
[\clocklist]
[width=2cm,height=2cm,offset=overlay,frame=off]
\definefieldstack
[more]
[\morelist]
[width=2cm,height=2cm,offset=overlay,frame=off]
\starttext
\startoverlay
{\fieldstack[more]}
{\fieldstack[clock]}
\stopoverlay
\stoptext
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