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%D \module
%D [ file=mp-asnc.mpiv,
%D version=2012.02.19, % was mp-core: 1999.08.01, anchoring
%D title=\CONTEXT\ \METAPOST\ graphics,
%D subtitle=anchored background macros,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
if known context_asnc : endinput ; fi ;
boolean context_asnc ; context_asnc := true ;
% will be replaced
numeric sync_n[], sync_p[][], sync_w[][], sync_h[][], sync_d[][], sync_t[][] ;
pair sync_xy[][] ; color sync_c[][] ;
def ResetSyncTasks =
path SyncPaths[] ; numeric SyncTasks[], NOfSyncPaths, CurrentSyncClass ;
NOfSyncPaths := CurrentSyncClass := 0 ;
if unknown SyncLeftOffset : numeric SyncLeftOffset ; SyncLeftOffset := 0 ; fi ;
if unknown SyncWidth : numeric SyncWidth ; SyncWidth := 0 ; fi ;
if unknown SyncThreshold : numeric SyncThreshold ; SyncThreshold := LineHeight ; fi ;
if unknown SyncColor : color SyncColor ; SyncColor := .5white ; fi ;
if (SyncLeftOffset = 0) and (SyncWidth = 0) :
SyncWidth := if known TextWidth : TextWidth else : -1cm fi ;
fi ;
enddef ;
ResetSyncTasks ;
vardef SyncBox(expr n, i, leftoffset, width, topoffset, bottomoffset) =
save o ; pair o ; o := (xpart llcorner PlainTextArea,ypart sync_xy[n][i]) ;
o shifted (leftoffset,sync_h[n][i]+topoffset) --
o shifted (width+leftoffset,sync_h[n][i]+topoffset) --
o shifted (width+leftoffset,bottomoffset) --
o shifted (leftoffset,bottomoffset) -- cycle
enddef ;
def SetSyncColor(expr n, i, c) =
sync_c[n][i] := c ;
enddef ;
def SetSyncThreshold(expr n, i, th) =
sync_th[n][i] := th ;
enddef ;
vardef TheSyncColor(expr n, i) =
if known sync_c[n][i] : sync_c[n][i] else : SyncColor fi
enddef ;
vardef TheSyncThreshold(expr n, i) =
if known sync_th[n][i] : sync_th[n][i] else : SyncThreshold fi
enddef ;
vardef PrepareSyncTasks(expr n, collapse, extendtop, prestartnext) =
ResetSyncTasks ;
if known sync_n[n] :
CurrentSyncClass := n ;
save ok, l, d ; boolean ok ; ok := false ; NOfSyncPaths := l := 0 ;
for i=1 upto sync_n[n] :
if RealPageNumber > sync_p[n][i] :
l := i ;
elseif RealPageNumber = sync_p[n][i] :
NOfSyncPaths := NOfSyncPaths + 1 ;
if not ok :
if i>1 :
if sync_t[n][i-1] = sync_t[n][i] :
SyncPaths[NOfSyncPaths] := SyncBox(n, i, SyncLeftOffset, SyncWidth, PaperHeight, -PaperHeight) ;
SyncTasks[NOfSyncPaths] := i ;
else :
SyncPaths[NOfSyncPaths] := SyncBox(n, i-1, SyncLeftOffset, SyncWidth, PaperHeight, -PaperHeight) ;
SyncTasks[NOfSyncPaths] := i-1 ;
NOfSyncPaths := NOfSyncPaths + 1 ;
SyncPaths[NOfSyncPaths] := SyncBox(n, i, SyncLeftOffset, SyncWidth, 0, -PaperHeight) ;
SyncTasks[NOfSyncPaths] := i ;
fi ;
else :
SyncPaths[NOfSyncPaths] := SyncBox(n, i, SyncLeftOffset, SyncWidth, 0, -PaperHeight) ;
SyncTasks[NOfSyncPaths] := i ;
fi ;
else :
SyncPaths[NOfSyncPaths] := SyncBox(n, i, SyncLeftOffset, SyncWidth, 0, -PaperHeight) ;
SyncTasks[NOfSyncPaths] := i ;
fi ;
ok := true ;
fi ;
endfor ;
if (NOfSyncPaths = 0) and (l > 0) :
NOfSyncPaths := 1 ;
SyncPaths[NOfSyncPaths] := SyncBox(n, l, SyncLeftOffset, SyncWidth, PaperHeight, -PaperHeight) ;
SyncTasks[NOfSyncPaths] := l ;
fi ;
if NOfSyncPaths > 0 :
for i = 1 upto NOfSyncPaths-1 :
SyncPaths[i] := topboundary SyncPaths[i] -- reverse topboundary SyncPaths[i+1] -- cycle ;
endfor ;
if unknown SyncThresholdMethod :
numeric SyncThresholdMethod ; SyncThresholdMethod := 2 ;
fi ;
if extendtop :
if SyncThresholdMethod = 1 :
if NOfSyncPaths>1 :
d := ypart (ulcorner PlainTextArea - sync_xy[n][SyncTasks[2]]) ;
if (SyncTasks[2]>1) and (d > 0pt) and (d <= TheSyncThreshold(n,sync_t[n][SyncTasks[2]])) and (sync_p[n][SyncTasks[2]] = RealPageNumber) :
SyncPaths[2] := SyncPaths[2] topenlarged PaperHeight ;
fi ;
fi ;
else :
for i = 1 upto NOfSyncPaths :
d := ypart (ulcorner PlainTextArea - sync_xy[n][SyncTasks[i]]) ;
if (d > 0) and (d <= TheSyncThreshold(n,sync_t[n][SyncTasks[i]])) and (sync_p[n][SyncTasks[i]] = RealPageNumber) :
SyncPaths[i] := SyncPaths[i] topenlarged PaperHeight ;
fi ;
endfor ;
fi ;
fi ;
if prestartnext :
if NOfSyncPaths>1 :
if SyncTasks[NOfSyncPaths] < sync_n[n] : % there is a next one
d := ypart (ulcorner PlainTextArea - sync_xy[n][SyncTasks[NOfSyncPaths]+1]) ;
if (d > 0) and (d <= TheSyncThreshold(n, sync_t[n][SyncTasks[i]])) and (sync_p[n][SyncTasks[NOfSyncPaths]+1] = RealPageNumber+1) :
SyncPaths[NOfSyncPaths+1] :=
(xpart ulcorner SyncPaths[NOfSyncPaths],ypart llcorner PlainTextArea) --
(xpart urcorner SyncPaths[NOfSyncPaths],ypart llcorner PlainTextArea) --
lrcorner SyncPaths[NOfSyncPaths] --
llcorner SyncPaths[NOfSyncPaths] -- cycle ;
SyncTasks[NOfSyncPaths+1] := SyncTasks[NOfSyncPaths]+1 ;
NOfSyncPaths := NOfSyncPaths + 1 ;
fi ;
fi ;
fi ;
else :
if NOfSyncPaths>1 :
d := ypart (sync_xy[n][SyncTasks[NOfSyncPaths]] - llcorner PlainTextArea) ;
if (d < TheSyncThreshold(n, SyncTasks[NOfSyncPaths])) :
NOfSyncPaths := NOfSyncPaths - 1 ;
SyncPaths[NOfSyncPaths] := SyncPaths[NOfSyncPaths] bottomenlarged PaperHeight ;
fi ;
fi ;
fi ;
if (NOfSyncPaths>1) and collapse :
save j ; numeric j ; j := 1 ;
for i = 2 upto NOfSyncPaths :
if sync_t[n][SyncTasks[i]] = sync_t[n][SyncTasks[j]] :
SyncPaths[j] := boundingbox image (draw SyncPaths[i] ; draw SyncPaths[j] ; ) ;
SyncTasks[j] := SyncTasks[i] ;
else :
j := j + 1 ;
SyncPaths[j] := SyncPaths[i] ;
SyncTasks[j] := SyncTasks[i] ;
fi ;
endfor ;
NOfSyncPaths := j ;
fi ;
fi ;
fi ;
enddef ;
def SyncTask(expr n) =
if known SyncTasks[n] : SyncTasks[n] else : 0 fi
enddef ;
def FlushSyncTasks =
for i = 1 upto NOfSyncPaths :
ProcessSyncTask(SyncPaths[i], TheSyncColor(CurrentSyncClass,sync_t[CurrentSyncClass][SyncTasks[i]])) ;
endfor ;
enddef ;
def ProcessSyncTask(expr p, c) =
fill p withcolor c ;
enddef ;
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