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|
%D \module
%D [ file=supp-mul,
%D version=1998.03.15,
%D title=\CONTEXT\ Core Macros,
%D subtitle=Multi Column Output,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. Non||commercial use is
%C granted.
\writestatus{loading}{Context Core Macros / Multi Column Output}
\unprotect
%D This one will become core-mul.tex!
%D The following macro's implement a multi||column output
%D routine. The original implementation was based on Donald
%D Knuth's implementation, which was adapted by Craig Platt to
%D support balancing of the last page. I gradually adapted
%D Platt's version to our needs but under certain
%D circumstances things still went wrong. I considered all
%D calls to Platt's \type{\balancingerror} as undesirable.
\startmessages dutch library: columns
title: kolommen
1: maximaal -- kolommen
2: gebruik eventueel \string\filbreak
3: probleempje, probeer [balanceren=nee]
4: plaatsblok boven nog niet mogelijk
5: plaatsblok onder nog niet mogelijk
6: -- plaatsblok(en) opgeschort
7: balanceren afgebroken na 100 stappen
8: gebalanceerd in -- stap(pen)
9: uitlijnen controleren!
10: (minder dan) 1 regel over
11: plaatsblok te breed voor kolom
12: plaatsblok verplaatst naar volgende kolom
13: breed figuur geplaatst boven kolommen
\stopmessages
\startmessages english library: columns
title: columns
1: only -- columns possible
2: use \string\filbreak\space as alternative
3: problems, disable balancing
4: top float not yet supported
5: bottom float not yet supported
6: -- float(s) postponed
7: balancing aborted after 100 steps
8: balanced in -- step(s)
9: check raggedness
10: (less than) 1 line left
11: float to wide for column
12: float moved to next column
13: wide float moved to top of columns
\stopmessages
\startmessages german library: columns
title: Spalten
1: nur -- Spalten moeglich
2: benutzte \string\filbreak\space als Alternative
3: Problem, verwende [ausgleich=nein]
4: Gleitobjekt oben ncoh nicht unterstuetzt
5: Gleitobjekt unten ncoh nicht unterstuetzt
6: -- Gleitobjekt(e) verschoben
7: ausgleich nach 100 Schritten abgebrocheb
8: ausgeglichen nach -- Schritt(en)
9: Ausrichtung ueberpruefen
10: (weniger als) 1 Zeile uebrig
11: Gleitobjekt zu breit fuer Spalte
12: Gleitobjekt in naechste Zeile verschoben
13: breites Gleitobjekt an den Anfang der Spalten verschoben
\stopmessages
%D This completely new implementation can handle enough
%D situations for everyday documents, but is still far from
%D perfect. While at the moment the routine doesn't support
%D all kind of floats, it does support:
%D
%D \startopsomming[opelkaar]
%D \som an unlimitted number of columns
%D \som ragged or not ragged bottoms
%D \som optional balancing without \type{\balancingerrors}
%D \som different \type{\baselineskips}, \type{\spacing},
%D \type{\topskip} and \type{\maxdepth}
%D \som left- and right indentation, e.g. within lists
%D \som moving columns floats to the next column or page
%D \som handling of floats that are to wide for a columns
%D \stopopsomming
%D
%D One could wonder why single and multi||columns modes are
%D still separated. One reason for this is that \TeX\ is not
%D suited well for handling multi||columns. As a result, the
%D single columns routines are more robust. Handling one
%D column as a special case of multi||columns is posible but at
%D the cost of worse float handling, worse page breaking,
%D worse etc. Complicated multi||column page handling should
%D be done in \kap{DTP}||systems anyway.
%D
%D There are three commands provided for entering and leaving
%D multi||column mode and for going to the next column:
%D
%D \interface \type{\beginmulticolumns} \\ \\
%D \interface \type{\endmulticolumns} \\ \\
%D \interface \type{\ejectcolumn} \\ \\
%D
%D This routines are sort of stand||alone. They communicate
%D with the rest of \CONTEXT\ by means of some interface
%D macro's, which we only mention.
%D
%D \interface \type{\nofcolumns} \\
%D the number of columns \\
%D \interface \type{\betweencolumns} \\
%D the stuff between columns \\
%D \interface \type{\finaloutput{action}{box}} \\
%D some kind of \type{\pagebody} and \type{\shipout} \\
%D
%D \interface \type{\ifbalancecolumns} \\
%D balancing the colums or not \\
%D \interface \type{\ifstretchcolumns} \\
%D ragging the bottom or not \\
%D
%D \interface \type{\ifheightencolumns} \\
%D fix the heigh tor not \\
%D \interface \type{\fixedcolumnheight} \\
%D the optional fixed height \\
%D
%D \interface \type{\ifinheritcolumns} \\
%D handle ragging or not \\
%D \interface \type{\ifr@ggedbottom} \\
%D use ragged bottoms \\
%D \interface \type{\ifb@selinebottom} \\
%D put the bottom line on the baseline \\
%D \interface \type{\ifnormalbottom} \\
%D put the bottom line at the baseline \\
%D
%D \interface \type{\usercolumnwidth} \\
%D the calculated width of a column \\
%D \interface \type{\columntextwidth} \\
%D the maximum width of a column \\
%D \interface \type{\columntextheight} \\
%D the minimum width of a column \\
%D
%D \interface \type{\spacingfactor} \\
%D the spacing factor \\
%D \interface \type{\bodyfontsize} \\
%D the (local) bodyfontsize \\
%D \interface \type{\openlineheight} \\
%D the lineheight (including \type{\spacing}) \\
%D
%D \interface \type{\Everybodyfont} \\
%D communication channel to font switching routines \\
%D
%D \interface \type{\global\settopskip} \\
%D set \type{\topskip} \\
%D \interface \type{\setcolumnwarnings} \\
%D set \type{\badness} and \type{\fuzz} \\
%D \interface \type{\setcolumninserts} \\
%D set \type{\insert}'s \\
%D \interface \type{\setvsize} \\
%D set \type{\vsize} and \type{\pagegoal} \\
%D \interface \type{\sethsize} \\
%D set \type{\hsize} \\
%D
%D \interface \type{\flushcolumnfloats} \\
%D push saved column floats (next page) \\
%D \interface \type{\flushcolumnfloat} \\
%D push saved column floats (next column) \\
%D \interface \type{\setcolumnfloats} \\
%D initialize column floats \\
%D
%D \interface \type{\finishcolumnbox} \\
%D do something special (a hook) \\
%D \interface \type{\postprocesscolumnline} \\
%D do something with each columnline (also a hook) \\
%D \interface \type{\currentcolumn} \\
%D the current column \\
%D
%D These interface macro's are called upon or initialized
%D by the multi||column macro's.
%D A lot of footnote stuff added!
\def\columntextwidth {\zetbreedte}
\def\columntextheight {\teksthoogte}
\def\usercolumnwidth {\tekstbreedte}
\def\fixedcolumnheight {\teksthoogte}
\def\betweencolumns {\hskip\bodyfontsize}
\def\setcolumnwarnings {\dontcomplaincolumnboxes}
\def\setcolumninserts {\dontpermitcolumninserts}
\def\setcolumnfloats {} % in CONTEXT used for floats
\def\flushcolumnfloats {} % in CONTEXT used for floats
\def\flushcolumnfloat {} % in CONTEXT used for floats
\def\finishcolumnbox {} % in CONTEXT used for backgrounds
%D In fact, the column height and width are set by mens of
%D two macro's. One can change their meaning if needed:
\def\setcolumntextheight%
{\def\columntextheight{\teksthoogte}}
\def\setcolumntextwidth% % pas op: geen \teksthoogte, anders steeds smaller
{\def\columntextwidth{\zetbreedte}}
%D Both macros are redefined in \CONTEXT\ when backgrounds
%D are applied to columns.
\newcount\nofcolumns \nofcolumns=2
\def\maxnofcolumns {16}
\def\allocatednofcolumns {0}
\newif\ifbalancecolumns \balancecolumnsfalse
\newif\ifstretchcolumns \stretchcolumnsfalse
\newif\ifinheritcolumns \inheritcolumnsfalse
\newif\ifheightencolumns \heightencolumnsfalse
\newbox\partialpage
\newbox\restofpage
\newbox\savedfloatlist
\newdimen\intercolumnwidth
\newdimen\localcolumnwidth
\newdimen\partialpageheight
\newdimen\savedpagetotal
\newtoks\singlecolumnout
%D During initialization the temporary boxes are allocated.
%D This enables us to use as much columns as we want, without
%D exhausting the pool of boxes too fast. We could have packed
%D them in one box, but we've got enough boxes.
%D
%D Two sets of boxes are declared, the txtboxes are used for
%D the text, the topboxes are for moved column floats.
\def\@@txtcol{@@txtcol}
\def\@@topcol{@@topcol}
\def\initializemulticolumns#1%
{\ifnum#1>\maxnofcolumns\relax
\showmessage{\m!columns}{1}{\maxnofcolumns}%
\nofcolumns=\maxnofcolumns
\else
\nofcolumns=#1\relax
\fi
\ifnum\nofcolumns>\allocatednofcolumns\relax
\dorecurse
{#1}
{\ifnum\recurselevel>\allocatednofcolumns\relax
\newbox\next
\global\letvalue{\@@txtcol\recurselevel}=\next
\newbox\next
\global\letvalue{\@@topcol\recurselevel}=\next
\fi}%
\xdef\allocatednofcolumns{\the\nofcolumns}%
\fi
\edef\firstcolumnbox{\getvalue{\@@txtcol1}}%
\edef\firsttopcolumnbox{\getvalue{\@@topcol1}}%
\edef\lastcolumnbox{\getvalue{\@@txtcol\the\nofcolumns}}%
\edef\lasttopcolumnbox{\getvalue{\@@topcol\the\nofcolumns}}}
%D Without going in details we present two macro's which
%D handle the columns. The action which is transfered by the
%D the first and only parameter can do something with
%D \type{\currentcolumnbox}. In case of the mid columns,
%D \type{\firstcolumnbox} and \type{\lastcolumnbox} are handled
%D outside these macro's.
\def\dohandlemidcolumns#1%
{\dorecurse
{\nofcolumns}
{\ifnum\recurselevel>1
\ifnum\recurselevel<\nofcolumns\relax
\edef\currentcolumnbox{\getvalue{\@@txtcol\recurselevel}}%
\edef\currenttopcolumnbox{\getvalue{\@@topcol\recurselevel}}%
\let\currentcolumn=\recurselevel
#1\relax
\fi
\fi}}
\def\dohandleallcolumns#1%
{\dorecurse
{\nofcolumns}
{\edef\currentcolumnbox{\getvalue{\@@txtcol\recurselevel}}%
\edef\currenttopcolumnbox{\getvalue{\@@topcol\recurselevel}}%
\let\currentcolumn=\recurselevel
#1\relax}}
%D Going to a new columns is done by means of a
%D \type{\ejectcolumn}. The following definition does not
%D always work.
\def\ejectcolumn%
{\goodbreak
\showmessage{\m!columns}{2}{}}
%D The next macro should never be called so let's deal with it.
%D There were several solutions to these kind of errors. First
%D we check for a good breakpoint before firing up the
%D multi||column routine (\type{\break} or \type{\allowbreak}).
%D We do the same at the end of the routine
%D (\type{\allowbreak}). These allowances are definitely
%D needed!
%D
%D Some on first sight redundant calls to for instance
%D \type{\setvsize} in the flushing, splitting and balancing
%D macro's can definitely not be omitted! Some are just there
%D to handle situations that only few times arise. One of
%D those can be that the output routine is invoked before
%D everything is taken care of. This happens when we
%D flush (part of) the current page with an \type{\unvbox}
%D with a \type{\pagetotal}~$\approx$ \type{\pagegoal}. One
%D simply cannot balance columns that are just balanced.
%D
%D I hope one never sees the following message. Because it
%D took me a lot of time to develop the multi||columns
%D routines, every (although seldom) warning gives me the
%D creeps!
\def\balancingerror%
{\showmessage{\m!columns}{3}{}%
\finaloutput\unvbox\normalpagebox}
%D Here we present the two \type{\dont...} macro's, which are
%D of course \CONTEXT||specific ones.
\def\dontcomplaincolumnboxes%
{\mindermeldingen}
\def\dontpermitcolumninserts%
{\def\dotopfloat%
{\showmessage{\m!columns}{4}{}%
\doexecfloat}%
\def\dobotfloat%
{\showmessage{\m!columns}{5}{}%
\doexecfloat}}
\def\getinsertionheights\to#1\\% \relax'm
{#1=\!!zeropoint
\def\doaddinsertionheight##1%
{\ifvoid##1\else
\advance#1 by \skip##1
\advance#1 by \ht##1
\fi}%
\doaddinsertionheight\topins
\doaddinsertionheight\botins
\ifcleverfootnotes
\doaddinsertionheight\savedfootins
\else
\doaddinsertionheight\footins
\fi}
%D The local column width is available in the dimension
%D register \type{\localcolumnwidth}, which is calculated as:
\def\setcolumnhsize%
{\setbox0=\hbox
{\parindent\!!zeropoint\betweencolumns}%
\intercolumnwidth=\wd0
\localcolumnwidth=\columntextwidth
\edef\globalcolumnwidth{\the\localcolumnwidth}%
\advance\localcolumnwidth by -\leftskip
\advance\localcolumnwidth by -\rightskip
\advance\localcolumnwidth by -\nofcolumns\intercolumnwidth
\advance\localcolumnwidth by \intercolumnwidth
\divide\localcolumnwidth by \nofcolumns
\usercolumnwidth=\localcolumnwidth
\hsize=\localcolumnwidth} % we don't do it \global
%D One should be aware that when font related dimensions are
%D used in typesetting the in||between material, these
%D dimensions are influenced by bodyfont switches inside
%D multi||column mode.
%D The global width is saved in \type {\globalcolumnwidth}.
%D This value is used when we pack the columns in a \type
%D {\hbox}.
\def\setcolumnvsize%
{\global\vsize=\columntextheight
\ifdim\partialpageheight>\!!zeropoint
\global\advance\vsize by -\partialpageheight
\fi
\getinsertionheights\to\dimen0\\%
\global\advance\vsize by -\dimen0
\ifgridsnapping % evt altijd, nog testen
\getnoflines\vsize
\vsize=\noflines\openlineheight
\advance\vsize by .5\openlineheight % collect enough data
\fi
\global\vsize=\nofcolumns\vsize
\global\pagegoal=\vsize} % let's do it only here
%D It really starts here. After some checks and initializations
%D we change the output routine to continous multi||column
%D mode. This mode handles columns that fill the current and
%D next full pages. The method used is (more or less)
%D multiplying \type{\vsize} and dividing \type{\hsize} by
%D \type{\nofcolumns}. More on this can be found in the
%D \TeX book. We save the top of the current page in box
%D \type{\partialpage}.
%D
%D We manipulate \type{\topskip} a bit, just to be shure that
%D is has no flexibility. This has te be done every time a
%D font switch takles place, because \type{\topskip} can depend
%D on this.
%D
%D Watch the trick with the \type{\vbox}. This way we get the
%D right interlining and white space.
\def\beginmulticolumns%
{\par
\flushfootnotes
\begingroup
\dontshowcomposition
\setcolumntextwidth\relax
\setcolumntextheight\relax
\widowpenalty=0 % is gewoon beter
\clubpenalty=0 % zeker bij grids
\ifsomefloatwaiting
\showmessage{\m!columns}{6}{\the\savednoffloats}%
\global\setbox\savedfloatlist=\box\floatlist
\xdef\restoresavedfloats%
{\global\savednoffloats=\the\savednoffloats
\global\setbox\floatlist=\box\savedfloatlist
\global\noexpand\somefloatwaitingtrue}%
\global\savednoffloats=0
\global\somefloatwaitingfalse
\else
\global\let\restoresavedfloats=\relax
\fi
\dimen0=\pagetotal
\advance\dimen0 by \parskip
\advance\dimen0 by \openlineheight
\ifdim\dimen0<\pagegoal
\allowbreak
\else
% \break Werkt in veel gevallen averechts!
\fi
\appendtoks\topskip=1\topskip\to\everybodyfont
\the\everybodyfont
\initializemulticolumns\nofcolumns
\setcolumninserts
\hangafter=0
\hangindent=\!!zeropoint
\everypar{}%
\ifdim\pagetotal=\!!zeropoint \else
\vbox{\strut}%
\vskip-\openlineheight
\fi
\global\savedpagetotal=\pagetotal
\global\singlecolumnout=\output
\global\output={\global\setbox\partialpage=\vbox{\unvbox\normalpagebox}}%
\eject
\global\partialpageheight=\ht\partialpage
\global\output={\continuousmulticolumnsout}%
\setcolumnfloats
\dohandleallcolumns
{\global\setbox\currenttopcolumnbox=\box\voidb@x}%
\checkbegincolumnfootnotes
\let\sethsize=\setcolumnhsize
\let\setvsize=\setcolumnvsize
\sethsize
\setvsize
\showcomposition}
%D When we leave the multi||column mode, we have to process the
%D not yet shipped out part of the columns. When we don't
%D balance, we simply force a continuous output, but a balanced
%D output is more tricky.
%D
%D First we try to fill up the page and when all or something
%D is left we try to balance things. This is another useful
%D adaption of the ancesters of these macro's. It takes some
%D reasoning to find out what happens and maybe I'm making
%D some mistake, but it works.
%D
%D Unvoiding box \type{\partialpage} is sometimes necessary,
%D e.g. when there is no text given between \type{\begin..}
%D and \type{\end..}. The \type{\par} is needed!
\def\endmulticolumns%
{\dontshowcomposition
\doflushcolumnfloats % added recently
\par
\ifbalancecolumns
\global\output={\continuousmulticolumnsout}%
\goodbreak
\global\output={\balancedmulticolumnsout}%
\else
\goodbreak
\fi
\eject % the prevdepth is important, try e.g. toclist in
\prevdepth\!!zeropoint % columns before some noncolumned text text
\global\output=\singlecolumnout
\ifvoid\partialpage\else
\unvbox\partialpage
\fi
\global\partialpageheight=\!!zeropoint
\endgroup % here
\nofcolumns=1
\setvsize % the outer one!
\checkendcolumnfootnotes
\dosomebreak\allowbreak
\restoresavedfloats}
%D NEW: still to be documented!
\newinsert\savedfootins
\def\checkbegincolumnfootnotes%
{\ifcleverfootnotes
\doflushfootnotes
\ifdim\ht\footins>\!!zeropoint
\global\setbox\savedfootins=\box\footins
\else
\global\setbox\savedfootins=\box\voidb@x
\fi
\global\skip\savedfootins=\skip\footins
\global\count\savedfootins=\count\footins
\setupfootnotes
\else
\global\skip\savedfootins=\skip\footins
\global\setbox\savedfootins=\box\voidb@x
\global\count\savedfootins=\count\footins
\setupfootnotes
\global\multiply\count\footins by \nofcolumns % gaat mis bij lokale
\fi}
\def\checkendcolumnfootnotes%
{\ifcleverfootnotes\ifvoid\savedfootins\else
\global\setbox\footins=\box\savedfootins
\fi\fi
\global\skip\footins=\skip\savedfootins
\global\count\footins=\count\savedfootins}
%D Because some initializations happen three times, we
%D defined a macro for them. The \type{\everypar{}} is
%D needed because we don't want anything to interfere.
\def\setmulticolumnsout%
{\everypar{}%
\setcolumnwarnings
\settopskip
\setmaxdepth
\topskip=1\topskip
\splittopskip=\topskip
\splitmaxdepth=\maxdepth
\boxmaxdepth=\maxdepth
\emergencystretch=\!!zeropoint\relax} % sometimes needed !
%D Flushing the page comes to pasting the columns together and
%D appending the result to box \type{\partialpage}, if not
%D void. I've seen a lot of implementations in which some skip
%D was put between normal text and multi||column text. When we
%D don't want this, the baselines can be messed up. I hope the
%D seemingly complicated calculation of a correction
%D \type{\kern} is adequate to overcome this. Although not
%D watertight, spacing is taken into account and even multiple
%D mode changes on one page go well. But cross your fingers and
%D don't blame me.
%D
%D One of the complications of flushing out the boxes is that
%D \type{\partialpage} needs to be \type{\unvbox}'ed, otherwise
%D there is too less flexibility in the page when using
%D \type{\r@ggedbottom}. It took a lot of time before these
%D kind of problems were overcome. Using \type{\unvbox} at the
%D wrong moment can generate \type{\balancingerror}'s.
%D
%D One can use the macros \type {\maxcolumnheight} and \type
%D {\maxcolumndepth} when generating material between columns
%D as well as postprocessing column lines.
\let\maxcolumnheight=\!!zeropoint
\let\maxcolumndepth =\!!zeropoint
\def\setmaxcolumndimensions%
{\let\maxcolumnheight=\!!zeropoint
\let\maxcolumndepth =\!!zeropoint
\dohandleallcolumns
{\ifdim\ht\currentcolumnbox>\maxcolumnheight
\edef\maxcolumnheight{\the\ht\currentcolumnbox}%
\fi
\ifdim\dp\currentcolumnbox>\maxcolumndepth
\edef\maxcolumndepth{\the\dp\currentcolumnbox}%
\fi}}
\def\flushcolumnedpage%
{\bgroup
\forgetall
\setmulticolumnsout
\showcomposition
\setmaxcolumndimensions
\postprocesscolumns
\dohandleallcolumns % \hbox i.v.m. \showcomposition
{\global\setbox\currentcolumnbox=\hbox to \localcolumnwidth
{\box\currentcolumnbox
\global\wd\currentcolumnbox=\localcolumnwidth
\ifheightencolumns
\global\ht\currentcolumnbox=\fixedcolumnheight
\fi}}%
\setmaxcolumndimensions
\overlaycolumnfootnotes
\setbox0=\vbox
{\hbox to \globalcolumnwidth
{\dohandleallcolumns
{\finishcolumnbox{\hbox{\box\currentcolumnbox}}%
\ifnum\currentcolumn<\nofcolumns
\hfil\betweencolumns\hfil
\fi}}}%
\dohandleallcolumns
{\global\setbox\currenttopcolumnbox=\box\voidb@x}%
\ifvoid\partialpage \else
\ifgridsnapping % do you believe this junk?
\scratchdimen=\savedpagetotal
\advance\scratchdimen by -\ht\partialpage
\advance\scratchdimen by -\dp\partialpage
\advance\scratchdimen by -\topskip
\box\partialpage
\kern\scratchdimen
\else
\unvbox\partialpage
\fi
\fi
\global\partialpageheight=\!!zeropoint
\setvsize
\dosomebreak\nobreak
\dp0=\!!zeropoint
\prevdepth\openstrutdepth % \dp\strutbox
\nointerlineskip
\box0
\egroup}
%D In case one didn't notice, finaly \type{\finishcolumnbox} is
%D applied to all boxes. One can use this hook for special
%D purposes. But there is more:
%D
%D Once upon a time I wanted to manipulate the individual lines
%D in a column. This feature is demonstrated in the two examples
%D below.
%D
%D \startbuffer
%D \def\postprocesscolumnline#1%
%D {\ruledhbox{#1}\hss}
%D
%D \startkolommen[n=4]
%D \dorecurse{25}{line: \recurselevel\par}
%D \stopkolommen
%D \stopbuffer
%D
%D \typebuffer
%D
%D Here we show the natural width of the lines:
%D
%D {\haalbuffer}
%D
%D The next example does a bit more advanced manipulation:
%D
%D \startbuffer
%D \def\postprocesscolumnline#1%
%D {\ifodd\currentcolumn
%D \hfill#1\relax
%D \else
%D \relax#1\hfill
%D \fi}
%D
%D \startkolommen[n=4]
%D \dorecurse{25}{line \recurselevel\par}
%D \stopkolommen
%D \stopbuffer
%D
%D \typebuffer
%D
%D Here we also see an application of \type{\currentcolumn}:
%D
%D {\haalbuffer}
%D
%D This feature is implemented using the reshape macros
%D presented in \type{supp-box}.
\def\postprocesscolumns% recent extension
{\ifx\postprocesscolumnline\undefined \else
\dohandleallcolumns
{\global\setbox\currentcolumnbox=\vtop
{\beginofshapebox
\unvbox\currentcolumnbox
\unskip\unskip
\endofshapebox
\reshapebox
{\dimen0=\ht\shapebox
\dimen2=\dp\shapebox
\setbox\shapebox=\hbox to \hsize
{\postprocesscolumnline{\unhbox\shapebox}}%
\ht\shapebox=\dimen0
\dp\shapebox=\dimen2
\box\shapebox}%
\flushshapebox
\everypar{}\parskip\!!zeropoint % = \forgetall
\strut\endgraf
\vskip-\lineheight
\vfil}}%
\fi}
%D We default to doing nothing!
\let\postprocesscolumnline=\undefined
%D Here comes the simple splitting routine. It's a bit
%D longer than expected because of ragging bottoms or not.
%D This part can be a bit shorter but I suppose that I will
%D forget what happens. The splitting takes some already
%D present material (think of floats) into account!
%D
%D First we present some auxiliary routines. Any material,
%D like for instance floats, that is already present in the
%D boxes is preserved.
% \def\splitcolumn#1from \box#2to \dimen#3 top \box#4%
% {\bgroup
% \ifdim\ht#4>\!!zeropoint
% \dimen0=\dimen#3\relax
% \dimen2=\dimen#3\relax
% \advance\dimen0 by -\ht#4
% \setbox0=\vsplit#2 to \dimen0
% \global\setbox#1=\vbox to \dimen2{\unvcopy#4\unvbox0}%
% \else
% \global\setbox#1=\vsplit#2 to \dimen#3
% \fi
% \egroup}
\def\splitcolumn#1from \box#2to \dimen#3 top \box#4%
{\bgroup
\ifdim\ht#4>\!!zeropoint
\dimen0=\dimen#3\relax
\dimen2=\dimen2
\advance\dimen0 by -\ht#4%
\columnfootnotecorrection{#1}{\dimen0}%
\setbox0=\vsplit#2 to \dimen0
\global\setbox#1=\vbox to \dimen2
{\ifgridsnapping
\dimen0=-\openstrutheight\advance\dimen0 by \topskip
\vskip\dimen0\copy#4\vskip-\dimen0
\else
\unvcopy#4%
\fi
\unvbox0\fakecolumnfootnotes{#1}}%
\else
\ifcleverfootnotes
\columnfootnotecorrection{#1}{\dimen#3}%
\setbox0=\vsplit#2 to \dimen#3%
\global\setbox#1=\vbox to \dimen#3{\unvbox0\fakecolumnfootnotes{#1}}%
\else
\global\setbox#1=\vsplit#2 to \dimen#3%
\fi
\fi
\egroup}
\def\splitcurrentcolumn from \box#1to \dimen#2%
{\splitcolumn\currentcolumnbox from \box#1 to \dimen#2 top \box\currenttopcolumnbox}
\def\splitfirstcolumn from \box#1to \dimen#2%
{\splitcolumn\firstcolumnbox from \box#1 to \dimen#2 top \box\firsttopcolumnbox}
% \def\splitlastcolumn from \box#1to \dimen#2%
% {\global\setbox\lastcolumnbox=\vbox
% {\unvcopy\lasttopcolumnbox
% \unvbox#1}}
\def\splitlastcolumn from \box#1to \dimen#2%
{\global\setbox\lastcolumnbox=\vbox
{\unvcopy\lasttopcolumnbox
\unvbox#1
\fakecolumnfootnotes\lastcolumnbox}}
%D NEW: still to be documented.
\def\fakecolumnfootnotes#1%
{\relax
\ifcleverfootnotes
\ifnum#1=\lastcolumnbox
\ifdim\ht\footins>\!!zeropoint
\vskip\skip\footins
\vskip\ht\footins
\fi
\fi
\fi}
\def\columnfootnotecorrection#1#2%
{\relax
\ifcleverfootnotes
\ifnum#1=\lastcolumnbox\relax
\ifdim\ht\footins>\!!zeropoint
\advance#2 by -\ht\footins
\advance#2 by -\skip\footins
\fi
\fi
\fi}
\def\overlaycolumnfootnotes% VERVANGEN !!!
{\relax
\ifcleverfootnotes\ifdim\ht\footins>\!!zeropoint
\bgroup
%\ifgridsnapping
\scratchdimen=\ht\firstcolumnbox
\advance\scratchdimen by -\openstrutdepth % \dp\strutbox
\getnoflines\scratchdimen
\advance\noflines by -2
\scratchdimen=\noflines\lineheight
\advance\scratchdimen by \topskip
\setbox0=\hbox
{\lower\scratchdimen\vbox{\placefootnoteinserts}}%
\ht0=\openstrutheight % \ht\strutbox
\dp0=\openstrutdepth % \dp\strutbox
\scratchdimen=\ht\lastcolumnbox
\global\setbox\lastcolumnbox=\vbox to \scratchdimen
{\box\lastcolumnbox
\vskip-\scratchdimen
\box0}%
%\else
% \setbox0=\vbox to \ht\lastcolumnbox
% {\vfill\placefootnoteinserts}%
% \scratchdimen=\wd\lastcolumnbox
% \wd0=\wd\lastcolumnbox
% \wd\lastcolumnbox=\!!zeropoint
% \global\setbox\lastcolumnbox=\hbox
% {\box\lastcolumnbox\box0}%
%\fi
\egroup
\fi\fi}
%D Here comes the routine that splits the long box in columns.
%D The macro \type{\flushcolumnfloats} can be used to flush
%D either floats that were present before the multi||column
%D mode was entered, or floats that migrate to next columns.
%D Flushing floats is a delicate process.
\def\continuousmulticolumnsout%
{\bgroup
\setmulticolumnsout
\dontshowcomposition
% \dimen0=\columntextheight
% \advance\dimen0 by -\partialpageheight
% \getinsertionheights\to\dimen2\\% toegevoegd ivm voetnoten
% \ifgridsnapping
% \getnoflines{\dimen2}%
% \advance\dimen0 by -\noflines\openlineheight
%\getnoflines{\dimen0}\dimen0=\noflines\openlineheight
% \else
% \advance\dimen0 by -\dimen2
% \fi
%
\dimen0=\columntextheight
\getinsertionheights\to\dimen2\\% toegevoegd ivm voetnoten
\advance\dimen2 by \partialpageheight
\ifgridsnapping
\getnoflines{\dimen2}%
\advance\dimen0 by -\noflines\openlineheight
\getnoflines{\dimen0}%
\dimen0=\noflines\openlineheight
\else
\advance\dimen0 by -\dimen2
\fi
%
\dohandleallcolumns
{\splitcurrentcolumn from \box\normalpagebox to \dimen0}
\setbox\restofpage=\vbox{\unvbox\normalpagebox}%
\ifinheritcolumns
\ifr@ggedbottom
\dohandleallcolumns
{\global\setbox\currentcolumnbox=\vbox to \dimen0
{\dimen0=\dp\currentcolumnbox
\unvbox\currentcolumnbox
\vskip-\dimen0
\vskip\openstrutdepth % \dp\strutbox
\prevdepth\openstrutdepth % \dp\strutbox
\vfill}}%
\fi
\ifn@rmalbottom
\advance\dimen0 by \maxdepth
\dohandleallcolumns
{\global\setbox\currentcolumnbox=\vbox to \dimen0
{\unvbox\currentcolumnbox}}%
\fi
\ifb@selinebottom
% the columns are on top of the baseline
\fi
\else
\dohandleallcolumns
{\global\setbox\currentcolumnbox=\vbox to \dimen0
{\ifstretchcolumns
\unvbox\currentcolumnbox
\else
\unvbox\currentcolumnbox % wel of niet \unvbox ?
\vfill
\fi}}%
\dohandleallcolumns
{\global\ht\currentcolumnbox=\dimen0}%
\fi
\setbox\partialpage=\vbox{\flushcolumnedpage}%
\finaloutput\box\partialpage
\sethsize
\setvsize
\flushcolumnfloats
\unvbox\restofpage
% \penalty\outputpenalty % gaat gruwelijk mis in opsommingen
\egroup}
%D And this is the balancing stuff. Again, part of the routine
%D is dedicated to handling ragged bottoms, but here we also
%D see some handling concerning the stretching of columns.
%D We set \type{\widowpenalty} at~0, which enables us to
%D balance columns with few lines. The use of \type{\box2} and
%D \type{\box4} garantees a more robust check when skips are
%D used.
\def\balancedmulticolumnsout%
{\bgroup
\setmulticolumnsout
\dontshowcomposition
\widowpenalty=0
\setbox0=\vbox{\unvbox\normalpagebox}%
\ifdim\ht0>\openlineheight
\dimen0=\ht0
\advance\dimen0 by \topskip
\advance\dimen0 by -\baselineskip
\divide\dimen0 by \nofcolumns
\vbadness=\!!tenthousand\relax
\count255=0
\bgroup
\ifgridsnapping
\dimen2=\lineheight
\else
\dimen2=\!!onepoint % RUBISH
\dimen2=\spacingfactor\dimen2
\fi
\loop
\advance\count255 by 1
\global\setbox\restofpage=\copy0\relax
\splitfirstcolumn from \box\restofpage to \dimen0
\dohandlemidcolumns
{\splitcurrentcolumn from \box\restofpage to \dimen0}%
\splitlastcolumn from \box\restofpage to \dimen0
\setbox2=\vbox{\unvcopy\firstcolumnbox}%
\dimen4=\!!zeropoint
\dohandleallcolumns
{\setbox4=\vbox{\unvcopy\currentcolumnbox}%
\dimen6=\ht4
\ifdim\dimen6>\dimen4 \dimen4=\dimen6\fi}%
\ifnum\count255>100\relax
\donefalse
\else\ifdim\dimen4>\ht2
\donetrue
\else
\donefalse
\fi\fi
\ifdone
\advance\dimen0 by \dimen2\relax
\repeat
\dohandleallcolumns
{\global\setbox\currentcolumnbox=\vbox{\unvcopy\currentcolumnbox}}% NIEUW
\ifnum\count255>100\relax
\showmessage{\m!columns}{7}{}%
\else
\showmessage{\m!columns}{8}{\the\count255\space}%
\fi
\egroup
\ifinheritcolumns
\dimen0=\ht\firstcolumnbox
\dimen2=\ht\firstcolumnbox
\advance\dimen2 by -\openlineheight
\dohandleallcolumns
{\dimen4=\ht\currentcolumnbox
\dimen6=10\openlineheight
\global\setbox\currentcolumnbox=\vbox to \dimen0
{\unvbox\currentcolumnbox
\ifdim\dimen4>\dimen6
\ifdim\dimen4<\dimen0
\ifdim\dimen4>\dimen2
\vskip\!!zeropoint % !!
\else
\vskip\openlineheight
\vfill
\fi
\else
\vskip\!!zeropoint
\fi
\else
\vskip\openlineheight
\vfill
\fi}}%
\else
\bgroup
\ifstretchcolumns
\dimen0=\ht\firstcolumnbox
\dimen2=\bottomtolerance\ht\firstcolumnbox
\setbox0=\vbox{\unvcopy\lastcolumnbox}%
\advance\dimen0 by -\ht0\relax
\advance\dimen0 by -\dp0\relax
\ifdim\dimen0>\openlineheight\relax
\ifdim\dimen0>\dimen2\relax
% \stretchcolumnsfalse % beter goed slecht dan slecht goed
\showmessage{\m!columns}{9}{}%
\fi
\fi
\fi
\dohandleallcolumns
{\global\setbox\currentcolumnbox=\vbox to \ht\firstcolumnbox
{\ifstretchcolumns
\unvbox\currentcolumnbox
\else
\box\currentcolumnbox
\vfill
\fi}}%
\egroup
\fi
\else
\showmessage{\m!columns}{10}{}%
\global\setbox\firstcolumnbox=\vbox{\unvbox0}%
\fi
\global\output={\balancingerror}%
\b@selinebottomtrue % forces depth in separation rule
\flushcolumnedpage
\allowbreak
\egroup}
%D The multicolumn mechanism is incorporated in a \CONTEXT\
%D interface, which acts like:
%D
%D \starttypen
%D \startcolumns[n=4,balance=no,stretch=no,line=on]
%D some text
%D \stopcolumns
%D \stoptypen
%D
%D The setup is optional. The default behaviour of columns
%D can be set up with:
%D
%D \starttypen
%D \setupcolumns
%D [n=2,
%D balance=yes,
%D stretch=text,
%D line=off]
%D \stoptypen
%D
%D In this case, stretching is according to the way it's
%D done outside columns (\type{\inheritcolumnstrue}). Also
%D we can setup the \type{tolerance} within a column, the
%D \type{distance} between columns and the fixed
%D \type{height} of a column.
%D Multi||column output: the float routines
%D
%D Here come the routines that handle the placement of column
%D floats. Floats that are to big migrate to the next
%D column. Floats that are too wide, migrate to the top of the
%D next page, where they span as much columns as needed.
%D Floats that are left over from outside the multi||column
%D mode are flushed first. In macro \type{\finaloutput} the
%D topfloats that are left from previous text should be set.
%D
%D When there are some floats in the queue, we inhibit the
%D flushing of floats on top of columns. The number of
%D waiting floats is preswent in \type{\savednoftopfloats} and
%D is saved. As long as there are floats waiting, the topfloats
%D are places as if we are outside multi||column mode. This is
%D neccessary for e.g. multicolumn lists.
%D
%D When all those floats are flushed, we switch to the local
%D flushing routine.
\def\setcolumnfloats%
{\xdef\globalsavednoffloats{\the\savednoffloats}%
\ifnum\globalsavednoffloats>0
\setglobalcolumnfloats
\else
\setlocalcolumnfloats
\fi}
\def\setglobalcolumnfloats%
{\everypar={}%
\let\flushcolumnfloat=\relax
\let\doroomfloat=\relax
\let\flushcolumnfloats=\noflushcolumnfloats}
\def\setlocalcolumnfloats%
{\everypar={\flushfootnotes\flushcolumnfloat\flushmargincontents\checkindentation}
\let\flushcolumnfloat=\doflushcolumnfloat
\let\doroomfloat=\docolumnroomfloat
\let\flushcolumnfloats=\doflushcolumnfloats
\let\dosetbothinserts=\relax
\let\dotopinsertions=\relax}
\def\noflushcolumnfloats%
{\bgroup
\xdef\localsavednoffloats{\the\savednoffloats}%
\global\savednoffloats=\globalsavednoffloats
\dotopinsertions
\xdef\globalsavenoffloats{\the\savednoffloats}%
\ifnum\globalsavednoffloats=0
\setlocalcolumnfloats
\fi
\global\savednoffloats=\localsavednoffloats
\egroup}
%D We need to calculate the amount of free space in a columns.
%D When there is not enough room, we migrate the float to the
%D next column. These macro's are alternatives (and
%D look||alikes) of \type{\doroomfloat}. When a float is to
%D wide, for one column, it is moved to the top of the next
%D page. Of course such moved floats have to be taken into
%D account when we calculate the available space. It's a pitty
%D that such things are no integral part of \TEX.
% \def\getcolumnstatus\column#1\total#2\goal#3\\%
% {\ifdim\pagegoal<\maxdimen
% \dimen0=\pagegoal
% \divide\dimen0 by \nofcolumns
% \dimen2=\!!zeropoint
% \count255=0\relax
% \dimen8=\columntextheight
% \advance\dimen8 by -\partialpageheight
% %\advance\dimen8 by -\maxdepth % recently deleted
% \def\dogetcolumnstatus%
% {\advance\count255 by 1\relax
% \advance\dimen2 by \ht\currenttopcolumnbox
% \advance\dimen2 by \dp\currenttopcolumnbox
% \dimen4=\dimen2\relax
% \advance\dimen4 by \pagetotal
% \dimen6=\count255\dimen8
% \ifdim\dimen4>\dimen6
% \else
% \let\dogetcolumnstatus=\relax
% \fi}%
% \dohandleallcolumns{\dogetcolumnstatus}%
% \ifdim\dimen4=\dimen6
% \dimen4=\!!zeropoint
% \advance\count255 by 1
% \fi
% #1=\count255
% #2=\dimen4
% #3=\dimen6
% \else
% #1=1
% #2=\!!zeropoint
% #3=\teksthoogte
% \advance#3 by -\partialpageheight
% \fi}
\def\getcolumnstatus\column#1\total#2\goal#3\\%
{\ifdim\pagegoal<\maxdimen
\dimen0=\pagetotal
\else
\dimen0=\!!zeropoint
\fi
\dimen2=\!!zeropoint
\count255=0
\dimen8=\columntextheight
\advance\dimen8 by -\partialpageheight
\def\dogetcolumnstatus%
{\advance\count255 by 1
\advance\dimen2 by \ht\currenttopcolumnbox
\advance\dimen2 by \dp\currenttopcolumnbox
\dimen4=\dimen2
\advance\dimen4 by \dimen0
\dimen6=\count255\dimen8
\ifdim\dimen4>\dimen6
\else
\let\dogetcolumnstatus=\relax
\fi}%
\dohandleallcolumns{\dogetcolumnstatus}%
\ifnum\count255=0 \count255=1 \fi
#1=\count255
#2=\dimen4
#3=\dimen6 }
\def\docolumnroomfloat%
{\ifnofloatpermitted
\global\roomforfloatfalse
\else
\bgroup
\getcolumnstatus\column\count255\total\dimen0\goal\dimen2\\%
\ifgridsnapping\ifnum\count255=\nofcolumns\ifvoid\footins\else
\advance\dimen0 by 1.5\openlineheight % nog nodig ?
\fi\fi\fi
\setbox\scratchbox=\vbox
{\blanko[\@@bkvoorwit]
\snaptogrid\vbox{\copy\floatbox}}
\advance\dimen0 by \ht\scratchbox
\advance\dimen0 by .5\lineheight % needed because goal a bit higher
\ifdim\dimen0>\dimen2
\global\roomforfloatfalse
\else
\global\roomforfloattrue
\fi
\egroup
\ifdim\wd\floatbox>\hsize
\showmessage{\m!columns}{11}{}%
\global\roomforfloatfalse
\fi
\fi}
%D Flushing one float is done as soon as possible, i.e.
%D \type{\everypar}. This means that (at the moment)
%D sidefloats are not supported (overulled)!
\newif\ifflushingcolumnfloats \flushingcolumnfloatstrue
\def\doflushcolumnfloat%
{\ifflushingcolumnfloats\ifprocessingverbatim\else\ifsomefloatwaiting
\bgroup
\forgetall
\let\doflushcolumnfloat=\relax
\getcolumnstatus\column\count255\total\dimen0\goal\dimen2\\%
\ifdim\dimen0>\!!zeropoint
\dogetfloat
\ifdim\wd\floatbox>\hsize
\doresavefloat
\else
\setbox2=\vbox
{\blanko[\@@bkvoorwit]
\snaptogrid\vbox{\copy\floatbox}%
\blanko[\@@bknawit]}%
\advance\dimen0 by \ht2
\ifdim\dimen0>\dimen2
\showmessage{\m!columns}{12}{}%
\ifnum\count255<\nofcolumns
\advance\count255 by 1
\edef\currenttopcolumnbox{\getvalue{\@@topcol\the\count255}}%
\ifdim\ht\currenttopcolumnbox=\!!zeropoint
\global\setbox\currenttopcolumnbox=\vbox
{\snaptogrid\vbox{\copy\floatbox}
\witruimte % nodig ?
\blanko[\@@bknawit]}%
\dimen4=\ht\currenttopcolumnbox
\advance\dimen4 by \dp\currenttopcolumnbox
\global\advance\vsize by -\dimen4
\advance\dimen4 by -\pagegoal
\global\pagegoal=-\dimen4
\else
\doresavefloat
\fi
\else
\doresavefloat
\fi
\else
\ifhmode{\setbox0=\lastbox}\fi% waar is die er in geslopen
\par
\ifdim\prevdepth<\!!zeropoint\relax % anders bovenaan kolom witruimte
\else
\blanko[\@@bkvoorwit]
\fi
\flushfloatbox
\blanko[\@@bknawit]
\fi
\fi
\fi
\egroup
\fi\fi\fi}
%D This one looks complicated. Upto \type{\nofcolumns} floats
%D are placed, taking the width of a float into account. This
%D routine can be improved on different ways:
%D
%D \startopsomming[intro,opelkaar]
%D \som taking into account some imaginary baseline, just to
%D get the captions in line
%D \som multipass flushing until as many floats are displaced
%D as possible
%D \stopopsomming
%D
%D When handling lots of (small) floats spacing can get worse
%D because of lining out the columns.
\def\doflushcolumnfloats%
{\bgroup
\forgetall
% \ifnum\savednoffloats>1\relax % no \ifsomefloatwaiting
% \ifnum\savednoffloats>0\relax % no
\ifsomefloatwaiting
\dimen8=\!!zeropoint
\dimen4=\!!zeropoint
\count0=0 % count0 can be used local
\count2=\nofcolumns % count2 can be used local
\dohandleallcolumns
{\ifnum\count0>0\relax % the wide one's reserved space
\global\setbox\currenttopcolumnbox=\vbox
{\snaptogrid\hbox{\vphantom{\copy\floatbox}}%
\witruimte
\blanko[\@@bknawit]}%
\else
\dogetfloat
\ifdim\wd\floatbox>\hsize
\dimen0=\wd\floatbox
\advance\dimen0 by \intercolumnwidth
\dimen2=\hsize
\advance\dimen2 by \intercolumnwidth
\divide\dimen0 by \dimen2
\count0=\dimen0
\advance\count0 by 1
\ifnum\count0>\count2
\doresavefloat
\count0=0
\else
\dimen0=\count0\hsize
\advance\dimen0 by \count0\intercolumnwidth
\advance\dimen0 by -\intercolumnwidth
\global\setbox\floatbox=\hbox to \dimen0
{\hss\hbox{\copy\floatbox}\hss}%
\fi
\showmessage{\m!columns}{13}{}%
\else
% \showmessage{\m!columns}{13}{}%
\fi
\ifdim\ht\floatbox>\!!zeropoint\relax
\global\setbox\currenttopcolumnbox=\vbox
{\snaptogrid\vbox{\copy\floatbox}
\witruimte % nodig ?
\blanko[\@@bknawit]}%
\fi
\dimen6=\ht\currenttopcolumnbox
\advance\dimen6 by \dp\currenttopcolumnbox
\fi
\ifdim\dimen4<\ht\currenttopcolumnbox
\dimen4=\ht\currenttopcolumnbox
\fi
\advance\dimen8 by \dimen6
\advance\count2 by -1
\advance\count0 by -1\relax}%
\setvsize
\global\advance\vsize by -\dimen8
\global\pagegoal=\vsize
\else
\doflushfloats
\fi
\egroup}
%D This were the multi||column routines. They can and need to
%D be improved but at the moment their behaviour is acceptable.
%D
%D One inprovement can be to normalize the height of floats
%D to $n\times$\type{\lineheight} with a macro like:
%D
%D \starttypen
%D \normalizevbox{...}
%D \stoptypen
\protect
\endinput
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