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diff --git a/Master/texmf-dist/tex/context/base/mkii/anch-pos.mkii b/Master/texmf-dist/tex/context/base/mkii/anch-pos.mkii new file mode 100644 index 00000000000..b86cee5cc03 --- /dev/null +++ b/Master/texmf-dist/tex/context/base/mkii/anch-pos.mkii @@ -0,0 +1,883 @@ +%D \module +%D [ file=anch-pos, +%D version=1999.08.01, +%D title=\CONTEXT\ Anchoring Macros, +%D subtitle=Positioning Support, +%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. + +% needs a cleanup, things may change; we also need to move the mp +% related code to meta-pos + +% shorter tags, ..:achtergrond:.. etc in pos actions + +% dubbele text- * pos's eruit + +% class pos -> als gelijk aan vorige, dan niet niet definieren +% en erven, maw: +% +% 1 -> opslaan +% 2 -> undef, dus == prev +% 3 -> undef, dus == prev +% 4 -> opslaan + +\writestatus{loading}{ConTeXt Anchoring Macros / Positioning} + +% todo: topskip als optie voor eerste regel achtergrond +% todo: build pos layers on top of layers +% todo: positionlayer pos van text-1 etc delen + +%D Although \TEX\ has a rather powerful channel to the outside +%D world, called \type {\special}, real communication with +%D other programs is complicated by the fact that no positional +%D information is available. Mid 1999, I discussed this with +%D \THANH, the author of \PDFTEX, and after some experiments, +%D \PDFTEX\ was extended with a simple but effective mechanism, +%D that provided positional information. The interesting +%D thought is that, although \TEX\ is frozen, similar +%D functionality could have been achieved with \type +%D {\specials} and an additional \DVI\ postprocessor. +%D +%D Since we want to be as compatible as can be, \CONTEXT\ will +%D support both methods, although the development is primarily +%D driven by the \PDFTEX\ way of doing things. Since the +%D mechanism is basically not limited to one application, for +%D the moment we stick to building the functionality around one +%D \CONTEXT\ special command, but at the same time we keep our +%D eyes open for extensions in other directions. +%D +%D A question that may arise when one reads this module, is to +%D what extend these macros are generic, in the sense that they +%D could be collected in a support module instead of a core +%D module. Since the mechanism described here will closely +%D cooperate with the \METAPOST\ support built in \CONTEXT, +%D which in turn will be tightly integrated with the \CONTEXT\ +%D overlay mechanisms, I decided to write a core module instead +%D of a support one. This makes even more sense, when one takes +%D into account that this kind of support depends on special +%D drivers. + +\unprotect + +%D The first application of positional information was embedded +%D graphics. Since we are interacting with text, it made sense +%D to take the current line height and depth into account too. +%D This is why we have two basic position macros: one for +%D simple positions, and one for boxes. +%D +%D We could have sticked to one special, and actually did so in +%D earlier experiments, but for convenience, as well for +%D clearness, we now have two alternatives. This approach will +%D save us quite some bytes when storing large quantities of +%D positional information. We save as less information as +%D needed, that is, we save no dimensions, in a \METAPOST\ +%D friendly way. +%D +%D The three specials involved are: +%D +%D \starttyping +%D \dosetposition {identifier} +%D \dosetpositionwhd {identifier} {width} {height} {depth} +%D \dosetpositionplus {identifier} {width} {height} {depth} {list} +%D \dosetpositionpapersize {width} {height} +%D \stoptyping + +\newbox\positionbox +\newif \ifpositioning + +\def\POSprefix{POS::} + +\def\setpospxy#1#2#3#4% + {\@EA\xdef\csname\POSprefix#1\endcsname + {\number#2,% + \the\dimexpr#3\ifnum\positionanchormode=\plusone-\MPx\pageanchor\fi\relax,% + \the\dimexpr#4\ifnum\positionanchormode=\plusone-\MPy\pageanchor\fi\relax}} + +\def\setpospxywhd#1#2#3#4#5#6#7% + {\@EA\xdef\csname\POSprefix#1\endcsname + {\number#2,% + \the\dimexpr#3\ifnum\positionanchormode=\plusone-\MPx\pageanchor\fi\relax,% + \the\dimexpr#4\ifnum\positionanchormode=\plusone-\MPy\pageanchor\fi\relax,% + \the\dimexpr#5\relax,% + \the\dimexpr#6\relax,% + \the\dimexpr#7\relax}} + +\def\setpospxyplus#1#2#3#4#5#6#7#8% + {\@EA\xdef\csname\POSprefix#1\endcsname + {\number#2,% + \the\dimexpr#3\ifnum\positionanchormode=\plusone-\MPx\pageanchor\fi\relax,% + \the\dimexpr#4\ifnum\positionanchormode=\plusone-\MPy\pageanchor\fi\relax,% + \the\dimexpr#5\relax,% + \the\dimexpr#6\relax,% + \the\dimexpr#7\relax,% + #8}} + +%D This is real tricky! The page anchor is applied to the +%D page box and therefore flushed first. So, when present, it +%D is applied to all positions except itself. + +\chardef\positionanchormode=0 % don't relocate page origin +\chardef\positionanchormode=1 % relocate page origin once + +%D The core set macros. + +\def\pxypos {\pospxy} % obsolete +\def\pxyposwhd {\pospxywhd} % obsolete +\def\pxyposplus{\pospxyplus} % obsolete + +\def\resetpositions + {\let\pospxy \gobblefourarguments + \let\pospxywhd \gobblesevenarguments + \let\pospxyplus\gobbleeightarguments} + +\def\setpositions + {\let\pospxy \setpospxy + \let\pospxywhd \setpospxywhd + \let\pospxyplus\setpospxyplus} + +%D We need to initialize. + +\resetpositions + +\addutilityreset{positions} + +%D Sometimes we want to trick the position handler a bit: + +\def\replacepospxywhd#1#2#3#4#5#6#7% + {\@EA\xdef\csname\POSprefix#1\endcsname + {\number#2,% + \the\dimexpr#3\relax,% + \the\dimexpr#4\relax,% + \the\dimexpr#5\relax,% + \the\dimexpr#6\relax,% + \the\dimexpr#7\relax}} + +%D For postprocessing purposes, we save the number of +%D positions. + +\newcount\currentpositions % current number of positions +\newcounter\totalnofpositions % total from previous run + +\appendtoks + \expanded{\savecurrentvalue\noexpand\totalnofpositions{\the\currentpositions}}% +\to \everybye + +%D The next switch can be used to communicate a special +%D situation. Positioning and associated actions can be +%D executed any time. However, in for instance backgrounds +%D they can be collected in a layer, for instance the text +%D layer (especially the hidden text layer). In the case of +%D floats, we run into problems, since the page information is +%D not applicable when the content floats indeed. In such +%D situations one can treat positions and graphics local. + +\newif\iflocalpositioning + +%D Watch out: sometimes a pagebreak occurs inside a float +%D placement, so there we need to disable local mode. + +\appendtoks + \localpositioningtrue +\to \everyinsidefloat + +\appendtoks + \localpositioningfalse +\to \everypagebody + +\def\checkpositions + {\startnointerference + \protectlabels + \doutilities{positions}\jobname\empty\relax\relax + \global\let\checkpositions\relax + \stopnointerference} + +%D Since the positional values are to be fully expandable, we +%D need to preload them as soon as possible, which is why we +%D load the data when we start a text. + +\appendtoks \checkpositions \to \everystarttext + +%D Positions are either generated at a delayed write time +%D (in \PDFTEX), or derived from the dvi file. The actual +%D method is implemented in a special driver. If needed, the +%D driver can fall back on the following macros. + +\def\dolazysaveposition#1#2#3#4% tag page x y + {\expanded{\writeutilitycommand{\noexpand\pospxy + {#1}{#2}{#3}{#4}}}} + +\def\dolazysavepositionwhd#1#2#3#4#5#6#7% tag page x y w h d + {\expanded{\writeutilitycommand{\noexpand\pospxywhd + {#1}{#2}{#3}{#4}{#5}{#6}{#7}}}} + +\def\dolazysavepositionplus#1#2#3#4#5#6#7#8% tag page x y w h d list + {\expanded{\writeutilitycommand{\noexpand\pospxyplus + {#1}{#2}{#3}{#4}{#5}{#6}{#7}{#8}}}} + +\def\dosaveposition#1#2#3#4% tag page x y + {\expanded{\immediatewriteutilitycommand{\noexpand\pospxy + {#1}{#2}{#3}{#4}}}} + +\def\dosavepositionwhd#1#2#3#4#5#6#7% tag page x y w h d + {\expanded{\immediatewriteutilitycommand{\noexpand\pospxywhd + {#1}{#2}{#3}{#4}{#5}{#6}{#7}}}} + +\def\dosavepositionplus#1#2#3#4#5#6#7#8% tag page x y w h d list + {\expanded{\immediatewriteutilitycommand{\noexpand\pospxyplus + {#1}{#2}{#3}{#4}{#5}{#6}{#7}{#8}}}} + +%D \macros +%D {MPp, MPx, MPy, MPw, MPh, MPd, +%D MPxy, MPll, MPlr, MPur, MPul, MPpos} +%D +%D Access to the positional information is provided by macros +%D with short names that are clearly meant for \METAPOST. + +\def\MPp {\doMPxyhdwlr\doMPp } +\def\MPx {\doMPxyhdwlr\doMPx } +\def\MPy {\doMPxyhdwlr\doMPy } +\def\MPw {\doMPxyhdwlr\doMPw } +\def\MPh {\doMPxyhdwlr\doMPh } +\def\MPd {\doMPxyhdwlr\doMPd } +\def\MPxy {\doMPxyhdwlr\doMPxy } +\def\MPll {\doMPxyhdwlr\doMPll } +\def\MPlr {\doMPxyhdwlr\doMPlr } +\def\MPur {\doMPxyhdwlr\doMPur } +\def\MPul {\doMPxyhdwlr\doMPul } +\def\MPpos{\doMPxyhdwlr\doMPpos} + +\def\doMPp #1,#2,#3,#4,#5,#6,#7\relax{#1} +\def\doMPx #1,#2,#3,#4,#5,#6,#7\relax{#2} +\def\doMPy #1,#2,#3,#4,#5,#6,#7\relax{#3} +\def\doMPw #1,#2,#3,#4,#5,#6,#7\relax{#4} +\def\doMPh #1,#2,#3,#4,#5,#6,#7\relax{#5} +\def\doMPd #1,#2,#3,#4,#5,#6,#7\relax{#6} +\def\doMPxy #1,#2,#3,#4,#5,#6,#7\relax{(#2,#3)} +\def\doMPll #1,#2,#3,#4,#5,#6,#7\relax{(#2,#3-#6)} +\def\doMPlr #1,#2,#3,#4,#5,#6,#7\relax{(#2+#4,#3-#6)} +\def\doMPur #1,#2,#3,#4,#5,#6,#7\relax{(#2+#4,#3+#5)} +\def\doMPul #1,#2,#3,#4,#5,#6,#7\relax{(#2,#3+#5)} +\def\doMPpos#1,#2,#3,#4,#5,#6,#7\relax{#1,#2,#3,#4,#5,#6} + +\def\doMPxyhdwlr#1#2% + {\ifcsname\POSprefix#2\endcsname + \@EA\@EA\@EA#1\csname\POSprefix#2\endcsname,0pt,0pt,0pt,0pt\relax + \else + #10,0pt,0pt,0pt,0pt,0pt,0pt\relax + \fi} + +%D \macros +%D {MPplus, MPrest, MPv, MPvv} +%D +%D Since we will probably keep on extending, we provide a +%D general extension macro. The plus alternative takes an +%D extra argument, denoting what additional parameter to pick +%D up. So, the third extra is fetched with, +%D +%D \starttyping +%D \MPplus{identifier}{3}{default} +%D \stoptyping +%D +%D All extras (comma separated) are fetched with: +%D +%D \starttyping +%D \MPrest{identifier} +%D \stoptyping +%D +%D The extra parameters are not treated. + +\def\MPplus {\MPdoplus\doMPplus} +\def\MPrest#1{\MPdoplus\doMPrest{#1}{}} + +\def\MPdoplus#1#2#3#4% + {\ifcsname\POSprefix#2\endcsname + \@EA\@EA\@EA#1\csname\POSprefix#2\endcsname,,,,,,,,,\relax{#3}% + \else + #4% + \fi} + +\def\doMPplus#1,#2,#3,#4,#5,#6,% + {\dodoMPplus} + +\def\dodoMPplus#1,#2,#3,#4,#5,#6,#7,#8\relax#9% + {\ifcase#9\or#1\or#2\or#3\or#4\or#5\or#6\or#7\else\dododoMPplus#8\relax{#9}\fi} + +\def\dododoMPplus#1,#2,#3,#4,#5,#6,#7,#8\relax#9% + {\ifcase#9\or\or\or\or\or\or\or\or#1\or#2\or#3\or#4\or#5\or#6\or#7\fi} + +\def\doMPrest#1,#2,#3,#4,#5,#6,#7,,#8\relax#9% + {#7} + +%D \macros +%D {MPanchor} +%D +%D For readability we define a few synonyms: + +\def\MPanchor{\MPpos} + +%D \macros +%D {POSp, POSx, POSy, POSh, POSd, POSw} +%D +%D and: + +\def\POSp{\MPp} \def\POSx{\MPx} \def\POSy{\MPy} +\def\POSh{\MPh} \def\POSd{\MPd} \def\POSw{\MPw} + +%D There are two low level positioning macros. Both store the +%D position as well as execute an action associated with that +%D position. + +\def\initializenextposition + {\ifpositioning \else + \global\positioningtrue + \dosetpositionpapersize + {\printpaperwidth }% + {\printpaperheight}% + \fi + \global\advance\currentpositions\plusone} + +\def\setpositiononly#1% + {\iftrialtypesetting + % nothing + \else + \initializenextposition + \def\currentposition{#1}% + \dosetposition\currentposition + \fi} + +\def\setposition#1% + {\iftrialtypesetting + % nothing + \else + \initializenextposition + \def\currentposition{#1}% + \dosetposition\currentposition + \traceposstring\llap\green{\currentposition>}% + \dopositionaction\currentposition + \fi} + +\def\setpositiondata#1#2#3#4% + {\iftrialtypesetting \else + \initializenextposition + \hbox + {\def\currentposition{#1}% + \dosetpositionwhd\currentposition + {\the\dimexpr#2\relax}% + {\the\dimexpr#3\relax}% + {\the\dimexpr#4\relax}% + \traceposstring\llap\green{\currentposition>}% + \dopositionaction\currentposition + \hss}% + \fi} + +\def\setpositionbox#1% + {\dowithnextbox + {\iftrialtypesetting + \flushnextbox + \else + \initializenextposition + \hbox to \nextboxwd + {\edef\currentposition{#1}% + \dosetpositionwhd\currentposition + {\the\nextboxwd}% + {\the\nextboxht}% + {\the\nextboxdp}% + \traceposstring\llap\green{\currentposition>}% + \setbox\positionbox\flushnextbox + \dopositionaction\currentposition + \box\positionbox + \hss}% + \fi}} + +\def\setpositiondataplus#1#2#3#4#5% + {\iftrialtypesetting \else + \initializenextposition + \hbox % bug: to \nextboxwd + {\edef\currentposition{#1}% + \dosetpositionplus\currentposition + {\the\dimexpr#2\relax}% + {\the\dimexpr#3\relax}% + {\the\dimexpr#4\relax}% + {#5}% + \traceposstring\rlap\magenta{<\currentposition}% + \dopositionaction\currentposition + \hss}% + \fi} + +\def\setpositionplus#1#2% + {\dowithnextbox + {\iftrialtypesetting + \flushnextbox + \else + \initializenextposition + \hbox to \nextboxwd + {\edef\currentposition{#1}% + \dosetpositionplus\currentposition + {\the\nextboxwd}% + {\the\nextboxht}% + {\the\nextboxdp}% + {#2}% + \traceposstring\rlap\magenta{<\currentposition}% + \setbox\positionbox\flushnextbox + \dopositionaction\currentposition + \box\positionbox + \hss}% + \fi}} + +\let\currentposition\s!unknown + +%D A few more low level macros take care of defining and +%D recalling actions. We could save this information in the +%D position containers themselves, this would save hash +%D entries, but at the cost of much more time consuming +%D expansion. Actions are saved globally! + +\newtoks\everypositionaction + +\let\POSactionprefix\POSprefix + +\def\dosetpositionaction#1% + {\setgvalue{\POSactionprefix#1::}} + +%D The lists can become quite long (also because there can +%D be lots of parameters passed on) so we provide a hook +%D to clean up the list afterwards. + +\let\cleanuppositionaction\gobbleoneargument + +\def\doifpositionaction#1% + {\ifcsname\POSactionprefix#1::\endcsname + \@EA\firstofoneargument + \else + \@EA\gobbleoneargument + \fi} + +\def\doifpositionactionelse#1% + {\ifcsname\POSactionprefix#1::\endcsname + \@EA\firstoftwoarguments + \else + \@EA\secondoftwoarguments + \fi} + +%D We can copy a position with: +%D +%D \starttyping +%D \copyposition {to} {from} +%D \stoptyping +%D +%D Again, this is a global action. + +\def\copyposition#1#2% + {\ifcsname\POSprefix#2\endcsname + \global\@EA\let\csname\POSprefix#1\@EA\endcsname\csname\POSprefix#2\endcsname + \fi} + +%D The fact that handling positions is a two pass operation, is +%D one of the reasons why we need to be able to test for +%D existence, using: +%D +%D \starttyping +%D \doifpositionelse {identifier} {found action} {not found action} +%D \stoptyping + +\def\doifpositionelse#1% + {\ifcsname\POSprefix#1\endcsname + \expandafter\firstoftwoarguments + \else + \expandafter\secondoftwoarguments + \fi} + +%D We have now arrived at a few macros that would make sense as +%D support macros, but ended up in the core. + +%D \macros +%D {xypos} +%D +%D We have several macros available to save positions. Later +%D we will see applications. +%D +%D \starttabulate[|l|l||] +%D \NC \type {\xypos} \NC \NC simple position with no dimensions \NC \NR +%D \NC \type {\hpos} \NC \NC position and characteristics of a \type {\hbox} \NC \NR +%D \NC \type {\vpos} \NC \NC position and characteristics of a \type {\vbox} \NC \NR +%D \NC \type {\bpos} \NC b: \NC begin point in a line \NC \NR +%D \NC \type {\epos} \NC e: \NC end point in a line \NC \NR +%D \NC \type {\fpos} \NC f: \NC begin point in a paragraph \NC \NR +%D \NC \type {\tpos} \NC t: \NC end point in a paragraph \NC \NR +%D \stoptabulate +%D +%D Each macro takes an identifier as argument, and the \type +%D {\hpos} and \type {\vpos} also expect box content. + +% \def\xypos{\initializenextposition\dosetposition} + +\let\xypos\setpositiononly + +\def\hpos#1{\dontleavehmode\setpositionbox{#1}\hbox} +\def\vpos#1{\setpositionbox{#1}\vbox} + +\def\bpos#1{\hpos{b:#1}{\strut}\ignorespaces} +\def\epos#1{\removelastspace\hpos{e:#1}{\strut}} + +\def\fpos#1% + {\setpositionplus{b:#1}{\number\parposcounter}\horizontalstrut + \ignorespaces} + +\def\tpos#1% + {\removelastspace + \setpositionplus{e:#1}{\number\parposcounter}\horizontalstrut} + +\def\ffpos#1% + {\setpositionplus{b:#1}{\number\parposcounter}\horizontalstrut\wpos{#1}% + \ignorespaces} + +\def\ttpos#1% + {\removelastspace + \setpositionplus{e:#1}{\number\parposcounter}\horizontalstrut} + +\def\wpos#1% + {\dontleavehmode\vadjust % may disappear if buried + {\setbox0\hbox{\raise\strutdp\hbox{\rawwpos{#1}}}% + \rlap{\smashedbox0}}} + +\def\wwpos#1% \hsmashed{\llap{\rawwpos{#1}}} + {\rlap + {\setbox0\hbox{\rawwpos{#1}}% + \smashedbox0}} + +\def\rawwpos#1% + {\hpos{w:#1} + {\strut + \hskip-\leftskip + \hskip\hsize + \hskip-\rightskip}} + +% the next macro disables par positions (in inner boxes) and +% only registers the width + +\def\setinnerparpositions + {\let\fpos\ffpos + \let\tpos\ttpos + \let\wpos\wwpos} + +% example of usage: (see for application "techniek") +% +% \appendtoks +% \setinnerparpositions +% \to \everytabulate + +%D When we want to calculate more complex backgrounds, we +%D need to know what the current indentation scheme is. At +%D the cost of many positions and memory, we can keep track +%D of them. This mechanism is activated automatically +%D based on information collected in the previous pass. + +\newcount\parposcounter + +\newif\ifpositioningpar + +% we can check for used entries, and if not, then not add one + +\def\enableparpositions % global + {\global\positioningtrue + \global\positioningpartrue} + +\def\disableparpositions % local + {\positioningparfalse} + +\def\registerparoptions + {\ifpositioningpar \ifpositioning \iftrialtypesetting \else + \ifinpagebody \else \ifmmode \else \ifinformula \else + \ifprocessingverbatim + \iflinepar \doregisterparoptions \fi + \else + \doregisterparoptions + \fi + \fi \fi \fi + \fi \fi \fi} + +\chardef\parposstrut=1 % 0 => no strut data, so fall backs used + +\newif\iftracepositions + +% \def\doregisterparoptions +% {\global\advance\parposcounter\plusone +% \begingroup +% \leftskip 1\leftskip +% \rightskip1\rightskip +% \setpositiondataplus +% {p:\number\parposcounter}% identifier +% {\the\zeropoint}% +% {\the\strutht}% +% {\the\strutdp}% +% {\the\hsize ,% 1 +% \the\leftskip ,% 2 +% \the\rightskip ,% 3 +% \the\hangindent,% 4 +% \the\hangafter ,% 5 (num) +% \the\parindent }% 6 +% %\normalhbox{\registerparsymbol}% +% \registerparsymbol +% \endgroup} + +\def\doregisterparoptions + {\global\advance\parposcounter\plusone + \setpositiondataplus + {p:\number\parposcounter}% identifier + {\the\zeropoint}% + {\the\strutht}% + {\the\strutdp}% + {\the\hsize,\the\dimexpr\leftskip\relax,\the\dimexpr\rightskip\relax,\the\hangindent,\the\hangafter,\the\parindent}% + %\normalhbox{\registerparsymbol}% + \iftracepositions\registerparsymbol\fi} + +\def\traceposstring#1#2#3% + {\iftracepositions + \smashedhbox + {#1{\infofont#2#3}% + \scratchdimen.5\points + \kern-2\scratchdimen + \vrule\!!width4\scratchdimen\!!height\scratchdimen\!!depth\scratchdimen}% + \fi} + +\def\registerparsymbol + {\iftracepositions + \smashedhbox to \zeropoint + {\hss + \startcolor[blue]% + \llap{\infofont\number\parposcounter}% + \scratchdimen\onepoint + \vrule + \!!width 4\scratchdimen + \!!height2\scratchdimen + \!!depth 2\scratchdimen + \stopcolor + \hss}% + \fi} + +% \appendtoks \registerparoptions \to \everypar + +%D Eperimental code, don't use this yet: (must be sped up anyway) + +\def\@@noden{node:n:} +\def\@@nodeo{node:o:} +\def\@@nodep{node:p:} + +\def\doifelsenodelocation#1% + {\ifcsname\@@noden#1\endcsname + \expandafter\firstoftwoarguments + \else + \expandafter\secondoftwoarguments + \fi} + +\def\nextnodelocation#1% + {\ifcsname\@@noden#1\endcsname\pluscounter{\@@noden#1}\fi} + +\def\newnodelocation#1% + {\ifcsname\@@noden#1\endcsname + \setcounter{\@@noden#1}\zerocount + \letgvalue {\@@nodeo#1}\!!zerocount + \fi} + +\def\tagnodelocation#1% + {\ifcsname\@@noden#1\endcsname\xypos{\@@nodep#1:\countervalue{\@@noden#1}}\fi} + +\def\getnodelocationp#1{\MPp{\@@nodep#1:\countervalue{\@@noden#1}}} +\def\getnodelocationx#1{\MPx{\@@nodep#1:\countervalue{\@@noden#1}}} +\def\getnodelocationy#1{\MPy{\@@nodep#1:\countervalue{\@@noden#1}}} + +\def\numnodelocationp#1#2{\MPp{\@@nodep#1:\number#2}} +\def\numnodelocationx#1#2{\MPx{\@@nodep#1:\number#2}} +\def\numnodelocationy#1#2{\MPy{\@@nodep#1:\number#2}} + +\def\getnodelocationn#1{\countervalue{\@@noden#1}} +\def\getnodelocationo#1{\getvalue {\@@nodeo#1}} + +\chardef\nodelocationmode\plusone + +\def\analyzenodelocation#1% + {\ifcsname\@@noden#1\endcsname + \doanalyzenodelocation{#1}{\getnodelocationn{#1}}\zerocount + \fi} + +\def\doanalyzenodelocation#1#2#3% class n default + {\begingroup + \donefalse + \ifcase\nodelocationmode + % do nothing + \else + \edef\nodelocationselfn{#2}% + \edef\nodelocationselfp{\numnodelocationp{#1}\nodelocationselfn}% + \edef\nodelocationselfx{\numnodelocationx{#1}\nodelocationselfn}% + \edef\nodelocationselfy{\numnodelocationy{#1}\nodelocationselfn}% + \scratchcounter\plusone + \doloop + {\ifnum\recurselevel=\nodelocationselfn\relax + \donetrue + \else + \edef\nodelocationotherp{\numnodelocationp{#1}\recurselevel}% + \edef\nodelocationotherx{\numnodelocationx{#1}\recurselevel}% + \edef\nodelocationothery{\numnodelocationy{#1}\recurselevel}% + \ifcase\nodelocationmode + \or + % ok for single column + \ifcase\nodelocationotherp\relax + \exitloop + \else\ifnum\nodelocationotherp<\nodelocationselfp\relax + \donetrue \advance\scratchcounter\plusone + \else\ifnum\nodelocationotherp>\nodelocationselfp\relax + % skip + \else\ifdim\nodelocationothery>\nodelocationselfy\relax + \donetrue \advance\scratchcounter\plusone + \else\ifdim\nodelocationothery<\nodelocationselfy\relax + % skip + \else\ifdim\nodelocationotherx<\nodelocationselfx\relax + \donetrue \advance\scratchcounter\plusone + \fi\fi\fi\fi\fi\fi + \or + % acceptable for double column + \ifcase\nodelocationotherp\relax + \exitloop + \else\ifnum\nodelocationotherp<\nodelocationselfp\relax + \donetrue \advance\scratchcounter\plusone + \else\ifnum\nodelocationotherp>\nodelocationselfp\relax + % skip + \else\ifnum\recurselevel>\nodelocationselfn\relax + \donetrue \exitloop + \else + \donetrue \advance\scratchcounter\plusone + \fi\fi\fi\fi + \else + \exitloop + \fi + \fi}% + \fi + \ifdone \else + \scratchcounter#3\relax + \fi + \setxvalue{\@@nodeo#1}{\the\scratchcounter}% + \endgroup} + +\unexpanded\def\shownodelocation#1% + {\ifcsname\@@noden#1\endcsname + \analyzenodelocation{#1}% + (#1,% + n:\getnodelocationn{#1},% + p:\getnodelocationp{#1},% + x:\getnodelocationx{#1},% + y:\getnodelocationy{#1},% + o:\getnodelocationo{#1})% + \fi} + +%D \macros +%D {doifoverlappingelse} +%D +%D A first application of positional information, is to +%D determine if two boxes do overlap: +%D +%D \starttyping +%D \doifoverlappingelse{point a}{point b} +%D {action when overlapping} +%D {action when not overlapping} +%D \stoptyping + +\def\overlappingmargin{-2\scaledpoint} + +\def\doifoverlappingelse#1#2% + {\begingroup + \donefalse + \edef\!!stringa{#1}\edef\!!stringb{#2}% + \ifnum\MPp\!!stringa=\MPp\!!stringb\relax + \!!dimena\MPx\!!stringa + \!!dimenb\dimexpr\MPx\!!stringa+\MPw\!!stringa\relax + \!!dimenc\dimexpr\MPy\!!stringa-\MPd\!!stringa\relax + \!!dimend\dimexpr\MPy\!!stringa+\MPh\!!stringa\relax + \!!dimene\MPx\!!stringb + \!!dimenf\dimexpr\MPx\!!stringb+\MPw\!!stringb\relax + \!!dimeng\dimexpr\MPy\!!stringb-\MPd\!!stringb\relax + \!!dimenh\dimexpr\MPy\!!stringb+\MPh\!!stringb\relax + \ifdim\overlappingmargin=\zeropoint\else + \advance\!!dimena-\overlappingmargin + \advance\!!dimenb+\overlappingmargin + \advance\!!dimenc-\overlappingmargin + \advance\!!dimend+\overlappingmargin + \advance\!!dimene-\overlappingmargin + \advance\!!dimenf+\overlappingmargin + \advance\!!dimeng-\overlappingmargin + \advance\!!dimenh+\overlappingmargin + \fi + % more often eh fb eg fg + \def\checkone##1##2% + {\ifdim##1<\!!dimena \else \ifdim##1>\!!dimenb \else + \ifdim##2<\!!dimenc \else \ifdim##2>\!!dimend \else + \donetrue + \fi\fi + \fi\fi}% + \def\checktwo##1##2% + {\ifdim##1<\!!dimene \else \ifdim##1>\!!dimenf \else + \ifdim##2<\!!dimeng \else \ifdim##2>\!!dimenh \else + \donetrue + \fi\fi + \fi\fi}% + \checkone\!!dimene\!!dimeng \ifdone \else + \checkone\!!dimene\!!dimenh \ifdone \else + \checkone\!!dimenf\!!dimeng \ifdone \else + \checkone\!!dimenf\!!dimenh \ifdone \else + \checktwo\!!dimena\!!dimenc \ifdone \else + \checktwo\!!dimena\!!dimend \ifdone \else + \checktwo\!!dimenb\!!dimene \ifdone \else + \checktwo\!!dimenb\!!dimenc \fi \fi \fi \fi \fi \fi \fi + \fi + \ifdone + \endgroup\expandafter\firstoftwoarguments + \else + \endgroup\expandafter\secondoftwoarguments + \fi} + +%D \macros +%D {doifpositionsonsamepageelse, +%D doifpositionsonthispageelse} +%D +%D Instead of letting the user handle fuzzy expansion, we +%D provide a simple test on positione being on the same page. +%D +%D \starttyping +%D \doifpositionsonsamepageelse{point a}{point b} +%D {action when on same page} +%D {action when not on same page} +%D \doifpositionsonthispageelse{point a}{point b} +%D {action when on this page} +%D {action when not on this page} +%D \stoptyping + +\def\dodoifpositionsonsamepageelse#1#2#3#4% + {\bgroup + \scratchcounter#1\donefalse + \def\docommand##1% + {\ifcase\scratchcounter + \scratchcounter\MPp{##1}\donetrue + \else + \ifnum\scratchcounter=\MPp{##1}\relax\else\donefalse\fi + \fi}% + \rawprocesscommalist[#2]\docommand + \ifdone\egroup#3\else\egroup#4\fi} + +\def\doifpositionsonsamepageelse{\dodoifpositionsonsamepageelse\!!zerocount} +\def\doifpositionsonthispageelse{\dodoifpositionsonsamepageelse\realfolio } + +%D Plugins: + +\let\MPv \MPplus +\let\MPvv\MPrest + +\let\MPanchor\MPpos + +\let\POSp\MPp \let\POSx\MPx \let\POSy\MPy +\let\POSh\MPh \let\POSd\MPd \let\POSw\MPw + +\protect \endinput |