%D \module
%D   [       file=mlib-pps,
%D        version=2008.03.25,
%D          title=\METAPOST\ Integrated Graphics,
%D       subtitle=Basics,
%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.

\unprotect

\registerctxluafile{mlib-pps}{1.001}

%D Todo: catch nested graphics like external figures with dummies.

% todo: figure out why this is shifted
%
% \setupbodyfont[palatino]
%
% \starttext
%     \startMPpage
%         draw textext("123") ;
%     \stopMPpage
% \stoptext
%
% A slightly larger picture works ok so maybe there is some kind
% of interference with the page builder.

\newbox \MPtextbox
\newtoks\everyMPLIBsettext % not used

\def\doMPLIBflushenvironment
  {%\writestatus\m!metapost{flushing environment}%
   \clf_mptexget
   \let\MPLIBflushenvironment\relax}% MPenvironments are depricated}

\let\MPLIBflushenvironment\doMPLIBflushenvironment

\unexpanded\def\MPLIBsetNtext#1% #2% box text
  {\MPLIBflushenvironment
   \dowithnextbox{\clf_mpsettext\nextbox #1}\hbox\bgroup
     \meta_set_current_color
     \let\MPLIBflushenvironment\doMPLIBflushenvironment
     \let\next} % gobble open brace

\unexpanded\def\MPLIBsetCtext#1#2% #3% box colorspec text
  {\MPLIBflushenvironment
   \dowithnextbox{\clf_mpsettext\nextbox #1}\hbox\bgroup
     \directcolored[#2]%
     \meta_set_current_color % so, textcolor wins !
     \let\MPLIBflushenvironment\doMPLIBflushenvironment
     \let\next} % gobble open brace

\let\MPLIBsettext\MPLIBsetNtext

\unexpanded\def\MPLIBgettextscaled#1#2#3%  why a copy .. can be used more often
  {\clf_mpgettext\MPtextbox #1%
   \vbox to \zeropoint{\vss\hbox to \zeropoint{\scale[\c!sx=#2,\c!sy=#3]{\raise\dp\MPtextbox\box\MPtextbox}\forcecolorhack\hss}}}

\unexpanded\def\MPLIBfigure#1#2%
  {\setbox\scratchbox\hbox{\externalfigure[#1][\c!mask=#2]}%
   \clf_mpsetsxsy\wd\scratchbox\ht\scratchbox\zeropoint
   \vbox to \zeropoint{\vss\hbox to \zeropoint{\scale[\c!sx=\sx,\c!sy=\sy]{\box\scratchbox}\hss}}}

% horrible (we could inline scale and matrix code):

\unexpanded\def\MPLIBgettextscaledcm#1#2#3#4#5#6#7#8#9% 2-7: sx,rx,ry,sy,tx,ty
  {\clf_mpgettext\MPtextbox #1%
   \setbox\MPbox\hbox\bgroup
     \dotransformnextbox{#2}{#3}{#4}{#5}{#6}{#7}% does push pop ... will be changed to proper lua call (avoid small numbers)
       \vbox to \zeropoint\bgroup
          \vss
          \hbox to \zeropoint \bgroup
           % \scale[\c!sx=#8,\c!sy=#9]{\raise\dp\MPtextbox\box\MPtextbox}%
           % \scale[\c!sx=#8,\c!sy=#9,\c!depth=\v!no]{\box\MPtextbox}%
             \fastsxsy{#8}{#9}{\raise\dp\MPtextbox\box\MPtextbox}%
             % This gives: LuaTeX warning: Misplaced \pdfrestore .. don't ask me why.
             % but I'll retry it some day soon.
             % \dostartscaling{#8}{#9}%
             %   \raise\dp\MPtextbox\box\MPtextbox
             % \dostopscaling
             \forcecolorhack % can go away ... already in the scale macro
             \hss
         \egroup
       \egroup
   \egroup
   \smashbox\MPbox
   \box\MPbox}

\unexpanded\def\MPLIBgraphictext#1% use at mp end
  {\startTEXpage[\c!scale=10000]#1\stopTEXpage}

%D \startbuffer
%D \definelayer[test]
%D
%D \setlayerframed
%D   [test]
%D   [x=\MPx{somepos-1},y=\MPy{somepos-1}]
%D   [width=\MPw{somepos-1},height=\MPh{somepos-1}]
%D   {Whatever we want here!}
%D
%D \setlayerframed
%D   [test]
%D   [x=\MPx{somepos-2},y=\MPy{somepos-2}]
%D   [width=\MPw{somepos-2},height=\MPh{somepos-2}]
%D   {Whatever we need there!}
%D
%D \startuseMPgraphic{oeps}
%D     draw fullcircle scaled 6cm withcolor red ;
%D     register ("somepos-1",5cm,1cm,center currentpicture) ;
%D     register ("somepos-2",4cm,3cm,(-1cm,-2cm)) ;
%D \stopuseMPgraphic
%D
%D \framed[background=test,offset=overlay]{\useMPgraphic{oeps}}
%D \stopbuffer
%D
%D \typebuffer \startlinecorrection \getbuffer \stoplinecorrection

\unexpanded\def\MPLIBpositionwhd#1#2#3#4#5% bp !
  {\dosavepositionwhd{#1}\zerocount{#2\onebasepoint}{#3\onebasepoint}{#4\onebasepoint}{#5\onebasepoint}\zeropoint}

% \def\MPLIBextrapass#1%
%   {\ctxlua{metapost.graphic_extra_pass("#1")}}

%D Experiment

\def\doMPLIBstopgroup#1#2#3#4#5#6% some day this might happen elsewhere
  {\egroup
   \setbox\scratchbox\hbox{\kern\onebasepoint\box\scratchbox}% weird correction
   \wd\scratchbox \dimexpr#5\onebasepoint-#3\onebasepoint+2\onebasepoint\relax
   \ht\scratchbox #6\onebasepoint
   \dp\scratchbox-#4\onebasepoint
   \pdfxform
     attr      {/Group << /S /Transparency /I \ifnum#1=1 true \else false \fi /K \ifnum#1=1 true \else false \fi >>}
     resources {\pdfbackendcurrentresources}
     \scratchbox
   \setbox\scratchbox\hbox\bgroup\kern-\onebasepoint\pdfrefxform\pdflastxform\egroup
   \setbox\scratchbox\hbox\bgroup\kern-\onebasepoint\pdfrefxform\pdflastxform\egroup
   \wd\scratchbox\zeropoint
   \ht\scratchbox\zeropoint
   \dp\scratchbox\zeropoint
   \box\scratchbox
   \endgroup}

\unexpanded\def\MPLIBstartgroup#1#2#3#4#5#6% isolated 0/1, knockout 0/1 llx lly urx ury
  {\begingroup
   \setbox\scratchbox\hbox\bgroup
   \unexpanded\def\MPLIBstopgroup{\doMPLIBstopgroup{#1}{#2}{#3}{#4}{#5}{#6}}}

\protect \endinput
