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%D \module
%D [ file=meta-nod,
%D version=2016.11.23,
%D title=\METAPOST\ Graphics,
%D subtitle=Nodes,
%D author={Alan Braslau and 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.
\registerctxluafile{meta-nod}{}
\unprotect
\defineMPinstance
[nodes]
[\s!format=metafun,
\s!extensions=\v!yes,
\s!initializations=\v!yes,
\c!method=\s!double]
\defineframed
[node]
[\c!frame=\v!off]
\defineframed
[smallnode]
[node]
[\c!foregroundstyle=\small]
% \startMPdefinitions{nodes}
% loadmodule "node" ;
% \stopMPdefinitions
\protect
%D This module provides a simple \TEX\ layer on top of the nodes library that
%D is preloaded in \METAFUN. More information can be found in the manual and
%D article.
%D
%D We strongly advice to use the \METAPOST\ interface and only provide this
%D \TEX\ variant as proof of concept. There are no plans to extend this module
%D because we see no advantage in using a \TEX\ interface over a \METAPOST\
%D one.
%D
%D \startbuffer
%D \startnodes
%D \placenode[0,0]{A}
%D \placenode[1,0]{B}
%D \connectnodes [0,1] [option=doublearrow]
%D \stopnodes
%D
%D \startnodes[dx=2cm,rotation=45]
%D \placenode[0,0]{A}
%D \placenode[1,0]{B}
%D \placenode[1,1]{C}
%D \placenode[0,1]{D}
%D \connectnodes [0,2] [option=doublearrow,label=a,offset=.05]
%D \connectnodes [1,3] [option=doublearrows]
%D \stopnodes
%D
%D \startnodes[dx=2cm,dy=2cm]
%D \nodeMPcode{ahlength := 12pt ; ahangle := 30 ; ahvariant := 1 ;}
%D \mpcode{ahlength := 12pt ; ahangle := 30 ; ahvariant := 1 ;}
%D \placenode[0,1]{\node{A}}
%D \placenode[1,1]{\node{B}}
%D \placenode[0,0]{\node{C}}
%D \placenode[1,0]{\node{D}}
%D \connectnodes [0,3] [option=arrow,label={ }]
%D \connectnodes [1,2] [option=arrow]
%D \stopnodes
%D \stopbuffer
%D
%D \typebuffer
%D
%D \startlinecorrection \getbuffer \stoplinecorrection
\unprotect
\installcorenamespace{metanodes}
\installcorenamespace{metanodesoption}
\installcorenamespace{metanodesalternative}
\installcorenamespace{metanodesposition}
% todo: maybe instances
\installparameterhandler \??metanodes {metanodes}
\installsetuphandler \??metanodes {metanodes}
\setupmetanodes
[\c!option =,
\c!alternative =,
\c!offset =0,
\c!position =,
\c!label =,
\c!dx =2\emwidth,
\c!dy =2\emwidth,
\c!rotation =90,
\c!rulethickness =.5pt,
\c!command =]
\newtoks\t_every_meta_nodes
\newtoks\t_meta_nodes
\let\stopnodes\relax
%D Hm, we started out simple but it now quickly becomes the usual mess of
%D \TEX, \METAPOST\ and \LUA. Hard to understand.
\newcount\c_meta_nodes_n
\unexpanded\def\startnodes
{\dosingleempty\meta_nodes_start}
\def\meta_nodes_start[#1]#2\stopnodes
{\hpack\bgroup
\iffirstargument
\setupcurrentmetanodes[#1]%
\fi
\edef\p_meta_option{\metanodesparameter\c!option}%
\edef\p_meta_alternative{\metanodesparameter\c!alternative}%
\the\t_every_meta_nodes
\c_meta_nodes_n\zerocount
\t_meta_nodes\emptytoks
#2\removeunwantedspaces
% for alan, will be commented:
\writestatus{metanodes}{\detokenize\expandafter{\the\t_meta_nodes}}%
\clf_grph_nodes_initialize
\startMPcode
mfun_node_init(%
\the\dimexpr\metanodesparameter\c!dx\relax,%
\the\dimexpr\metanodesparameter\c!dy\relax,%
\metanodesparameter\c!rotation%
) ;
\the\t_meta_nodes ;
mfun_node_flush ;
\stopMPcode
\clf_grph_nodes_reset
\egroup}
\unexpanded\def\grph_nodes_node
{\dodoubleempty\grph_nodes_node_two}
\def\grph_nodes_node_two[#1][#2]%
{\grph_nodes_node_two_indeed[#1][#2]}
\def\grph_nodes_node_two_indeed[#1,#2][#3]#4%
{\begingroup
\ifsecondargument
\setupcurrentmetanodes[#3]%
\fi
\edef\p_label{#4}%
\edef\p_reference{\metanodesparameter\c!reference}%
\ifx\p_reference\empty\else
\clf_grph_nodes_register{\p_reference}\c_meta_nodes_n\relax
\fi
\normalexpanded{\endgroup\noexpand\etoksapp\t_meta_nodes{%
mfun_node_make(\number#1,\number#2%
\ifx\p_label\empty
,""%
\else
,"\metanodesparameter\c!command{\p_label}"%
\fi
);%
}}%
\advance\c_meta_nodes_n\plusone}
\appendtoks
\let\placenode\grph_nodes_node
\to \t_every_meta_nodes
\unexpanded\def\grph_nodes_fromto
{\dodoubleempty\grph_nodes_fromto_two}
\def\grph_nodes_fromto_two[#1][#2]%
{\grph_nodes_fromto_two_indeed[#1][#2]}% get rid of {n,m}
\letvalue{\??metanodesposition }\empty
\setvalue{\??metanodesposition top}{.top}
\setvalue{\??metanodesposition bottom}{.bot}
\setvalue{\??metanodesposition left}{.lft}
\setvalue{\??metanodesposition right}{.rt}
\setvalue{\??metanodesposition upperleft}{.ulft}
\setvalue{\??metanodesposition topleft}{.ulft}
\setvalue{\??metanodesposition lefttop}{.ulft}
\setvalue{\??metanodesposition upperright}{.urt}
\setvalue{\??metanodesposition topright}{.urt}
\setvalue{\??metanodesposition righttop}{.urt}
\setvalue{\??metanodesposition lowerleft}{.llft}
\setvalue{\??metanodesposition bottomleft}{.llft}
\setvalue{\??metanodesposition leftbottom}{.llft}
\setvalue{\??metanodesposition lowerright}{.lrt}
\setvalue{\??metanodesposition bottomright}{.lrt}
\setvalue{\??metanodesposition rightbottom}{.lrt}
\def\grph_nodes_fromto_two_indeed[#1,#2][#3]% we can't group because etoksapp doesn't like that
{\begingroup
\ifsecondargument
\setupcurrentmetanodes[#3]%
\fi
\edef\p_label {\metanodesparameter\c!label}%
\edef\p_rulethickness{\metanodesparameter\c!rulethickness}%
\edef\p_command {\metanodesparameter\c!command}% better get an error early
\normalexpanded{\endgroup\noexpand\etoksapp\t_meta_nodes{%
\ifcsname\??metanodesalternative\metanodesparameter\c!alternative\endcsname
\lastnamedcs
\else
\csname\??metanodesalternative\endcsname
\fi
\space
mfun_nodes_fromto\begincsname\??metanodesposition\metanodesparameter\c!position\endcsname(%
\metanodesparameter\c!offset,%
% \number#1,\number#2%
\clf_grph_nodes_resolve{#1},\clf_grph_nodes_resolve{#2}%
\ifx\p_label\empty
,""%
\else
,"\ifx\p_command\empty\p_label\else\p_command{\p_label}\fi"%
\fi
)%
\space
\ifcsname\??metanodesoption\metanodesparameter\c!option\endcsname
\lastnamedcs
\else
\csname\??metanodesoption\endcsname
\fi
\space
\ifx\p_rulethickness\empty \else
withpen pencircle scaled \the\dimexpr\p_rulethickness\relax
\fi
;%
}}}
\setvalue{\??metanodesalternative }{draw}
\setvalue{\??metanodesalternative arrow}{drawarrow}
\setvalue{\??metanodesalternative doublearrow}{drawdblarrow}
\setvalue{\??metanodesalternative doublearrows}{drawdoublearrows}
\setvalue{\??metanodesoption }{}
\setvalue{\??metanodesoption dashed}{dashed evenly}
\setvalue{\??metanodesoption dotted}{dashed withdots scaled .5}
\appendtoks
\let\connectnodes\grph_nodes_fromto
\to \t_every_meta_nodes
\unexpanded\def\grph_nodes_code#1%
{\etoksapp\t_meta_nodes{#1}}
\appendtoks
\let\nodeMPcode\grph_nodes_code
\let\mpcode\grph_nodes_code
\to \t_every_meta_nodes
\protect \endinput
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