/usr/share/texlive/texmf-dist/metapost/base/boxes.mp is in texlive-metapost 2013.20140215-1.
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% Public domain.
% Macros for boxes
% Find the length of the prefix of string s for which cond is true for each
% character c of the prefix
vardef str_prefix(expr s)(text cond) =
save i_, c; string c;
i_ = 0;
forever:
c := substring (i_,i_+1) of s;
exitunless cond;
exitif incr i_=length s;
endfor
i_
enddef;
% Take a string returned by the str operator and return the same string
% with explicit numeric subscripts replaced by generic subscript symbols [].
%
% Fixed version supplied by Eddie Kohler
vardef generisize (expr ss) =
save res, s, stest, l; string res, s, stest;
res = ""; % result so far
s = ss; % left to process
forever: exitif s="";
l := str_prefix(s, (c<>"[") and ((c<"0") or (c>"9")));
res := res & substring (0,l) of s;
s := substring (l,infinity) of s;
if s<>"":
if (s>="[") and (length s > 1):
stest := substring (1,2) of s;
if stest="[":
l := 2;
res := res & "[[";
else:
l := 1 + str_prefix(s, c<>"]");
res := res & "[]";
fi
else:
res := res & "[]";
l := str_prefix(s, (c=".") or ("0"<=c) and (c<="9"));
fi
s := substring(l,infinity) of s;
fi
endfor
res
enddef;
% Make sure the string _n_gen_ is generisize(_n_):
vardef set_n_gen_ =
if _n_ <> _n_cur_:
_n_cur_:=_n_;
_n_gen_:=generisize(_n_);
fi
enddef;
string _n_, _n_cur_, _n_gen_;
_n_cur_ := "]"; % this won't match _n_
% Given a type t and list of variable names vars, make sure that they are
% of type t and redeclare them as necessary. In the vars list _n represents
% scantokens _n_, a suffix that might contain numeric subscripts.
% This suffix needs to be replaced by scantokens _n_gen_ in order to get
% a variable that can be declared to be of type t.
vardef generic_declare(text t) text vars =
set_n_gen_;
forsuffixes v_=vars:
if forsuffixes _n=scantokens _n_: not t v_ endfor:
def _gdmac_ text _n = t v_ enddef;
expandafter _gdmac_ scantokens _n_gen_;
fi
endfor
enddef;
% Here is another version that redeclares the vars even if they are already
% of the right type.
vardef generic_redeclare(text t) text vars =
set_n_gen_;
def _gdmac_ text _n = t vars enddef;
expandafter _gdmac_ scantokens _n_gen_;
enddef;
% pp should be a string giving the name of a macro that finds the boundary path
% sp should be a string that names a macro for fixing the size and shape
% The suffix $ is the name of the box
% The text t gives the box contents: either empty, a picture, or a string to
% typeset
def beginbox_(expr pp,sp)(suffix $)(text t) =
_n_ := str $;
generic_declare(pair) _n.off, _n.c;
generic_declare(string) pproc_._n, sproc_._n;
generic_declare(picture) pic_._n;
pproc_$:=pp; sproc_$:=sp;
pic_$ := nullpicture;
for _p_=t:
pic_$:=
if picture _p_: _p_
else: _p_ infont defaultfont scaled defaultscale
fi;
endfor
$c = $off + .5[llcorner pic_$, urcorner pic_$]
enddef;
% The suffix cl names a vardef macro that clears box-related variables
% The suffix $ is the name of the box being ended.
def endbox_(suffix cl, $) =
if known pic_.prevbox: _dojoin(prevbox,$); fi
def prevbox = $ enddef;
expandafter def expandafter clearboxes expandafter =
clearboxes cl($);
enddef
enddef;
% Text t gives equations for joining box a to box b.
def boxjoin(text t) =
def prevbox=_ enddef;
def _dojoin(suffix a,b) = t enddef;
enddef;
extra_beginfig := extra_beginfig
& "boxjoin();save pic_,sproc_,pproc_;def clearboxes=enddef;";
extra_endfig := extra_endfig & "clearboxes;";
% Given a list of box names, give whatever default values are necessary
% in order to fix the size and shape of each box.
vardef fixsize(text t) =
forsuffixes $=t: scantokens sproc_$($); endfor
enddef;
% Given a list of box names, give default values for any unknown positioning
% offsets
vardef fixpos(text t) =
forsuffixes $=t:
if unknown xpart $.off: xpart $.off=0; fi
if unknown ypart $.off: ypart $.off=0; fi
endfor
enddef;
% Return the boundary path for the given box
vardef bpath suffix $ =
fixsize($); fixpos($);
scantokens pproc_$($)
enddef;
% Return the contents of the given box. First define a private version that
% the user can't accidently clobber.
vardef pic_mac_ suffix $ =
fixsize($); fixpos($);
pic_$ shifted $off
enddef;
vardef pic suffix $ = pic_mac_ $ enddef;
def drawboxed(text t) = % Draw each box
fixsize(t); fixpos(t);
forsuffixes s=t: draw pic_mac_.s; draw bpath.s; endfor
enddef;
def drawunboxed(text t) = % Draw contents of each box
fixsize(t); fixpos(t);
forsuffixes s=t: draw pic_mac_.s; endfor
enddef;
def drawboxes(text t) = % Draw boundary path for each box
forsuffixes s=t: draw bpath.s; endfor
enddef;
% Rectangular boxes
newinternal defaultdx, defaultdy;
defaultdx := defaultdy := 3bp;
vardef boxit@#(text tt) =
beginbox_("boxpath_","sizebox_",@#,tt);
generic_declare(pair) _n.sw, _n.s, _n.se, _n.e, _n.ne, _n.n, _n.nw, _n.w;
0 = xpart (@#nw-@#sw) = ypart(@#se-@#sw);
0 = xpart(@#ne-@#se) = ypart(@#ne-@#nw);
@#w = .5[@#nw,@#sw];
@#s = .5[@#sw,@#se];
@#e = .5[@#ne,@#se];
@#n = .5[@#ne,@#nw];
@#ne-@#c = @#c-@#sw = (@#dx,@#dy) + .5*(urcorner pic_@# - llcorner pic_@#);
endbox_(clearb_,@#);
enddef;
def boxpath_(suffix $) =
$.sw -- $.se -- $.ne -- $.nw -- cycle
enddef;
def sizebox_(suffix $) =
if unknown $.dx: $.dx=defaultdx; fi
if unknown $.dy: $.dy=defaultdy; fi
enddef;
vardef clearb_(suffix $) =
_n_ := str $;
generic_redeclare(numeric) _n.sw, _n.s, _n.se, _n.e, _n.ne, _n.n, _n.nw, _n.w,
_n.c, _n.off, _n.dx, _n.dy;
enddef;
% Circular and oval boxes
newinternal circmargin; circmargin:=2bp; % default clearance for picture corner
vardef circleit@#(text tt) =
beginbox_("thecirc_","sizecirc_",@#,tt);
generic_declare(pair) _n.n, _n.s, _n.e, _n.w;
@#e-@#c = @#c-@#w = (@#dx,0) + .5*(lrcorner pic_@#-llcorner pic_@#);
@#n-@#c = @#c-@#s = (0,@#dy) + .5*(ulcorner pic_@#-llcorner pic_@#);
endbox_(clearc_,@#);
enddef;
def thecirc_(suffix $) =
$.e{up} ... $.n{left} ... $.w{down} ... $.s{right} ... cycle
enddef;
vardef clearc_(suffix $) =
_n_ := str $;
generic_redeclare(numeric) _n.n, _n.s, _n.e, _n.w, _n.c, _n.off, _n.dx, _n.dy;
enddef;
vardef sizecirc_(suffix $) =
save a_, b_;
(a_,b_) = .5*(urcorner pic_$ - llcorner pic_$);
if unknown $dx:
if unknown $dy:
if unknown($dy-$dx): a_+$dx=b_+$dy; fi
if a_+$dx=b_+$dy: a_+$dx = a_++b_ + circmargin;
else: $dx =
pathsel_(max(a_,b_+$dx-$dy), (a_+d_,0){up}...(0,b_+d_+$dy-$dx){left});
fi
else: $dx = pathsel_(a_, (a_+d_,0){up}...(0,b_+$dy){left});
fi
elseif unknown $dy:
$dy = pathsel_(b_, (a_+$dx,0){up}...(0,b_+d_){left});
fi
enddef;
vardef pathsel_(expr dhi)(text tt) =
save f_, p_; path p_;
p_ = origin..(a_,b_)+circmargin*unitvector(a_,b_);
vardef f_(expr d_) =
xpart((tt) intersectiontimes p_) >= 0
enddef;
solve f_(0,dhi+1.5circmargin)
enddef;
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