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authorHans Hagen <pragma@wxs.nl>2011-09-12 22:49:00 +0200
committerHans Hagen <pragma@wxs.nl>2011-09-12 22:49:00 +0200
commit4cfc854a468fdfb00073bfad6067174da6b80b0d (patch)
treefb9d51c3c560b7f98b0ed8cc758fef1a4669b20c /metapost
parent56ce2a8ba7ff7e971378ef62c519cddf86de26c8 (diff)
downloadcontext-4cfc854a468fdfb00073bfad6067174da6b80b0d.tar.gz
beta 2011.09.12 22:49
Diffstat (limited to 'metapost')
-rw-r--r--metapost/context/base/metafun.mpii2
-rw-r--r--metapost/context/base/metafun.mpiv2
-rw-r--r--metapost/context/base/mp-base.mpii (renamed from metapost/context/base/mp-base.mp)0
-rw-r--r--metapost/context/base/mp-base.mpiv860
4 files changed, 862 insertions, 2 deletions
diff --git a/metapost/context/base/metafun.mpii b/metapost/context/base/metafun.mpii
index 4d8dc2537..705900a18 100644
--- a/metapost/context/base/metafun.mpii
+++ b/metapost/context/base/metafun.mpii
@@ -28,7 +28,7 @@
%D end even may use a patched version, we prefer to use a
%D copy.
-input mp-base.mp ;
+input mp-base.mpii ;
input mp-tool.mp ;
input mp-spec.mpii ;
input mp-core.mpii ;
diff --git a/metapost/context/base/metafun.mpiv b/metapost/context/base/metafun.mpiv
index 59ca2c4bd..89a7c3935 100644
--- a/metapost/context/base/metafun.mpiv
+++ b/metapost/context/base/metafun.mpiv
@@ -16,7 +16,7 @@
%D end even may use a patched version, we prefer to use a
%D copy.
-input mp-base.mp ;
+input mp-base.mpiv ;
input mp-tool.mp ;
input mp-core.mpiv ;
input mp-page.mp ;
diff --git a/metapost/context/base/mp-base.mp b/metapost/context/base/mp-base.mpii
index 93cb5e90c..93cb5e90c 100644
--- a/metapost/context/base/mp-base.mp
+++ b/metapost/context/base/mp-base.mpii
diff --git a/metapost/context/base/mp-base.mpiv b/metapost/context/base/mp-base.mpiv
new file mode 100644
index 000000000..cd0c79728
--- /dev/null
+++ b/metapost/context/base/mp-base.mpiv
@@ -0,0 +1,860 @@
+% This is a reformatted copy of the plain.mp file. We use a copy
+% because (1) we want to make sure that there are no unresolved
+% dependencies, and (2) we may patch this file eventually.
+
+% This file gives the macros for plain MetaPost It contains all the
+% features of plain METAFONT except those specific to font-making.
+% There are also a number of macros for labeling figures, etc.
+
+string base_name, base_version ;
+
+base_name := "plain" ;
+base_version := "0.63" ;
+
+message "Preloading the plain mem file, version " & base_version ;
+
+delimiters () ; % this makes parentheses behave like parentheses
+
+def upto =
+ step 1 until
+enddef ;
+
+def downto =
+ step -1 until
+enddef ;
+
+def exitunless expr c =
+ exitif not c
+enddef ;
+
+let relax = \ ; % ignore the word `relax', as in TeX
+let \\ = \ ; % double relaxation is like single
+
+def ]] = % right brackets should be loners
+ ] ]
+enddef ;
+
+def -- =
+ {curl 1}..{curl 1}
+enddef ;
+
+def --- =
+ .. tension infinity ..
+enddef ;
+
+def ... =
+ .. tension atleast 1 ..
+enddef ;
+
+def gobble primary g =
+enddef ;
+
+primarydef g gobbled gg =
+enddef ;
+
+def hide(text t) =
+ exitif numeric begingroup t ; endgroup ;
+enddef ;
+
+def ??? =
+ hide (
+ interim showstopping : =1 ;
+ showdependencies
+ )
+enddef ;
+
+def stop expr s =
+ message s ;
+ gobble readstring
+enddef ;
+
+warningcheck :=1 ;
+tracinglostchars :=1 ;
+
+def interact = % sets up to make "show" commands stop
+ hide (
+ showstopping := 1 ;
+ tracingonline := 1 ;
+ )
+enddef ;
+
+def loggingall = % puts tracing info into the log
+ tracingcommands := 3 ;
+ tracingtitles := 1 ;
+ tracingequations := 1 ;
+ tracingcapsules := 1 ;
+ tracingspecs := 2 ;
+ tracingchoices := 1 ;
+ tracinglostchars := 1 ;
+ tracingstats := 1 ;
+ tracingoutput := 1 ;
+ tracingmacros := 1 ;
+ tracingrestores := 1 ;
+enddef ;
+
+def tracingall = % turns on every form of tracing
+ tracingonline := 1 ;
+ showstopping := 1 ;
+ loggingall
+enddef ;
+
+def tracingnone = % turns off every form of tracing
+ tracingcommands := 0 ;
+ tracingtitles := 0 ;
+ tracingequations := 0 ;
+ tracingcapsules := 0 ;
+ tracingspecs := 0 ;
+ tracingchoices := 0 ;
+ tracinglostchars := 0 ;
+ tracingstats := 0 ;
+ tracingoutput := 0 ;
+ tracingmacros := 0 ;
+ tracingrestores := 0 ;
+enddef ;
+
+%% dash patterns
+
+vardef dashpattern(text t) =
+ save on, off, w ;
+ let on = _on_ ;
+ let off = _off_ ;
+ w = 0 ;
+ nullpicture t
+enddef ;
+
+tertiarydef p _on_ d =
+ begingroup save pic ;
+ picture pic;
+ pic = p ;
+ addto pic doublepath (w,w) .. (w+d,w) ;
+ w := w + d ;
+ pic shifted (0,d)
+ endgroup
+enddef;
+
+tertiarydef p _off_ d =
+ begingroup w:=w+d;
+ p shifted (0,d)
+ endgroup
+enddef;
+
+%% basic constants and mathematical macros
+
+% numeric constants
+
+newinternal eps, epsilon,infinity, _ ;
+
+eps := .00049 ; % this is a pretty small positive number
+epsilon := 1/256/256 ; % but this is the smallest
+infinity := 4095.99998 ; % and this is the largest
+_ := -1 ; % internal constant to make macros unreadable but shorter
+
+% linejoin and linecap types
+
+newinternal mitered, rounded, beveled, butt, squared ;
+
+mitered := 0 ; rounded := 1 ; beveled := 2 ;
+butt := 0 ; rounded := 1 ; squared := 2 ;
+
+% pair constants
+
+pair right, left, up, down, origin;
+
+origin = (0,0) ;
+up = -down = (0,1) ;
+right = -left = (1,0) ;
+
+% path constants
+
+path quartercircle, halfcircle, fullcircle, unitsquare ;
+
+fullcircle = makepath pencircle ;
+halfcircle = subpath (0,4) of fullcircle ;
+quartercircle = subpath (0,2) of fullcircle ;
+unitsquare = (0,0) -- (1,0) -- (1,1) -- (0,1) -- cycle ;
+
+% transform constants
+
+transform identity ;
+
+for z=origin,right,up :
+ z transformed identity = z ;
+endfor
+
+% color constants
+
+color black, white, red, green, blue, background;
+
+black = (0,0,0) ;
+white = (1,1,1) ;
+red = (1,0,0) ;
+green = (0,1,0) ;
+blue = (0,0,1) ;
+background = white ;
+
+% picture constants
+
+picture blankpicture, evenly, withdots ;
+
+blankpicture = nullpicture ; % display blankpicture...
+evenly = dashpattern(on 3 off 3) ; % dashed evenly
+withdots = dashpattern(off 2.5 on 0 off 2.5) ; % dashed withdots
+
+% string constants
+
+string ditto, EOF ;
+
+ditto = char 34 ; % ASCII double-quote mark
+EOF = char 0 ; % end-of-file for readfrom and write..to
+
+% pen constants
+
+pen pensquare, penrazor, penspeck ;
+
+pensquare = makepen(unitsquare shifted -(.5,.5)) ;
+penrazor = makepen((-.5,0)--(.5,0)--cycle) ;
+penspeck = pensquare scaled eps ;
+
+% nullary operators
+
+vardef whatever =
+ save ? ;
+ ?
+enddef ;
+
+% unary operators
+
+let abs = length ;
+
+vardef round primary u =
+ if numeric u :
+ floor(u+.5)
+ elseif pair u :
+ (round xpart u, round ypart u)
+ else :
+ u
+ fi
+enddef ;
+
+vardef ceiling primary x =
+ -floor(-x)
+enddef ;
+
+vardef byte primary s =
+ if string s :
+ ASCII
+ fi s
+enddef ;
+
+vardef dir primary d =
+ right rotated d
+enddef ;
+
+vardef unitvector primary z =
+ z/abs z
+enddef ;
+
+vardef inverse primary T =
+ transform T_ ;
+ T_ transformed T = identity ;
+ T_
+enddef ;
+
+vardef counterclockwise primary c =
+ if turningnumber c <= 0 :
+ reverse
+ fi c
+enddef ;
+
+vardef tensepath expr r =
+ for k=0 upto length r - 1 :
+ point k of r ---
+ endfor
+ if cycle r :
+ cycle
+ else :
+ point infinity of r
+ fi
+enddef ;
+
+vardef center primary p =
+ .5[llcorner p, urcorner p]
+enddef ;
+
+% binary operators
+
+primarydef x mod y =
+ (x-y*floor(x/y))
+enddef ;
+
+primarydef x div y =
+ floor(x/y)
+enddef ;
+
+primarydef w dotprod z =
+ (xpart w * xpart z + ypart w * ypart z)
+enddef ;
+
+primarydef x**y =
+ if y=2 :
+ x*x
+ else :
+ takepower y of x
+ fi
+enddef ;
+
+def takepower expr y of x =
+ if x>0 :
+ mexp(y*mlog x)
+ elseif (x=0) and (y>0) :
+ 0
+ else :
+ 1
+ if y = floor y :
+ if y >= 0 :
+ for n=1 upto y :
+ *x
+ endfor
+ else :
+ for n=-1 downto y :
+ /x
+ endfor
+ fi
+ else :
+ hide(errmessage "Undefined power: " & decimal x&"**"&decimal y)
+ fi
+ fi
+enddef ;
+
+vardef direction expr t of p =
+ postcontrol t of p - precontrol t of p
+enddef ;
+
+vardef directionpoint expr z of p =
+ a_ := directiontime z of p ;
+ if a_<0 :
+ errmessage("The direction doesn't occur") ;
+ fi
+ point a_ of p
+enddef ;
+
+secondarydef p intersectionpoint q =
+ begingroup
+ save x_, y_ ;
+ (x_,y_) = p intersectiontimes q ;
+ if x_<0 :
+ errmessage("The paths don't intersect") ;
+ origin
+ else :
+ .5[point x_ of p, point y_ of q]
+ fi
+ endgroup
+enddef;
+
+tertiarydef p softjoin q =
+ begingroup
+ c_ := fullcircle scaled 2join_radius shifted point 0 of q ;
+ a_ := ypart(c_ intersectiontimes p) ;
+ b_ := ypart(c_ intersectiontimes q) ;
+ if a_<0 :
+ point 0 of p{direction 0 of p}
+ else :
+ subpath(0,a_) of p
+ fi
+ ...
+ if b_<0 :
+ {direction infinity of q} point infinity of q
+ else :
+ subpath(b_,infinity) of q
+ fi
+ endgroup
+enddef ;
+
+newinternal join_radius, a_, b_ ; path c_ ;
+
+
+path cuttings ; % what got cut off
+
+tertiarydef a cutbefore b = % tries to cut as little as possible
+ begingroup
+ save t ;
+ (t, whatever) = a intersectiontimes b ;
+ if t<0 :
+ cuttings := point 0 of a ;
+ a
+ else :
+ cuttings := subpath (0,t) of a ;
+ subpath (t,length a) of a
+ fi
+ endgroup
+enddef ;
+
+tertiarydef a cutafter b =
+ reverse (reverse a cutbefore b)
+ hide(cuttings := reverse cuttings)
+enddef;
+
+% special operators
+
+vardef incr suffix $ = $:=$+1; $ enddef ;
+vardef decr suffix $ = $:=$-1; $ enddef ;
+
+def reflectedabout(expr w,z) = % reflects about the line w..z
+ transformed
+ begingroup
+ transform T_ ;
+ w transformed T_ = w ;
+ z transformed T_ = z ;
+ xxpart T_ = -yypart T_ ;
+ xypart T_ = yxpart T_ ; % T_ is a reflection
+ T_
+ endgroup
+enddef ;
+
+def rotatedaround(expr z, d) = % rotates d degrees around z
+ shifted -z rotated d shifted z
+enddef ;
+
+let rotatedabout = rotatedaround ; % for roundabout people
+
+vardef min(expr u)(text t) = % t is a list of numerics, pairs, or strings
+ save u_ ;
+ setu_ u ;
+ for uu = t :
+ if uu<u_ :
+ u_ := uu ;
+ fi
+ endfor
+ u_
+enddef ;
+
+vardef max(expr u)(text t) = % t is a list of numerics, pairs, or strings
+ save u_ ;
+ setu_ u ;
+ for uu = t :
+ if uu>u_ :
+ u_ := uu ;
+ fi
+ endfor
+ u_
+enddef ;
+
+def setu_ primary u =
+ if pair u :
+ pair u_
+ elseif string u :
+ string u_
+ fi ;
+ u_=u
+enddef ;
+
+def flex(text t) = % t is a list of pairs
+ hide (
+ n_ := 0 ;
+ for z=t :
+ z_[incr n_] := z ;
+ endfor
+ dz_ := z_[n_]-z_1
+ )
+ z_1 for k=2 upto n_-1 :
+ ... z_[k]{dz_}
+ endfor ... z_[n_]
+enddef ;
+
+newinternal n_; pair z_[],dz_;
+
+def superellipse(expr r,t,l,b,s) =
+ r{up} ... (s[xpart t,xpart r],s[ypart r,ypart t]){t-r} ...
+ t{left} ... (s[xpart t,xpart l],s[ypart l,ypart t]){l-t} ...
+ l{down} ... (s[xpart b,xpart l],s[ypart l,ypart b]){b-l} ...
+ b{right} ... (s[xpart b,xpart r],s[ypart r,ypart b]){r-b} ... cycle enddef ;
+
+vardef interpath(expr a,p,q) =
+ for t=0 upto length p-1 :
+ a[point t of p, point t of q] .. controls a[postcontrol t of p, postcontrol t of q] and a[precontrol t+1 of p, precontrol t+1 of q] ..
+ endfor
+ if cycle p :
+ cycle
+ else :
+ a[point infinity of p, point infinity of q]
+ fi
+enddef ;
+
+vardef solve@#(expr true_x,false_x)= % @#(true_x)=true, @#(false_x)=false
+ tx_:=true_x; fx_:=false_x;
+ forever :
+ x_ := .5[tx_,fx_] ;
+ exitif abs(tx_-fx_) <= tolerance ;
+ if @#(x_) :
+ tx_
+ else :
+ fx_
+ fi := x_ ;
+ endfor
+ x_ % now x_ is near where @# changes from true to false
+enddef ;
+
+newinternal tolerance, tx_, fx_, x_ ;
+
+tolerance := .01 ;
+
+vardef buildcycle(text ll) =
+ save ta_, tb_, k_, i_, pp_ ; path pp_[] ;
+ k_ = 0 ;
+ for q=ll :
+ pp_[incr k_] = q ;
+ endfor
+ i_ = k_ ;
+ for i=1 upto k_ :
+ (ta_[i], length pp_[i_]-tb_[i_]) = pp_[i] intersectiontimes reverse pp_[i_] ;
+ if ta_[i]<0 :
+ errmessage("Paths "& decimal i &" and "& decimal i_ &" don't intersect") ;
+ fi
+ i_ := i;
+ endfor
+ for i=1 upto k_ :
+ subpath (ta_[i],tb_[i]) of pp_[i] ..
+ endfor
+ cycle
+enddef ;
+
+%% units of measure
+
+mm := 2.83464 ;
+pt := 0.99626 ;
+dd := 1.06601 ;
+bp := 1 ;
+cm := 28.34645 ;
+pc := 11.95517 ;
+cc := 12.79213 ;
+in := 72 ;
+
+vardef magstep primary m =
+ mexp(46.67432m)
+enddef ;
+
+%% macros for drawing and filling
+
+def drawoptions(text t) =
+ def _op_ = t enddef
+enddef ;
+
+% parameters that effect drawing
+
+linejoin := rounded ;
+linecap := rounded ;
+miterlimit := 10 ;
+
+drawoptions() ;
+
+pen currentpen ;
+picture currentpicture ;
+
+def fill expr c =
+ addto currentpicture contour c _op_
+enddef ;
+
+def draw expr p =
+ addto currentpicture
+ if picture p :
+ also p
+ else :
+ doublepath p withpen currentpen
+ fi
+ _op_
+enddef ;
+
+def filldraw expr c =
+ addto currentpicture contour c withpen currentpen _op_
+enddef ;
+
+def drawdot expr z =
+ addto currentpicture contour makepath currentpen shifted z _op_
+enddef ;
+
+def unfill expr c = fill c withcolor background enddef ;
+def undraw expr p = draw p withcolor background enddef ;
+def unfilldraw expr c = filldraw c withcolor background enddef ;
+def undrawdot expr z = drawdot z withcolor background enddef ;
+
+def erase text t =
+ def _e_ =
+ withcolor background hide(def _e_ = enddef ;)
+ enddef ;
+ t _e_
+enddef;
+
+def _e_ = enddef ;
+
+def cutdraw text t =
+ begingroup
+ interim linecap := butt ;
+ draw t _e_ ;
+ endgroup
+enddef ;
+
+vardef image(text t) =
+ save currentpicture ;
+ picture currentpicture ;
+ currentpicture := nullpicture ;
+ t ;
+ currentpicture
+enddef;
+
+def pickup secondary q =
+ if numeric q :
+ numeric_pickup_
+ else :
+ pen_pickup_
+ fi q
+enddef ;
+
+def numeric_pickup_ primary q =
+ if unknown pen_[q] :
+ errmessage "Unknown pen" ;
+ clearpen
+ else :
+ currentpen := pen_ [q] ;
+ pen_lft := pen_lft_[q] ;
+ pen_rt := pen_rt_ [q] ;
+ pen_top := pen_top_[q] ;
+ pen_bot := pen_bot_[q] ;
+ currentpen_path := pen_path_[q]
+ fi ;
+enddef ;
+
+def pen_pickup_ primary q =
+ currentpen := q ;
+ pen_lft :=xpart penoffset down of currentpen ;
+ pen_rt :=xpart penoffset up of currentpen ;
+ pen_top :=ypart penoffset left of currentpen ;
+ pen_bot :=ypart penoffset right of currentpen ;
+ path currentpen_path ;
+enddef;
+
+newinternal pen_lft, pen_rt, pen_top, pen_bot, pen_count_ ;
+
+vardef savepen =
+ pen_[incr pen_count_] = currentpen ;
+ pen_lft_ [pen_count_] = pen_lft ;
+ pen_rt_ [pen_count_] = pen_rt ;
+ pen_top_ [pen_count_] = pen_top ;
+ pen_bot_ [pen_count_] = pen_bot ;
+ pen_path_[pen_count_] = currentpen_path ;
+ pen_count_
+enddef;
+
+def clearpen = currentpen:=nullpen;
+ pen_lft := pen_rt := pen_top := pen_bot := 0 ;
+ path currentpen_path ;
+enddef ;
+
+def clear_pen_memory =
+ pen_count_ := 0 ;
+ numeric pen_lft_[], pen_rt_[], pen_top_[], pen_bot_[] ;
+ pen currentpen, pen_[];
+ path currentpen_path, pen_path_[] ;
+enddef ;
+
+vardef lft primary x = x + if pair x: (pen_lft,0) else: pen_lft fi enddef ;
+vardef rt primary x = x + if pair x: (pen_rt,0) else: pen_rt fi enddef ;
+vardef top primary y = y + if pair y: (0,pen_top) else: pen_top fi enddef ;
+vardef bot primary y = y + if pair y: (0,pen_bot) else: pen_bot fi enddef ;
+
+vardef penpos@#(expr b,d) =
+ (x@#r-x@#l,y@#r-y@#l) = (b,0) rotated d ;
+ x@# = .5(x@#l+x@#r) ;
+ y@# = .5(y@#l+y@#r)
+enddef ;
+
+path path_.l, path_.r ;
+
+def penstroke text t =
+ forsuffixes e = l, r :
+ path_.e := t ;
+ endfor
+ fill path_.l -- reverse path_.r -- cycle
+enddef ;
+
+%% High level drawing commands
+
+newinternal ahlength, ahangle ;
+
+ahlength := 4 ; % default arrowhead length 4bp
+ahangle := 45 ; % default head angle 45 degrees
+
+vardef arrowhead expr p =
+ save q, e ; path q ; pair e ;
+ e = point length p of p ;
+ q = gobble(p shifted -e cutafter makepath(pencircle scaled 2ahlength)) cuttings ;
+ (q rotated .5ahangle & reverse q rotated -.5ahangle -- cycle) shifted e
+enddef;
+
+path _apth ;
+
+def drawarrow expr p = _apth := p ; _finarr enddef ;
+def drawdblarrow expr p = _apth := p ; _findarr enddef ;
+
+def _finarr text t =
+ draw _apth t ;
+ filldraw arrowhead _apth t
+enddef;
+
+def _findarr text t =
+ draw _apth t ;
+ fill arrowhead _apth withpen currentpen t ;
+ fill arrowhead reverse _apth withpen currentpen t ; % ; added HH
+enddef ;
+
+%% macros for labels
+
+newinternal bboxmargin ;
+
+bboxmargin := 2bp ; % this can bite you
+
+vardef bbox primary p =
+ llcorner p-( bboxmargin, bboxmargin)
+ -- lrcorner p+( bboxmargin,-bboxmargin)
+ -- urcorner p+( bboxmargin, bboxmargin)
+ -- ulcorner p+(-bboxmargin, bboxmargin)
+ -- cycle
+enddef ;
+
+string defaultfont ; newinternal defaultscale, labeloffset ;
+
+defaultfont := "cmr10" ;
+defaultscale := 1 ;
+labeloffset := 3bp ;
+
+vardef thelabel@#(expr s,z) = % Position s near z
+ save p ; picture p ;
+ if picture s :
+ p = s
+ else :
+ p = s infont defaultfont scaled defaultscale
+ fi ;
+ p shifted (z + labeloffset*laboff@# - ( labxf@#*lrcorner p + labyf@#*ulcorner p + (1-labxf@#-labyf@#)*llcorner p) )
+enddef;
+
+def label =
+ draw thelabel
+enddef ;
+
+newinternal dotlabeldiam ;
+
+dotlabeldiam := 3bp ;
+
+vardef dotlabel@#(expr s,z) text t_ =
+ label@#(s,z) t_ ;
+ % label@#(s,z) ;
+ interim linecap:=rounded ;
+ draw z withpen pencircle scaled dotlabeldiam t_ ;
+enddef ;
+
+def makelabel =
+ dotlabel
+enddef ;
+
+pair laboff, laboff.lft, laboff.rt, laboff.top, laboff.bot ;
+pair laboff.ulft, laboff.llft, laboff.urt, laboff.lrt ;
+
+laboff = (0,0) ; labxf = .5 ; labyf = .5 ;
+laboff.lft = (-1,0) ; labxf.lft = 1 ; labyf.lft = .5 ;
+laboff.rt = (1,0) ; labxf.rt = 0 ; labyf.rt = .5 ;
+laboff.bot = (0,-1) ; labxf.bot = .5 ; labyf.bot = 1 ;
+laboff.top = (0,1) ; labxf.top = .5 ; labyf.top = 0 ;
+laboff.ulft = (-.7,.7) ; labxf.ulft = 1 ; labyf.ulft = 0 ;
+laboff.urt = (.7,.7) ; labxf.urt = 0 ; labyf.urt = 0 ;
+laboff.llft = -(.7,.7) ; labxf.llft = 1 ; labyf.llft = 1 ;
+laboff.lrt = (.7,-.7) ; labxf.lrt = 0 ; labyf.lrt = 1 ;
+
+vardef labels@#(text t) =
+ forsuffixes $=t :
+ label@#(str$,z$) ;
+ endfor
+enddef ;
+
+vardef dotlabels@#(text t) =
+ forsuffixes $=t:
+ dotlabel@#(str$,z$) ;
+ endfor
+enddef ;
+
+vardef penlabels@#(text t) =
+ forsuffixes $$=l,,r :
+ forsuffixes $=t :
+ makelabel@#(str$.$$,z$.$$) ;
+ endfor
+ endfor
+enddef ;
+
+def range expr x =
+ numtok[x]
+enddef ;
+
+def numtok suffix x =
+ x
+enddef ;
+
+tertiarydef m thru n =
+ m for x=m+1 step 1 until n :
+ , numtok[x]
+ endfor
+enddef ;
+
+%% Overall adminstration
+
+string extra_beginfig, extra_endfig ;
+
+extra_beginfig := "" ;
+extra_endfig := "" ;
+
+def beginfig(expr c) =
+ begingroup
+ charcode := c ;
+ clearxy ;
+ clearit ;
+ clearpen ;
+ pickup defaultpen ;
+ drawoptions() ;
+ scantokens extra_beginfig ;
+enddef;
+
+def endfig =
+ ; % added by HH
+ scantokens extra_endfig ;
+ shipit ;
+ endgroup
+enddef;
+
+%% last-minute items
+
+vardef z@# =
+ (x@#,y@#)
+enddef ;
+
+def clearxy =
+ save x, y
+enddef ;
+
+def clearit =
+ currentpicture := nullpicture
+enddef ;
+
+def shipit =
+ shipout currentpicture
+enddef ;
+
+let bye = end ;
+outer end, bye ;
+
+clear_pen_memory ; % initialize the savepen mechanism
+clearit ;
+
+% set default line width
+
+newinternal defaultpen ;
+
+pickup pencircle scaled .5bp ;
+
+defaultpen := savepen ;