delimiters ();
smoothing:=1; autorounding:=2;  % this adjusts curves to the raster
turningcheck:=2;  % this will warn about a "strange path"

vardef z@# = (x@#,y@#) enddef;
vardef dz@# = (dx@#,dy@#) enddef;

picture currentpicture;
currentpicture=nullpicture; % this initializes an empty set of pixels

def fill expr c = addto currentpicture contour c enddef;
def shipit = shipout currentpicture enddef;
def showit = display currentpicture inwindow window enddef;

def unknown = not known enddef;

vardef pos@#(expr length,theta) =
  z@#=.5[z@#l,z@#r];
  z@#r-z@#l=(length,0) rotated theta enddef;
def stroke(suffix $,$$)(expr t,lt,rt) =
  fill z$l
   if known dz$: {dz$} fi
   if t<>0: ..lt[ t[z$l,z$$l],t[z$,z$$] ]{z$$l-z$l} fi
   .. z$$l
    if known dz$$: {dz$$} fi
  & z$$l..z$$r
  & z$$r
    if known dz$$: {-dz$$} fi
   if t<>0: ..rt[ t[z$r,z$$r],t[z$,z$$] ]{z$r-z$$r} fi
   .. z$r
   if known dz$: {-dz$} fi
  & z$r..z$l & cycle;
  showit; enddef;
def curve(suffix $,$$,$$$) =
  fill z$l
   if known dz$: {dz$} fi
  .. z$$l{if known dz$$: dz$$ else: z$$$l-z$l fi}
  .. z$$$l
   if known dz$$$: {dz$$$} fi
  & z$$$l..z$$$r
  & z$$$r
   if known dz$$$: {-dz$$$} fi
  .. z$$r{if known dz$$: -dz$$ else: z$r-z$$$r fi}
  .. z$r
   if known dz$: {-dz$} fi
  & z$r..z$l & cycle;
  showit; enddef;

def proofrule(expr a,b) =
  special "rule"; numspecial xpart a; numspecial ypart a;
  numspecial xpart b; numspecial ypart b enddef;
string lcode_;
lcode_=" 0"; % change to " /" to avoid listing in overflow column
def makelabel(expr s,z) = % puts string s at point z
  if known z: special lcode_ & s;
    numspecial xpart z; numspecial ypart z fi enddef;
def labelpos(text t) =
  if proofing>.5:
  forsuffixes $$=l,,r: forsuffixes $=t:
    makelabel(str $.$$, z$.$$); endfor endfor fi enddef;


def clear =
  numeric x[],y[],x[]l,y[]l,x[]r,y[]r,dx[],dy[];
  currentpicture:=nullpicture;
enddef;

def setwidth expr x =
  chardx:=x;
  numeric w; w=chardx;
  if proofing>.5:
  for n:=0 step .1em until chardx-1:
   proofrule((n,-ydepth),(n,hheight)); endfor
  proofrule((chardx,-ydepth),(chardx,hheight));
  proofrule((0,-ydepth),(chardx,-ydepth));
  proofrule((0,0),(chardx,0));
  proofrule((0,xheight),(chardx,xheight));
  proofrule((0,capheight),(chardx,capheight));
  proofrule((0,hheight),(chardx,hheight));
  fi
enddef;

vardef init.normal(expr f) =
  begingroup
  numeric thinwidth,thickwidth,capheight,xheight,hheight,ydepth,em;
  thinwidth = 11f; thickwidth = 15f; em = 200f;
  capheight = 130f; xheight = 90f; hheight = 140f; ydepth = 40f;
  endgroup
enddef;

vardef init.bold(expr f) =
  init.normal(f); thinwidth:= 14f; thickwidth:= 24f;
enddef;

vardef init.boldx(expr f) =
  init.bold(f); xheight:=95f; em:= 220f;
enddef;


vardef test@#(text #)=
  begingroup
  if str @# = "": % test all three
    openwindow 1 from (0,0) to (420,167) at (-20,310);
    openwindow 2 from (0,167) to (420,333) at (-20,310);
    openwindow 3 from (0,333) to (420,500) at (-20,310);
    window:=1; init.normal(1); clear; #; "normal"; shipit;
    window:=2; init.bold(1); clear; #; "bold"; shipit;
    window:=3; init.boldx(1); clear; #; "boldx"; shipit;
  else:  openwindow 0 from (0,0) to (420,500) at (-40,310);
    window:=0; init@#(2); clear; #; str @#; shipit;
  fi;
  endgroup
enddef;