%%BeginResource: procset LoutDiagPrependGraphic
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                    %
%  PostScript @SysPrependGraphic file for @Diag Jeffrey H. Kingston  %
%  Version 2.0 (includes CIRCUM label)                September 1996 %
%                                                                    %
%  This file has been placed in the public domain by its author,     %
%  Jeffrey H. Kingston                                               %
%                                                                    %
%  To assist in avoiding name clashes, the names of all symbols      %
%  defined here begin with "ldiag".  However, this is not feasible   %
%  with user-defined labels and some labels used by users.           %
%                                                                    %
%  <point>      is two numbers, a point.                             %
%  <length>     is one number, a length                              %
%  <angle>      is one number, an angle in degrees                   %
%  <dashlength> is one number, the preferred length of a dash        %
%                                                                    %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

errordict begin
   /handleerror
   {
      {  /Times-Roman findfont 8 pt scalefont setfont
	 0 setgray 4 pt 4 pt moveto
	 $error /errorname get
	 dup ldiagdict exch known
	 { ldiagdict exch get }
	 { 100 string cvs } ifelse
	 show
	 (  Command: ) show
	 $error /command get 100 string cvs show
      } stopped {} if
      showpage stop
   } def
end

% begin diagram: <maxlabels> ldiagbegin -
% must be defined outside ldiagdict since it loads it
/ldiagbegin
{ xsize 0 0 ysize ldiagdict begin
  5 -1 roll /ldiagmaxlabels exch def
  (@Diag) ldiagpushtagdict
  /OOY ldiagpointdef /OOX ldiagpointdef 0 0 /OOO ldiagpointdef
} def

% end diagram: - ldiagend -
/ldiagend
{ ldiagpoptagdict end
} def

% concat strings: <string> <string> ldiagconcat <string>
% must be defined outside ldiagdict since used in ldiagpromotelabels
/ldiagconcat
{ 2 copy length exch length add string
  dup 0 4 index putinterval
  dup 3 index length 3 index putinterval
  3 1 roll pop pop
} def

% mconcat strings: <string> <string> ldiagmconcat <string>
% returns concatenation, separated by @ if first is non-empty
% must be defined outside ldiagdict since used in ldiagpromotelabels
/ldiagmconcat
{
  2 copy length exch length add 1 add string
  dup 0 4 index putinterval
  dup 3 index length (@) putinterval
  dup 3 index length 1 add 3 index putinterval
  3 1 roll pop pop
} def

% show string in format start ... end: <string> ldiagsends <string>
/ldiagsends
{
  dup length 20 string cvs (: ) ldiagconcat exch
  dup 0 20 getinterval ( ... ) ldiagconcat
  3 -1 roll exch ldiagconcat
  exch dup length 20 sub 20 getinterval ldiagconcat
} def

/ldiagdebugposy 432 def
/ldiagdebugposx 72 def

% - ldiagdebugnextline -
/ldiagdebugnextline
{
  ldiagdebugposy 72 lt
  { /ldiagdebugposx ldiagdebugposx 144 add store
    /ldiagdebugposy 432 store
  }
  {
    /ldiagdebugposy ldiagdebugposy 12 sub store
  } ifelse
  ldiagdebugposx ldiagdebugposy moveto
} def

% - ldiagdebugbeginindent -
/ldiagdebugbeginindent
{
  /ldiagdebugposx ldiagdebugposx 12 add store
} def

% - ldiagdebugendindent -
/ldiagdebugendindent
{
  /ldiagdebugposx ldiagdebugposx 12 sub store
} def

% <string> <int> ldiagdebugprint -
% must be defined outside ldiagdict since used in arbitrary places
% print <string> plus count or <int> stack entries, whichever is the smaller
/ldiagdebugprint
{
  exch
  gsave
  initgraphics
  ldiagdebugnextline
  /Times-Roman findfont 10 scalefont setfont
  0 setgray show
  ldiagdebugbeginindent
  count 1 sub 2 copy lt { pop } { exch pop } ifelse 1 sub
  0 exch 1 exch
  {
    ldiagdebugnextline
    index
    dup type (dicttype) eq
    {
      (begin dict) show
      ldiagdebugbeginindent
      {
	ldiagdebugnextline
	pop 100 string cvs show
      } forall
      ldiagdebugendindent
      ldiagdebugnextline
      (end dict) show
    }
    {
      dup type (arraytype) eq
      {
        (begin array) show
        ldiagdebugbeginindent
	{
	  ldiagdebugnextline
	  100 string cvs show
	} forall
	ldiagdebugendindent
	ldiagdebugnextline
        (end array) show
      }
      {
        100 string cvs show
      } ifelse
    } ifelse
  } for
  ldiagdebugendindent
  grestore
} def

/ldiagdict 200 dict def
ldiagdict begin

% error messages
/dictfull (dictfull error:  too many labels?) def
/dictstackoverflow (dictstackoverflow error:  labels nested too deeply?) def
/execstackoverflow (execstackoverflow error:  figure nested too deeply?) def
/limitcheck (limitcheck error:  figure nested too deeply or too large?) def
/syntaxerror (syntaxerror error:  syntax error in text of figure?) def
/typecheck (typecheck error:  syntax error in text of figure?) def
/undefined (undefined error:  unknown or misspelt label?) def
/VMError (VMError error:  run out of memory?) def

% push pi onto stack:  - ldiagpi <num>
/ldiagpi 3.14159 def

% push e onto stack:  - ldiage <num>
/ldiage 2.71828 def

% arc directions
/clockwise     false def
/anticlockwise true  def

% test equality between two angles:  <angle> <angle> ldiagangleeq <bool>
/ldiagangleeq { ldiagfixangle exch ldiagfixangle eq } def

% test inequality between two angles:  <angle> <angle> ldiaganglene <bool>
/ldiaganglene { ldiagangleeq not } def

% maximum of two numbers:  <num> <num> ldiagmax <num>
/ldiagmax { 2 copy gt { pop } { exch pop } ifelse } def

% minimum of two numbers:  <num> <num> ldiagmin <num>
/ldiagmin { 2 copy lt { pop } { exch pop } ifelse } def

% add two points:  <point> <point> ldiagpadd <point>
/ldiagpadd
{
  % (Entering padd) 4 ldiagdebugprint
  exch 3 1 roll add 3 1 roll add exch
  % (Leaving padd) 2 ldiagdebugprint
} def

% subtract first point from second:  <point> <point> ldiagpsub <point>
/ldiagpsub { 3 2 roll sub 3 1 roll exch sub exch } def

% max two points:  <point> <point> ldiagpmax <point>
/ldiagpmax { exch 3 1 roll ldiagmax 3 1 roll ldiagmax exch } def

% min two points:  <point> <point> ldiagpmin <point>
/ldiagpmin { exch 3 1 roll ldiagmin 3 1 roll ldiagmin exch } def

% scalar multiplication: <point> <num> ldiagpmul <point>
/ldiagpmul { dup 3 1 roll mul 3 1 roll mul exch } def

% point at angle and distance:  <point> <length> <angle> ldiagatangle <point>
/ldiagatangle { 2 copy cos mul 3 1 roll sin mul ldiagpadd } def

% angle from one point to another:  <point> <point> ldiagangleto <angle>
/ldiagangleto { ldiagpsub 2 copy 0 eq exch 0 eq and {pop} {exch atan} ifelse } def

% distance between two points:  <point> <point> ldiagdistance <length>
/ldiagdistance { ldiagpsub dup mul exch dup mul add sqrt } def

% stroke a noline line:  <length> <dashlength> ldiagnoline -
/ldiagnoline
{ pop pop
} def

% stroke a solid line:  <length> <dashlength> ldiagsolid -
/ldiagsolid
{  pop pop [] 0 setdash 1 setlinecap stroke
} def

% stroke a dashed line:   <length> <dashlength> ldiagdashed -
/ldiagdashed
{  2 copy div 2 le 1 index 0 le or
   {  exch pop 1 pt ldiagmax [ exch dup ] 0 setdash }
   {  dup [ exch 4 2 roll 2 copy div
      1 sub 2 div ceiling dup 4 1 roll
      1 add mul sub exch div ] 0 setdash
   } ifelse 0 setlinecap stroke
} def

% stroke a cdashed line:  <length> <dashlength> ldiagcdashed -
/ldiagcdashed
{  % (Entering ldiagcdashed) 2 ldiagdebugprint
   2 copy le 1 index 0 le or
   { exch pop 1 pt ldiagmax [ exch dup ] dup 0 get 2 div setdash }
   { dup [ 4 2 roll exch 2 copy exch div
     2 div ceiling div 1 index sub
     ] exch 2 div setdash
   } ifelse 0 setlinecap stroke
   % (Leaving ldiagcdashed) 0 ldiagdebugprint
} def

% stroke a dotted line:  <length> <dashlength> ldiagdotted -
/ldiagdotted
{  2 copy le 1 index 0 le or
   { exch pop 1 pt ldiagmax [ exch 0 exch ] 0 setdash }
   { 1 index exch div ceiling div
     [ 0 3 2 roll ] 0 setdash
   } ifelse 1 setlinecap stroke
} def

% scale array elements by factor:  <array> <factor> ldiagscalearray <array>
/ldiagscalearray
{
  [ exch 3 2 roll
  { exch dup 3 1 roll mul exch } forall
  pop ]
} def

% sum array elements:  <array> ldiagsumarray <number>
/ldiagsumarray
{
  0 exch { add } forall
} def

% begin a more complex line: <length> <dashlength> ldiaglinebegin -
/ldiaglinebegin
{
  % (Entering ldiaglinebegin) 2 ldiagdebugprint
  20 dict begin
  /dashlen exch 1 pt ldiagmax def
  /len exch def
  /gap dashlen def
  /halfgap dashlen 2 div def
  /dash dashlen def
  /halfdash dashlen 2 div def
  /dot 0 def
  % (Leaving ldiaglinebegin) 0 ldiagdebugprint
} def

% end a more complex line: <linecap> <cycle> <startpos> <stoppos> ldiaglineend -
/ldiaglineend
{
  % (Entering ldiaglineend) 3 ldiagdebugprint
  /stoppos exch def
  /startpos exch def
  /cycle exch def
  /linecap exch def
  /stopposlen stoppos ldiagsumarray def
  /startposlen startpos ldiagsumarray def
  /cyclelen cycle ldiagsumarray def
  /effectivelen len startposlen add stopposlen sub def
  effectivelen 0 gt cyclelen 0 gt and
  {
    /repeats effectivelen cyclelen div ceiling def
    /factor len repeats cyclelen mul startposlen sub stopposlen add div def
    cycle factor ldiagscalearray startposlen factor mul setdash
    linecap setlinecap stroke
  } if
  end
  % (Leaving ldiaglineend) 0 ldiagdebugprint
} def

% stroke a dotdashed line: <length> <dashlength> ldiagdotdashed -
/ldiagdotdashed
{
  ldiaglinebegin
  1 [dash gap dot gap] [] [dash]
  ldiaglineend
} def

% stroke a dotcdashed line: <length> <dashlength> ldiagdotcdashed -
/ldiagdotcdashed
{
  ldiaglinebegin
  1 [dash gap dot gap] [halfdash] [halfdash]
  ldiaglineend
} def

% stroke a dotdotdashed line: <length> <dashlength> ldiagdotdotdashed -
/ldiagdotdotdashed
{
  ldiaglinebegin
  1 [dash gap dot gap dot gap] [] [dash]
  ldiaglineend
} def

% stroke a dotdotcdashed line: <length> <dashlength> ldiagdotdotcdashed -
/ldiagdotdotcdashed
{
  ldiaglinebegin
  1 [dash gap dot gap dot gap] [halfdash] [halfdash]
  ldiaglineend
} def

% stroke a dotdotdotdashed line: <length> <dashlength> ldiagdotdotdotdashed -
/ldiagdotdotdotdashed
{
  ldiaglinebegin
  1 [dash gap dot gap dot gap dot gap] [] [dash]
  ldiaglineend
} def

% stroke a dotdotdotcdashed line: <length> <dashlength> ldiagdotdotdotcdashed -
/ldiagdotdotdotcdashed
{
  ldiaglinebegin
  1 [dash gap dot gap dot gap dot gap] [halfdash] [halfdash]
  ldiaglineend
} def

% shape and labels of the @Box symbol
% ldiagbox <shape>
/ldiagbox
{
   0     0         /SW  ldiagpointdef
   xsize 0         /SE  ldiagpointdef
   xsize ysize     /NE  ldiagpointdef
   0     ysize     /NW  ldiagpointdef

   xsize 0.25 mul ysize /NNW ldiagpointdef
   xsize 0.75 mul ysize /NNE ldiagpointdef
   xsize 0.25 mul     0 /SSW ldiagpointdef
   xsize 0.75 mul     0 /SSE ldiagpointdef

   SE 0.5 ldiagpmul /S   ldiagpointdef
   NW 0.5 ldiagpmul /W   ldiagpointdef
   W SE ldiagpadd   /E   ldiagpointdef
   S NW ldiagpadd   /N   ldiagpointdef

   NE 0.5 ldiagpmul /CTR ldiagpointdef

     0 dg /SSW@ANGLE  ldiagangledef
     0 dg /S@ANGLE    ldiagangledef
     0 dg /SSE@ANGLE  ldiagangledef
    45 dg /SE@ANGLE   ldiagangledef
    90 dg /E@ANGLE    ldiagangledef
   135 dg /NE@ANGLE   ldiagangledef
   180 dg /NNE@ANGLE  ldiagangledef
   180 dg /N@ANGLE    ldiagangledef
   180 dg /NNW@ANGLE  ldiagangledef
   225 dg /NW@ANGLE   ldiagangledef
   270 dg /W@ANGLE    ldiagangledef
   315 dg /SW@ANGLE   ldiagangledef

   [ CTR NE ldiagpsub /ldiagboxcircum cvx ] ldiagcircumdef
   SW SE NE NW SW
} def

% shape and labels of the @CurveBox symbol
% <margin> ldiagcurvebox <shape>
/ldiagcurvebox
{  

   % (Entering ldiagcurvebox) 1 ldiagdebugprint
   ldiagdecodelength /cbmgn exch def

   xsize 0.5 mul	ysize 0.5 mul	/CTR ldiagpointdef
   xsize 0.5 mul	0		/S   ldiagpointdef
   xsize		ysize 0.5 mul	/E   ldiagpointdef
   xsize 0.5 mul	ysize		/N   ldiagpointdef
   0			ysize 0.5 mul	/W   ldiagpointdef

   cbmgn 0.293 mul		cbmgn 0.293 mul		  /SW  ldiagpointdef
   xsize cbmgn 0.293 mul sub	cbmgn 0.293 mul		  /SE  ldiagpointdef
   xsize cbmgn 0.293 mul sub	ysize cbmgn 0.293 mul sub /NE  ldiagpointdef
   cbmgn 0.293 mul		ysize cbmgn 0.293 mul sub /NW  ldiagpointdef

     0 dg /S@ANGLE  ldiagangledef
    45 dg /SE@ANGLE ldiagangledef
    90 dg /E@ANGLE  ldiagangledef
   135 dg /NE@ANGLE ldiagangledef
   180 dg /N@ANGLE  ldiagangledef
   225 dg /NW@ANGLE ldiagangledef
   270 dg /W@ANGLE  ldiagangledef
   315 dg /SW@ANGLE ldiagangledef

   [ xsize ysize 0.5 ldiagpmul cbmgn /ldiagcurveboxcircum cvx ] ldiagcircumdef

   cbmgn		0
   xsize cbmgn sub	0
   [ xsize cbmgn sub	cbmgn		]
   xsize		cbmgn
   xsize		ysize cbmgn sub
   [ xsize cbmgn sub	ysize cbmgn sub	]
   xsize cbmgn sub	ysize
   cbmgn		ysize
   [ cbmgn		ysize cbmgn sub	]
   0			ysize cbmgn sub
   0			cbmgn
   [ cbmgn		cbmgn		]
   cbmgn		0

   % (Leaving ldiagcurvebox) 0 ldiagdebugprint
} def

% shadow of the @ShadowBox symbol
% its shape and labels are done, somewhat inaccurately, with ldiagbox
% <shadowmargin> ldiagshadow -
/ldiagshadow
{ 
  /lfshm exch def
  
  lfshm 0 moveto
  0 lfshm neg rlineto
  xsize 0 rlineto
  0 ysize rlineto
  lfshm neg 0 rlineto
  xsize 0 lineto
  closepath fill

} def

% shape and labels of the @Square symbol
/ldiagsquare
{
   xsize ysize 0.5 ldiagpmul /CTR ldiagpointdef
   CTR xsize xsize ysize ysize ldiagpmax 0.5 ldiagpmul ldiagpadd /NE ldiagpointdef
   CTR 0 0 CTR NE ldiagdistance 135 ldiagatangle ldiagpadd /NW ldiagpointdef
   CTR 0 0 CTR NE ldiagdistance 225 ldiagatangle ldiagpadd /SW ldiagpointdef
   CTR 0 0 CTR NE ldiagdistance 315 ldiagatangle ldiagpadd /SE ldiagpointdef
   SW 0.5 ldiagpmul SE 0.5 ldiagpmul ldiagpadd /S ldiagpointdef
   NW 0.5 ldiagpmul NE 0.5 ldiagpmul ldiagpadd /N ldiagpointdef
   SW 0.5 ldiagpmul NW 0.5 ldiagpmul ldiagpadd /W ldiagpointdef
   SE 0.5 ldiagpmul NE 0.5 ldiagpmul ldiagpadd /E ldiagpointdef

     0 dg /S@ANGLE  ldiagangledef
    45 dg /SE@ANGLE ldiagangledef
    90 dg /E@ANGLE  ldiagangledef
   135 dg /NE@ANGLE ldiagangledef
   180 dg /N@ANGLE  ldiagangledef
   225 dg /NW@ANGLE ldiagangledef
   270 dg /W@ANGLE  ldiagangledef
   315 dg /SW@ANGLE ldiagangledef

   [ CTR NE ldiagpsub /ldiagboxcircum cvx ] ldiagcircumdef
   SW SE NE NW SW
} def

% shape and labels of the @Diamond symbol
/ldiagdiamond
{
   xsize 0 0.5 ldiagpmul /S   ldiagpointdef
   0 ysize 0.5 ldiagpmul /W   ldiagpointdef
   S W         ldiagpadd /CTR ldiagpointdef
   CTR W       ldiagpadd /N   ldiagpointdef
   CTR S       ldiagpadd /E   ldiagpointdef
   E N ldiagpadd 0.5 ldiagpmul /NE ldiagpointdef
   N W ldiagpadd 0.5 ldiagpmul /NW ldiagpointdef
   S W ldiagpadd 0.5 ldiagpmul /SW ldiagpointdef
   S E ldiagpadd 0.5 ldiagpmul /SE ldiagpointdef

     0 dg        /S@ANGLE  ldiagangledef
    90 dg        /E@ANGLE  ldiagangledef
   180 dg        /N@ANGLE  ldiagangledef
   270 dg        /W@ANGLE  ldiagangledef
   S E ldiagangleto /SE@ANGLE ldiagangledef
   E N ldiagangleto /NE@ANGLE ldiagangledef
   N W ldiagangleto /NW@ANGLE ldiagangledef
   W S ldiagangleto /SW@ANGLE ldiagangledef

   [ xsize ysize 0.5 ldiagpmul /ldiagdiamondcircum cvx ] ldiagcircumdef
   S E N W S
} def

% shape and labels of the @Ellipse symbol
/ldiagellipse
{
   xsize 0 0.5 ldiagpmul /S   ldiagpointdef
   0 ysize 0.5 ldiagpmul /W   ldiagpointdef
   S W         ldiagpadd /CTR ldiagpointdef
   CTR W       ldiagpadd /N   ldiagpointdef
   CTR S       ldiagpadd /E   ldiagpointdef
   CTR xsize 0 0.3536 ldiagpmul ldiagpadd 0 ysize 0.3536 ldiagpmul ldiagpadd /NE ldiagpointdef
   0 ysize 0.3536 ldiagpmul CTR xsize 0 0.3536 ldiagpmul ldiagpadd ldiagpsub /SE ldiagpointdef
   xsize 0 0.3536 ldiagpmul CTR ldiagpsub 0 ysize 0.3536 ldiagpmul ldiagpadd /NW ldiagpointdef
   0 ysize 0.3536 ldiagpmul xsize 0 0.3536 ldiagpmul CTR ldiagpsub ldiagpsub /SW ldiagpointdef
   [ xsize ysize 0.5 ldiagpmul /ldiagellipsecircum cvx ] ldiagcircumdef

     0 dg /S@ANGLE  ldiagangledef
    90 dg /E@ANGLE  ldiagangledef
   180 dg /N@ANGLE  ldiagangledef
   270 dg /W@ANGLE  ldiagangledef

   S E ldiagangleto /SE@ANGLE ldiagangledef
   E N ldiagangleto /NE@ANGLE ldiagangledef
   N W ldiagangleto /NW@ANGLE ldiagangledef
   W S ldiagangleto /SW@ANGLE ldiagangledef

   S [ CTR ] E [ CTR ] N [ CTR ] W [ CTR ] S
} def

% shape and labels of the @Circle symbol
/ldiagcircle
{
   xsize ysize 0.5 ldiagpmul /CTR ldiagpointdef
   CTR xsize 0 ysize 0 ldiagpmax 0.5 ldiagpmul ldiagpadd /E ldiagpointdef
   CTR 0 0 CTR E ldiagdistance 45 ldiagatangle ldiagpadd /NE ldiagpointdef
   CTR 0 0 CTR E ldiagdistance 90 ldiagatangle ldiagpadd /N ldiagpointdef
   CTR 0 0 CTR E ldiagdistance 135 ldiagatangle ldiagpadd /NW ldiagpointdef
   CTR 0 0 CTR E ldiagdistance 180 ldiagatangle ldiagpadd /W ldiagpointdef
   CTR 0 0 CTR E ldiagdistance 225 ldiagatangle ldiagpadd /SW ldiagpointdef
   CTR 0 0 CTR E ldiagdistance 270 ldiagatangle ldiagpadd /S ldiagpointdef
   CTR 0 0 CTR E ldiagdistance 315 ldiagatangle ldiagpadd /SE ldiagpointdef
   [ S E ldiagpsub /ldiagellipsecircum cvx ] ldiagcircumdef

     0 dg /S@ANGLE  ldiagangledef
    45 dg /SE@ANGLE ldiagangledef
    90 dg /E@ANGLE  ldiagangledef
   135 dg /NE@ANGLE ldiagangledef
   180 dg /N@ANGLE  ldiagangledef
   225 dg /NW@ANGLE ldiagangledef
   270 dg /W@ANGLE  ldiagangledef
   315 dg /SW@ANGLE ldiagangledef

   S [ CTR ] E [ CTR ] N [ CTR ] W [ CTR ] S
} def

% shape and labels of the @VLine and @VArrow symbols
/ldiagvline
{
   xmark ysize ldiagprevious /FROM ldiagpointdef
   xmark 0 ldiagprevious /TO ldiagpointdef
} def

% points of a polygon around base with given no of sides, vert init angle:
% <sides> <angle> ldiagpolygon <point> ... <point>
/ldiagpolygon
{  exch round cvi exch
   xsize ysize 0.5 ldiagpmul /CTR ldiagpointdef
   90 sub CTR 2 copy ldiagmax 5 3 roll
   [ 4 copy pop /ldiagpolycircum cvx ] ldiagcircumdef
   exch dup 360 exch div exch
   1 1  3 2 roll
   {  4 string cvs (P) exch ldiagconcat
      3 copy exch pop (@ANGLE) ldiagconcat cvn exch 90 add exch ldiagangledef
      cvn 6 copy pop pop ldiagatangle 2 copy 10 2 roll
      3 2 roll ldiagpointdef
      dup 3 1 roll add exch
   }  for
   pop ldiagatangle
} def

% shape and labels of the @Isosceles triangle symbol
/ldiagisosceles
{
   xsize ysize 0.5 ldiagpmul /CTR ldiagpointdef
   0     0                   /SW  ldiagpointdef
   xsize 0                   /SE  ldiagpointdef
   xsize 0.5 mul ysize       /N   ldiagpointdef
   xsize 0.5 mul 0           /S   ldiagpointdef
   SE 0.5 ldiagpmul N 0.5 ldiagpmul ldiagpadd /NE ldiagpointdef
   SW 0.5 ldiagpmul N 0.5 ldiagpmul ldiagpadd /NW ldiagpointdef

   [ xsize ysize /ldiagisoscelescircum cvx ] ldiagcircumdef

     0 dg              /SW@ANGLE ldiagangledef
     0 dg              /SE@ANGLE ldiagangledef
   180 dg              /N@ANGLE  ldiagangledef
     0 dg              /S@ANGLE  ldiagangledef
     SE N ldiagangleto /NE@ANGLE ldiagangledef
     N SW ldiagangleto /NW@ANGLE ldiagangledef

   SW SE N SW
} def

% next array element:  <array> <index> ldiaggetnext <array> <index> <any> true
%                                               or <array> <index> false
/ldiaggetnext
{  2 copy exch length ge
   { false }
   { 2 copy get exch 1 add exch true } ifelse
} def

% check whether thing is number:  <any> ldiagisnumbertype <any> <bool>
/ldiagisnumbertype
{  dup type dup
   /integertype eq exch /realtype eq or
} def

% check whether thing is an array:  <any> ldiagisarraytype <any> <bool>
/ldiagisarraytype { dup type /arraytype eq } def

% check whether thing is an array:  <any> ldiagisnametype <any> <bool>
/ldiagisnametype { dup type /nametype eq } def

% get next item:  <array> <index> ldiaggetnextitem <array> <index> 0
%                                              or <array> <index> <array> 1
%                                              or <array> <index> <point> 2
/ldiaggetnextitem
{   ldiaggetnext
    {	ldiagisarraytype
	{   1
	}
	{   ldiagisnumbertype
	    {	3 1 roll
		ldiaggetnext
		{   ldiagisnumbertype
		    {	4 3 roll exch  2
		    }
		    {	pop 3 2 roll pop  0
		    } ifelse
		}
		{   3 2 roll pop  0
		} ifelse
	    }
	    {	pop 0
	    } ifelse
	} ifelse
    }
    {	0
    } ifelse
} def

% approximate equality: num1 num2  approxeq  <boolean>
/approxeq
{ dup 0 eq
  { pop 0 eq
  }
  { dup 3 1 roll sub exch div abs 0.001 lt
  } ifelse
} def

% set arc path:  bool x1 y1  x2 y2  x0 y0  ldiagsetarc  <angle> <angle> <dist>
% the path goes from x1 y1 to x2 y2 about centre x0 y0,
% anticlockwise if bool is true else clockwise.
% The orientations of backwards pointing and forwards pointing
% arrowheads are returned in the two angles, and
% the length of the arc is returned in <dist>.
/ldiagsetarc
{
  % (Entering ldiagsetarc) 7 ldiagdebugprint
  20 dict begin
     matrix currentmatrix 8 1 roll
     2 copy translate 2 copy 8 2 roll
     4 2 roll ldiagpsub 6 2 roll ldiagpsub
     dup /y1 exch def dup mul /y1s exch def
     dup /x1 exch def dup mul /x1s exch def
     dup /y2 exch def dup mul /y2s exch def
     dup /x2 exch def dup mul /x2s exch def
     /dist1 0 0 x1 y1 ldiagdistance def
     /dist2 0 0 x2 y2 ldiagdistance def

     y1s y2s approxeq
     {	-1
     }
     {	y1s x2s mul y2s x1s mul sub y1s y2s sub div
     } ifelse
     /da exch def

     x1s x2s approxeq
     {	-1
     }
     {	x1s y2s mul x2s y1s mul sub x1s x2s sub div
     } ifelse
     /db exch def

     da 0 gt db 0 gt and
     {
	% (  case 1, ellipse) 0 ldiagdebugprint
	/LMax da sqrt db sqrt ldiagmax def
	/scalex da sqrt LMax div def
	/scaley db sqrt LMax div def
	scalex scaley scale
	0 0 LMax
	0 0 x1 scalex mul y1 scaley mul ldiagangleto
	0 0 x2 scalex mul y2 scaley mul ldiagangleto
	2 copy eq { 360 add } if
	2 copy 8 2 roll
	5 index { arc } { arcn } ifelse
	2 index 1 index
	{ 90 sub } { 90 add } ifelse
	dup sin scaley mul exch cos scalex mul atan
	2 index 2 index
	{ 90 add } { 90 sub } ifelse
	dup sin scaley mul exch cos scalex mul atan
	5 2 roll  % res1 res2 ang1 ang2 anticlockwise
	{ exch sub } { sub } ifelse
	dup 0 le { 360 add } if  ldiagpi mul LMax mul 180 div
     }
     {
	dist1 dist2 approxeq
	% x1 y1 dist1 (  x1 y1, d) 3 ldiagdebugprint pop pop pop
	% x2 y2 dist2 (  x2 y2, d) 3 ldiagdebugprint pop pop pop
	{
		% (  case 2, circle) 0 ldiagdebugprint
		0 0
		dist1
		0 0 x1 y1 ldiagangleto
		0 0 x2 y2 ldiagangleto
		2 copy eq { 360 add } if
		2 copy 8 2 roll
		5 index { arc } { arcn } ifelse
		2 index 1 index
		{ 90 sub } { 90 add } ifelse
		2 index 2 index
		{ 90 add } { 90 sub } ifelse
		5 2 roll % res1 res2 ang1 ang2 clockwise
		{ exch sub } { sub } ifelse
		dup 0 le { 360 add } if
		ldiagpi mul dist1 mul 180 div
	}
	{
		% (  case 3, line) 0 ldiagdebugprint
		x2 y2 lineto pop
		x2 y2 x1 y1 ldiagangleto
		x1 y1 x2 y2 ldiagangleto
		x1 y1 x2 y2 ldiagdistance
	} ifelse
     } ifelse
     4 -1 roll setmatrix
     end
  % (Leaving ldiagsetarc) 3 ldiagdebugprint
} def

% ldiagsetcurve: set up a Bezier curve from x0 y0 to x3 y3
% and return arrowhead angles and length of curve (actually 0)
% x0 y0 x1 y1 x2 y2 x3 y3 ldiagsetcurve <angle> <angle> <length>
/ldiagsetcurve
{ 8 copy curveto pop pop
  ldiagangleto
  5 1 roll
  4 2 roll ldiagangleto
  exch
  0
} def

% ldiagsetpath: convert a Diag path into a PostScript path
% [ shape ] ldiagsetpath -
/ldiagsetpath
{
  10 dict begin
    0 newpath
    /prevseen false def
    /curveseen false def
    { ldiaggetnextitem
      dup 0 eq { pop exit }
      { 1 eq
        { /curveseen true def
	  /curve exch def
	  curve length 0 eq { /curveseen false def } if
        }
        { /ycurr exch def
	  /xcurr exch def
	  prevseen
	  { curveseen
	    { curve length 4 eq
	      { xprev yprev
		curve 0 get curve 1 get
		curve 2 get curve 3 get
		xcurr ycurr
		ldiagsetcurve pop pop pop
	      }
	      { xprev yprev xcurr ycurr
	        curve length 1 ge { curve 0 get } { 0 } ifelse
	        curve length 2 ge { curve 1 get } { 0 } ifelse
	        curve length 3 ge { curve 2 get } { true } ifelse
	        7 1 roll
	        ldiagsetarc pop pop pop
	      } ifelse
	    }
	    { xcurr ycurr lineto
	    } ifelse
	  }
	  { xcurr ycurr moveto
	  } ifelse
	  /xprev xcurr def
	  /yprev ycurr def
	  /prevseen true def
	  /curveseen false def
        } ifelse
      } ifelse
    } loop pop pop
  end
} def

% ldiagpaintpath: paint a path of the given shape
% /paint [ shape ] ldiagpaintpath -
/ldiagpaintpath
{
  ldiagsetpath cvx exec
} def

% stroke a path of the given shape in the given linestyle and dash length.
% Return the origin and angle of the backward and forward arrow heads.
% dashlength /linestyle [shape] ldiagdopath  [<point> <angle>] [<point> <angle>] 
/ldiagdopath
{
  10 dict begin
    0
    /prevseen  false def
    /curveseen false def
    /backarrow []    def
    /fwdarrow  []    def
    {
	ldiaggetnextitem
	dup 0 eq { pop exit }
	{
	    1 eq
	    {	/curveseen true def
		/curve exch def
		curve length 0 eq { /prevseen false def } if
	    }
	    {	/ycurr exch def
		/xcurr exch def
		prevseen
		{   newpath xprev yprev moveto
		    curveseen
		    {	curve length 4 eq
			{   xprev yprev
			    curve 0 get curve 1 get
			    curve 2 get curve 3 get
			    xcurr ycurr ldiagsetcurve
			}
			{   xprev yprev xcurr ycurr
			    curve length 1 ge { curve 0 get } { 0 } ifelse
			    curve length 2 ge { curve 1 get } { 0 } ifelse
			    curve length 3 ge { curve 2 get } { true } ifelse
			    7 1 roll
			    ldiagsetarc
			} ifelse
		    }
		    {	xcurr ycurr lineto
			xcurr ycurr xprev yprev ldiagangleto dup 180 sub
			xprev yprev xcurr ycurr ldiagdistance
		    } ifelse
		    6 index 6 index cvx exec
		    [ xprev yprev 5 -1 roll ]
		    backarrow length 0 eq
		    { /backarrow exch def }
		    { pop } ifelse
		    [ xcurr ycurr 4 -1 roll ] /fwdarrow exch def
		} if
		/xprev xcurr def
		/yprev ycurr def
		/prevseen true def
		/curveseen false def
	    } ifelse
	} ifelse
    } loop
    pop pop pop pop
    backarrow length 0 eq { [ 0 0 0 ] } { backarrow } ifelse
    fwdarrow  length 0 eq { [ 0 0 0 ] } { fwdarrow  } ifelse
  end
} def


% stroke a path of the given shape in the given linestyle and dash length.
% dashlength [ /linestyle ] [shape] ldiagdosegpath  -
/ldiagdosegpath
{
  12 dict begin
    1 index /seg exch def
    1 index length /seglength exch def
    0 /segcount exch def
    0
    /prevseen  false def
    /curveseen false def
    /backarrow []    def
    /fwdarrow  []    def
    {
	ldiaggetnextitem
	dup 0 eq { pop exit }
	{
	    1 eq
	    {	/curveseen true def
		/curve exch def
		curve length 0 eq { /prevseen false def } if
	    }
	    {	/ycurr exch def
		/xcurr exch def
		prevseen
		{   newpath xprev yprev moveto
		    curveseen
		    {	curve length 4 eq
			{   xprev yprev
			    curve 0 get curve 1 get
			    curve 2 get curve 3 get
			    xcurr ycurr ldiagsetcurve
			}
			{   xprev yprev xcurr ycurr
			    curve length 1 ge { curve 0 get } { 0 } ifelse
			    curve length 2 ge { curve 1 get } { 0 } ifelse
			    curve length 3 ge { curve 2 get } { true } ifelse
			    7 1 roll
			    ldiagsetarc
			} ifelse
		    }
		    {	xcurr ycurr lineto
			xcurr ycurr xprev yprev ldiagangleto dup 180 sub
			xprev yprev xcurr ycurr ldiagdistance
		    } ifelse
		    6 index seg segcount seglength mod get cvx exec
		    /segcount segcount 1 add def
		    [ xprev yprev 5 -1 roll ]
		    backarrow length 0 eq
		    { /backarrow exch def }
		    { pop } ifelse
		    [ xcurr ycurr 4 -1 roll ] /fwdarrow exch def
		} if
		/xprev xcurr def
		/yprev ycurr def
		/prevseen true def
		/curveseen false def
	    } ifelse
	} ifelse
    } loop
    pop pop pop pop
  end
} def

% ldiagnodebegin: start of node parameters
% ldiagnodebegin -
/ldiagnodebegin
{ % (Entering ldiagnodebegin) 0 ldiagdebugprint
  ldiagmaxlabels dict begin 
} def

% ldiagnodeend: end of node parameters (so do the node)
% <outline> <dashlength> <style> <linewidth> <colour> <paint> ldiagnodeend -
/ldiagnodeend
{
  % (Entering ldiagnodeend) 0 ldiagdebugprint
  end % matches begin in ldiagnodebegin
  5 index gsave ldiagpaintpath grestore         % <outline> <dl> <st> <lw> <cl>
  4 index ldiagsetpath clip newpath             % <outline> <dl> <st> <lw> <cl>
  exec						% <outline> <dl> <st> <lw>
  2 mul setlinewidth                            % <outline> <dl> <st>
  3 -1 roll                                     % <dashlength> <st> <outline>
  ldiagdosegpath                                % -
  % (Leaving ldiagnodeend) 0 ldiagdebugprint
} def

% ldiaglinkbegin: start of link parameters
% <direct> ldiaglinkbegin -
/ldiaglinkbegin
{ ldiagmaxlabels dict begin 
  1 eq /direct exch def
} def

% ldiaglinkend: end of link parameters (so do the link)
% <outline> <dashlength> <style> <linewidth> ldiaglinkend -
/ldiaglinkend
{
  end % matches begin in ldiaglinkbegin
  setlinewidth
  3 -1 roll ldiagdosegpath
} def

% ldiagdoarrow: draw an arrow head of given form
% dashlength /lstyle /pstyle hfrac height width [ <point> <angle> ] ldiagdoarrow -
/ldiagdoarrow
{  matrix currentmatrix 8 1 roll
   dup 0 get 1 index 1 get translate
   2 get rotate
   [ 2 index neg 2 index 0 0
     3 index 3 index neg
     1 index 10 index mul 0
     7 index 7 index ]
   4 1 roll pop pop pop
   dup 3 1 roll
   gsave ldiagpaintpath grestore ldiagdopath pop pop
   setmatrix
} def

% arrow head styles (unused)
% /ldiagopen     0.0 def
% /ldiaghalfopen 0.5 def
% /ldiagclosed   1.0 def

% stroke no arrows, forward, back, and both
/ldiagnoarrow { pop pop pop pop pop pop pop pop                        } def
/ldiagforward { 7 -1 roll ldiagdoarrow pop                              } def
/ldiagback    { 8 -2 roll pop ldiagdoarrow                              } def
/ldiagboth    { 8 -1 roll 7 copy ldiagdoarrow pop 7 -1 roll ldiagdoarrow } def

% ldiagprevious: return previous point on path
/ldiagprevious
{ ldiagisnumbertype
  { 2 copy }
  { ldiagisarraytype
    { 2 index 2 index }
    { 0 0 }
    ifelse
  } ifelse
} def

% Tag dictionary operators
%
% Diag's tag dictionaries are kept on the same stack as other dictionaries,
% since there is nowhere else to put them.  However, they are managed like
% a separate stack using the following operators:
%
%  <tag>  ldiagpushtagdict  -      Push a new, empty tag dictionary
%         ldiagtoptagdict   dict   Find the top tag dictionary
%         ldiagpoptagdict   -      Pop and destroy the top tag dictionary
%         ldiagpopuptagdict -      Pop top tag dict and promote its entries
% <array> ldiagpopsometagdict -    Like popuptagdict but only those promote
%                                  those labels listed in <array>
%         ldiagdebugtagdict -      Debug print of dictionary stack
%
% They are distinguished from other dictionaries by containing /ldiagtagdict,
% whose value is the <tag> which is used by ldiagpopuptagdict,
% and they are hopefully never the target of any non-tag definition because
% they are never the top dictionary, since push places the new dict second.

/ldiagpushtagdict
{ ldiagmaxlabels dict dup
  currentdict end exch begin begin
  exch /ldiagtagdict exch put
} def

/ldiagtoptagdict
{ /ldiagtagdict where not
  { (Diag internal error: no tag dictionary) show stop
  } if
} def

/ldiagpoptagdict
{
  % (Entering poptagdict) 0 ldiagdebugprint
  % ldiagdebugtagdict
  mark
  { currentdict end
    dup /ldiagtagdict known
    { exit
    } if
  } loop
  pop
  counttomark
  { begin
  } repeat
  pop
  % (Leaving poptagdict) 0 ldiagdebugprint
  % ldiagdebugtagdict
} def

% promote labels from top tag dictionary to second top tag dictionary
% each prefixed by <string>@ if <string> (value of /ldiagtagdict) is not empty
% - ldiagpopuptagdict -
/ldiagpopuptagdict
{
  ldiagtagdict
  % (Entering ldiagpopuptagdict) 1 ldiagdebugprint
  % ldiagdebugtagdict
  ldiagtoptagdict ldiagpoptagdict ldiagtoptagdict exch
  { exch dup length string cvs
    3 index exch ldiagmconcat
    cvn exch 2 index 3 1 roll put
  } forall
  pop pop
  % (Leaving ldiagpopuptagdict) 0 ldiagdebugprint
  % ldiagdebugtagdict
} def

% similar to ldiagpopuptagdict but only those inner labels that are
% present in <array> will be promoted
% <array> ldiagpopsometagdict -
/ldiagpopsometagdict
{
  ldiagtagdict
  % (Entering ldiagpopsometagdict) 1 ldiagdebugprint
  % ldiagdebugtagdict
  ldiagtoptagdict
  ldiagpoptagdict
  ldiagtoptagdict
  4 -1 roll
  { dup 3 index exch
    get
    exch 4 index
    exch ldiagmconcat exch
    3 copy put
    pop pop
  } forall
  pop pop pop
  % (Leaving ldiagpopuptagdict) 0 ldiagdebugprint
  % ldiagdebugtagdict
} def

% debug tag dictionary stack
/ldiagdebugtagdict
{ (Entering ldiagdebugtagdict) 0 ldiagdebugprint
  30 array dictstack
  { dup /ldiagtagdict known
    { dup /ldiagtagdict get 0 ldiagdebugprint
      { pop 100 string cvs (   ) exch ldiagconcat
	dup 0 ldiagdebugprint
	pop
      }
      forall
    }
    { pop (other) 0 ldiagdebugprint
    } ifelse
  } forall
  (Leaving ldiagdebugtagdict) 0 ldiagdebugprint
} def

% label a point in top tag dictionary:  <point> /name ldiagpointdef -
/ldiagpointdef
{
  % (Entering ldiagpointdef) 3 ldiagdebugprint
  [ 4 2 roll transform /itransform cvx ] cvx
  ldiagtoptagdict 3 1 roll put
  % (Leaving ldiagpointdef) 0 ldiagdebugprint
} def

% label an angle in top tag dictionary:  <angle> /name ldiagangledef -
/ldiagangledef
{
  % (Entering ldiagangledef) 2 ldiagdebugprint
  exch ldiagfixangle ldiagtoptagdict 3 1 roll put
  % (Leaving ldiagangledef) 0 ldiagdebugprint
} def

% add CIRCUM operator with this body:  <array> ldiagcircumdef -
/ldiagcircumdef
{   % (Entering ldiagcircumdef) 1 ldiagdebugprint
    /CIRCUM exch cvx
    ldiagtoptagdict 3 1 roll put
    % currentdict end
    % 3 1 roll
    % def
    % begin
    % (Leaving ldiagcircumdef) 0 ldiagdebugprint
} def

% show points (except CIRCUM and ANGLE): - ldiagshowpoints -
/ldiagshowpoints
{
  % (Entering ldiagshowpoints) 0 ldiagdebugprint
  ldiagtoptagdict
  { 1 index 100 string cvs
    (ldiagdebugpos) search
    { pop pop pop pop pop }
    {
      (CIRCUM) search % if CIRCUM in key
      { pop pop pop pop pop }
      { 
        (ANGLE) search % if ANGLE in key
        {
          pop pop pop pop pop
        }
        {
          (ldiagtagdict) search
          {
            pop pop pop pop pop
          }
          {
	    pop cvx exec
	    newpath 2.0 pt 0 360 arc 0 setgray fill pop
          } ifelse
        } ifelse
      } ifelse
    } ifelse
  } forall
  % (Leaving ldiagshowpoints) 0 ldiagdebugprint
} def


/ldiagshowtags
{
  % (Entering ldiagshowtags) 0 ldiagdebugprint
  ldiagtoptagdict
  { 1 index 100 string cvs
    % dup 0 ldiagdebugprint
    (ldiagdebugpos) search
    { pop pop pop pop pop }
    {
      (CIRCUM) search % if CIRCUM in key
      { pop pop pop pop pop }
      { 
        (ANGLE) search % if ANGLE in key
        {
          pop pop pop pop pop
        }
        {
          (ldiagtagdict) search
          {
            pop pop pop pop pop
          }
          {
	    pop cvx exec 2 copy
	    gsave
	    newpath 2.0 pt 0 360 arc 0 setgray fill
            /Times-Roman findfont 8 pt scalefont setfont
            translate 40 rotate 0.2 cm 0.1 cm moveto 100 string cvs show
	    grestore
          } ifelse
        } ifelse
      } ifelse
    } ifelse
  } forall
  % (Leaving ldiagshowtags) 0 ldiagdebugprint
} def


% show angles: - ldiagshowangles -
/ldiagshowangles
{
  % (Entering ldiagshowangles) 0 ldiagdebugprint
  ldiagtoptagdict
  { 1 index 100 string cvs
    % dup 0 ldiagdebugprint
    (ldiagdebugpos) search
    { pop pop pop pop pop }
    {
      (ldiagtagdict) search
      {
        pop pop pop pop pop
      }
      {
        (CIRCUM) search % if CIRCUM in key
        { pop pop pop pop pop }
        { 
          (@ANGLE) search % if ANGLE in key, draw the angle at the point
          {
            % (showing ANGLE) 5 ldiagdebugprint
            gsave exch pop exch pop cvx
            % (about to execute) 1 ldiagdebugprint
            exec translate rotate 0.8 0.8 scale pop
            newpath 0 0 2.0 pt 0 360 arc 0 setgray fill
            newpath 4 pt 0 moveto 9 pt 0 lineto
            9 pt 1.5 pt lineto 11 pt 0 lineto 9 pt -1.5 pt lineto
            9 pt 0 lineto [] 0 setdash 4 pt setlinewidth 0 setlinejoin
	    stroke grestore
            % (finished ANGLE) 5 ldiagdebugprint
          }
          {
            % else must be a point, we aren't showing those
            pop pop pop
          } ifelse
        } ifelse
      } ifelse
    } ifelse
  } forall
  % (Leaving ldiagshowangles) 0 ldiagdebugprint
} def

% fix an angle to 0 <= res < 360:  <angle> ldiagfixangle <angle>
/ldiagfixangle
{
  % (Entering ldiagfixangle) 1 ldiagdebugprint
  { dup 0 ge { exit } if
    360 add
  } loop
  { dup 360 lt { exit } if
    360 sub
  } loop
  % (Leaving ldiagfixangle) 1 ldiagdebugprint
} def

% find point on circumference of box:  alpha a b ldiagboxcircum x y
/ldiagboxcircum
{
  % (Entering ldiagboxcircum) 3 ldiagdebugprint
  4 dict begin
    /b exch def
    /a exch def
    ldiagfixangle /alpha exch def
    0 0 a b ldiagangleto /theta exch def

    % if alpha <= theta, return (a, a*tan(alpha))
    alpha theta le
    { a  a alpha sin mul alpha cos div }
    {
      % else if alpha <= 180 - theta, return (b*cot(alpha), b)
      alpha 180 theta sub le
      { b alpha cos mul alpha sin div  b }
      {
        % else if alpha <= 180 + theta, return (-a, -a*tan(alpha))
        alpha 180 theta add le
        { a neg  a neg alpha sin mul alpha cos div }
        {
	  % else if alpha <= 360 - theta, return (-b*cot(alpha), -b)
	  alpha 360 theta sub le
          { b neg alpha cos mul alpha sin div  b neg }
	  {
	    % else 360 - theta <= alpha, return (a, a*tan(alpha))
	    a  a alpha sin mul alpha cos div
	  } ifelse
        } ifelse
      } ifelse
    } ifelse
  end
  % (Leaving ldiagboxcircum) 2 ldiagdebugprint
} def

% find quadratic roots (assume a != 0): a b c ldiagqroots x1 x2 2
%                                                     or    x2 1
%                                                     or       0
/ldiagqroots
{
  4 dict begin
    /c exch def
    /b exch def
    /a exch def
    /disc b b mul 4 a c mul mul sub def
    disc 0 lt
    { 0
    }
    { disc 0 eq
      { b neg 2 a mul div
	1
      }
      { b neg disc sqrt add 2 a mul div
        b neg disc sqrt sub 2 a mul div
	2
      }
      ifelse
    }
    ifelse
  end
} def

% work our which quadrant: <angle> ldiagquadrant <0-3>
/ldiagquadrant
{ dup 90 lt
  { pop 0
  }
  { dup 180 lt
    { pop 1
    }
    { 270 lt
      { 2
      }
      { 3
      } ifelse
    } ifelse
  } ifelse
} def

% find curvebox circum, assuming upper right quadrant: alpha a b xmk ldiagcb x y
/ldiagcb
{
  6 dict begin
    /xmk exch def
    /b exch def
    /a exch def
    /alpha exch def
    /theta1 0 0 a b xmk sub ldiagangleto def
    /theta2 0 0 a xmk sub b ldiagangleto def
    alpha theta1 le
    { % if alpha <= theta1, return (a, a*tan(alpha))
      a  a alpha sin mul alpha cos div
    }
    { alpha theta2 ge
      { % else if alpha > theta2, return (b*cot(alpha), b)
	b alpha cos mul alpha sin div  b
      }
      {
	% else, return the intersection of line and circle
	a xmk sub b xmk sub xmk  0 0 alpha ldiagcircleintersect
	dup 0 eq
	{ % should never happen, just return any reasonable point
	  pop
	  a b 0.5 ldiagpmul
	}
	{ 1 eq
	  { % should never happen, just return the point on top of stack
	  }
	  { % the usual case, two points on stack, return the larger
	    ldiagpmax
	  } ifelse
	} ifelse
      } ifelse
    } ifelse
  end
} def

% find point on circumference of curvebox: alpha a b xmk ldiagcurveboxcircum x y
/ldiagcurveboxcircum
{
  % (Entering ldiagcurveboxcircum) 4 ldiagdebugprint
  5 dict begin
    /xmk exch def
    /b exch def
    /a exch def
    ldiagfixangle /alpha exch def

    % work out which quadrant we are in, and reflect accordingly
    /quad alpha ldiagquadrant def
    quad 0 eq
    { alpha a b xmk ldiagcb
    }
    { quad 1 eq
      { 180 alpha sub a b xmk ldiagcb exch neg exch
      }
      { quad 2 eq
	{ alpha 180 sub a b xmk ldiagcb neg exch neg exch
	}
	{ 360 alpha sub a b xmk ldiagcb neg
	} ifelse
      } ifelse
    } ifelse
  end
  % (Leaving ldiagcurveboxcircum) 2 ldiagdebugprint
} def

% find point on circumference of diamond:  alpha a b ldiagdiamondcircum x y
/ldiagdiamondcircum
{
  % (Entering ldiagdiamondcircum) 3 ldiagdebugprint
  4 dict begin
    /b exch def
    /a exch def
    ldiagfixangle /alpha exch def
    b alpha cos abs mul  a alpha sin abs mul  add  /denom exch def
    a b mul alpha cos mul denom div
    a b mul alpha sin mul denom div
  end
  % (Leaving ldiagdiamondcircum) 2 ldiagdebugprint
} def

% find point on circumference of ellipse:  alpha a b ldiagellipsecircum x y
/ldiagellipsecircum
{
  % (Entering ldiagellipsecircum) 3 ldiagdebugprint
  4 dict begin
    /b exch def
    /a exch def
    ldiagfixangle /alpha exch def
    b alpha cos mul dup mul  a alpha sin mul dup mul  add sqrt /denom exch def
    a b mul alpha cos mul denom div
    a b mul alpha sin mul denom div
  end
  % (Leaving ldiagellipsecircum) 2 ldiagdebugprint
} def

% find point on circumference of isosceles:  alpha a b ldiagisoscelescircum x y
/ldiagisoscelescircum
{
  % (Entering ldiagisoscelescircum) 3 ldiagdebugprint
  7 dict begin
    /b exch def
    /a exch def
    /alpha exch ldiagfixangle def
    /theta1 90 def
    /theta2 a b 0.5 ldiagpmul 0 0 ldiagangleto def
    /theta3 a b 0.5 ldiagpmul a 0 ldiagangleto def
    alpha theta1 ge alpha theta2 le and
    { 0 0 a 2 div b
    }
    { alpha theta2 ge alpha theta3 le and
      { 0 0 a 0
      }
      { a 0 a 2 div b
      } ifelse
    } ifelse
    a 2 div b 2 div 2 copy 1 ft alpha ldiagatangle ldiaglineintersect
    a 2 div b 2 div 4 2 roll ldiagpsub
  end
  % (Leaving ldiagisoscelescircum) 2 ldiagdebugprint
} def

% find point of intersection of two lines each defined by two points
% x1 y1 x2 y2  x3 y3 x4 y4  ldiaglineintersect x y
/ldiaglineintersect
{
  % (Entering ldiaglineintersect) 8 ldiagdebugprint
  13 dict begin
    /y4 exch def
    /x4 exch def
    /y3 exch def
    /x3 exch def
    /y2 exch def
    /x2 exch def
    /y1 exch def
    /x1 exch def
    x2 x1 sub /x21 exch def
    x4 x3 sub /x43 exch def
    y2 y1 sub /y21 exch def
    y4 y3 sub /y43 exch def
    y21 x43 mul y43 x21 mul sub /det exch def
  
    % calculate x 
    y21 x43 mul x1 mul
    y43 x21 mul x3 mul sub
    y3 y1 sub x21 mul x43 mul add
    det div

    % calculate y
    x21 y43 mul y1 mul
    x43 y21 mul y3 mul sub
    x3 x1 sub y21 mul y43 mul add
    det neg div

  end
  % (Leaving ldiaglineintersect) 2 ldiagdebugprint
} def

% find point on circumference of polygon
% alpha radius num theta ldiagpolycircum x y
/ldiagpolycircum
{
  % (Entering ldiagpolycircum) 4 ldiagdebugprint
  13 dict begin
    /theta exch def
    /num exch def
    /radius exch def
    /alpha exch def

    % calculate delta, the angle from theta to alpha
    alpha theta sub ldiagfixangle

    % calculate the angle which is the multiple of 360/num closest to delta
    360 num div div truncate 360 num div mul theta add /anglea exch def

    % calculate the next multiple of 360/num after anglea
    anglea 360 num div add /angleb exch def

    % intersect the line through these two points with the alpha line
    anglea cos anglea sin  angleb cos angleb sin
    0 0  alpha cos 2 mul alpha sin 2 mul
    ldiaglineintersect radius ldiagpmul

  end
  % (Leaving ldiagpolycircum) 2 ldiagdebugprint
} def

% find point of intersection of a line and a circle
% x0 y0 r  x1 y1 theta  ldiagcircleintersect xa ya xb yb 2
%                                        or       xb yb 1
%                                        or             0
/ldiagcircleintersect
{
  % (Entering ldiagcircleintersect) 6 ldiagdebugprint
  15 dict begin
    /theta exch def
    /y1    exch def
    /x1    exch def
    /r     exch def
    /y0    exch def
    /x0    exch def

    % if sin(theta) = 0 then line is horizontal and y must be y1
    theta sin abs 0.00001 lt
    { 
      /a 1 def
      /b -2 x0 mul def
      /c x0 dup mul y1 y0 sub dup mul add r dup mul sub def
      a b c ldiagqroots dup
      0 eq
      { pop
	0
      }
      { 1 eq
	{ y1 1
	}
	{ y1 exch y1 2
	} ifelse
      } ifelse
    }
    {
      /ct theta cos theta sin div def
      /a ct ct mul 1 add def
      /b ct x1 x0 sub mul y1 add y0 sub 2 mul def
      /c x1 x0 sub dup mul y1 y0 sub dup mul add r dup mul sub def
      a b c ldiagqroots dup
      0 eq
      { pop
	0
      }
      { 1 eq
	{ y1 add /yb exch def
	  yb y1 sub ct mul x1 add /xb exch def
	  xb yb 1
	}
	{ y1 add /ya exch def
	  ya y1 sub ct mul x1 add /xa exch def
	  y1 add /yb exch def
	  yb y1 sub ct mul x1 add /xb exch def
	  xa ya xb yb 2
	} ifelse
      } ifelse
    } ifelse
  end
  % (Leaving ldiagcircleintersect) 1 ldiagdebugprint
} def

% find line which is the perpendicular bisector of two points, defined
% by two points
% x1 y1 x2 y2 ldiaglinebetween x3 y3 x4 y4
/ldiaglinebetween
{ % (Entering ldiaglinebetween) 4 ldiagdebugprint
  /y2 exch def /x2 exch def
  /y1 exch def /x1 exch def

  % let x3, y3 be the point halfway between the two points
  x1 y1 x2 y2 ldiagpadd 0.5 ldiagpmul
  /y3 exch def /x3 exch def

  % find a point perpendicular to x3, y3
  x3 y3 50 x1 y1 x2 y2 ldiagangleto 90 dg add ldiagatangle

  % plus x3 y3 gives the two points
  x3 y3

  % (Leaving ldiaglinebetween) 4 ldiagdebugprint
} def

% find <proc>@<string>:  <proc> <string> ldiagfindlabel <any> true
%                                                      <proc> <string> false
/ldiagfindlabel
{
  % (Entering ldiagfindlabel) 2 ldiagdebugprint
  exch dup length 1 ne
  { exch false
    % (Leaving ldiagfindabel (length not 1)) 3 ldiagdebugprint
  }
  { dup 0 get type /nametype ne
    { exch false
      % (Leaving ldiagfindabel (not a name)) 3 ldiagdebugprint
    }
    { dup 0 get dup length string cvs (@) ldiagconcat
      2 index ldiagconcat dup where
      { exch get exch pop exch pop cvx exec true
	% (Leaving ldiagfindlabel with success) 100 ldiagdebugprint
      }
      {
	pop exch false
	% (Leaving ldiagfindabel (concat not sensible)) 3 ldiagdebugprint
      } ifelse
    } ifelse
  } ifelse
} bind def

% execute <proc>@<string> or else default:  <proc> <string> ldiagdolabel <various>
/ldiagdolabel
{
  % (Entering ldiagdolabel) 2 ldiagdebugprint
  ldiagfindlabel not
  {
    dup (CIRCUM) eq
    { pop pop pop 0 0
    }
    {
      dup (ANGLE) eq
      { pop pop 0
      }
      { pop cvx exec
      } ifelse
    } ifelse
  } if
  % (Leaving ldiagdolabel) 2 ldiagdebugprint
} bind def

% execute a proc depending on whether number is negative, zero, or positive
% procneg proczero procpos number ldiagsigncase <anything>
/ldiagsigncase
{
  % (Entering ldiagsigncase) 4 ldiagdebugprint
  dup 0 lt
  { pop pop pop exec
  }
  { 0 gt
    { exch pop exch pop exec
    }
    { pop exch pop exec
    } ifelse
  } ifelse
  % (Leaving ldiagsigncase) 0 ldiagdebugprint
} bind def

% execute proci if angle is in ith quadrant
% proc45 proc270 proc180 proc90 proc0 proc315 proc225 proc135 angle ldiagquadcase <anything>
/ldiagquadcase
{
  % (Entering ldiagquadcase) 9 ldiagdebugprint
  round ldiagfixangle cvi dup 90 mod 0 eq
  { 90 idiv 4 add } { 90 idiv } ifelse
  8 exch roll pop pop pop pop pop pop pop exec
  % (Leaving ldiagquadcase) 0 ldiagdebugprint
} bind def

% decode Lout length into PostScript length
% <string> ldiagdecodelength <number>
/ldiagdecodelength
{
  % (Entering ldiagdecodelength) 1 ldiagdebugprint
  (f) search
  { exch pop exch pop cvr ft
  }
  { (c) search
    { exch pop exch pop cvr cm
    }
    { (p) search
      { exch pop exch pop cvr pt
      }
      { (m) search
	{ exch pop exch pop cvr em
	}
	{ (s) search
	  { exch pop exch pop cvr sp
	  }
	  { (v) search
	    { exch pop exch pop cvr vs
	    }
	    { (i) search
	      { exch pop exch pop cvr in
	      }
	      { pop 0
	      } ifelse
	    } ifelse
	  } ifelse
	} ifelse
      } ifelse
    } ifelse
  } ifelse
  % (Leaving ldiagdecodelength) 1 ldiagdebugprint
} def

% implement aabout function
% logical form:  <circum> <extra> <centre> aabout <point>
% actual form:   { <labelorpoint> } cvlit <length> [ <point> ] cvx aabout <point>
/ldiagaabout
{
  /centre exch def
  /extra exch def
  /circum exch def

  /ZXCTR [ centre ] cvx def
  /ZFCTR [ circum (CTR) ldiagdolabel ] cvx def
  /ZAREF ZFCTR ZXCTR ldiagangleto def
  /ZAMIN 0 dg def
  /ZPMIN [ circum (CTR) ldiagdolabel ZAREF ZAMIN sub
	 circum (CIRCUM) ldiagdolabel ldiagpadd
	 0 0 extra ZAREF ZAMIN sub ldiagatangle
	 ldiagpadd ] cvx def

  /ZAMAX 90 dg def
  /ZPMAX [ circum (CTR) ldiagdolabel ZAREF ZAMAX sub
	 circum (CIRCUM) ldiagdolabel ldiagpadd
	 0 0 extra ZAREF ZAMAX sub ldiagatangle
	 ldiagpadd ] cvx def

  1 1 20
  { /xval exch def
    /ZAMID ZAMIN ZAMAX add 0.5 mul def
    /ZPMID [ circum (CTR) ldiagdolabel ZAREF ZAMID sub
	   circum (CIRCUM) ldiagdolabel ldiagpadd
	   0 0 extra ZAREF ZAMID sub ldiagatangle
	   ldiagpadd ] cvx def
    ZPMID ZXCTR ldiagdistance ZFCTR ZXCTR ldiagdistance gt
    {
      /ZAMAX [ ZAMID ] cvx def
      /ZPMAX [ ZPMID ] cvx def
    }
    {
      /ZAMIN [ ZAMID ] cvx def
      /ZPMIN [ ZPMID ] cvx def
    } ifelse
  } for
  ZPMID
} def

% implement cabout function
% logical form:  <circum> <extra> <centre> cabout <point>
% actual form:   { <labelorpoint> } cvlit <length> [ <point> ] cvx cabout <point>
/ldiagcabout
{
  /centre exch def
  /extra exch def
  /circum exch def

  /ZXCTR [ centre ] cvx def
  /ZFCTR [ circum (CTR) ldiagdolabel ] cvx def
  /ZAREF ZFCTR ZXCTR ldiagangleto def
  /ZAMIN 0 dg def
  /ZPMIN [ circum (CTR) ldiagdolabel ZAREF ZAMIN add
	 circum (CIRCUM) ldiagdolabel ldiagpadd
	 0 0 extra ZAREF ZAMIN add ldiagatangle
	 ldiagpadd ] cvx def

  /ZAMAX 90 dg def
  /ZPMAX [ circum (CTR) ldiagdolabel ZAREF ZAMAX add
	 circum (CIRCUM) ldiagdolabel ldiagpadd
	 0 0 extra ZAREF ZAMAX add ldiagatangle
	 ldiagpadd ] cvx def

  1 1 20
  { /xval exch def
    /ZAMID ZAMIN ZAMAX add 0.5 mul def
    /ZPMID [ circum (CTR) ldiagdolabel ZAREF ZAMID add
	   circum (CIRCUM) ldiagdolabel ldiagpadd
	   0 0 extra ZAREF ZAMID add ldiagatangle
	   ldiagpadd ] cvx def
    ZPMID ZXCTR ldiagdistance ZFCTR ZXCTR ldiagdistance gt
    {
      /ZAMAX [ ZAMID ] cvx def
      /ZPMAX [ ZPMID ] cvx def
    }
    {
      /ZAMIN [ ZAMID ] cvx def
      /ZPMIN [ ZPMID ] cvx def
    } ifelse
  } for
  ZPMID
} def

% fromarrowlength toarrowlength { from } { to } xindent zindent ldiaglinepath -
/ldiaglinepath
{
  % (entering ldiaglinepath) 0 ldiagdebugprint
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel to (CTR) ldiagdolabel ldiagangleto
  /FROM@ANGLE ldiagangledef 
  from (CTR) ldiagdolabel FROM@ANGLE from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FROM@ANGLE ldiagatangle ldiagpadd
  /FROM ldiagpointdef

  FROM@ANGLE /TO@ANGLE ldiagangledef
  to (CTR) ldiagdolabel TO@ANGLE 180 dg sub to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TO@ANGLE 180 dg sub ldiagatangle ldiagpadd /TO ldiagpointdef

  FROM 0.5 ldiagpmul TO 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  FROM@ANGLE /LMID@ANGLE ldiagangledef

  /XINDENT xindent FROM LMID ldiagdistance ldiagmin def
  FROM 0 0 XINDENT FROM@ANGLE ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef

  /ZINDENT zindent TO LMID ldiagdistance ldiagmin def
  0 0 ZINDENT FROM@ANGLE ldiagatangle TO ldiagpsub /LTO ldiagpointdef
  FROM@ANGLE /LTO@ANGLE ldiagangledef

  direct { FROM TO } { FROM LFROM LMID LTO TO } ifelse

  % (leaving ldiaglinepath) 0 ldiagdebugprint
} def

% fromarrowlength toarrowlength { from } { to } xindent zindent pathgap ldiagdoublelinepath -
/ldiagdoublelinepath
{
  % (entering ldiagdoublelinepath) 0 ldiagdebugprint
  /pathgap exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel to (CTR) ldiagdolabel ldiagangleto
  /FROM@ANGLE ldiagangledef 
  from (CTR) ldiagdolabel FROM@ANGLE from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FROM@ANGLE ldiagatangle ldiagpadd
  /FROM ldiagpointdef

  FROM@ANGLE /TO@ANGLE ldiagangledef
  to (CTR) ldiagdolabel TO@ANGLE 180 dg sub to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TO@ANGLE 180 dg sub ldiagatangle ldiagpadd /TO ldiagpointdef

  FROM 0.5 ldiagpmul TO 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  FROM@ANGLE /LMID@ANGLE ldiagangledef

  /XINDENT xindent FROM LMID ldiagdistance ldiagmin def
  FROM 0 0 XINDENT FROM@ANGLE ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef

  /ZINDENT zindent TO LMID ldiagdistance ldiagmin def
  0 0 ZINDENT FROM@ANGLE ldiagatangle TO ldiagpsub /LTO ldiagpointdef
  FROM@ANGLE /LTO@ANGLE ldiagangledef

  direct {
    FROM pathgap 2 div FROM@ANGLE 90 dg sub ldiagatangle
    TO   pathgap 2 div FROM@ANGLE 90 dg sub ldiagatangle
    []
    FROM pathgap 2 div FROM@ANGLE 90 dg add ldiagatangle
    TO   pathgap 2 div FROM@ANGLE 90 dg add ldiagatangle
  }
  {
    FROM  pathgap 2 div FROM@ANGLE 90 dg sub ldiagatangle
    LFROM pathgap 2 div FROM@ANGLE 90 dg sub ldiagatangle
    LMID  pathgap 2 div FROM@ANGLE 90 dg sub ldiagatangle
    LTO   pathgap 2 div FROM@ANGLE 90 dg sub ldiagatangle
    TO    pathgap 2 div FROM@ANGLE 90 dg sub ldiagatangle
    []
    FROM  pathgap 2 div FROM@ANGLE 90 dg add ldiagatangle
    LFROM pathgap 2 div FROM@ANGLE 90 dg add ldiagatangle
    LMID  pathgap 2 div FROM@ANGLE 90 dg add ldiagatangle
    LTO   pathgap 2 div FROM@ANGLE 90 dg add ldiagatangle
    TO    pathgap 2 div FROM@ANGLE 90 dg add ldiagatangle
  } ifelse

  % (leaving ldiagdoublelinepath) 0 ldiagdebugprint
} def

% fromarrowlen toarrowlen { from } { to } xindent zindent bias ldiagacurvepath -
/ldiagacurvepath
{
  % (entering ldiagacurvepath) 0 ldiagdebugprint
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  %/B1 bias 0.02 ft ldiagmax def
  %/B2 from (CTR) ldiagdolabel to (CTR) ldiagdolabel ldiagdistance 0.5 mul def
  %/BIAS B1 B2 ldiagmin def
  /BIAS bias 0.02 ft ldiagmax def
  /XMID [ from (CTR) ldiagdolabel 0.5 ldiagpmul
	  to   (CTR) ldiagdolabel 0.5 ldiagpmul ldiagpadd ] cvx def
  /XTOP [ XMID 0 0 BIAS from (CTR) ldiagdolabel to (CTR) ldiagdolabel
	  ldiagangleto 90 dg sub ldiagatangle ldiagpadd ] cvx def
  /CTR [ from (CTR) ldiagdolabel XTOP ldiaglinebetween
	 to   (CTR) ldiagdolabel XTOP ldiaglinebetween
	 ldiaglineintersect ] cvx def

  from fromarrowlength [ CTR ] cvx ldiagaabout /FROM ldiagpointdef
  from (CTR) ldiagdolabel FROM ldiagdistance 0 gt
  { from (CTR) ldiagdolabel FROM ldiagangleto
  }
  { CTR FROM ldiagangleto 90 dg add
  } ifelse /FROM@ANGLE ldiagangledef

  to toarrowlength [ CTR ] cvx ldiagcabout /TO ldiagpointdef
  TO to (CTR) ldiagdolabel ldiagdistance 0 gt
  { TO to (CTR) ldiagdolabel ldiagangleto
  }
  { CTR TO ldiagangleto 90 dg add
  } ifelse /TO@ANGLE ldiagangledef

  /RADIUS CTR FROM ldiagdistance def
  CTR 0 0 RADIUS CTR FROM ldiagangleto 360 dg CTR TO ldiagangleto
  add CTR FROM ldiagangleto sub cvi 360 mod 0.5 mul add
  ldiagatangle ldiagpadd /LMID ldiagpointdef
  CTR LMID ldiagangleto 90 dg add /LMID@ANGLE ldiagangledef

  /XINDENT xindent FROM LMID ldiagdistance ldiagmin def
  CTR 0 0 RADIUS CTR FROM 0 0 XINDENT FROM@ANGLE ldiagatangle
  ldiagpadd ldiagangleto ldiagatangle ldiagpadd /LFROM ldiagpointdef
  CTR LFROM ldiagangleto 90 dg add /LFROM@ANGLE ldiagangledef

  /ZINDENT zindent TO LMID ldiagdistance ldiagmin def
  CTR 0 0 RADIUS CTR TO 0 0 ZINDENT TO@ANGLE 180 dg add
  ldiagatangle ldiagpadd ldiagangleto ldiagatangle ldiagpadd /LTO ldiagpointdef
  CTR LTO ldiagangleto 90 dg add /LTO@ANGLE ldiagangledef

  direct
  { FROM [CTR] TO }
  { FROM [CTR] LFROM [CTR] LMID [CTR] LTO [CTR] TO }
  ifelse

  % (leaving ldiagacurvepath) 0 ldiagdebugprint
} def

% fromarrowlen toarrowlen { from } { to } xindent zindent bias ldiagccurvepath -
/ldiagccurvepath
{
  % (entering ldiagccurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  %/B1 bias 0.02 ft ldiagmax def
  %/B2 from (CTR) ldiagdolabel to (CTR) ldiagdolabel ldiagdistance 0.5 mul def
  %/BIAS B1 B2 ldiagmin def
  /BIAS bias 0.02 ft ldiagmax def
  /XMID [ from (CTR) ldiagdolabel 0.5 ldiagpmul
	to (CTR) ldiagdolabel 0.5 ldiagpmul ldiagpadd ] cvx def
  /XTOP [ XMID 0 0 BIAS from (CTR) ldiagdolabel to (CTR) ldiagdolabel
	ldiagangleto 90 dg add ldiagatangle ldiagpadd ] cvx def
  /CTR [ from (CTR) ldiagdolabel XTOP ldiaglinebetween
         to (CTR) ldiagdolabel XTOP ldiaglinebetween ldiaglineintersect ] cvx def

  from fromarrowlength [ CTR ] cvx ldiagcabout /FROM ldiagpointdef
  from (CTR) ldiagdolabel FROM ldiagdistance 0 gt
  { from (CTR) ldiagdolabel FROM ldiagangleto }
  { CTR FROM ldiagangleto 90 dg sub }
  ifelse /FROM@ANGLE ldiagangledef

  to toarrowlength [ CTR ] cvx ldiagaabout /TO ldiagpointdef
  TO to (CTR) ldiagdolabel ldiagdistance 0 gt
  { TO to (CTR) ldiagdolabel ldiagangleto }
  { CTR TO ldiagangleto 90 dg sub }
  ifelse /TO@ANGLE ldiagangledef

  /RADIUS [ CTR FROM ldiagdistance ] cvx def
  CTR 0 0 RADIUS CTR TO ldiagangleto 360 dg CTR FROM ldiagangleto add
  CTR TO ldiagangleto sub cvi 360 cvi mod 2 div add ldiagatangle
  ldiagpadd /LMID ldiagpointdef
  CTR LMID ldiagangleto 90 dg sub /LMID@ANGLE ldiagangledef

  /XINDENT [ xindent FROM LMID ldiagdistance ldiagmin ] cvx def
  CTR 0 0 RADIUS CTR FROM 0 0 XINDENT FROM@ANGLE ldiagatangle ldiagpadd
  ldiagangleto ldiagatangle ldiagpadd /LFROM ldiagpointdef
  CTR LFROM ldiagangleto 90 dg sub /LFROM@ANGLE ldiagangledef

  /ZINDENT [ zindent TO LMID ldiagdistance ldiagmin ] cvx def
  CTR 0 0 RADIUS CTR TO 0 0 ZINDENT TO@ANGLE 180 dg add ldiagatangle
  ldiagpadd ldiagangleto ldiagatangle ldiagpadd /LTO ldiagpointdef
  CTR LTO ldiagangleto 90 dg sub /LTO@ANGLE ldiagangledef

  direct
  { FROM [CTR clockwise] TO }
  { FROM [CTR clockwise] LFROM [CTR clockwise]
  LMID [CTR clockwise] LTO [CTR clockwise] TO }
  ifelse
  % (leaving ldiagccurvepath) 0 ldiagdebugprint
} def


% farr tarr { from } { to } xindent zindent [frompt] [topt] ldiagbezierpath -
/ldiagbezierpath
{
  % (entering ldiagbezierpath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  cvx /topt exch def
  cvx /frompt exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel frompt ldiagangleto /FROM@ANGLE ldiagangledef
  from (CTR) ldiagdolabel FROM@ANGLE from (CIRCUM) ldiagdolabel
  ldiagpadd 0 0 fromarrowlength FROM@ANGLE ldiagatangle ldiagpadd
  /FROM ldiagpointdef

  topt to (CTR) ldiagdolabel ldiagangleto /TO@ANGLE ldiagangledef
  to (CTR) ldiagdolabel TO@ANGLE 180 dg add to (CIRCUM) ldiagdolabel
  ldiagpadd 0 0 toarrowlength TO@ANGLE 180 dg add ldiagatangle ldiagpadd
  /TO ldiagpointdef

  FROM 0 0 xindent FROM@ANGLE ldiagatangle ldiagpadd
  /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef

  TO 0 0 zindent TO@ANGLE 180 dg add ldiagatangle ldiagpadd
  /LTO ldiagpointdef
  TO@ANGLE /LTO@ANGLE ldiagangledef

  FROM TO ldiagpadd frompt ldiagpadd topt ldiagpadd 0.25 ldiagpmul
  /LMID ldiagpointdef

  FROM [frompt topt] TO

  % (leaving ldiagbezierpath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def


% farr tarr { from } { to } xindent zindent ldiagvhlinepath -
/ldiagvhlinepath
{
  % (entering ldiagvhlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /CTR [ from (CTR) ldiagdolabel pop to (CTR) ldiagdolabel exch pop ] cvx def
  /FANG [ from (CTR) ldiagdolabel CTR ldiagangleto ] cvx def
  /TANG [ to (CTR) ldiagdolabel CTR ldiagangleto ] cvx def

  from (CTR) ldiagdolabel FANG from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FANG ldiagatangle ldiagpadd /FROM ldiagpointdef
  FANG /FROM@ANGLE ldiagangledef

  to (CTR) ldiagdolabel TANG to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TANG ldiagatangle ldiagpadd /TO ldiagpointdef
  TANG 180 dg add /TO@ANGLE ldiagangledef

  /FDIST [ FROM CTR ldiagdistance ] cvx def
  /TDIST [ TO CTR ldiagdistance ] cvx def
  /XINDENT [ xindent FDIST ldiagmin ] cvx def
  /ZINDENT [ zindent TDIST ldiagmin ] cvx def
  FROM 0 0 XINDENT FANG ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef
  TO 0 0 ZINDENT TANG ldiagatangle ldiagpadd /LTO ldiagpointdef
  TO@ANGLE /LTO@ANGLE ldiagangledef

  CTR /LMID ldiagpointdef
  0 0 1 ft FANG 180 dg add ldiagatangle
  0 0 1 ft TANG 180 dg add ldiagatangle
  ldiagangleto /LMID@ANGLE ldiagangledef

  FROM LFROM LMID LTO TO

  % (leaving ldiagvhlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent radius ldiagvhcurvepath -
/ldiagvhcurvepath
{
  % (entering ldiagvhcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /CTR [ from (CTR) ldiagdolabel pop to (CTR) ldiagdolabel exch pop ] cvx def
  /FANG [ from (CTR) ldiagdolabel CTR ldiagangleto ] cvx def
  /TANG [ to (CTR) ldiagdolabel CTR ldiagangleto ] cvx def

  from (CTR) ldiagdolabel FANG from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FANG ldiagatangle ldiagpadd /FROM ldiagpointdef
  FANG /FROM@ANGLE ldiagangledef

  to (CTR) ldiagdolabel TANG to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TANG ldiagatangle ldiagpadd /TO ldiagpointdef
  TANG 180 dg add /TO@ANGLE ldiagangledef

  /FDIST [ FROM CTR ldiagdistance ] cvx def
  /TDIST [ TO CTR ldiagdistance ] cvx def
  /RADIUS [ radius FDIST TDIST ldiagmin ldiagmin ] cvx def
  /XINDENT [ xindent FDIST RADIUS sub ldiagmin ] cvx def
  /ZINDENT [ zindent TDIST RADIUS sub ldiagmin ] cvx def

  FROM 0 0 XINDENT FANG ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef
  TO 0 0 ZINDENT TANG ldiagatangle ldiagpadd /LTO ldiagpointdef
  TO@ANGLE /LTO@ANGLE ldiagangledef

  /FCTR [ CTR 0 0 RADIUS FROM@ANGLE 180 dg add ldiagatangle ldiagpadd ] cvx def
  /TCTR [ CTR 0 0 RADIUS TO@ANGLE ldiagatangle ldiagpadd ] cvx def
  /XCTR [ CTR 0 0 RADIUS FROM@ANGLE 180 dg add ldiagatangle ldiagpadd
              0 0 RADIUS TO@ANGLE ldiagatangle ldiagpadd ] cvx def
  XCTR 0 0 RADIUS XCTR CTR ldiagangleto ldiagatangle ldiagpadd
  /LMID ldiagpointdef
  FCTR TCTR ldiagangleto /LMID@ANGLE ldiagangledef

  FROM LFROM FCTR
  {[XCTR clockwise]} {} {} {} {} {[XCTR]} {[XCTR clockwise]} {[XCTR]}
  FCTR TCTR ldiagangleto ldiagquadcase
  TCTR LTO TO

  % (leaving ldiagvhcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent ldiaghvlinepath -
/ldiaghvlinepath
{
  % (entering ldiaghvlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /CTR [ to (CTR) ldiagdolabel pop from (CTR) ldiagdolabel exch pop ] cvx def
  /FANG [ from (CTR) ldiagdolabel CTR ldiagangleto ] cvx def
  /TANG [ to (CTR) ldiagdolabel CTR ldiagangleto ] cvx def

  from (CTR) ldiagdolabel FANG from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FANG ldiagatangle ldiagpadd /FROM ldiagpointdef
  FANG /FROM@ANGLE ldiagangledef

  to (CTR) ldiagdolabel TANG to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TANG ldiagatangle ldiagpadd /TO ldiagpointdef
  TANG 180 dg add /TO@ANGLE ldiagangledef

  /FDIST [ FROM CTR ldiagdistance ] cvx def
  /TDIST [ TO CTR ldiagdistance ] cvx def
  /XINDENT [ xindent FDIST ldiagmin ] cvx def
  /ZINDENT [ zindent TDIST ldiagmin ] cvx def

  FROM 0 0 XINDENT FANG ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef
  TO 0 0 ZINDENT TANG ldiagatangle ldiagpadd /LTO ldiagpointdef
  TO@ANGLE /LTO@ANGLE ldiagangledef

  CTR /LMID ldiagpointdef
  0 0 1 ft FANG 180 dg add ldiagatangle
  0 0 1 ft TANG 180 dg add ldiagatangle ldiagangleto
  /LMID@ANGLE ldiagangledef

  FROM LFROM LMID LTO TO

  % (leaving ldiaghvlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent radius ldiaghvcurvepath -
/ldiaghvcurvepath
{
  % (entering ldiaghvcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /CTR [ to (CTR) ldiagdolabel pop from (CTR) ldiagdolabel exch pop ] cvx def
  /FANG [ from (CTR) ldiagdolabel CTR ldiagangleto ] cvx def
  /TANG [ to (CTR) ldiagdolabel CTR ldiagangleto ] cvx def

  from (CTR) ldiagdolabel FANG from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FANG ldiagatangle ldiagpadd /FROM ldiagpointdef
  FANG /FROM@ANGLE ldiagangledef

  to (CTR) ldiagdolabel TANG to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TANG ldiagatangle ldiagpadd /TO ldiagpointdef
  TANG 180 dg add /TO@ANGLE ldiagangledef

  /FDIST [ FROM CTR ldiagdistance ] cvx def
  /TDIST [ TO CTR ldiagdistance ] cvx def
  /RADIUS [ radius FDIST TDIST ldiagmin ldiagmin ] cvx def
  /XINDENT [ xindent FDIST RADIUS sub ldiagmin ] cvx def
  /ZINDENT [ zindent TDIST RADIUS sub ldiagmin ] cvx def
  FROM 0 0 XINDENT FANG ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef
  TO 0 0 ZINDENT TANG ldiagatangle ldiagpadd /LTO ldiagpointdef
  TO@ANGLE /LTO@ANGLE ldiagangledef

  /FCTR [ CTR 0 0 RADIUS FROM@ANGLE 180 dg add ldiagatangle ldiagpadd ] cvx def
  /TCTR [ CTR 0 0 RADIUS TO@ANGLE ldiagatangle ldiagpadd ] cvx def
  /XCTR [ CTR 0 0 RADIUS FROM@ANGLE 180 dg add ldiagatangle ldiagpadd
	      0 0 RADIUS TO@ANGLE ldiagatangle ldiagpadd ] cvx def
  XCTR 0 0 RADIUS XCTR CTR ldiagangleto ldiagatangle ldiagpadd
  /LMID ldiagpointdef
  FCTR TCTR ldiagangleto /LMID@ANGLE ldiagangledef

  FROM LFROM FCTR
  {[XCTR]} {} {} {} {} {[XCTR clockwise]} {[XCTR]} {[XCTR clockwise]}
  FCTR TCTR ldiagangleto ldiagquadcase
  TCTR LTO TO

  % (leaving ldiaghvcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias ldiaglvrlinepath -
/ldiaglvrlinepath
{
  % (entering ldiaglvrlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel 180 dg from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength 180 dg ldiagatangle ldiagpadd /FROM ldiagpointdef
  180 dg /FROM@ANGLE ldiagangledef

  to (CTR) ldiagdolabel 180 dg to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength 180 dg ldiagatangle ldiagpadd /TO ldiagpointdef
  0 dg /TO@ANGLE ldiagangledef

  /XLEFT [ FROM pop TO pop ldiagmin bias sub ] cvx def
  XLEFT FROM exch pop /P1 ldiagpointdef
  XLEFT TO exch pop /P2 ldiagpointdef
  /VERT [ P1 P2 ldiagangleto ] cvx def
  P1 P1 0 0 1 ft 180 dg ldiagatangle ldiagpadd 0 0 1 ft VERT ldiagatangle
  ldiagpadd ldiagangleto /P1@ANGLE ldiagangledef
  P2 P2 0 0 1 ft 0 dg ldiagatangle ldiagpadd 0 0 1 ft VERT ldiagatangle
  ldiagpadd ldiagangleto /P2@ANGLE ldiagangledef

  P1 0.5 ldiagpmul P2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  VERT /LMID@ANGLE ldiagangledef

  /XINDENT [ xindent FROM P1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent P2 TO ldiagdistance ldiagmin ] cvx def
  XINDENT 0 FROM ldiagpsub /LFROM ldiagpointdef
  180 dg /LFROM@ANGLE ldiagangledef
  ZINDENT 0 TO ldiagpsub /LTO ldiagpointdef
  0 dg /LTO@ANGLE ldiagangledef

  FROM LFROM P1 LMID P2 LTO TO

  % (leaving ldiaglvrlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias radius ldiaglvrcurvepath -
/ldiaglvrcurvepath
{
  % (entering ldiaglvrcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel 180 dg from (CIRCUM) ldiagdolabel ldiagpadd 0 0
  fromarrowlength 180 dg ldiagatangle ldiagpadd /FROM ldiagpointdef
  180 dg /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel 180 dg to (CIRCUM) ldiagdolabel ldiagpadd 0 0
  toarrowlength 180 dg ldiagatangle ldiagpadd /TO ldiagpointdef
  0 dg /TO@ANGLE ldiagangledef
  /XLEFT [ FROM pop TO pop ldiagmin bias sub ] cvx def
  /XP1 [ XLEFT FROM exch pop ] cvx def
  /XP2 [ XLEFT TO exch pop ] cvx def
  /VERT [ XP1 XP2 ldiagangleto ] cvx def
  XP1 0.5 ldiagpmul XP2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  VERT /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM XP1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent XP2 TO ldiagdistance ldiagmin ] cvx def
  XINDENT 0 FROM ldiagpsub /LFROM ldiagpointdef
  180 dg /LFROM@ANGLE ldiagangledef
  ZINDENT 0 TO ldiagpsub /LTO ldiagpointdef
  0 dg /LTO@ANGLE ldiagangledef
  /RADIUS [ radius XP1 XP2 ldiagdistance 2 div ldiagmin ] cvx def
  /XP1PRE [ XP1 0 0 RADIUS 0 dg ldiagatangle ldiagpadd ] cvx def
  /XP1POST [ XP1 0 0 RADIUS VERT ldiagatangle ldiagpadd ] cvx def
  /XP1CTR [ XP1PRE 0 0 RADIUS VERT ldiagatangle ldiagpadd ] cvx def
  XP1CTR 0 0 RADIUS XP1CTR XP1 ldiagangleto ldiagatangle ldiagpadd
  /P1 ldiagpointdef
  XP1PRE XP1POST ldiagangleto /P1@ANGLE ldiagangledef
  /XP2PRE [ 0 0 RADIUS VERT ldiagatangle XP2 ldiagpsub ] cvx def
  /XP2POST [ XP2 0 0 RADIUS 0 dg ldiagatangle ldiagpadd ] cvx def
  /XP2CTR [ XP2PRE 0 0 RADIUS 0 dg ldiagatangle ldiagpadd ] cvx def
  XP2CTR 0 0 RADIUS XP2CTR XP2 ldiagangleto ldiagatangle ldiagpadd
  /P2 ldiagpointdef
  XP2PRE XP2POST ldiagangleto /P2@ANGLE ldiagangledef
  FROM LFROM XP1PRE
  {  } { [XP1CTR] P1 [XP1CTR] } {  } { [XP1CTR clockwise] P1 [XP1CTR clockwise] }
  {  } {  } {  } {  } VERT round ldiagquadcase
  XP1POST LMID XP2PRE
  {  } { [XP2CTR] P2 [XP2CTR] } {  } { [XP2CTR clockwise] P2 [XP2CTR clockwise] }
  {  } {  } {  } {  } VERT round ldiagquadcase
  XP2POST LTO TO

  % (leaving ldiaglvrcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias ldiagrvllinepath -
/ldiagrvllinepath
{
  % (entering ldiagrvllinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel 0 dg from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength 0 dg ldiagatangle ldiagpadd /FROM ldiagpointdef
  0 dg /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel 0 dg to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength 0 dg ldiagatangle ldiagpadd /TO ldiagpointdef
  180 dg /TO@ANGLE ldiagangledef
  /XRIGHT [ FROM pop TO pop ldiagmax bias add ] cvx def
  XRIGHT FROM exch pop /P1 ldiagpointdef
  XRIGHT TO exch pop /P2 ldiagpointdef
  /VERT [ P1 P2 ldiagangleto ] cvx def
  P1 P1 0 0 1 ft 0 dg ldiagatangle ldiagpadd 0 0 1 ft VERT ldiagatangle
  ldiagpadd ldiagangleto /P1@ANGLE ldiagangledef
  P2 P2 0 0 1 ft 180 dg ldiagatangle ldiagpadd 0 0 1 ft VERT ldiagatangle
  ldiagpadd ldiagangleto /P2@ANGLE ldiagangledef
  P1 0.5 ldiagpmul P2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  VERT /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM P1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent P2 TO ldiagdistance ldiagmin ] cvx def
  FROM XINDENT 0 ldiagpadd /LFROM ldiagpointdef
  0 dg /LFROM@ANGLE ldiagangledef
  TO ZINDENT 0 ldiagpadd /LTO ldiagpointdef
  180 dg /LTO@ANGLE ldiagangledef
  FROM LFROM P1 LMID P2 LTO TO

  % (leaving ldiagrvllinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def


% farr tarr { from } { to } xindent zindent bias radius ldiagrvlcurvepath -
/ldiagrvlcurvepath
{
  % (entering ldiagrvlcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel 0 dg from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength 0 dg ldiagatangle ldiagpadd /FROM ldiagpointdef
  0 dg /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel 0 dg to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength 0 dg ldiagatangle ldiagpadd /TO ldiagpointdef
  180 dg /TO@ANGLE ldiagangledef
  /XRIGHT [ FROM pop TO pop ldiagmax bias add ] cvx def
  /XP1 [ XRIGHT FROM exch pop ] cvx def
  /XP2 [ XRIGHT TO exch pop ] cvx def
  /VERT [ XP1 XP2 ldiagangleto ] cvx def
  XP1 0.5 ldiagpmul XP2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  VERT /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM XP1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent XP2 TO ldiagdistance ldiagmin ] cvx def
  FROM XINDENT 0 ldiagpadd /LFROM ldiagpointdef
  0 dg /LFROM@ANGLE ldiagangledef
  TO ZINDENT 0 ldiagpadd /LTO ldiagpointdef
  180 dg /LTO@ANGLE ldiagangledef
  /RADIUS [ radius XP1 XP2 ldiagdistance 0.5 mul ldiagmin ] cvx def
  /XP1PRE [ XP1 0 0 RADIUS 180 dg ldiagatangle ldiagpadd ] cvx def
  /XP1POST [ XP1 0 0 RADIUS VERT ldiagatangle ldiagpadd ] cvx def
  /XP1CTR [ XP1PRE 0 0 RADIUS VERT ldiagatangle ldiagpadd ] cvx def
  XP1CTR 0 0 RADIUS XP1CTR XP1 ldiagangleto ldiagatangle ldiagpadd
  /P1 ldiagpointdef
  XP1PRE XP1POST ldiagangleto /P1@ANGLE ldiagangledef
  /XP2PRE [ 0 0 RADIUS VERT ldiagatangle XP2 ldiagpsub ] cvx def
  /XP2POST [ XP2 0 0 RADIUS 180 dg ldiagatangle ldiagpadd ] cvx def
  /XP2CTR [ XP2PRE 0 0 RADIUS 180 dg ldiagatangle ldiagpadd ] cvx def
  XP2CTR 0 0 RADIUS XP2CTR XP2 ldiagangleto ldiagatangle ldiagpadd
  /P2 ldiagpointdef
  XP2PRE XP2POST ldiagangleto /P2@ANGLE ldiagangledef
  FROM LFROM XP1PRE
  {} {[XP1CTR clockwise] P1 [XP1CTR clockwise]} {} {[XP1CTR] P1 [XP1CTR]}
  {} {} {} {} VERT round ldiagquadcase
  XP1POST LMID XP2PRE
  {} {[XP2CTR clockwise] P2 [XP2CTR clockwise]} {} {[XP2CTR] P2 [XP2CTR]}
  {} {} {} {} VERT round ldiagquadcase
  XP2POST LTO TO

  % (leaving ldiagrvlcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias ldiagdhulinepath -
/ldiagdhulinepath
{
  % (entering ldiagdhulinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel 270 dg from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength 270 dg ldiagatangle ldiagpadd /FROM ldiagpointdef
  270 dg /FROM@ANGLE ldiagangledef

  to (CTR) ldiagdolabel 270 dg to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength 270 dg ldiagatangle ldiagpadd /TO ldiagpointdef
  90 dg /TO@ANGLE ldiagangledef

  /XDOWN [ FROM exch pop TO exch pop ldiagmin bias sub ] cvx def
  FROM pop XDOWN /P1 ldiagpointdef
  TO pop XDOWN /P2 ldiagpointdef
  /HORIZ [ P1 P2 ldiagangleto ] cvx def
  P1 P1 0 0 1 ft 270 dg ldiagatangle ldiagpadd 0 0 1 ft HORIZ ldiagatangle
  ldiagpadd ldiagangleto /P1@ANGLE ldiagangledef
  P2 P2 0 0 1 ft 90 dg ldiagatangle ldiagpadd 0 0 1 ft HORIZ ldiagatangle
  ldiagpadd ldiagangleto /P2@ANGLE ldiagangledef

  P1 0.5 ldiagpmul P2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  HORIZ /LMID@ANGLE ldiagangledef

  /XINDENT [ xindent FROM P1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent P2 TO ldiagdistance ldiagmin ] cvx def
  0 XINDENT FROM ldiagpsub /LFROM ldiagpointdef
  270 dg /LFROM@ANGLE ldiagangledef
  0 ZINDENT TO ldiagpsub /LTO ldiagpointdef
  90 dg /LTO@ANGLE ldiagangledef

  FROM LFROM P1 LMID P2 LTO TO

  % (leaving ldiagdhulinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias radius ldiagdhucurvepath -
/ldiagdhucurvepath
{
  % (entering ldiagdhucurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel 270 dg from (CIRCUM) ldiagdolabel ldiagpadd 0 0
  fromarrowlength 270 dg ldiagatangle ldiagpadd /FROM ldiagpointdef
  270 dg /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel 270 dg to (CIRCUM) ldiagdolabel ldiagpadd 0 0
  toarrowlength 270 dg ldiagatangle ldiagpadd /TO ldiagpointdef
  90 dg /TO@ANGLE ldiagangledef
  /XDOWN [ FROM exch pop TO exch pop ldiagmin bias sub ] cvx def
  /XP1 [ FROM pop XDOWN ] cvx def
  /XP2 [ TO pop XDOWN ] cvx def
  /HORIZ [ XP1 XP2 ldiagangleto ] cvx def
  XP1 0.5 ldiagpmul XP2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  HORIZ /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM XP1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent XP2 TO ldiagdistance ldiagmin ] cvx def
  0 XINDENT FROM ldiagpsub /LFROM ldiagpointdef
  270 dg /LFROM@ANGLE ldiagangledef
  0 ZINDENT TO ldiagpsub /LTO ldiagpointdef
  90 dg /LTO@ANGLE ldiagangledef
  /RADIUS [ radius XP1 XP2 ldiagdistance 2 div ldiagmin ] cvx def
  /XP1PRE [ XP1 0 0 RADIUS 90 dg ldiagatangle ldiagpadd ] cvx def
  /XP1POST [ XP1 0 0 RADIUS HORIZ ldiagatangle ldiagpadd ] cvx def
  /XP1CTR [ XP1PRE 0 0 RADIUS HORIZ ldiagatangle ldiagpadd ] cvx def
  XP1CTR 0 0 RADIUS XP1CTR XP1 ldiagangleto ldiagatangle ldiagpadd
  /P1 ldiagpointdef
  XP1PRE XP1POST ldiagangleto /P1@ANGLE ldiagangledef
  /XP2PRE [ 0 0 RADIUS HORIZ ldiagatangle XP2 ldiagpsub ] cvx def
  /XP2POST [ XP2 0 0 RADIUS 90 dg ldiagatangle ldiagpadd ] cvx def
  /XP2CTR [ XP2PRE 0 0 RADIUS 90 dg ldiagatangle ldiagpadd ] cvx def
  XP2CTR 0 0 RADIUS XP2CTR XP2 ldiagangleto ldiagatangle ldiagpadd
  /P2 ldiagpointdef
  XP2PRE XP2POST ldiagangleto /P2@ANGLE ldiagangledef
  FROM LFROM XP1PRE
  {} {} { [XP1CTR clockwise] P1 [XP1CTR clockwise] } {} { [XP1CTR] P1 [XP1CTR] }
  {} {} {} HORIZ round ldiagquadcase
  XP1POST LMID XP2PRE
  {} {} { [XP2CTR clockwise ] P2 [XP2CTR clockwise ] } {} { [XP2CTR] P2 [XP2CTR] }
  {} {} {} HORIZ round ldiagquadcase
  XP2POST LTO TO

  % (leaving ldiagdhucurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias ldiaguhdlinepath -
/ldiaguhdlinepath
{
  % (entering ldiaguhdlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel 90 dg from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength 90 dg ldiagatangle ldiagpadd /FROM ldiagpointdef
  90 dg /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel 90 dg to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength 90 dg ldiagatangle ldiagpadd /TO ldiagpointdef
  270 dg /TO@ANGLE ldiagangledef
  /XUP [ FROM exch pop TO exch pop ldiagmax bias add ] cvx def
  FROM pop XUP /P1 ldiagpointdef
  TO pop XUP /P2 ldiagpointdef
  /HORIZ [ P1 P2 ldiagangleto ] cvx def
  P1 P1 0 0 1 ft 90 dg ldiagatangle ldiagpadd 0 0 1 ft HORIZ ldiagatangle
  ldiagpadd ldiagangleto /P1@ANGLE ldiagangledef
  P2 P2 0 0 1 ft 270 dg ldiagatangle ldiagpadd 0 0 1 ft HORIZ ldiagatangle
  ldiagpadd ldiagangleto /P2@ANGLE ldiagangledef
  P1 0.5 ldiagpmul P2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  HORIZ /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM P1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent P2 TO ldiagdistance ldiagmin ] cvx def
  FROM 0 XINDENT ldiagpadd /LFROM ldiagpointdef
  90 dg /LFROM@ANGLE ldiagangledef
  TO 0 ZINDENT ldiagpadd /LTO ldiagpointdef
  270 dg /LTO@ANGLE ldiagangledef
  FROM LFROM P1 LMID P2 LTO TO

  % (leaving ldiaguhdlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def


% farr tarr { from } { to } xindent zindent bias radius ldiaguhdcurvepath -
/ldiaguhdcurvepath
{
  % (entering ldiaguhdcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  from (CTR) ldiagdolabel 90 dg from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength 90 dg ldiagatangle ldiagpadd /FROM ldiagpointdef
  90 dg /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel 90 dg to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength 90 dg ldiagatangle ldiagpadd /TO ldiagpointdef
  270 dg /TO@ANGLE ldiagangledef
  /XUP [ FROM exch pop TO exch pop ldiagmax bias add ] cvx def
  /XP1 [ FROM pop XUP ] cvx def
  /XP2 [ TO pop XUP ] cvx def
  /HORIZ [ XP1 XP2 ldiagangleto ] cvx def
  XP1 0.5 ldiagpmul XP2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  HORIZ /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM XP1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent XP2 TO ldiagdistance ldiagmin ] cvx def
  FROM 0 XINDENT ldiagpadd /LFROM ldiagpointdef
  90 dg /LFROM@ANGLE ldiagangledef
  TO 0 ZINDENT ldiagpadd /LTO ldiagpointdef
  270 dg /LTO@ANGLE ldiagangledef
  /RADIUS [ radius XP1 XP2 ldiagdistance 0.5 mul ldiagmin ] cvx def
  /XP1PRE [ XP1 0 0 RADIUS 270 dg ldiagatangle ldiagpadd ] cvx def
  /XP1POST [ XP1 0 0 RADIUS HORIZ ldiagatangle ldiagpadd ] cvx def
  /XP1CTR [ XP1PRE 0 0 RADIUS HORIZ ldiagatangle ldiagpadd ] cvx def
  XP1CTR 0 0 RADIUS XP1CTR XP1 ldiagangleto ldiagatangle ldiagpadd
  /P1 ldiagpointdef
  XP1PRE XP1POST ldiagangleto /P1@ANGLE ldiagangledef
  /XP2PRE [ 0 0 RADIUS HORIZ ldiagatangle XP2 ldiagpsub ] cvx def
  /XP2POST [ XP2 0 0 RADIUS 270 dg ldiagatangle ldiagpadd ] cvx def
  /XP2CTR [ XP2PRE 0 0 RADIUS 270 dg ldiagatangle ldiagpadd ] cvx def
  XP2CTR 0 0 RADIUS XP2CTR XP2 ldiagangleto ldiagatangle ldiagpadd
  /P2 ldiagpointdef
  XP2PRE XP2POST ldiagangleto /P2@ANGLE ldiagangledef
  FROM LFROM XP1PRE
  {} {} {[XP1CTR] P1 [XP1CTR]} {} {[XP1CTR clockwise] P1 [XP1CTR clockwise]}
  {} {} {} HORIZ round ldiagquadcase
  XP1POST LMID XP2PRE
  {} {} {[XP2CTR] P2 [XP2CTR]} {} {[XP2CTR clockwise] P2 [XP2CTR clockwise]}
  {} {} {} HORIZ round ldiagquadcase
  XP2POST LTO TO

  % (leaving ldiaguhdcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent hfrac hbias ldiaghvhlinepath -
/ldiaghvhlinepath % still to do
{
  % (entering ldiaghvhlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /hbias exch def
  /hfrac exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /FRDIRN [ { 0 dg } { 180 dg } { 180 dg } { 0 dg }
  { 0 dg } { 0 dg } { 180 dg } { 180 dg }
  from (CTR) ldiagdolabel to (CTR) ldiagdolabel
  ldiagangleto ldiagquadcase ] cvx def
  /TODIRN [ FRDIRN 180 dg add ] cvx def
  from (CTR) ldiagdolabel FRDIRN from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FRDIRN ldiagatangle ldiagpadd /FROM ldiagpointdef
  FRDIRN /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel TODIRN to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TODIRN ldiagatangle ldiagpadd /TO ldiagpointdef
  FRDIRN /TO@ANGLE ldiagangledef
  /BIAS [ FROM pop TO pop sub abs hfrac mul hbias add ] cvx def
  FROM 0 0 BIAS FRDIRN ldiagatangle ldiagpadd /P1 ldiagpointdef
  P1 pop TO exch pop /P2 ldiagpointdef
  P1 0.5 ldiagpmul P2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  P1 P2 ldiagangleto /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM P1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent P2 TO ldiagdistance ldiagmin ] cvx def
  FROM 0 0 XINDENT FRDIRN ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FRDIRN /LFROM@ANGLE ldiagangledef
  TO 0 0 ZINDENT TODIRN ldiagatangle ldiagpadd /LTO ldiagpointdef
  FRDIRN /LTO@ANGLE ldiagangledef
  FROM LFROM P1 LMID P2 LTO TO

  % (leaving ldiaghvhlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def


% farr tarr { from } { to } xindent zindent hfrac hbias radius ldiaghvhcurvepath -
/ldiaghvhcurvepath % still to do
{
  % (entering ldiaghvhcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /hbias exch def
  /hfrac exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /FRDIRN [ { 0 dg } { 180 dg } { 180 dg } { 0 dg }
  { 0 dg } { 0 dg } { 180 dg } { 180 dg }
  from (CTR) ldiagdolabel to (CTR) ldiagdolabel
  ldiagangleto ldiagquadcase ] cvx def
  /TODIRN [ FRDIRN 180 dg add ] cvx def

  from (CTR) ldiagdolabel FRDIRN from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FRDIRN ldiagatangle ldiagpadd /FROM ldiagpointdef
  FRDIRN /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel TODIRN to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TODIRN ldiagatangle ldiagpadd /TO ldiagpointdef

  FRDIRN /TO@ANGLE ldiagangledef
  /BIAS [ FROM pop TO pop sub abs hfrac mul hbias add ] cvx def
  /XP1 [ FROM 0 0 BIAS FRDIRN ldiagatangle ldiagpadd ] cvx def
  /XP2 [ XP1 pop TO exch pop ] cvx def
  XP1 0.5 ldiagpmul XP2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  /VERT [ XP1 XP2 ldiagangleto round ] cvx def
  VERT /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM XP1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent XP2 TO ldiagdistance ldiagmin ] cvx def
  FROM 0 0 XINDENT FRDIRN ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FRDIRN /LFROM@ANGLE ldiagangledef
  TO 0 0 ZINDENT TODIRN ldiagatangle ldiagpadd /LTO ldiagpointdef
  FRDIRN /LTO@ANGLE ldiagangledef
  /RADIUS [ radius XP1 XP2 ldiagdistance 2 div ldiagmin ] cvx def
  /XP1PRE [ XP1 0 0 RADIUS TODIRN ldiagatangle ldiagpadd ] cvx def
  /XP1POST [ XP1 0 0 RADIUS VERT ldiagatangle ldiagpadd ] cvx def
  /XP1CTR [ XP1PRE 0 0 RADIUS VERT ldiagatangle ldiagpadd ] cvx def
  XP1CTR 0 0 RADIUS XP1CTR XP1 ldiagangleto ldiagatangle ldiagpadd /P1 ldiagpointdef
  XP1PRE XP1POST ldiagangleto /P1@ANGLE ldiagangledef
  /XP2PRE [ 0 0 RADIUS VERT ldiagatangle XP2 ldiagpsub ] cvx def
  /XP2POST [ XP2 0 0 RADIUS FRDIRN ldiagatangle ldiagpadd ] cvx def
  /XP2CTR [ 0 0 RADIUS VERT ldiagatangle XP2POST ldiagpsub ] cvx def
  XP2CTR 0 0 RADIUS XP2CTR XP2 ldiagangleto ldiagatangle ldiagpadd /P2 ldiagpointdef
  XP2PRE XP2POST ldiagangleto /P2@ANGLE ldiagangledef
  VERT FRDIRN sub 90 eq
  { /P1GO [ anticlockwise ] cvx def /P2GO [ clockwise ] cvx def }
  { /P1GO [ clockwise ] cvx def /P2GO [ anticlockwise ] cvx def }
  ifelse
  FROM LFROM
  XP1PRE [XP1CTR P1GO] P1 [XP1CTR P1GO] XP1POST
  LMID
  XP2PRE [XP2CTR P2GO] P2 [XP2CTR P2GO] XP2POST
  LTO TO

  % (leaving ldiaghvhcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent hfrac hbias ldiagvhvlinepath -
/ldiagvhvlinepath % still to do
{
  % (entering ldiagvhvlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /hbias exch def
  /hfrac exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /FRDIRN [ { 90 dg } { 270 dg } { 270 dg } { 0 dg }
  { 90 dg } { 270 dg } { 270 dg } { 90 dg }
  from (CTR) ldiagdolabel to (CTR) ldiagdolabel
  ldiagangleto ldiagquadcase ] cvx def
  /TODIRN [ FRDIRN 180 dg sub ] cvx def
  from (CTR) ldiagdolabel FRDIRN from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FRDIRN ldiagatangle ldiagpadd /FROM ldiagpointdef
  FRDIRN /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel TODIRN to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TODIRN ldiagatangle ldiagpadd /TO ldiagpointdef
  FRDIRN /TO@ANGLE ldiagangledef
  /BIAS [ FROM exch pop TO exch pop sub abs hfrac mul hbias ft add ] cvx def
  FROM 0 0 BIAS FRDIRN ldiagatangle ldiagpadd /P1 ldiagpointdef
  TO pop P1 exch pop /P2 ldiagpointdef
  P1 0.5 ldiagpmul P2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  P1 P2 ldiagangleto /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM P1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent P2 TO ldiagdistance ldiagmin ] cvx def
  FROM 0 0 XINDENT FRDIRN ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FRDIRN /LFROM@ANGLE ldiagangledef
  TO 0 0 ZINDENT TODIRN ldiagatangle ldiagpadd /LTO ldiagpointdef
  FRDIRN /LTO@ANGLE ldiagangledef
  FROM LFROM P1 LMID P2 LTO TO

  % (leaving ldiagvhvlinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def


% farr tarr { from } { to } xindent zindent hfrac hbias radius ldiagvhvcurvepath -
/ldiagvhvcurvepath % still to do
{
  % (entering ldiagvhvcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /hbias exch def
  /hfrac exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /FRDIRN [ { 90 dg } { 270 dg } { 270 dg } { 0 dg }
  { 90 dg } { 270 dg } { 270 dg } { 90 dg }
  from (CTR) ldiagdolabel to (CTR) ldiagdolabel
  ldiagangleto ldiagquadcase ] cvx def
  /TODIRN [ FRDIRN 180 dg sub ] cvx def
  from (CTR) ldiagdolabel FRDIRN from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength FRDIRN ldiagatangle ldiagpadd /FROM ldiagpointdef
  FRDIRN /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel TODIRN to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength TODIRN ldiagatangle ldiagpadd /TO ldiagpointdef
  FRDIRN /TO@ANGLE ldiagangledef
  /BIAS [ FROM exch pop TO exch pop sub abs hfrac mul hbias add ] cvx def
  /XP1 [ FROM 0 0 BIAS FRDIRN ldiagatangle ldiagpadd ] cvx def
  /XP2 [ TO pop XP1 exch pop ] cvx def
  XP1 0.5 ldiagpmul XP2 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  /VERT [ XP1 XP2 ldiagangleto round ] cvx def
  VERT /LMID@ANGLE ldiagangledef
  /XINDENT [ xindent FROM XP1 ldiagdistance ldiagmin ] cvx def
  /ZINDENT [ zindent XP2 TO ldiagdistance ldiagmin ] cvx def
  FROM 0 0 XINDENT FRDIRN ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FRDIRN /LFROM@ANGLE ldiagangledef
  TO 0 0 ZINDENT TODIRN ldiagatangle ldiagpadd /LTO ldiagpointdef
  FRDIRN /LTO@ANGLE ldiagangledef
  /RADIUS [ radius XP1 XP2 ldiagdistance 2 div ldiagmin ] cvx def
  /XP1PRE [ XP1 0 0 RADIUS TODIRN ldiagatangle ldiagpadd ] cvx def
  /XP1POST [ XP1 0 0 RADIUS VERT ldiagatangle ldiagpadd ] cvx def
  /XP1CTR [ XP1PRE 0 0 RADIUS VERT ldiagatangle ldiagpadd ] cvx def
  XP1CTR 0 0 RADIUS XP1CTR XP1 ldiagangleto ldiagatangle ldiagpadd /P1 ldiagpointdef
  XP1PRE XP1POST ldiagangleto /P1@ANGLE ldiagangledef
  /XP2PRE [ 0 0 RADIUS VERT ldiagatangle XP2 ldiagpsub ] cvx def
  /XP2POST [ XP2 0 0 RADIUS FRDIRN ldiagatangle ldiagpadd ] cvx def
  /XP2CTR [ 0 0 RADIUS VERT ldiagatangle XP2POST ldiagpsub ] cvx def
  XP2CTR 0 0 RADIUS XP2CTR XP2 ldiagangleto ldiagatangle ldiagpadd /P2 ldiagpointdef
  XP2PRE XP2POST ldiagangleto /P2@ANGLE ldiagangledef
  FRDIRN VERT sub 90 eq
  { /P1GO [ clockwise ] cvx def /P2GO [ anticlockwise ] cvx def }
  { /P1GO [ anticlockwise ] cvx def /P2GO [ clockwise ] cvx def }
  ifelse
  FROM LFROM
  XP1PRE [XP1CTR P1GO] P1 [XP1CTR P1GO] XP1POST
  LMID
  XP2PRE [XP2CTR P2GO] P2 [XP2CTR P2GO] XP2POST
  LTO TO


  % (leaving ldiagvhvcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias fbias tbias ldiagdwraplinepath -
/ldiagdwraplinepath
{
  % (entering ldiagdwraplinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /tbias exch def
  /fbias exch def
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /DIRN [ from (CTR) ldiagdolabel pop to (CTR) ldiagdolabel pop
  lt { 180 dg } { 0 dg } ifelse ] cvx def
  from (CTR) ldiagdolabel DIRN from (CIRCUM) ldiagdolabel ldiagpadd 0 0
  fromarrowlength DIRN ldiagatangle ldiagpadd /FROM ldiagpointdef
  DIRN /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel DIRN 180 dg add to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength DIRN 180 dg add ldiagatangle ldiagpadd /TO ldiagpointdef
  DIRN /TO@ANGLE ldiagangledef
  FROM 0 0 fbias 0 ldiagmax DIRN ldiagatangle ldiagpadd /P1 ldiagpointdef
  DIRN 180 dg eq { 225 dg } { -45 dg } ifelse /P1@ANGLE ldiagangledef
  TO 0 0 tbias 0 ldiagmax DIRN 180 dg add ldiagatangle ldiagpadd
  /P4 ldiagpointdef
  DIRN 180 dg eq { 135 dg } { 45 dg } ifelse /P4@ANGLE ldiagangledef
  /YC [ from (CTR) ldiagdolabel 270 dg from (CIRCUM) ldiagdolabel ldiagpadd
  exch pop to (CTR) ldiagdolabel 270 dg to (CIRCUM) ldiagdolabel ldiagpadd
  exch pop ldiagmin bias 0 ldiagmax sub ] cvx def
  P1 pop YC /P2 ldiagpointdef
  P4@ANGLE 180 dg sub /P2@ANGLE ldiagangledef
  P4 pop YC /P3 ldiagpointdef
  P1@ANGLE 180 dg sub /P3@ANGLE ldiagangledef
  /XINDENT [ xindent FROM P1 ldiagdistance ldiagmin ] cvx def
  FROM 0 0 XINDENT DIRN ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef
  /ZINDENT [ zindent TO P4 ldiagdistance ldiagmin ] cvx def
  TO 0 0 ZINDENT DIRN 180 dg add ldiagatangle ldiagpadd /LTO ldiagpointdef
  TO@ANGLE /LTO@ANGLE ldiagangledef
  P2 0.5 ldiagpmul P3 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  DIRN 180 dg sub /LMID@ANGLE ldiagangledef
  FROM P1 P2 P3 P4 TO

  % (leaving ldiagdwraplinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias fbias tbias radius
% ldiagdwrapcurvepath -
/ldiagdwrapcurvepath
{
  % (entering ldiagdwrapcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /tbias exch def
  /fbias exch def
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /DIRN [ from (CTR) ldiagdolabel pop to (CTR) ldiagdolabel pop lt
  { 180 dg } { 0 dg } ifelse ] cvx def
  /CLOCK [ from (CTR) ldiagdolabel pop to (CTR) ldiagdolabel pop lt
  { anticlockwise } { clockwise } ifelse ] cvx def
  from (CTR) ldiagdolabel DIRN from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength DIRN ldiagatangle ldiagpadd /FROM ldiagpointdef
  DIRN /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel DIRN 180 dg add to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength DIRN 180 dg add ldiagatangle ldiagpadd /TO ldiagpointdef
  DIRN /TO@ANGLE ldiagangledef
  /XP1 [ FROM 0 0 fbias 0 ldiagmax DIRN ldiagatangle ldiagpadd ] cvx def
  /XP4 [ TO 0 0 tbias 0 ldiagmax DIRN 180 dg add ldiagatangle ldiagpadd ] cvx def
  /YC [ from (CTR) ldiagdolabel 270 dg from (CIRCUM) ldiagdolabel ldiagpadd
  exch pop to (CTR) ldiagdolabel 270 dg to (CIRCUM) ldiagdolabel ldiagpadd
  exch pop ldiagmin bias 0 ldiagmax sub ] cvx def
  /XP2 [ XP1 pop YC ] cvx def
  /XP3 [ XP4 pop YC ] cvx def
  /RP1 [ radius XP1 FROM ldiagdistance XP1 XP2 ldiagdistance 2 div
  ldiagmin ldiagmin ] cvx def
  /XP1PRE [ XP1 0 0 RP1 XP1 FROM ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP1POST [ XP1 0 0 RP1 XP1 XP2 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP1CTR [ XP1PRE 0 0 RP1 XP1 XP2 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  XP1CTR 0 0 RP1 XP1CTR XP1 ldiagangleto ldiagatangle ldiagpadd /P1 ldiagpointdef
  XP1CTR P1 ldiagangleto DIRN add 90 dg sub /P1@ANGLE ldiagangledef
  /RP2 [ radius XP1 XP2 ldiagdistance 2 div XP2 XP3 ldiagdistance 2 div
  ldiagmin ldiagmin ] cvx def
  /XP2PRE [ XP2 0 0 RP2 XP2 XP1 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP2POST [ XP2 0 0 RP2 XP2 XP3 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP2CTR [ XP2PRE 0 0 RP2 XP2 XP3 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  XP2CTR 0 0 RP2 XP2CTR XP2 ldiagangleto ldiagatangle ldiagpadd /P2 ldiagpointdef
  XP2CTR P2 ldiagangleto DIRN add 90 dg sub /P2@ANGLE ldiagangledef
  /RP3 [ radius XP2 XP3 ldiagdistance 2 div XP3 XP4 ldiagdistance 2 div
  ldiagmin ldiagmin ] cvx def
  /XP3PRE [ XP3 0 0 RP3 XP3 XP2 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP3POST [ XP3 0 0 RP3 XP3 XP4 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP3CTR [ XP3PRE 0 0 RP3 XP3 XP4 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  XP3CTR 0 0 RP3 XP3CTR XP3 ldiagangleto ldiagatangle ldiagpadd /P3 ldiagpointdef
  XP3CTR P3 ldiagangleto DIRN add 90 dg sub /P3@ANGLE ldiagangledef
  /RP4 [ radius XP4 XP3 ldiagdistance 2 div XP4 TO ldiagdistance
  ldiagmin ldiagmin ] cvx def
  /XP4PRE [ XP4 0 0 RP4 XP4 XP3 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP4POST [ XP4 0 0 RP4 XP4 TO ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP4CTR [ XP4PRE 0 0 RP4 XP4 TO ldiagangleto ldiagatangle ldiagpadd ] cvx def
  XP4CTR 0 0 RP4 XP4CTR XP4 ldiagangleto ldiagatangle ldiagpadd /P4 ldiagpointdef
  XP4CTR P4 ldiagangleto DIRN add 90 dg sub /P4@ANGLE ldiagangledef
  /XINDENT [ xindent FROM XP1PRE ldiagdistance ldiagmin ] cvx def
  FROM 0 0 XINDENT DIRN ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef
  XP2 0.5 ldiagpmul XP3 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  DIRN 180 dg sub /LMID@ANGLE ldiagangledef
  /ZINDENT [ zindent TO XP4POST ldiagdistance ldiagmin ] cvx def
  TO 0 0 ZINDENT DIRN 180 dg add ldiagatangle ldiagpadd /LTO ldiagpointdef
  TO@ANGLE /LTO@ANGLE ldiagangledef
  FROM LFROM
  XP1PRE [XP1CTR CLOCK] XP1POST
  XP2PRE [XP2CTR CLOCK] XP2POST
  LMID
  XP3PRE [XP3CTR CLOCK] XP3POST
  XP4PRE [XP4CTR CLOCK] XP4POST
  LTO TO

  % (leaving ldiagdwrapcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias fbias tbias ldiaguwraplinepath -
/ldiaguwraplinepath
{
  % (entering ldiaguwraplinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /tbias exch def
  /fbias exch def
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /DIRN [ from (CTR) ldiagdolabel pop to (CTR) ldiagdolabel pop lt
  { 180 dg } { 0 dg } ifelse ] cvx def
  from (CTR) ldiagdolabel DIRN from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength DIRN ldiagatangle ldiagpadd /FROM ldiagpointdef
  DIRN /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel DIRN 180 dg add to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength DIRN 180 dg add ldiagatangle ldiagpadd /TO ldiagpointdef
  DIRN /TO@ANGLE ldiagangledef
  FROM 0 0 fbias 0 ldiagmax DIRN ldiagatangle ldiagpadd /P1 ldiagpointdef
  DIRN 180 dg eq { 135 dg } { 45 dg } ifelse /P1@ANGLE ldiagangledef
  TO 0 0 tbias 0 ldiagmax DIRN 180 dg add ldiagatangle ldiagpadd
  /P4 ldiagpointdef
  DIRN 180 dg eq { 225 dg } { -45 dg } ifelse /P4@ANGLE ldiagangledef
  /YC [ from (CTR) ldiagdolabel 90 dg from (CIRCUM) ldiagdolabel ldiagpadd
  exch pop to (CTR) ldiagdolabel 90 dg to (CIRCUM) ldiagdolabel ldiagpadd
  exch pop ldiagmax bias 0 ldiagmax add ] cvx def
  P1 pop YC /P2 ldiagpointdef
  P4@ANGLE 180 dg sub /P2@ANGLE ldiagangledef
  P4 pop YC /P3 ldiagpointdef
  P1@ANGLE 180 dg sub /P3@ANGLE ldiagangledef
  /XINDENT [ xindent FROM P1 ldiagdistance ldiagmin ] cvx def
  FROM 0 0 XINDENT DIRN ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef
  /ZINDENT [ zindent TO P4 ldiagdistance ldiagmin ] cvx def
  TO 0 0 ZINDENT DIRN 180 dg add ldiagatangle ldiagpadd /LTO ldiagpointdef
  TO@ANGLE /LTO@ANGLE ldiagangledef
  P2 0.5 ldiagpmul P3 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  DIRN 180 dg sub /LMID@ANGLE ldiagangledef
  FROM P1 P2 P3 P4 TO

  % (leaving ldiaguwraplinepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% farr tarr { from } { to } xindent zindent bias fbias tbias radius
% ldiaguwrapcurvepath -
/ldiaguwrapcurvepath
{
  % (entering ldiaguwrapcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
  /radius exch def
  /tbias exch def
  /fbias exch def
  /bias exch def
  /zindent exch def
  /xindent exch def
  cvlit /to exch def
  cvlit /from exch def
  /toarrowlength exch def
  /fromarrowlength exch def

  /DIRN [ from (CTR) ldiagdolabel pop to (CTR) ldiagdolabel pop lt
  { 180 dg } { 0 dg } ifelse ] cvx def
  /CLOCK [ from (CTR) ldiagdolabel pop to (CTR) ldiagdolabel pop lt
  { clockwise } { anticlockwise } ifelse ] cvx def
  from (CTR) ldiagdolabel DIRN from (CIRCUM) ldiagdolabel ldiagpadd
  0 0 fromarrowlength DIRN ldiagatangle ldiagpadd /FROM ldiagpointdef
  DIRN /FROM@ANGLE ldiagangledef
  to (CTR) ldiagdolabel DIRN 180 dg add to (CIRCUM) ldiagdolabel ldiagpadd
  0 0 toarrowlength DIRN 180 dg add ldiagatangle ldiagpadd /TO ldiagpointdef
  DIRN /TO@ANGLE ldiagangledef
  /XP1 [ FROM 0 0 fbias 0 ldiagmax DIRN ldiagatangle ldiagpadd ] cvx def
  /XP4 [ TO 0 0 tbias 0 ldiagmax DIRN 180 dg add ldiagatangle ldiagpadd ] cvx def
  /YC [ from (CTR) ldiagdolabel 90 dg from (CIRCUM) ldiagdolabel ldiagpadd
  exch pop to (CTR) ldiagdolabel 90 dg to (CIRCUM) ldiagdolabel ldiagpadd
  exch pop ldiagmax bias 0 ldiagmax add ] cvx def
  /XP2 [ XP1 pop YC ] cvx def
  /XP3 [ XP4 pop YC ] cvx def
  /RP1 [ radius XP1 FROM ldiagdistance XP1 XP2 ldiagdistance 2 div
  ldiagmin ldiagmin ] cvx def
  /XP1PRE [ XP1 0 0 RP1 XP1 FROM ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP1POST [ XP1 0 0 RP1 XP1 XP2 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP1CTR [ XP1PRE 0 0 RP1 XP1 XP2 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  XP1CTR 0 0 RP1 XP1CTR XP1 ldiagangleto ldiagatangle ldiagpadd /P1 ldiagpointdef
  XP1CTR P1 ldiagangleto DIRN add 90 dg add /P1@ANGLE ldiagangledef
  /RP2 [ radius XP1 XP2 ldiagdistance 2 div XP2 XP3 ldiagdistance 2 div
  ldiagmin ldiagmin ] cvx def
  /XP2PRE [ XP2 0 0 RP2 XP2 XP1 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP2POST [ XP2 0 0 RP2 XP2 XP3 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP2CTR [ XP2PRE 0 0 RP2 XP2 XP3 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  XP2CTR 0 0 RP2 XP2CTR XP2 ldiagangleto ldiagatangle ldiagpadd /P2 ldiagpointdef
  XP2CTR P2 ldiagangleto DIRN add 90 dg add /P2@ANGLE ldiagangledef
  /RP3 [ radius XP2 XP3 ldiagdistance 2 div XP3 XP4 ldiagdistance 2 div
  ldiagmin ldiagmin ] cvx def
  /XP3PRE [ XP3 0 0 RP3 XP3 XP2 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP3POST [ XP3 0 0 RP3 XP3 XP4 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP3CTR [ XP3PRE 0 0 RP3 XP3 XP4 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  XP3CTR 0 0 RP3 XP3CTR XP3 ldiagangleto ldiagatangle ldiagpadd /P3 ldiagpointdef
  XP3CTR P3 ldiagangleto DIRN add 90 dg add /P3@ANGLE ldiagangledef
  /RP4 [ radius XP4 XP3 ldiagdistance 2 div XP4 TO ldiagdistance
  ldiagmin ldiagmin ] cvx def
  /XP4PRE [ XP4 0 0 RP4 XP4 XP3 ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP4POST [ XP4 0 0 RP4 XP4 TO ldiagangleto ldiagatangle ldiagpadd ] cvx def
  /XP4CTR [ XP4PRE 0 0 RP4 XP4 TO ldiagangleto ldiagatangle ldiagpadd ] cvx def
  XP4CTR 0 0 RP4 XP4CTR XP4 ldiagangleto ldiagatangle ldiagpadd /P4 ldiagpointdef
  XP4CTR P4 ldiagangleto DIRN add 90 dg add /P4@ANGLE ldiagangledef
  /XINDENT [ xindent FROM XP1PRE ldiagdistance ldiagmin ] cvx def
  FROM 0 0 XINDENT DIRN ldiagatangle ldiagpadd /LFROM ldiagpointdef
  FROM@ANGLE /LFROM@ANGLE ldiagangledef
  XP2 0.5 ldiagpmul XP3 0.5 ldiagpmul ldiagpadd /LMID ldiagpointdef
  DIRN 180 dg sub /LMID@ANGLE ldiagangledef
  /ZINDENT [ zindent TO XP4POST ldiagdistance ldiagmin ] cvx def
  TO 0 0 ZINDENT DIRN 180 dg add ldiagatangle ldiagpadd /LTO ldiagpointdef
  TO@ANGLE /LTO@ANGLE ldiagangledef
  FROM LFROM
  XP1PRE [XP1CTR CLOCK] XP1POST
  XP2PRE [XP2CTR CLOCK] XP2POST
  LMID
  XP3PRE [XP3CTR CLOCK] XP3POST
  XP4PRE [XP4CTR CLOCK] XP4POST
  LTO TO

  % (leaving ldiaguwrapcurvepath) 0 ldiagdebugprint
  % count (  stack size is) 1 ldiagdebugprint pop
} def

% shape and labels of the @SolidArrowHead symbol
% - ldiagsolidarrowhead -
/ldiagsolidarrowhead
{
  0 0 xsize ysize 0.5 mul 0 ysize
} def

% shape and labels of the @SolidWithBarArrowHead symbol
% <pathwidth> ldiagsolidwithbararrowhead -
/ldiagsolidwithbararrowhead
{
  /pathwidth exch def
  /XBK [ xsize pathwidth 0.5 mul sub ] cvx def
  /XFW [ xsize pathwidth 0.5 mul add ] cvx def
  0 0 XBK ysize 0.5 mul XBK 0 XFW 0 XFW ysize
  XBK ysize XBK ysize 0.5 mul 0 ysize 0 0
} def

% shape and labels of the @OpenArrowHead symbol
% <pathwidth> <pathgap> ldiagopenarrowhead -
/ldiagopenarrowhead
{
  /pathgap exch def
  /pathwidth exch def
  /PSW [ 0 0 ] cvx def
  /PNW [ 0 ysize ] cvx def
  /PE  [ xsize ysize 0.5 mul ] cvx def
  /REL [ 0 0 pathwidth PE PNW ldiagangleto 90 add ldiagatangle ] cvx def
  pathgap 0 eq
  {
    /PNA [ 0 ysize 0.5 mul pathwidth 0.5 mul add ] cvx def
    /PSA [ 0 ysize 0.5 mul pathwidth 0.5 mul sub ] cvx def
    /PNI [ PNA PNA xsize 0 ldiagpadd PNW REL ldiagpadd
	   PE REL ldiagpadd ldiaglineintersect ] cvx def
    /PSI [ 0 pathwidth PNI ldiagpsub ] cvx def

    PSW PE PNW PNI PNA PSA PSI PSW
  }
  {
    /PNA [ 0 ysize 0.5 mul pathgap 0.5 mul add pathwidth 0.5 mul add ] cvx def
    /PSA [ 0 ysize 0.5 mul pathgap 0.5 mul sub pathwidth 0.5 mul sub ] cvx def
    /PNI [ PNA PNA xsize 0 ldiagpadd PNW REL ldiagpadd
	   PE REL ldiagpadd ldiaglineintersect ] cvx def
    /PSI [ 0 pathwidth pathgap add PNI ldiagpsub ] cvx def
    /PXA [ 0 pathwidth PNA ldiagpsub ] cvx def
    /PXI [ 0 pathwidth PNI ldiagpsub ] cvx def
    /PYA [ 0 pathwidth PSA ldiagpadd ] cvx def
    /PYI [ 0 pathwidth PSI ldiagpadd ] cvx def

    PSW PE PNW PNI PNA PXA PXI PYI PYA PSA PSI PSW
  } ifelse
} def

% shape and labels of the @HalfOpenArrowHead symbol
% <pathwidth> <pathgap> ldiaghalfopenarrowhead -
/ldiaghalfopenarrowhead
{
  /pathgap exch def
  /pathwidth exch def
  0 0
  xsize ysize 0.5 mul
  0 ysize
  pathgap 0 eq
  {
    xsize 0.3 mul ysize 0.5 mul pathwidth 0.5 mul add
    0             ysize 0.5 mul pathwidth 0.5 mul add
    0             ysize 0.5 mul pathwidth 0.5 mul sub
    xsize 0.3 mul ysize 0.5 mul pathwidth 0.5 mul sub
  }
  {
    xsize 0.3 mul ysize 0.5 mul pathgap 0.5 mul add pathwidth 0.5 mul add
    0             ysize 0.5 mul pathgap 0.5 mul add pathwidth 0.5 mul add
    0             ysize 0.5 mul pathgap 0.5 mul add pathwidth 0.5 mul sub
    xsize 0.3 mul ysize 0.5 mul pathgap 0.5 mul add pathwidth 0.5 mul sub
    xsize 0.3 mul ysize 0.5 mul pathgap 0.5 mul sub pathwidth 0.5 mul add
    0             ysize 0.5 mul pathgap 0.5 mul sub pathwidth 0.5 mul add
    0             ysize 0.5 mul pathgap 0.5 mul sub pathwidth 0.5 mul sub
    xsize 0.3 mul ysize 0.5 mul pathgap 0.5 mul sub pathwidth 0.5 mul sub
  } ifelse
  0 0
} def

% shape and labels of the @SolidCurvedArrowHead symbol
% - ldiagsolidcurvedarrowhead -
/ldiagsolidcurvedarrowhead
{
  0 0
  [0 0 xsize ysize 0.5 mul ldiaglinebetween
   xsize 0 xsize ysize ldiaglineintersect clockwise]
  xsize ysize 0.5 mul
  [xsize ysize 0.5 mul 0 ysize ldiaglinebetween
   xsize 0 xsize ysize ldiaglineintersect clockwise]
  0 ysize
} def

% shape and labels of the @OpenCurvedArrowHead symbol
% <pathwidth> <pathgap> ldiagopencurvedarrowhead -
/ldiagopencurvedarrowhead
{
  /pathgap exch def
  /pathwidth exch def
  /LR [ 0 0 xsize ysize 0.5 mul ldiaglinebetween
	xsize 0 xsize ysize ldiaglineintersect
      ] cvx def
  /UR [ xsize ysize 0.5 mul 0 ysize ldiaglinebetween
	xsize 0 xsize ysize ldiaglineintersect
      ] cvx def
  /PW2 [ pathwidth 0.5 mul ] cvx def
  0 0
  [LR clockwise]
  xsize ysize 0.5 mul
  [UR clockwise]
  0 ysize
  pathgap 0 eq
  {
    /UMID [
	0 ysize 0.5 mul PW2 add
	xsize ysize 0.5 mul PW2 add
	0 ysize 0 0 1 ft UR 0 ysize ldiagangleto 90 add ldiagatangle
	ldiagpadd 0 ysize ldiaglineintersect
    ] cvx def
    /LMID [ 0 pathwidth UMID ldiagpsub ] cvx def
    UMID
    0 ysize 0.5 mul PW2 add
    0 ysize 0.5 mul PW2 sub
    LMID
  }
  {
    /UMIDU [
	0 ysize 0.5 mul PW2 add pathgap 0.5 mul add
	xsize ysize 0.5 mul PW2 add pathgap 0.5 mul add
	0 ysize 0 0 1 ft UR 0 ysize ldiagangleto 90 add ldiagatangle
	ldiagpadd 0 ysize ldiaglineintersect
    ] cvx def
    /UMIDL [ 0 pathwidth UMIDU ldiagpsub ] cvx def
    /LMIDL [ 0 pathgap 0 pathwidth UMIDU ldiagpsub ldiagpsub ] cvx def
    /LMIDU [ 0 pathwidth LMIDL ldiagpadd ] cvx def
    UMIDU
    0 UMIDU exch pop
    0 UMIDL exch pop
    UMIDL
    LMIDU
    0 LMIDU exch pop
    0 LMIDL exch pop
    LMIDL
  } ifelse
  0 0
} def

% shape and labels of the @HalfOpenCurvedArrowHead symbol
% <pathwidth> <pathgap> ldiaghalfopencurvedarrowhead -
/ldiaghalfopencurvedarrowhead
{
  /pathgap exch def
  /pathwidth exch def
  /LR [ 0 0 xsize ysize 0.5 mul ldiaglinebetween
	xsize 0 xsize ysize ldiaglineintersect
      ] cvx def
  /UR [ xsize ysize 0.5 mul 0 ysize ldiaglinebetween
	xsize 0 xsize ysize ldiaglineintersect
      ] cvx def
  /BR [ 0 0 LR 0 ysize UR ldiaglineintersect ] cvx def
  /BRAD [ 0 0 BR ldiagdistance ] cvx def
  /PW2 [ pathwidth 0.5 mul ] cvx def
  0 0
  [LR clockwise]
  xsize ysize 0.5 mul
  [UR clockwise]
  0 ysize
  [BR clockwise]
  pathgap 0 eq
  {
    /XDIST [ BRAD dup mul PW2 dup mul sub sqrt ] cvx def
    /UMID [ BR XDIST PW2 ldiagpadd ] cvx def
    /LMID [ BR XDIST 0 PW2 sub ldiagpadd ] cvx def
    UMID
    0 ysize 0.5 mul PW2 add
    0 ysize 0.5 mul PW2 sub
    LMID
  }
  {
    /XDIST [ BRAD dup mul PW2 dup mul sub sqrt ] cvx def
    /UMIDU [ BR XDIST PW2 pathgap 0.5 mul add ldiagpadd ] cvx def
    /UMIDL [ 0 pathwidth UMIDU ldiagpsub ] cvx def
    /LMIDL [ BR XDIST 0 PW2 sub pathgap 0.5 mul sub ldiagpadd ] cvx def
    /LMIDU [ 0 pathwidth LMIDL ldiagpadd ] cvx def
    UMIDU
    0 UMIDU exch pop
    0 UMIDL exch pop
    UMIDL
    LMIDU
    0 LMIDU exch pop
    0 LMIDL exch pop
    LMIDL
  } ifelse
  [BR clockwise]
  0 0
} def

% shape and labels of the @ManyArrowHead symbol
% <pathwidth> ldiagmanyarrowhead -
/ldiagmanyarrowhead
{
  /pathwidth exch def
  /LL [ 0 ysize 2 div pathwidth 2 div sub ] cvx def
  /LU [ 0 ysize 2 div pathwidth 2 div add ] cvx def
  LL
  xsize 0
  xsize pathwidth
  LU
  LL
  []
  LL
  xsize LL exch pop
  xsize LU exch pop
  LU
  LL
  []
  LL
  xsize ysize pathwidth sub
  xsize ysize
  LU
  LL
} def

end
%%EndResource
