path: root/grapheps.ps

/plotdict 100 dict def
plotdict begin

% Get dimensions the preamble left on the stack.
4 array astore /whole-page exch def

% Definitions so that internal assignments are bound before setting.
/DATA 0 def
/DEN 0 def
/DIAG 0 def
/DIAG2 0 def
/DLTA 0 def
/EXPSN 0 def
/GPROCS 0 def
/GD 6 def
/GR 3 def
/IDX 0 def
/ISIZ 0 def
/MAX 0 def
/MIN 0 def
/NUM 0 def
/PLOT-bmargin 0 def
/PLOT-lmargin 0 def
/PLOT-rmargin 0 def
/PLOT-tmargin 0 def
/PROC 0 def
/ROW 0 def
/TXT 0 def
/WPAGE 0 def
/X-COORD 0 def
/XDX 0 def
/XOFF 0 def
/XPARTS 0 def
/XRNG 0 def
/XSCL 0 def
/XSTEP 0 def
/XSTEPH 0 def
/XTSCL 0 def
/XWID 0 def
/Y-COORD 0 def
/YDX 0 def
/YHIT 0 def
/YOFF 0 def
/YPARTS 0 def
/YRNG 0 def
/YSCL 0 def
/YSTEP 0 def
/YSTEPH 0 def
/YTSCL 0 def
/STP3 0 def
/STP2 0 def
/SCL 0 def
/graphrect 0 def
/plotrect 0 def

% Here are the procedure-arrays for passing as the third argument to
% plot-column.  Plot-column moves to the first coordinate before
% calls to the first procedure.  Thus both line and scatter graphs are
% supported.  Many additional glyph types can be produced as
% combinations of these types.  This is best accomplished by calling
% plot-column with each component.

% GD and GR are the graphic-glyph diameter and radius.
% DIAG and DIAG2, used in /cross are diagonal and twice diagonal.
% gtrans maps x, y coordinates on the stack to 72dpi page coordinates.

% Render line connecting points
/line    [{} {lineto} {}] bind def
/mountain [{currentpoint 2 copy pop bottomedge moveto lineto}
	   {lineto}
	   {currentpoint pop bottomedge lineto closepath fill}] bind def
/cloud    [{currentpoint 2 copy pop topedge moveto lineto}
	   {lineto}
	   {currentpoint pop topedge lineto closepath fill}] bind def
% Render lines from x-axis to points
/impulse [{} {moveto XRNG 0 get 0 gtrans exch pop
	      currentpoint pop exch lineto} {}] bind def
/bargraph [{} {exch GR sub exch dup
	       XRNG 0 get 0 gtrans exch pop % y=0
	       exch sub GD exch rectstroke} {}] bind def

% Solid round dot.
/disc    [{GD setlinewidth 1 setlinecap}
			 {moveto 0 0 rlineto} {}] bind def
% Minimal point -- invisible if linewidth is 0.
/point   [{1 setlinecap} {moveto 0 0 rlineto} {}] bind def
% Square box.
/square  [{} {GR sub exch GR sub exch GD dup rectstroke} {}] bind def
% Square box at 45.o
/diamond [{}
	  {2 copy GR add moveto
	   GR neg GR neg rlineto GR GR neg rlineto
		   GR GR rlineto GR neg GR rlineto
	   closepath}
	  {}] bind def
% Plus Sign
/plus	 [{}
	  {       GR sub moveto  0 GD rlineto
	   GR neg GR neg rmoveto GD 0 rlineto}
	  {}] bind def
% X Sign
/cross   [{/DIAG GR .707 mul def /DIAG2 DIAG 2 mul def}
	  {exch DIAG sub exch DIAG add moveto DIAG2 dup neg rlineto
			  DIAG2 neg 0 rmoveto     DIAG2 dup rlineto}
	  {}] bind def
% Triangle pointing upward
/triup   [{}
	  {GR 1.12 mul add moveto GR neg GR -1.62 mul rlineto
	   GR 2 mul 0 rlineto GR neg GR  1.62 mul rlineto
	   closepath}
	  {}] bind def
% Triangle pointing downward
/tridown [{}
	  {GR 1.12 mul sub moveto GR neg GR  1.62 mul rlineto
	   GR 2 mul 0 rlineto GR neg GR -1.62 mul rlineto
	   closepath}
	  {}] bind def
/pentagon [{}
	   {gsave translate 0 GR moveto 4 {72 rotate 0 GR lineto} repeat
		  closepath stroke grestore}
	   {}] bind def
/circle   [{stroke} {GR 0 360 arc stroke} {}] bind def

% ( TITLE ) ( SUBTITLE )
/title-top
{ dup stringwidth pop -2 div plotrect 0 get plotrect 2 get 2 div add add
  plotrect 1 get plotrect 3 get add pointsize .4 mul add moveto show
  dup stringwidth pop -2 div plotrect 0 get plotrect 2 get 2 div add add
  plotrect 1 get plotrect 3 get add pointsize 1.4 mul add moveto show
} bind def

% ( TITLE ) ( SUBTITLE )
/title-bottom
{ dup stringwidth pop -2 div plotrect 0 get plotrect 2 get 2 div add add
  plotrect 1 get pointsize -2 mul add moveto show
  dup stringwidth pop -2 div plotrect 0 get plotrect 2 get 2 div add add
  plotrect 1 get pointsize -1 mul add moveto show
} bind def

% Plots column K against column J of given two-dimensional ARRAY.
% The arguments are:
%   [ ARRAY J K ] J and K are column-indexes into ARRAY
%   [ PREAMBLE RENDER POSTAMBLE ] Plotting procedures:
%       PREAMBLE  - Executed once before plotting row
%       RENDER    - Called with each pair of coordinates to plot
%       POSTAMBLE - Called once after plotting row (often does stroke)
/plot-column
{ /GPROCS exch def aload pop /YDX exch def /XDX exch def /DATA exch def
  /GD glyphsize def
  /GR GD .5 mul def
  gsave
    /ROW DATA 0 get def ROW XDX get ROW YDX get gtrans moveto
    GPROCS 0 get exec % preamble
    /PROC GPROCS 1 get def DATA {dup XDX get exch YDX get gtrans PROC} forall
    GPROCS 2 get exec stroke % postamble
  grestore
} bind def

/partition-page
{ /YPARTS exch def /XPARTS exch def /WPAGE exch def
  /XWID WPAGE 2 get XPARTS div def /YHIT WPAGE 3 get YPARTS div def
  /Y-COORD WPAGE 1 get def
  YPARTS
  { /X-COORD WPAGE 0 get WPAGE 2 get add XWID sub def
    XPARTS {[X-COORD Y-COORD XWID YHIT]
	    /X-COORD X-COORD XWID sub def} repeat
    /Y-COORD Y-COORD YHIT add def
  } repeat
} bind def

/fudge3 % SCL STP3 STP2
{
    /STP2 exch def /STP3 exch def /SCL exch def
    SCL 3 mod 0 eq {STP3} {STP2} ifelse
%% leads to range error in CVS.
%    SCL abs 3000 gt {STP2} {SCL 3 mod 0 eq {STP3} {STP2} ifelse} ifelse
} bind def

% The arguments are:
%   [ MIN-X MIN-Y DELTA-X DELTA-Y ] whole graph rectangle
%   [ MIN-COLJ MAX-COLJ ] Numerical range of plot data
%   [ MIN-COLK MAX-COLK ] Numerical range of plot data
% and the implicit current clippath
/setup-plot
{ /YRNG exch def /XRNG exch def /graphrect exch def
  /PLOT-bmargin pointsize 2.4 mul def
  /PLOT-tmargin pointsize 2.4 mul def
  /PLOT-lmargin lmargin-template stringwidth pop pointsize 1.2 mul add def
  /PLOT-rmargin rmargin-template stringwidth pop pointsize 1.2 mul add def
  /plotrect [ graphrect 0 get PLOT-lmargin add
	      graphrect 1 get PLOT-bmargin add
	      graphrect 2 get PLOT-lmargin sub PLOT-rmargin sub
	      graphrect 3 get PLOT-bmargin sub PLOT-tmargin sub ] def
  /XOFF XRNG 0 get def /YOFF YRNG 0 get def
  /XSCL plotrect 2 get XRNG aload pop exch sub div def
  /YSCL plotrect 3 get YRNG aload pop exch sub div def
  /XOFF XOFF plotrect 0 get XSCL div sub def
  /YOFF YOFF plotrect 1 get YSCL div sub def
  /YTSCL plotrect 3 get YRNG aload pop exch sub abs find-tick-scale def
  /YSTEP YTSCL 0 get 6 8 fudge3 5 mul yuntrans YSCL sign mul def
  /XTSCL plotrect 2 get XRNG aload pop exch sub abs find-tick-scale def
  /XSTEP XTSCL 0 get 12 10 fudge3 5 mul xuntrans XSCL sign mul def
  /YSTEPH YSTEP 2 div def
  /XSTEPH XSTEP 2 div def
} bind def

% gtrans is the utility routine mapping data coordinates to view space.
% plot-column sets up XOFF, XSCL, and YSCL and uses it.
/gtrans {exch XOFF sub XSCL mul exch YOFF sub YSCL mul} bind def
%/guntrans {exch XSCL div XOFF add exch YSCL div YOFF add} bind def

% /ytrans {YTSCL aload pop div mul} bind def
% /xtrans {XTSCL aload pop div mul} bind def
/yuntrans {YTSCL aload pop exch div mul} bind def
/xuntrans {XTSCL aload pop exch div mul} bind def

/sign {dup 0 lt {pop -1} {0 gt {1} {0} ifelse} ifelse} bind def

/zero-in-range? {dup 0 get 0 le exch 1 get 0 ge and} bind def

/y-axis
{ XRNG zero-in-range?
    { 0 YRNG 0 get gtrans moveto 0 YRNG 1 get gtrans lineto stroke} if
} bind def
/x-axis
{ YRNG zero-in-range?
    {XRNG 0 get 0 gtrans moveto XRNG 1 get 0 gtrans lineto stroke} if
} bind def

% Find data range in column K of two-dimensional ARRAY.
%   ARRAY
%   K  is the column-index into ARRAY
/column-range
{ /IDX exch def dup /MIN exch 0 get IDX get def /MAX MIN def
  {IDX get dup dup MIN lt {/MIN exch def} {pop} ifelse
	       dup MAX gt {/MAX exch def} {pop} ifelse} forall
  [MIN MAX]
} bind def

/min {2 copy lt {pop} {exch pop} ifelse} bind def
/max {2 copy gt {pop} {exch pop} ifelse} bind def

/combine-ranges
{ aload pop 3 2 roll aload pop exch 4 3 roll min 3 1 roll max 2 array astore}
bind def

/pad-range
{ exch aload pop /MAX exch def /MIN exch def
  /EXPSN exch 100 div MAX MIN sub mul def
  [ MIN EXPSN sub  MAX EXPSN add ]
} bind def

/snap-range
{dup aload pop exch sub 1 exch find-tick-scale aload pop
     /DEN exch def /NUM exch def 1 NUM div DEN mul /DLTA exch def
     aload pop /MAX exch def /MIN exch def
     [ DLTA MAX MIN sub sub 2 div dup MIN exch sub exch MAX add ]
} bind def

% Given the width (or height) and the data-span, returns an array of
% numerator and denominator [NUM DEN]
%
% NUM will be 1, 2, 3, 4, 5, 6, or 8 times a power of ten.
% DEN will be a power of ten.
%
% NUM   ISIZ
% === < ====
% DEN   DLTA
/find-tick-scale
{/DLTA exch def /ISIZ exch def
 /DEN 1 def
 {DLTA abs ISIZ le {exit} if /DEN DEN 10 mul def /ISIZ ISIZ 10 mul def} loop
 /NUM 1 def
 {DLTA abs 10 mul ISIZ ge {exit} if /NUM NUM 10 mul def /DLTA DLTA 10 mul def} loop
 [[8 6 5 4 3 2 1] {/MAX exch def MAX DLTA mul ISIZ le {MAX exit} if} forall
  NUM mul DEN]
} bind def

/rule-vertical
{ /XWID exch def
  /TXT exch def
  /X-COORD exch def
  X-COORD type [] type eq {/X-COORD X-COORD 0 get def} if
  gsave
    X-COORD plotrect 1 get plotrect 3 get 2 div add translate
    TXT stringwidth pop -2 div
    XWID 0 gt { 90 rotate PLOT-lmargin} {-90 rotate PLOT-rmargin} ifelse
    pointsize 1.2 mul sub moveto TXT show
  grestore
  YRNG 0 get YSTEP div ceiling YSTEP mul  YSTEP  YRNG 1 get
  { /YDX exch def 0 YDX gtrans /Y-COORD exch def pop
    X-COORD Y-COORD moveto XWID 0 rlineto stroke
    /TXT YDX 20 string cvs def
    X-COORD
    XWID 0 gt {TXT stringwidth pop sub ( ) stringwidth pop sub
	       Y-COORD pointsize .3 mul sub moveto}
	      {Y-COORD pointsize .3 mul sub moveto ( ) show} ifelse
    TXT show} for
  YRNG 0 get YSTEPH div ceiling YSTEPH mul  YSTEPH  YRNG 1 get
  { /YDX exch def 0 YDX gtrans /Y-COORD exch def pop
    X-COORD Y-COORD moveto XWID 2 div 0 rlineto stroke} for
} bind def

/rule-horizontal
{ /YHIT exch def
  /TXT exch def
  /Y-COORD exch def
  Y-COORD type [] type eq {/Y-COORD Y-COORD 1 get def} if
  plotrect 0 get plotrect 2 get 2 div add TXT stringwidth pop -2 div add
  Y-COORD
  YHIT 0 gt {pointsize -2 mul} {pointsize 1.4 mul} ifelse add moveto TXT show
  XRNG 0 get XSTEP div ceiling XSTEP mul  XSTEP  XRNG 1 get
  { dup 0 gtrans pop /X-COORD exch def
    X-COORD Y-COORD moveto 0 YHIT rlineto stroke
    /TXT exch 10 string cvs def
    X-COORD TXT stringwidth pop 2.0 div sub
    Y-COORD YHIT 0 gt {pointsize sub} {pointsize .3 mul add} ifelse
    moveto TXT show
  } for
  XRNG 0 get XSTEPH div ceiling XSTEPH mul  XSTEPH  XRNG 1 get
  { 0 gtrans pop Y-COORD moveto 0 YHIT 2 div rlineto stroke} for
} bind def

/grid-verticals
{ XRNG 0 get XSTEPH div ceiling XSTEPH mul  XSTEPH  XRNG 1 get
  { 0 gtrans pop /X-COORD exch def
    X-COORD plotrect 1 get moveto 0 plotrect 3 get rlineto} for
  stroke
} bind def

/grid-horizontals
{ YRNG 0 get YSTEPH div ceiling YSTEPH mul  YSTEPH  YRNG 1 get
  { 0 exch gtrans /Y-COORD exch def pop
    plotrect 0 get Y-COORD moveto plotrect 2 get 0 rlineto} for
  stroke
} bind def

/leftedge {plotrect 0 get} bind def
/rightedge {plotrect dup 0 get exch 2 get add} bind def
/topedge {plotrect dup 1 get exch 3 get add} bind def
/bottomedge {plotrect 1 get} bind def

/outline-rect {aload pop rectstroke} bind def
/fill-rect {aload pop rectfill} bind def
/clip-to-rect {aload pop rectclip} bind def

/gstack [] def
/gpush {gsave /gstack [ gstack pointsize glyphsize ] def} bind def
/gpop {/gstack gstack aload pop /glyphsize exch def /pointsize exch def def grestore} bind def

% Default parameters

% The legend-templates are strings used to reserve horizontal space
/lmargin-template (-.0123456789) def
/rmargin-template (-.0123456789) def

% glyphsize is the graphic-glyph size; GR, graphic radius, is
% glyphsize/2.  Line width, set by "setlinewidth", must be much less
% than glyphsize for readable glyphs.
/glyphsize 6 def
% pointsize is the height of text characters in "points", 1/72 inch; 0.353.mm
/pointsize 12 def
% Set default font
/Helvetica pointsize selectfont

gsave