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PACKET std plot DEFINES drawing area, 
                        begin plot, 
                        end plot, 
                        clear, 
                        pen,
                        move, 
                        draw, 
                        get cursor:
 
LET delete = 0,                         {Farbcodes}
    std    = 1,
    black  = 5,
    white  = 6,

    durchgehend      = 1,               {Linientypen}
    gepunktet        = 2,
    kurz gestrichelt = 3,
    lang gestrichelt = 4,
    strichpunkt      = 5,

    empty            = 0,               {Punktsymbole}
    high             = 1,
    low              = 2, 
    both             = 3; 

LET POS = STRUCT (INT x, y);

ROW 79 ROW 24 INT VAR screen;
BOOL VAR colour :: TRUE, action :: TRUE;
POS VAR pos :: POS : (0, 0);
 
clear;

PROC drawing area (REAL VAR x cm, y cm, INT VAR x pixel, y pixel) : 
   x cm := 25.0;    y cm := 17.0;   {***** Horizontale und vertikale *****}
                                    {***** Gre in Zentimetern.     *****}
   x pixel := 79;   y pixel := 48   {***** Koordinaten des rechten   *****}
                                    {***** oberen Punktes.           *****}
END PROC drawing area;

PROC begin plot : 
ENDPROC begin plot ;
 
PROC end plot : 
ENDPROC end plot ;

PROC clear :
  INT VAR i, j;
  colour := TRUE;
  action := TRUE;
  pos := POS : (0, 0);

  FOR i FROM 1 UPTO 24
  REP screen [1] [i] := 0 PER;
  FOR i FROM 2 UPTO 79
  REP screen [i] := screen [1] PER;
  page;
  out (""6""23""0"")  .
END PROC clear;

PROC pen (INT CONST background, foreground, thickness, linetype):
  colour := foreground > 0;
  action := linetype <> 0  .

END PROC pen;

PROC move (INT CONST x, y) :
  out (""6""+ code (23-y DIV 2) + code (x)); 
  pos := POS  : (x, y) 
END PROC move;
 
PROC draw (INT CONST x, y) :
  IF action
  THEN vector (x-pos.x, y-pos.y) FI;
  pos := POS : (x, y)   .

END PROC draw;
 
PROC vector (INT CONST dx , dy) :
  IF dx >= 0
  THEN IF   dy >  dx THEN vector (pos.y, pos.x, dy, dx, 1, 1)
       ELIF dy >   0 THEN vector (pos.x, pos.y, dx, dy, 1, 1)
 
       ELIF dy > -dx THEN vector (pos.x, pos.y, dx, -dy, 1,-1)
       ELSE               vector (pos.y, pos.x, -dy, dx,-1, 1) FI

  ELSE IF   dy > -dx THEN vector (pos.y, pos.x, dy, -dx, 1,-1)
       ELIF dy >   0 THEN vector (pos.x, pos.y, -dx, dy,-1, 1)
 
       ELIF dy >  dx THEN vector (pos.x, pos.y, -dx, -dy,-1,-1)
       ELSE               vector (pos.y, pos.x, -dy, -dx,-1,-1) FI
  FI .
 
ENDPROC vector ;
 
PROC vector (INT VAR x pos, y pos, INT CONST dx, dy, right, up) :
  INT VAR i;
  prepare first step ;
  point;
  FOR i FROM 1 UPTO dx
  REP do one step PER  .

prepare first step :
  INT VAR up right error := dy - dx,
          right error := dy,
          old error := 0  .

do one step:
  IF right is better
    THEN do right step
    ELSE do up right step
  FI .
 
right is better :
  abs (old error + right error) < abs (old error + up right error)  .
 
do upright step :
  x pos INCR right ;
  y pos INCR up ;
  point ;
  old error INCR upright error .
 
do right step :
  x pos INCR right ;
  point ;
  old error INCR right error .
 
point :
  IF (pos.y AND 1) = 0
  THEN lower point
  ELSE upper point FI  .

lower point :
  out (""6""+ code (23-pos.y DIV 2) + code (pos.x));
  IF colour
  THEN set lower point
  ELSE reset lower point FI  .

set lower point:
  SELECT screen [pos.x+1] [pos.y DIV 2+1] OF
  CASE empty : out (","8"");
               screen [pos.x+1] [pos.y DIV 2+1] := low
  CASE high  : out ("|"8"");
               screen [pos.x+1] [pos.y DIV 2+1] := both
  ENDSELECT  .

reset lower point: 
  SELECT screen [pos.x+1] [pos.y DIV 2+1] OF
  CASE low   : out (" "8"");
               screen [pos.x+1] [pos.y DIV 2+1] := empty
  CASE both  : out ("'"8"");
               screen [pos.x+1] [pos.y DIV 2+1] := high
  ENDSELECT  .

upper point :
  out (""6""+ code (23-pos.y DIV 2) + code (pos.x)); 
  IF colour
  THEN set upper point
  ELSE reset upper point FI  .

set upper point:
  SELECT screen [pos.x+1] [pos.y DIV 2+1] OF
  CASE empty : out ("'"8"");
               screen [pos.x+1] [pos.y DIV 2+1] := high
  CASE low   : out ("|"8"");
               screen [pos.x+1] [pos.y DIV 2+1] := both
  ENDSELECT  .
 
reset upper point:
  SELECT screen [pos.x+1] [pos.y DIV 2+1] OF
  CASE high  : out (" "8"");
               screen [pos.x+1] [pos.y DIV 2+1] := empty
  CASE both  : out (","8"");
               screen [pos.x+1] [pos.y DIV 2+1] := low
  ENDSELECT  .

END PROC vector;
 
PROC draw (TEXT CONST record, REAL CONST angle, height, width):
   out (subtext (record, 1, 79-pos.x));
   out (""6""+ code (23-pos.y DIV 2) + code (pos.x)); 
END PROC draw;

PROC draw (TEXT CONST record) :
  draw (record, 0.0, 0.0, 0.0)
END PROC draw;
 
PROC get cursor (TEXT VAR t, INT VAR x, y) :
  x := pos.x;
  y := pos.y;
  REP out (""6""+ code (23-y DIV 2) + code (x)); 
      inchar (t);
      SELECT code (t) OF
      CASE 2 : x INCR 1
      CASE 3 : y INCR 1
      CASE 8 : x DECR 1
      CASE 10: y DECR 1
      CASE 1 : out (""0""1"" + text (x, 3) + "," + text (y, 3) + "  "13""16"")
      OTHERWISE leave get cursor ENDSELECT;
      check
  PER  .

leave get cursor:
  out (""6""+ code (23-pos.y DIV 2) + code (pos.x)); 
  LEAVE get cursor  .

check :
  IF x < 0
  THEN x := 0;
       out (""7"")
  ELIF x > 47
  THEN x := 47;
       out (""7"")
  FI; 
  IF y < 0
  THEN y := 0;
       out (""7"")
  ELIF y > 78
  THEN y := 78;
       out (""7"")
  FI  .

END PROC get cursor;

PROC test (INT CONST x, y, TEXT CONST t):
  out (""27";(" + text (x) + "," + text (y) + ")  " + t + ""29"");
  IF incharety (10000) = ""27""
  THEN stop FI
END PROC test;


END PACKET std plot;