PACKET clipping DEFINES set range, (*Autor: Heiko Indenbirken *)
get range, (*Stand: 27.06.85/12:39 *)
clip: (*Änderung: 11.08.86/15:02 *)
INT VAR x min :: 0, x max :: 1024, y min :: 0, y max :: 1024;
PROC set range (INT CONST h min, v min, h max, v max):
IF h min >= h max OR v min >= v max
THEN errorstop ("Incorrect Range") FI;
x min := h min; x max := h max;
y min := v min; y max := v max
END PROC set range;
PROC get range (INT VAR h min, v min, h max, v max):
h min := x min; h max := x max;
v min := y min; v max := y max
END PROC get range;
PROC clip (INT CONST from x, from y, to x, to y,
PROC (INT CONST, INT CONST) move,
PROC (INT CONST, INT CONST) draw):
INT VAR x, y;
calculate parts of line;
IF both points inside
THEN draw (to x, to y)
ELIF both points outside
THEN
ELIF first point outside
THEN intersection (to x, to y, from x, from y, from part, x, y);
move (x, y);
draw (x, y); (* Macke im SHARD *)
draw (to x, to y)
ELIF second point outside
THEN intersection (from x, from y, to x, to y, to part, x, y);
draw (x, y)
ELSE intersection (to x, to y, from x, from y, from part, x, y);
move (x, y);
draw (x, y); (* Macke im SHARD *)
clip (x, y, to x, to y, PROC (INT CONST, INT CONST) move,
PROC (INT CONST, INT CONST) draw)
FI .
calculate parts of line:
INT CONST from part :: part (from x, from y),
to part :: part (to x, to y) .
both points inside:
from part = 0 AND to part = 0 .
both points outside:
(from part AND to part) <> 0 .
first point outside:
from part <> 0 AND to part = 0 .
second point outside:
to part <> 0 AND from part = 0 .
END PROC clip;
INT PROC part (INT CONST x, y):
INT VAR index :: 0;
IF x > x max
THEN set bit (index, 0)
ELIF x < x min
THEN set bit (index, 1) FI;
IF y > y max
THEN set bit (index, 2)
ELIF y < y min
THEN set bit (index, 3) FI;
index
END PROC part;
PROC intersection (INT CONST from x, from y, to x, to y, to part, INT VAR x, y):
SELECT to part OF
CASE 1: right side
CASE 2: left side
CASE 4: up side
CASE 5: upright side
CASE 6: upleft side
CASE 8: down side
CASE 9: downright side
CASE 10: downleft side
OTHERWISE errorstop ("wrong partno.:" + text (to part)) ENDSELECT .
right side:
y := from y + int (real (x max-from x)*(dy/dx));
x := x max .
left side:
y := from y + int (real (x min-from x)*(dy/dx));
x := x min .
up side:
x := from x + int (real (y max-from y)*(dx/dy));
y := y max .
down side:
x := from x + int (real (y min-from y)*(dx/dy));
y := y min .
upright side:
right side;
IF y > y max
THEN up side FI .
downright side:
right side;
IF y < y min
THEN down side FI .
upleft side:
left side;
IF y > y max
THEN up side FI .
downleft side:
left side;
IF y < y min
THEN down side FI .
dx: real (to x-from x) .
dy: real (to y-from y) .
END PROC intersection;
END PACKET clipping;
PACKET thick line DEFINES thick: (*Autor: Heiko Indenbirken *)
(*Stand: 02.07.85/15:07 *)
(*Änderung: 05.08.86/15:52 *)
PROC thick (INT CONST x0, y0, x1, y1, thick,
PROC (INT CONST, INT CONST, INT CONST, INT CONST) line):
IF is point
THEN draw point
ELIF is horizontal line
THEN horizontal line (PROC (INT CONST, INT CONST, INT CONST, INT CONST) line,
x0, y0, x1, y1, thick)
ELSE vertical line (PROC (INT CONST, INT CONST, INT CONST, INT CONST) line,
x0, y0, x1, y1, thick)
FI .
is point:
x0 = x1 AND y0 = y1 .
is horizontal line:
abs (x0-x1) >= abs (y0-y1) .
draw point:
INT VAR i;
FOR i FROM -thick UPTO thick
REP line (x0-thick, y0+i, x0+thick, y0+i) PER .
END PROC thick;
PROC horizontal line (PROC (INT CONST, INT CONST, INT CONST, INT CONST) line,
INT CONST from x, from y, to x, to y, thick):
IF from x > to x
THEN horizontal line (PROC (INT CONST, INT CONST, INT CONST, INT CONST) line,
to x, to y, from x, from y, thick)
ELSE draw line FI .
draw line:
INT VAR i;
calculate increase;
calculate limit points;
FOR i FROM -thick UPTO thick
REP calculate delta x;
line (x start+delta x, y start+i, x end+delta x, y end+i)
PER .
calculate increase:
REAL VAR increase :: -dy / dx .
calculate limit points:
INT CONST x start :: from x - thick,
x end :: to x + thick,
y start :: from y + int (increase * real (thick)),
y end :: to y - int (increase * real (thick)) .
calculate delta x:
INT CONST delta x :: int (increase*real (i)) .
dx: real (to x-from x) .
dy: real (to y-from y) .
END PROC horizontal line;
PROC vertical line (PROC (INT CONST, INT CONST, INT CONST, INT CONST) line,
INT CONST from x, from y, to x, to y, thick):
IF from y > to y
THEN vertical line (PROC (INT CONST, INT CONST, INT CONST, INT CONST) line,
to x, to y, from x, from y, thick)
ELSE draw line FI .
draw line:
INT VAR i;
calculate increase;
calculate limit points;
FOR i FROM -thick UPTO thick
REP calculate delta y;
line (x start+i, y start+delta y, x end+i, y end+delta y)
PER .
calculate increase:
REAL VAR increase :: -dx / dy .
calculate limit points:
INT CONST x start :: from x + int (increase * real (thick)),
x end :: to x - int (increase * real (thick)),
y start :: from y - thick,
y end :: to y + thick .
calculate delta y:
INT CONST delta y :: int (increase*real (i)) .
dx: real (to x-from x) .
dy: real (to y-from y) .
END PROC vertical line;
END PACKET thick line;
PACKET graphik text DEFINES draw char, (*Autor: Heiko Indenbirken *)
zeichensatz: (*Stand: 27.06.85/16:03 *)
(*Änderung: 28.06.85/19:06 *)
(*Änderung: 05.08.86/16:00 *)
LET ZEICHENSATZ = ROW 255 TEXT;
ZEICHENSATZ VAR zeichen;
INT CONST char x :: 6, char y :: 10;
zeichensatz ("ZEICHENSATZ");
PROC zeichensatz (TEXT CONST name):
IF exists (name)
THEN BOUND ZEICHENSATZ VAR new zeichen :: old (name);
zeichen := new zeichen;
ELSE errorstop ("Der Zeichensatz """ + name + """ existiert nicht") FI
END PROC zeichensatz;
PROC draw char (INT CONST char no, INT CONST x, y, x size, y size, direction,
PROC (INT CONST, INT CONST, INT CONST, INT CONST) line):
TEXT CONST character :: zeichen [char no];
INT VAR n :: 1, x0, y0, x1, y1;
INT CONST len :: length (character);
WHILE n < len
REP value (character, n, x0, y0, x1, y1);
transform (x0, y0, x, y, x size, y size, direction);
transform (x1, y1, x, y, x size, y size, direction);
line (x0, y0, x1, y1);
n INCR 4
PER .
END PROC draw char;
PROC value (TEXT CONST char, INT CONST n, INT VAR x0, y0, x1, y1):
x0 := val (code (char SUB n)); y0 := val (code (char SUB n+1));
x1 := val (code (char SUB n+2)); y1 := val (code (char SUB n+3));
END PROC value;
INT PROC val (INT CONST n):
IF n > 127
THEN -256 OR n
ELSE n FI
END PROC val;
PROC transform (INT VAR x, y, INT CONST x0, y0, x size, y size, direction):
INT CONST old x :: x, old y :: y;
SELECT direction OF
CASE 0: x := x0 + x vektor; y := y0 + y vektor
CASE 1: x := x0 - y vektor; y := y0 + x vektor
CASE 2: x := x0 - x vektor; y := y0 - y vektor
CASE 3: x := x0 + y vektor; y := y0 - x vektor
ENDSELECT .
x vektor:
IF x size = 0
THEN old x
ELSE (old x*x size) DIV char x FI .
y vektor:
IF y size = 0
THEN old y
ELSE (old y*y size) DIV char y FI .
END PROC transform;
END PACKET graphik text;
PACKET graphik text DEFINES draw text: (*Autor: Heiko Indenbirken *)
(*Stand: 03.07.85/11:55 *)
(*Änderung: 05.08.86/16:04 *)
PROC draw text (INT CONST x pos, y pos,
TEXT CONST msg, REAL CONST angle, INT CONST height, width,
PROC (INT CONST, INT CONST,
INT CONST, INT CONST, INT CONST, INT CONST) draw char):
INT CONST dir :: int (((angle MOD 360.0)+45.0) / 90.0);
INT VAR i;
REAL VAR x :: real (x pos), y :: real (y pos),
x step :: cosd (angle)*real (width),
y step :: sind (angle)*real (width);
FOR i FROM 1 UPTO length (msg)
REP IF control char
THEN execute control char
ELSE execute normal char FI
PER .
control char:
akt char < ""32"" .
execute control char:
SELECT code (akt char) OF
CASE 1: home
CASE 2: right
CASE 3: up
CASE 7: out (""7"")
CASE 8: left
CASE 10: down
CASE 13: return
ENDSELECT .
home:
x := real (x pos);
y := real (y pos) .
right:
x INCR x step; y INCR y step .
up:
x INCR y step; y INCR x step .
left:
x DECR x step; y DECR y step .
down:
x DECR y step; y DECR x step .
return:
x := real (x pos) .
execute normal char:
draw char (code (akt char), dir, int (x+0.5), int (y+0.5), height, width);
x INCR x step;
y INCR y step .
akt char:
msg SUB i .
END PROC draw text;
END PACKET graphik text;
PACKET comercial plot DEFINES bar, (*Autor: Heiko Indenbirken *)
circle: (*Stand: 03.04.1985 *)
(*Änderung: 03.07.85/15:37 *)
PROC bar (INT CONST from x, from y, to x, to y, pattern,
PROC (INT CONST, INT CONST, INT CONST, INT CONST) line):
IF from x > to x
THEN bar (to x, from y, from x, to y, pattern, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
ELIF from y > to y
THEN bar (from x, to y, to x, from y, pattern, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
ELSE draw frame;
fill frame with pattern
FI .
draw frame:
line (from x, from y, from x, to y);
line (from x, to y, to x, to y);
line (to x, to y, to x, from y);
line (to x, from y, from x, from y) .
fill frame with pattern:
SELECT pattern OF
CASE 1: fill right (from x, to x, from y, to y, 2, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
CASE 2: fill hor (from x, to x, from y, to y, 1, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
CASE 3: fill hor (from x, to x, from y, to y, 5, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
CASE 4: fill vert (from x, to x, from y, to y, 5, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
CASE 5: fill hor (from x, to x, from y, to y, 5, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line);
fill vert (from x, to x, from y, to y, 5, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
CASE 6: fill right (from x, to x, from y, to y, 5, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
CASE 7: fill left (from x, to x, from y, to y, 5, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
CASE 8: fill right (from x, to x, from y, to y, 5, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line);
fill left (from x, to x, from y, to y, 5, PROC (INT CONST, INT CONST, INT CONST, INT CONST) line)
ENDSELECT .
END PROC bar;
PROC fill hor (INT CONST from x, to x, from y, to y, step,
PROC (INT CONST, INT CONST, INT CONST, INT CONST) line):
INT VAR y :: from y;
REP line (from x, y, to x, y);
y INCR step
UNTIL y > to y PER .
END PROC fill hor;
PROC fill vert (INT CONST from x, to x, from y, to y, step,
PROC (INT CONST, INT CONST, INT CONST, INT CONST) line):
INT VAR x :: from x;
REP line (x, from y, x, to y);
x INCR step
UNTIL x > to x PER .
END PROC fill vert;
PROC fill right (INT CONST from x, to x, from y, to y, step,
PROC (INT CONST, INT CONST, INT CONST, INT CONST) line):
INT CONST width :: to x - from x,
height :: to y - from y,
length :: width + height,
height step :: height + step,
width step :: width + step;
INT VAR t :: step, left :: from x, right :: from x,
lower :: from y, upper :: from y;
(* Ausfüllen von links unten nach rechts oben *)
WHILE t < length
REP calc start point;
calc end point;
line (left, upper, right, lower);
t INCR step
PER .
calc start point:
IF t < height
THEN upper INCR step
ELIF t < height step
THEN left := from x + t - height;
upper := to y
ELSE left INCR step FI .
calc end point:
IF t < width
THEN right INCR step
ELIF t < width step
THEN lower := from y + t - width;
right := to x
ELSE lower INCR step FI .
END PROC fill right;
PROC fill left (INT CONST from x, to x, from y, to y, step,
PROC (INT CONST, INT CONST, INT CONST, INT CONST) line):
INT CONST width :: to x - from x,
height :: to y - from y,
length :: width + height,
height step :: height + step,
width step :: width + step;
INT VAR t :: step, left :: to x, right :: to x,
lower :: from y, upper :: from y;
(* Ausfüllen von rechts unten nach links oben *)
WHILE t < length
REP calc start point;
calc end point;
line (right, upper, left, lower);
t INCR step
PER .
calc start point:
IF t < height
THEN upper INCR step
ELIF t < height step
THEN right := to x - t + height;
upper := to y
ELSE right DECR step FI .
calc end point:
IF t < width
THEN left DECR step
ELIF t < width step
THEN lower := from y + t - width;
left := from x
ELSE lower INCR step FI .
END PROC fill left;
PROC circle (INT CONST x, y, REAL CONST rad, from, to, INT CONST pattern,
PROC (INT CONST, INT CONST, INT CONST, INT CONST) line):
REAL VAR t :: from;
INT VAR last x :: x, last y :: y;
WHILE t <= to
REP calc circle;
draw step;
t INCR 1.0
PER;
line (x rad, y rad, x, y) .
draw step:
IF pattern = 0
THEN line (last x, last y, x rad, y rad);
last x := x rad;
last y := y rad
ELSE line (x, y, x rad, y rad) FI .
calc circle:
INT CONST x rad :: int (cosd (t)*rad+0.5)+x,
y rad :: int (sind (t)*rad+0.5)+y .
END PROC circle;
END PACKET comercial plot;