; MISC1 (LISTING 2)

MODULE:BYTE st:INT ARRAY 
  jx=[1 1 1 1 1 2 2 2 1 0 0 0 1 1 1 1]
  ,jy=[1 1 1 1 1 2 0 1 1 2 0 1 1 2 0 1]
BYTE ARRAY b="                   "

PROC Setjxjy(BYTE i)
FOR i=0 TO 15 DO jx(i)==-1:jy(i)==-1 OD
RETURN

PROC Pb(BYTE i):b(0)=i:Print(b):RETURN

PROC Wait(CARD w,j)
FOR j=0 TO w DO w==+1:w==-1 OD RETURN

; TRIG
MODULE:BYTE ARRAY Si(91)

PROC SetTrig(BYTE t INT y)
FOR t=0 TO 90 DO y=(t*t)/45
  y=(y*t)/5:y=100*t-y:y==/45:Si(t)=y
OD RETURN

INT FUNC sin(INT t,y):t==MOD 360
IF t<91 THEN y=Si(t)
ELSEIF t<181 THEN y=Si(180-t)
ELSEIF t<271 THEN y=-Si(t-180)
ELSE y=-Si(360-t) FI RETURN(y)

INT FUNC cos(INT t,y):t==MOD 360
IF t<91 THEN y=Si(90-t)
ELSEIF t<181 THEN y=-Si(t-90)
ELSEIF t<271 THEN y=-Si(270-t)
ELSE y=Si(t-270) FI RETURN(y)

; VECTOR 
INT FUNC ABS(INT x)
IF x<0 THEN x=-x FI RETURN(x)

INT FUNC SQR(INT x):INT y
IF x=0 THEN RETURN(0) FI:x=ABS(x):y=0
DO y==+1:IF y*y+y>x THEN RETURN(y) FI OD

INT FUNC Vdot(INT ARRAY v,w):INT x
x=v(0)*w(0):x==+v(1)*w(1)
x==+v(2)*w(2):RETURN(x)

PROC Vprod(INT ARRAY v,w,u)
u(0)=v(1)*w(2):u(0)==-v(2)*w(1)
u(1)=v(2)*w(0):u(1)==-v(0)*w(2)
u(2)=v(0)*w(1):u(2)==-v(1)*w(0)
RETURN

PROC Normize(INT ARRAY v):INT i,j,s
i=ABS(v(0))
j=ABS(v(1)):IF i<j THEN i=j FI
j=ABS(v(2)):IF i<j THEN i=j FI
IF i>100 THEN j=1+i/100
  FOR i=0 TO 2 DO v(i)==/j OD
FI
FOR j=0 TO 1 DO s=Vdot(v,v):s=SQR(s)
  FOR i=0 TO 2 DO v(i)=v(i)*128/s OD
OD RETURN

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