10 REM *****************************************************
20 REM *                                                   *
30 REM *                   SPACE WAR                       *
40 REM *   For one or two Players on a Graphics Terminal   *
50 REM *                  Jobst Brandt                     *
60 REM *                 Hewlett-Packard                   *
61 REM *                   (01 Apr 82)                     *
65 REM *                                                   *
66 REM *             Modified for the Atari 8-bit          *
67 REM *                 by Gibstov	                   *
68 REM *                   (15 Mar 2015)                   *
80 REM *                                                   *
90 REM *****************************************************
100  DIM C(46),O(21,3),S(16,2),E(8,2),Q(4)
110 DIM N1$(2),P$(1),V$(2),V1(2),A$(10),N$(10),NAM1$(10),NAM2$(10),P1$(10),R1$(10),CH$(6),A1$(10)
115 CH$="BDHS/E"
120 REM  Star locs and size: Xmax=720, Ymax=360, Smax=0, Smin=0
130 DATA  0,0,0,0,10,0,-2,0,0,2,-1,0,3,2,-8,0,-2,-2,-4,0,-4
140 DATA  -2,4,-2,4,0,2,-2,8,0,-3,2,1,0,0,2
145 DATA -2,6,-2,-6,-6,-2,6,-2,2,-6,2,6,6,2,-6,2
150 FOR I=1 TO 4:READ A:Q(I)=A:NEXT I:FOR I=1 TO 16:FOR J=1 TO 2:READ A:S(I,J)=A:NEXT J:NEXT I:FOR I=1 TO 8:FOR J=1 TO 2:READ A:E(I,J)=A:NEXT J:NEXT I
160 GOSUB 2740:G=R1
170 REM  - Q CONTAINS Xlim,Ylim(screen),Distance,Maxsize(stars)
220 M=INT(2*RND(1)+ 1):O = 0
230 N1$ = "9":P$ = "2"
250 GOSUB 2370
270 GR.0
280 F1=0:F2=0:F3=0:V1(1)=20:V1(2)=20
290 POS.2,21:PRINT "(";P$;") One or two players";
300 INPUT A$:P1$ = A$
310 GOSUB 2000: ON R1 GOTO 290,290,290,270,290,2980
320 IF A$ = "" THEN A$ = P$
330 Q=VAL(A$)
340 IF Q <> 1 AND Q <> 2 THEN 290
350 NP=Q
360 P$=STR$(NP)
370 IF NP=2 THEN 400
380 NAM1$="Player":NAM2$= "Enemy"
390  GOTO 470
400 NAM1$="Spock":NAM2$ = "Darth": FOR J=1 TO 2:N$=NAM1$:IF J=2 THEN N$=NAM2$
410  POS.2,21: PRINT "(";N$;")  Name of captain #";J;" ";
420  INPUT A$
430 P1$ = A$: GOSUB 2000
440  IF A$ = "" THEN 460
450 P1$ = A$:GOSUB 2610:IF J=1 THEN NAM1$= R1$:GOTO 460
455 NAM2$=R1$
460  NEXT J
470  POS.2,21: PRINT "(";N1$;") How many stars? (0 to 18): ";
480  INPUT A$
490 P1$ = A$: GOSUB 2000: ON R1 GOTO 280,470,470,470,280,2980
500  IF A$ = "" THEN A$ = N1$
510 N =  VAL (A$)
530 IF ABS(N)<0 OR ABS(N)> 18 THEN 470
540 N1$ =  STR$ (N)
550  REM  O=Black hole
560 O=(N<0)
570 N=ABS(N)
580 Q(4)=INT(10-N/6)
590 Q(3)=INT(Q(2)/3)-N
600 GR.0
610 REM  -------------------- MAKE STARS ---------------------
620 N=N+O
630 FOR I=1 TO N
640 R=0
650 R=R+1
660 IF R>20 THEN I=N+1: NEXT I: GOTO 630
670 O(I,3)=Q(4)
680 REM  -- J: 1 = Xpos, 2 = Ypos, 3 = Mass/Size --
690 FOR J=3 TO 1 STEP  -1
700 O(I,J)=INT((Q(J)-2*O(I,3))*RND(1)+O(I,3))
710 NEXT J
720 FOR J=1 TO I-1:IF J>I-1 THEN 750
730 T=(O(I,3)+O(J,3)+ 10)^2
740 IF (O(I,1)-O(J,1))^2+(O(I,2)-O(J,2))^2 < T THEN NEXT J:GOTO 650
750 NEXT J
760 NEXT I
770 REM  ----------------- PLACE SPACE SHIPS -----------------
780 REM  -- Space ship size = 5 --
790 O(N + 1,3)=5:O(N + 2,3)=5
800 FOR J=1 TO 2
810 T = 40
820 IF J=1 THEN I=.28*Q(1):Q=0:GOTO 840
830 T=-T:I=- .28*Q(1):Q= Q(1)
840 R=0
850 R=R + 1
860 IF R > 20 THEN J = 3: NEXT J: GOTO 630
870 X =  INT(I *  RND (1)) + Q + T
880 Y =  INT((Q(2) - 30) *  RND (1) + 20)
890 FOR K = 1 TO N
900 IF (X - O(K,1))^2+(Y- O(K,2))^2<(O(K,3)*2)^2 THEN NEXT K:GOTO 850
910  NEXT K
920 O(N + J,1) = X
930 O(N + J,2) = Y
940 NEXT J
950 A1$(1) = "0":A1$(2) = "180"
960 IF NP > 1 THEN A$ = N$(1):N$(1) = N$(2):N$(2) = A$
970 REM  -------------------- PLOT STARS ---------------------
980 GR.8: COLOR 1:POKE 710,0
990 Z1=3.14159 * (1 / 180)
1000 FOR I = 0 TO 45
1010 C(I + 1)=COS(I * 10 * Z1)
1020 NEXT I
1030 FOR I = 1 TO N - O
1040 FOR J = 1 TO 37
1050 X=INT(O(I,1) + O(I,3) * C(J) + .5)
1060 Y=INT (O(I,2) - O(I,3) * C(J + 9) + .5)
1070 IF J = 1 THEN PLOT X,Y
1080 DR. X,Y
1090 NEXT J
1110 NEXT I
1130  REM  ------------------ PLOT SPACE SHIPS -----------------
1140 FOR I = 1 TO 2
1150 P1 = O(N + I,1):P2 = O(N + I,2):P4= I:GOSUB 2120
1160 NEXT I
1170 IF A$(1,1) = "I" THEN 1450
1180 GOTO 1210
1190 REM  --------------------- PLAY GAME ---------------------
1200 M=M-INT(M / 2) * 2 + 1
1210 IF NP = 1 THEN M = 1
1220 N$=NAM1$:IF M=2 THEN N$=NAM2$
1240 POS.26,23: PRINT "(";A1$(M);") ";N$;"'s, launch angle: ";
1250 B=20:F1 = 1
1260 INPUT A$
1270 IF A$ = "" THEN A$ = A1$(M)
1280 P1$ = A$: GOSUB 2000: ON R1 GOTO 1240,980,1240,270,1240,2980
1290 A=VAL (A$)
1300 A=-SGN(A)*(ABS(A)-INT(ABS(A)/360)*360)
1310 A1$(M)=STR$(-A)
1320 IF N = 0 THEN 1450
1330 POS.26,23
1335 N$=NAM1$:IF M=2 THEN N$=NAM2$
1340 PRINT "(";V1(M);") ";N$;"'s initial velocity: ";
1350 INPUT A$
1360 IF A$="" THEN A$=STR$(V1(M))
1370 P1$=A$:GOSUB 2000:ON R1 GOTO 1240,980,1330,270,1240,2980
1380 B=VAL(A$)
1390 IF B >= 0 AND B<=20 THEN 1420
1400 POS.26,22: PRINT "Velocity must be from 0 to 20"
1410 GOTO 1330
1420 V1(M)=B
1450 U1=0:U2=0:V1=0:V2=0:F3=0
1460 X=.35*B*COS(A*Z1)
1470 Y=.35*B*SIN(A*Z1)
1480 U=X+O(N+M,1)+8*COS (A*Z1)
1490 V=Y+O(N+M,2)+8*SIN (A*Z1)
1500 P1 = U:P2 = V: GOSUB 2230
1510 IF F2 THEN 1570
1520 REM  ----------------- DRAW ROCKET PATH ------------------
1530 U1 =  INT(U + .5):V1=INT (V + .5)
1540 IF U1<>U2 OR V1<>V2 THEN P1=U1:P2=V1: GOSUB 2290
1550 U2=U1:V2=V1
1560 REM  -- E = Xforce, F = Yforce --
1570 E=0:F=0
1580 FOR J=1 TO N
1590 R5=O(J,1)-U
1600 R6=O(J,2)-V
1610 R4=R5^2+R6^2
1620 R3=SQR(R4)
1630 R2=R5/R3
1640 R1=R6/R3
1650 G=.017*(O(J,3)^3)/R4
1660 E=E+G*R2
1670 F=F+G*R1
1680 NEXT J
1690 X=X+E
1700 Y=Y+F
1710 U=U+X
1720 V=V+Y
1730 REM  ------------------ FIND COLLISIONS ------------------
1740 IF F2 THEN 1790
1750 FOR J = 1 TO N + 2
1755 IF J = N + 1 THEN 1780
1760 IF O AND J = N THEN 1780
1770 IF (U-O(J,1))^2+(V-O(J,2))^2<O(J,3)^2 THEN F1=J:J=N+3:NEXT J:J=F1:GOTO 1880
1780 NEXT J
1790 IF U<-Q(1) OR U>Q(1)*2 OR V<-Q(2) OR V>Q(2)*2 THEN 1200
1800 F2 = (U<0 OR U>Q(1) OR V<0 OR V>Q(2))
1810 REM  -- F2=F3 (no change............) --
1820 REM  -- F2=1  (just went off screen.) --
1830 REM  -- F3=1  (just came onto screen) --
1840 IF F2 = F3 THEN 1510
1850 IF F3 THEN P1=U:P2=V:GOSUB 2230
1860 F3 = F2
1870 GOTO 1510
1880 REM  ------------------ MAKE EXPLOSIONS ------------------
1890 P1 = U + 2:P2 = V + 2: GOSUB 2230
1900 FOR I = 1 TO 8:P1 = E(I,1):P2=E(I,2):GOSUB 2250:NEXT  I
1910 IF J <= N THEN 1200
1920 POS.16,23
1925 N$=NAM1$:IF M=2 THEN N$=NAM2$
1930 PRINT N$;" destroyed ";
1933 N$=NAM1$:IF M=2 THEN N$=NAM2$
1935 PRINT N$;"'s ship!";
1940 PRINT "   (Y) Again? : ";
1950 INPUT A$
1970 IF  A$(1,2) = "//" THEN 2980
1980 A$ =  A$(1,1): IF A$ = "D" OR A$ = "I" THEN 980
1985 IF A$ = "N" OR A$ = "E" THEN 2980
1990 GOTO 270
2000 REM ******************* INPUT ******************* FNC ***
2010 IF LEN(P1$)>1 THEN P1$=P1$(1,1)
2060 IF P1$ = "" THEN R1 = 0: RETURN 
2061 P = 7
2062 P = P - 1: IF P = 0 THEN 2100
2063 IF  CH$(P,P) = P1$ THEN 2080
2064 GOTO 2062
2080 IF  A$(1,2) = "//" THEN P = 6
2090 IF P = 3 THEN  GOSUB 2370
2100 R1 = P: RETURN 
2120 REM **************** MAKE SHIPS ***************** FNS ***
2140 S = (P4-1)*2-1
2150 GOSUB 2230
2160 FOR K=1 TO 16:P1=S(K,1)*S:P2=S(K,2):GOSUB 2250:NEXT K
2210 RETURN 
2230 REM ***************** G CURSOR ****************** FNG$ **
2240 CX = P1:CY = P2: RETURN
2250 REM ***************** DRAW LINE *************************
2260 IF NOT (CX>=0 AND CX<=Q(1) AND CY>=0 AND CY<=Q(2)) THEN 2270
2261 IF NOT (CX+P1>=0 AND CX+P1<=Q(1) AND CY+P2>=0 AND CY+P2<=Q(2)) THEN 2270
2265 PL.CX,CY:DR.CX+P1,CY+P2
2270 CX=CX+P1:CY=CY+P2
2280 RETURN 
2290 IF NOT (CX>=0 AND CX<=Q(1) AND CY>=0 AND CY<=Q(2)) THEN 2300
2291 IF NOT (P1>=0 AND P1<= Q(1) AND P2>=0 AND P2<= Q(2)) THEN 2300
2295 PLOT CX,CY:DR.P1,P2
2300 CX = P1:CY = P2: RETURN 
2370 REM  ******************* HELP ******************** FNH ***
2410 GR.0
2420 PRINT "SPACE WAR ": POS.1,7
2430 PRINT  CHR$(127);"Commands:": PRINT 
2440 PRINT  CHR$(127);"H = Help"
2450 PRINT  CHR$(127);"S = Start"
2460 PRINT  CHR$(127);"D = Display"
2470 PRINT  CHR$(127);"I = Instant replay after hit"
2480 PRINT  CHR$(127);" / or B = Back" 
2490 PRINT  CHR$(127);"// or E = Exit": POS.2,17
2500 PRINT "Negative number of stars gives a BLACK HOLE"
2510 POS.2,19: PRINT "(Y) Are you ready to play? (Y/N): ";
2520 INPUT A$:IF LEN(A$)>2 THEN A$=A$(1,2)
2530 IF A$ > "" THEN A=ASC(A$):A$(1,1)=CHR$(A-32*(A>96 AND A<123))
2540 IF A$ = "N" OR A$ = "E" OR A$ = "//" THEN 2580
2550 IF A$ = "H" THEN 2410
2560 RETURN
2570 RETURN 
2580 GR.0
2590 END 
2610 REM  ************** FUNCTION DOWNSHIFT *********** FNS$ **
2640 M = 0: IF P1$ = "" THEN  RETURN 
2650 FOR I = 1 TO  LEN (P1$)
2660 K= ASC(P1$(I,I))
2670 IF K=32 THEN M = 0
2680 IF K<65 OR K>91 THEN 2710
2690 REM IF M THEN P1$=P1$(1,I-1)+CHR$(K+32)+P1$(I+1)
2700 M = 1
2710 NEXT I
2720 R1$ = P1$: RETURN 
2740 REM  *********** POLL TERMINAL CAPABILITY ******** FNi ***
2750 R1=1:Q(1)=319:Q(2)=159
2760 RETURN 
2970 REM  ******************** EXIT ***************************
2980 IF G THEN  GR.0
3000 END