Tank Game - QBasic Source Code

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A simple two-player "action" game. The controls were such that you only pressed buttons to change direction, aim or fire- you didn't have to hold buttons down. This eliminated a problem of many multi-player games where the keyboard input would be "frozen" while one person held down a certain key. There is also a simple computer opponent, with varying degrees of intelligence. It's never real good at hitting you, but it gets really good at dodging your shots.

 

Source Code: 

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'  Press "F5" to play
'
'If the screen flickers too much while you are playing the game, or the game
'goes to fast, make the number after "Flicker.Control =" bigger.  If the game
'goes to slow, make the number smaller.
Flicker.Control = 60000
'Programmed by Jeff Lewis
'
SCREEN 7  '320 x 200
RANDOMIZE TIMER

CLS
LOCATE 10, 1
PRINT "Welcome to"
PRINT
PRINT "          The Tank game."
PRINT
PRINT "Do you need instructions? y/n"

instruct.y.n:
y.n$ = INKEY$
SELECT CASE y.n$
CASE "y"
GOTO instruct
CASE "n"
GOTO start
END SELECT
GOTO instruct.y.n

instruct:
CLS
LOCATE 1, 1
PRINT "The object of the game is to shoot your"
PRINT "opponent.  There are two sets of"
PRINT "controls for each player, one to steer"
PRINT "the tank, and the other to aim the gun."
PRINT "For the blue tank, the buttons i, j, k, "
PRINT "and l steer the tank.  Buttons e, s, d,"
PRINT "and f aim the gun.  Their directions are"
PRINT "in the same layout as the arrow keys."
PRINT "The space bar is his fire button.  For"
PRINT "the white tank, the numeric keypad (make"
PRINT "sure Num Lock is on) steers the tank, "
PRINT "while the arrow keys aim the gun.  For "
PRINT "steering, the tank will go in the"
PRINT "direction of the arrow on the key.  The"
PRINT "0 is his fire button.  If you  are"
PRINT "playing a one player game, you are white"
PRINT "and the computer is blue."
PRINT
PRINT "Note: You can only fire one shell at a"
PRINT "time.  If you try to fire another, your"
PRINT "first shell will disappear."
start:
num.players = 3
PRINT
PRINT "How many players? (1/2) "
WHILE num.players <> 1 AND num.players <> 2
num$ = INKEY$
SELECT CASE num$
CASE "1"
num.players = 1
PRINT "1"
CASE "2"
num.players = 2
PRINT "2"
END SELECT
WEND

IF num.players = 1 THEN
PRINT
PRINT "Easy ,Difficult, Super Hard,"
PRINT "or Impossible? e/d/s/i"
difficulty$ = "0"
WHILE difficulty$ <> "e" AND difficulty$ <> "d" AND difficulty$ <> "s" AND difficulty$ <> "i"
diff$ = INKEY$
SELECT CASE diff$
CASE "e"
difficulty$ = "e"
s.difficulty$ = "e"
PRINT "Easy"
CASE "d"
difficulty$ = "d"
s.difficulty$ = "e"
PRINT "Difficult"
CASE "s"
difficulty$ = "d"
s.difficulty$ = "s"
PRINT "It can be done."
CASE "i"
difficulty$ = "d"
s.difficulty$ = "i"
PRINT "You're in for it, now."
END SELECT
WEND
END IF

PRINT
IF num.players = 2 THEN
PRINT "What is the person's name who will be"
INPUT "driving the blue tank? ", tanka.name$
ELSE
tanka.name$ = "Computer"
computer.duration = 0
computer.time = 0
END IF
PRINT

PRINT "What is the person's name who will be"
INPUT "driving the white tank? ", tankb.name$
PRINT
INPUT "How many rounds do you want to play? ", rounds.limit
rounds = 0
tanka.score = 0
tankb.score = 0
n.y = 1
newround:

IF rounds >= rounds.limit THEN
GOTO finish
END IF

rounds = rounds + 1

tanka.direction$ = "E"
tankb.direction$ = "W"
tanka.aim$ = "E"
tankb.aim$ = "W"
tanka.x = 20
tanka.y = 100
tankb.x = 300
tankb.y = 100
tanka.missile.x = -5000
tanka.missile.y = -5000
tankb.missile.x = -5000
tankb.missile.y = -5000
tanka.missile.direction$ = "0"
tankb.missile.direction$ = "0"

a:

CLS

LINE (tanka.x - 10, tanka.y - 10)-(tanka.x + 10, tanka.y + 10), 9, BF
LINE (tankb.x - 10, tankb.y - 10)-(tankb.x + 10, tankb.y + 10), 15, BF
LINE (tanka.missile.x - 1, tanka.missile.y - 1)-(tanka.missile.x + 1, tanka.missile.y + 1), 15, B
LINE (tankb.missile.x - 1, tankb.missile.y - 1)-(tankb.missile.x + 1, tankb.missile.y + 1), 9, B

COLOR 15
SELECT CASE tanka.aim$
CASE "N"
LINE (tanka.x, tanka.y)-(tanka.x, tanka.y - 10)
CASE "E"
LINE (tanka.x, tanka.y)-(tanka.x + 10, tanka.y)
CASE "S"
LINE (tanka.x, tanka.y)-(tanka.x, tanka.y + 10)
CASE "W"
LINE (tanka.x, tanka.y)-(tanka.x - 10, tanka.y)
END SELECT

COLOR 1
SELECT CASE tankb.aim$
CASE "N"
LINE (tankb.x, tankb.y)-(tankb.x, tankb.y - 10)
CASE "E"
LINE (tankb.x, tankb.y)-(tankb.x + 10, tankb.y)
CASE "S"
LINE (tankb.x, tankb.y)-(tankb.x, tankb.y + 10)
CASE "W"
LINE (tankb.x, tankb.y)-(tankb.x - 10, tankb.y)
END SELECT

FOR count = 1 TO Flicker.Control
NEXT count

SELECT CASE tanka.direction$
CASE "N"
tanka.y = tanka.y - 3
CASE "E"
tanka.x = tanka.x + 3
CASE "S"
tanka.y = tanka.y + 3
CASE "W"
tanka.x = tanka.x - 3
END SELECT

SELECT CASE tankb.direction$
CASE "N"
tankb.y = tankb.y - 3
CASE "E"
tankb.x = tankb.x + 3
CASE "S"
tankb.y = tankb.y + 3
CASE "W"
tankb.x = tankb.x - 3
END SELECT

SELECT CASE tanka.missile.direction$
CASE "N"
tanka.missile.y = tanka.missile.y - 6
CASE "E"
tanka.missile.x = tanka.missile.x + 6
CASE "S"
tanka.missile.y = tanka.missile.y + 6
CASE "W"
tanka.missile.x = tanka.missile.x - 6
END SELECT

SELECT CASE tankb.missile.direction$
CASE "N"
tankb.missile.y = tankb.missile.y - 6
CASE "E"
tankb.missile.x = tankb.missile.x + 6
CASE "S"
tankb.missile.y = tankb.missile.y + 6
CASE "W"
tankb.missile.x = tankb.missile.x - 6
END SELECT

change$ = INKEY$
SELECT CASE change$
CASE "q"
GOTO quit
CASE "p"
WHILE INKEY$ <> " "
WEND

CASE CHR$(0) + "H"
tankb.aim$ = "N"
CASE CHR$(0) + "M"
tankb.aim$ = "E"
CASE CHR$(0) + "P"
tankb.aim$ = "S"
CASE CHR$(0) + "K"
tankb.aim$ = "W"
CASE "8"
tankb.direction$ = "N"
CASE "6"
tankb.direction$ = "E"
CASE "2"
tankb.direction$ = "S"
CASE "4"
tankb.direction$ = "W"
CASE "0"
tankb.missile.direction$ = tankb.aim$
tankb.missile.x = tankb.x
tankb.missile.y = tankb.y
END SELECT

IF num.players = 2 THEN
SELECT CASE change$
CASE "e"
tanka.aim$ = "N"
CASE "f"
tanka.aim$ = "E"
CASE "d"
tanka.aim$ = "S"
CASE "s"
tanka.aim$ = "W"
CASE "i"
tanka.direction$ = "N"
CASE "l"
tanka.direction$ = "E"
CASE "k"
tanka.direction$ = "S"
CASE "j"
tanka.direction$ = "W"
CASE " "
tanka.missile.direction$ = tanka.aim$
tanka.missile.x = tanka.x
tanka.missile.y = tanka.y
END SELECT

ELSE
IF computer.time >= computer.duration THEN
computer.time = 0
computer.duration = INT(19 * RND) + 1
computer.direction = INT(4 * RND) + 1
SELECT CASE computer.direction
CASE 1
tanka.direction$ = "N"
CASE 2
tanka.direction$ = "E"
CASE 3
tanka.direction$ = "S"
CASE 4
tanka.direction$ = "W"
END SELECT
END IF
computer.time = computer.time + 1

SELECT CASE tanka.missile.direction$
CASE "N"
IF (tanka.missile.x < tankb.x + 10) AND (tanka.missile.x > tankb.x - 10) AND (tankb.y - 10 <= tanka.missile.y) THEN
GOTO endselect
ELSE
GOTO newtarget
END IF
CASE "E"
IF (tanka.missile.y < tankb.y + 10) AND (tanka.missile.y > tankb.y - 10) AND (tankb.x + 10 >= tanka.missile.x) THEN
GOTO endselect
ELSE
GOTO newtarget
END IF
CASE "S"
IF (tanka.missile.x < tankb.x + 10) AND (tanka.missile.x > tankb.x - 10) AND (tankb.y + 10 >= tanka.missile.y) THEN
GOTO endselect
ELSE
GOTO newtarget
END IF
CASE "W"
IF (tanka.missile.y < tankb.y + 10) AND (tanka.missile.y > tankb.y - 10) AND (tankb.x - 10 <= tanka.missile.x) THEN
GOTO endselect
ELSE
GOTO newtarget
END IF
END SELECT

newtarget:

IF (tanka.x < tankb.x + 10) AND (tanka.x > tankb.x - 10) AND (tankb.y - 10 <= tanka.y) THEN
tanka.missile.direction$ = "N"
tanka.missile.x = tanka.x
tanka.missile.y = tanka.y
END IF

IF (tanka.y < tankb.y + 10) AND (tanka.y > tankb.y - 10) AND (tankb.x + 10 >= tanka.x) THEN
tanka.missile.direction$ = "E"
tanka.missile.x = tanka.x
tanka.missile.y = tanka.y
END IF

IF (tanka.x < tankb.x + 10) AND (tanka.x > tankb.x - 10) AND (tankb.y + 10 >= tanka.y) THEN
tanka.missile.direction$ = "S"
tanka.missile.x = tanka.x
tanka.missile.y = tanka.y
END IF

IF (tanka.y < tankb.y + 10) AND (tanka.y > tankb.y - 10) AND (tankb.x - 10 <= tanka.x) THEN
tanka.missile.direction$ = "W"
tanka.missile.x = tanka.x
tanka.missile.y = tanka.y
END IF

tanka.aim$ = tanka.missile.direction$

endselect:

IF s.difficulty$ = "s" THEN
direction.num = INT(2 * RND)
SELECT CASE direction.num
CASE 0
direction.e.w$ = "E"
direction.n.s$ = "N"
CASE 1
direction.e.w$ = "W"
direction.n.s$ = "S"
END SELECT

SELECT CASE tanka.direction$
CASE "N"
IF tankb.missile.y < tanka.y AND tankb.missile.direction$ <> "N" AND tankb.missile.direction$ <> "S" THEN
tanka.direction$ = direction.e.w$
END IF
CASE "E"
IF tankb.missile.x > tanka.x AND tankb.missile.direction$ <> "E" AND tankb.missile.direction$ <> "W" THEN
tanka.direction$ = direction.n.s$
END IF
CASE "S"
IF tankb.missile.y > tanka.y AND tankb.missile.direction$ <> "N" AND tankb.missile.direction$ <> "S" THEN
tanka.direction$ = direction.e.w$
END IF
CASE "W"
IF tankb.missile.x < tanka.x AND tankb.missile.direction$ <> "E" AND tankb.missile.direction$ <> "W" THEN
tanka.direction$ = direction.n.s$
END IF
END SELECT
END IF

IF s.difficulty$ = "i" THEN
direction.num = INT(2 * RND)
SELECT CASE direction.num
CASE 0
direction.e.w$ = "E"
direction.n.s$ = "N"
CASE 1
direction.e.w$ = "W"
direction.n.s$ = "S"
END SELECT

SELECT CASE tanka.direction$
CASE "N"
IF tankb.missile.y > tanka.y - 13 AND tankb.missile.y < tanka.y AND tankb.missile.y > 1 AND tankb.missile.y < 200 AND tankb.missile.direction$ <> "N" AND tankb.missile.direction$ <> "S" THEN
tanka.direction$ = direction.e.w$
END IF
CASE "E"
IF tankb.missile.x < tanka.x + 13 AND tankb.missile.x > tanka.x AND tankb.missile.x > 1 AND tankb.missile.x < 320 AND tankb.missile.direction$ <> "E" AND tankb.missile.direction$ <> "W" THEN
tanka.direction$ = direction.n.s$
END IF
CASE "S"
IF tankb.missile.y < tanka.y + 13 AND tankb.missile.y > tanka.y AND tankb.missile.y > 1 AND tankb.missile.y < 200 AND tankb.missile.direction$ <> "N" AND tankb.missile.direction$ <> "S" THEN
tanka.direction$ = direction.e.w$
END IF
CASE "W"
IF tankb.missile.x > tanka.x - 13 AND tankb.missile.x < tanka.x AND tankb.missile.x > 1 AND tankb.missile.x < 320 AND tankb.missile.direction$ <> "E" AND tankb.missile.direction$ <> "W" THEN
tanka.direction$ = direction.n.s$
END IF
END SELECT
END IF


'difficult game - tank changes direction if headed right for a missile headed for him
IF difficulty$ = "d" THEN
direction.num = INT(2 * RND)
SELECT CASE direction.num
CASE 0
direction.e.w$ = "E"
direction.n.s$ = "N"
CASE 1
direction.e.w$ = "W"
direction.n.s$ = "S"
END SELECT

SELECT CASE tankb.missile.direction$

CASE "N"
IF (tankb.missile.x < tanka.x + 10) AND (tankb.missile.x > tanka.x - 10) AND (tanka.y - 10 <= tankb.missile.y) AND (tanka.direction$ <> "E") AND (tanka.direction$ <> "W") THEN
tanka.direction$ = direction.e.w$
END IF

CASE "E"
IF (tankb.missile.y < tanka.y + 10) AND (tankb.missile.y > tanka.y - 10) AND (tanka.x + 10 >= tankb.missile.x) AND (tanka.direction$ <> "N") AND (tanka.direction$ <> "S") THEN
tanka.direction$ = direction.n.s$
END IF

CASE "S"
IF (tankb.missile.x < tanka.x + 10) AND (tankb.missile.x > tanka.x - 10) AND (tanka.y + 10 >= tankb.missile.y) AND (tanka.direction$ <> "E") AND (tanka.direction$ <> "W") THEN
tanka.direction$ = direction.e.w$
END IF

CASE "W"
IF (tankb.missile.y < tanka.y + 10) AND (tankb.missile.y > tanka.y - 10) AND (tanka.x - 10 <= tankb.missile.x) AND (tanka.direction$ <> "N") AND (tanka.direction$ <> "S") THEN
tanka.direction$ = direction.n.s$
END IF

END SELECT

END IF

END IF

IF tanka.x < 1 THEN
tanka.direction$ = "E"
END IF

IF tanka.x > 319 THEN
tanka.direction$ = "W"
END IF

IF tanka.y < 1 THEN
tanka.direction$ = "S"
END IF

IF tanka.y > 199 THEN
tanka.direction$ = "N"
END IF

IF tankb.x < 1 THEN
tankb.direction$ = "E"
END IF

IF tankb.x > 319 THEN
tankb.direction$ = "W"
END IF

IF tankb.y < 1 THEN
tankb.direction$ = "S"
END IF

IF tankb.y > 199 THEN
tankb.direction$ = "N"
END IF

'change direction if tanks hit

IF (tanka.x + 10 >= tankb.x - 10) AND (tanka.y - 10 <= tankb.y + 10) AND (tanka.y + 10 >= tankb.y - 10) AND (tanka.x + 6 < tankb.x - 6) THEN
tanka.direction$ = "W"
tankb.direction$ = "E"
END IF

IF (tankb.x + 10 >= tanka.x - 10) AND (tankb.y - 10 <= tanka.y + 10) AND (tankb.y + 10 >= tanka.y - 10) AND (tankb.x + 6 < tanka.x - 6) THEN
tankb.direction$ = "W"
tanka.direction$ = "E"
END IF

IF (tanka.y + 10 >= tankb.y - 10) AND (tanka.x - 10 <= tankb.x + 10) AND (tanka.x + 10 >= tankb.x - 10) AND (tanka.y + 6 < tankb.y - 6) THEN
tanka.direction$ = "N"
tankb.direction$ = "S"
END IF

IF (tankb.y + 10 >= tanka.y - 10) AND (tankb.x - 10 <= tanka.x + 10) AND (tankb.x + 10 >= tanka.x - 10) AND (tankb.y + 6 < tanka.y - 6) THEN
tankb.direction$ = "N"
tanka.direction$ = "S"
END IF

'target recognition

LOCATE 12, 13

IF (tanka.missile.x > tankb.x - 10) AND (tanka.missile.x < tankb.x + 10) AND (tanka.missile.y > tankb.y - 10) AND (tanka.missile.y < tankb.y + 10) THEN
COLOR 9
PRINT tankb.name$; " got hit."
tanka.score = tanka.score + 1
GOTO new
END IF

IF (tankb.missile.x > tanka.x - 10) AND (tankb.missile.x < tanka.x + 10) AND (tankb.missile.y > tanka.y - 10) AND (tankb.missile.y < tanka.y + 10) THEN
COLOR 15
PRINT tanka.name$; " got hit."
tankb.score = tankb.score + 1
GOTO new
END IF

GOTO a

quit:
finish:
LOCATE 1, 12
IF tanka.score > tankb.score THEN
COLOR 9
PRINT tanka.name$; " wins!"
ELSE
  IF tankb.score > tanka.score THEN
  COLOR 15
  PRINT tankb.name$; " wins!"
  ELSE
  COLOR 12
  PRINT "Tie"
  END IF
END IF
IF n.y = 0 THEN
GOTO gameover
END IF

new:
LOCATE 15, 1
PRINT "Score:"
LOCATE 16, 5
PRINT tanka.name$; "-"; tanka.score; "  "; tankb.name$; "-"; tankb.score
IF change$ = "q" OR rounds >= rounds.limit THEN
n.y = 0
GOTO finish
END IF
LOCATE 17, 12
PRINT "space to continue"
WHILE INKEY$ <> " "
WEND
GOTO newround

gameover:
LOCATE 18, 12
COLOR 12
PRINT "Game Over"
LOCATE 19, 5
PRINT "Do you want to play again? y/n"
again:
y.n$ = INKEY$
SELECT CASE y.n$
CASE "y"
COLOR 15
CLS
GOTO start
CASE "n"
END
END SELECT
GOTO again