Tutorial: Donkey Game

'-------------------------------------------------
' Source code for demo game: Donkey.bas
'   Original game concept: IBM (1981)
'-------------------------------------------------
BGCOLOR #000000
DIM title, subtitle, credits, label1, label2, score1, score2, boom AS TEXT
DIM border1 AS RECTANGLE
DIM zone1, zone2 AS ZONE
DIM car, car1, car2, car3, car4 AS IMAGE
DIM donkey, donkey1, donkey2, donkey3, donkey4 AS IMAGE
DIM line1, line2 AS IMAGE
DIM isLeftLane AS BOOLEAN: isLeftLane = true
DIM posLeft, posRight AS INTEGER: posLeft = 215: posRight = 340
DIM posCar, posDonkey AS INTEGER: posCar = 400: posDonkey = 50
DIM scoreDriver, scoreDonkey AS INTEGER: scoreDriver = 0: scoreDonkey = 0
DIM donkeyTimer AS TIMER
DIM donkeyCount AS INTEGER
DIM isCrashed AS BOOLEAN

' Title screen
zone1 = ZONE (0,0)-(640,640)
border1 = RECT (100, 100)-(550, 250), #000000, "fade-in", 1000
COLOR border1, #000000, #55FF55, 3
title = TEXT "DONKEY", (_MIDDLEX, 120), "console3", 120, #55FF55, "fade-in", 1000
WAIT
credits = TEXT "Credits:\noriginal game by IBM (1981)\nremake by D2Soft Technologies (2024)", (_MIDDLEX, 550), "console3", 18, #ffffff, "in-down", 2000
WAIT
SLEEP 500
subtitle = TEXT "Press screen to continue", (_MIDDLEX, 350), "console2", 30, #FFFF55
ANIM subtitle, "blink"
MUSIC "intro_tune"
ON PRESS zone1, startGame, 1

'---------------------  SUBs ---------------------
SUB startGame
  STOP MUSIC
  HIDE border1: HIDE title : HIDE subtitle : HIDE credits
  BGCOLOR #555555 ' Alternative color: #C0EF9E
  LINE (0, 0)-(640,0), #AAAAAA, 10
  LINE (640, 0)-(640,640), #AAAAAA, 10
  LINE (640, 640)-(0,640), #AAAAAA, 10
  LINE (0, 640)-(0,0), #AAAAAA, 10
  RECT (15,15)-(180, 625), #00AAAA  ' Left side road
  RECT (460,15)-(625, 625), #00AAAA ' Right side road
  RECT (40,45)-(150, 75), #555555   ' Left name
  RECT (500,45)-(595, 75), #555555  ' Right name
  RECT (70,90)-(110, 116), #555555   ' Left score
  RECT (525,90)-(565, 116), #555555  ' Right name
  label1 = TEXT "Donkey", (40, 40), "console2", 30, #AAAAAA
  label2 = TEXT "Driver", (500, 40), "console2", 30, #AAAAAA
  score1 = TEXT "0", (75, 90), "console2", 25, #AAAAAA
  score2 = TEXT "0", (530, 90), "console2", 25, #AAAAAA
  LINE (190, 0)-(190,640), #AAAAAA, 3
  LINE (450, 0)-(450,640), #AAAAAA, 3
  line1 = IMAGE "donkey_line", (319, 0)', "hide"  ' To use when an accident
  SOUND "car_start", "no-wait" '"engine_revving", "no-wait"
  car = IMAGE "donkey_car", (posLeft, posCar), "in-down", 2000
  WAIT
  HIDE line1
  line2 = IMAGE "donkey_line_anim", (319, 0)
  donkey = IMAGE "donkey_animal", (0, 0), "offscreen" ' , "in-up", 1000
  boom = TEXT "BOOM!", (0, 0), "console2", 30, #FFFFFF, "offscreen"
  zone2 = ZONE (0,0)-(640,640)
  ON PRESS zone2, changeLane
  ON COLLIDE car, donkey, crash
  MUSIC "speed_up", 30
  restartPlay
END SUB

SUB restartPlay
  posCar = 400     ' Y position of car, increase over time
  donkeyCount = 1
  resetCar
  donkeyTimer = TIMER 200, resetDonkey
  SHOW car
END SUB

SUB resetCar
  udpateCarPos
END SUB

SUB speedCar
  posCar = posCar - 16
  udpateCarPos
END SUB

SUB udpateCarPos
  IF isLeftLane THEN
    MOVE car, (posLeft, posCar)
  ELSE
    MOVE car, (posRight, posCar)
  END IF
END IF

SUB changeLane
  IF NOT isCrashed THEN
    IF isLeftLane THEN
      isLeftLane = FALSE
    ELSE
      isLeftLane = TRUE
    END IF
    SOUND "horn", "no-wait"
    udpateCarPos
  END IF
END IF

SUB updateScore
  SET TEXT score1, STR(scoreDonkey)
  SET TEXT score2, STR(scoreDriver)
END SUB

SUB resetDonkey
   STOP ANIM donkey
   IF RND(1,2) = 1 THEN
     MOVE donkey, (posLeft, posDonkey)
   ELSE
     MOVE donkey, (posRight, posDonkey)
   END IF
   SHOW donkey
   isCrashed = FALSE
   MOVE donkey, "out-down", 2000
   WAIT
   IF NOT isCrashed THEN
     donkeyCount = donkeyCount + 1
     IF donkeyCount = 12 THEN
       playerWins
     ELSE
       speedCar
     END IF
   END IF
END SUB

SUB playerWins
   STOP TIMER donkeyTimer
   scoreDriver = scoreDriver + 1
   SOUND "win"
   WAIT
   updateScore
   restartPlay
END SUB

SUB crash
  isCrashed = TRUE
  STOP TIMER donkeyTimer
  STOP ANIM donkey
  HIDE car
  HIDE donkey
  HIDE line2
  SHOW line1
  MOVE boom, (POSX(car), POSY(car))
  SHOW boom
  SOUND "explosion2", "no-wait"
  car1 = CROP IMAGE "donkey_car", (0, 0)-(40, 62), (POSX(car), POSY(car))
  car2 = CROP IMAGE "donkey_car", (40, 0)-(80, 62), (POSX(car)+40, POSY(car))
  car3 = CROP IMAGE "donkey_car", (0, 62)-(40, 125), (POSX(car), POSY(car)+62)
  car4 = CROP IMAGE "donkey_car", (40, 62)-(80, 125), (POSX(car)+40, POSY(car)+62)
  MOVE car1, (0, 0), 750
  MOVE car2, (640, 0), 750
  MOVE car3, (0, 640), 750
  MOVE car4, (640, 640), 750
  donkey1 = CROP IMAGE "donkey_animal", (0, 0)-(46, 27), (POSX(donkey), POSY(donkey))
  donkey2 = CROP IMAGE "donkey_animal", (46, 0)-(92, 27), (POSX(donkey)+46, POSY(donkey))
  donkey3 = CROP IMAGE "donkey_animal", (0, 27)-(46, 55), (POSX(donkey), POSY(donkey)+27)
  donkey4 = CROP IMAGE "donkey_animal", (46, 27)-(92, 55), (POSX(donkey)+46, POSY(donkey)+27)
  MOVE donkey1, (0, 0), 700
  MOVE donkey2, (640, 0), 700
  MOVE donkey3, (0, 640), 700
  MOVE donkey4, (640, 640), 700
  WAIT
  HIDE car1: HIDE car2: HIDE car3: HIDE car4
  HIDE donkey1: HIDE donkey2: HIDE donkey3: HIDE donkey4
  scoreDonkey = scoreDonkey + 1
  updateScore
  restartPlay
  HIDE line1
  HIDE boom
  SHOW line2
END SUB