Author Topic: Polybius (Read 6934 times)

pforpond · « **on:** November 13, 2019, 02:05:15 pm »

I wrote a small arcade game based on the fictional game Polybius that terrorised the arcade goers of 1981. The rules are simple, shoot the shapes and avoid letting them hit the bottom of the screen. Don't let the subliminal messages get to you ;)

Code: QB64: [Select]

REM Polybius.
REM By Sinnesloschen.
 
setup:
REM sets up game and loads files
REM error handler
ON ERROR GOTO errorhandler
REM sets screen mode
SCREEN _NEWIMAGE(255, 302, 32)
$RESIZE:ON
_RESIZE ON , _STRETCH
_TITLE "Polybius"
REM launches developer console
'$CONSOLE
'_CONSOLE ON
REM launches timer
RANDOMIZE TIMER
LET itime = TIMER
LET ctime = 0
REM checks data folder exists
IF _DIREXISTS("data\") THEN
    REM nothing :)
ELSE
    ERROR 666
END IF
REM loads and applies font
LET gamefont = _LOADFONT("data\gamefont.ttf", 12)
_FONT gamefont
REM loads image files
LET titledisplay = _LOADIMAGE("data\title.png")
LET titledisplay2 = _LOADIMAGE("data\title2.png")
REM loads audio files
LET titlemusic = _SNDOPEN("data\titlemusic.ogg")
LET bulletfire = _SNDOPEN("data\bullet.ogg")
LET titlesfx = _SNDOPEN("data\titlesfx.ogg")
LET gamestart = _SNDOPEN("data\gamestart.ogg")
LET gameover = _SNDOPEN("data\gameover.ogg")
LET hit = _SNDOPEN("data\hit.ogg")
LET newlevel = _SNDOPEN("data\newlevel.ogg")
LET playerhit = _SNDOPEN("data\playerhit.ogg")
LET playerdeath = _SNDOPEN("data\playerdeath.ogg")
REM sets draw values
LET playership$ = "E5 F5 L10 D10 R10 U10 L10 G10 R20 H10 R10 F10 L20 E10"
LET bullet$ = "U10"
LET triangle$ = "F15 L30 E15"
LET square$ = "R10 U20 L20 D20 R10"
LET diamond$ = "E10 H10 G10 F10"
LET particle$ = "D1"
REM displays loading visuals
DO
    LET temp = INT(RND * 302)
    LINE (0, temp)-(302, temp), &HFF5454FC
    _DELAY 0.05
    LET temp2 = temp2 + 1
    CLS
LOOP UNTIL temp2 >= 20
COLOR &HFF5454FC
_PRINTSTRING ((225 / 2), (302 / 2)), "ROM OK"
_DELAY 2
CLS
GOSUB titlescreen
GOTO playgame
 
timekeeper:
REM keeps game time
LET ctime = (TIMER - itime)
LET ctime = INT(ctime)
IF playinggame = 0 THEN RETURN
REM generates time events
IF nextlevel = 0 THEN
        REM next level
        LET nextlevel = ctime + 40
END IF
IF level > 1 THEN 
        IF nextmessage = 0 THEN
                REM next message
                LET nextmessage = ctime + INT(RND * 60) + 1
        END IF
END IF
REM executes time events
IF nextlevel =< ctime THEN
        REM next level
        LET nextlevel = 0
        CLS
        GOSUB nextlevel
END IF
IF level > 1 THEN
        IF nextmessage =< ctime THEN
                REM next message
                LET nextmessage = 0
                GOSUB subliminalmessage
        END IF
END IF
RETURN
 
subliminalmessage:
REM brainwashing messages
LET messagem = INT(RND * 5) + 1
CLS
IF messagem = 1 THEN LET messagem$ = "CONSUME": LET messagel = 7
IF messagem = 2 THEN LET messagem$ = "OBEY": LET messagel = 4
IF messagem = 3 THEN LET messagem$ = "BE AFRAID": LET messagel = 8
IF messagem = 4 THEN LET messagem$ = "STAY AWAKE": LET messagel = 10
IF messagem = 5 THEN LET messagem$ = "KEEP WORKING": LET messagel = 12
_PRINTSTRING(((225 / 2)-(messagel / 2)), (302 / 2)), messagem$
_DELAY 0.5
CLS
RETURN
 
newvalues:
REM generates values for new game
LET playinggame = 1
LET score = 0
LET health = 100
LET level = 0
LET playerx = (255 / 2)
LET oldplayerx = playerx
LET playery = 290
LET oldplayery = playery
LET fire = 0
LET particle = 0
LET speed = 4
LET frames = 60
REM generates new stars
LET star1x = INT(RND * 255) + 1
LET star1y = INT(RND * 302) + 1
LET star2x = INT(RND * 255) + 1
LET star2y = INT(RND * 302) + 1
LET star3x = INT(RND * 255) + 1
LET star3y = INT(RND * 302) + 1
LET star4x = INT(RND * 255) + 1
LET star4y = INT(RND * 302) + 1
LET star5x = INT(RND * 255) + 1
LET star5y = INT(RND * 302) + 1
LET star6x = INT(RND * 255) + 1
LET star6y = INT(RND * 302) + 1
LET star7x = INT(RND * 255) + 1
LET star7y = INT(RND * 302) + 1
LET star8x = INT(RND * 255) + 1
LET star8y = INT(RND * 302) + 1
LET star9x = INT(RND * 255) + 1
LET star9y = INT(RND * 302) + 1
LET star10x = INT(RND * 255) + 1
LET star10y = INT(RND * 302) + 1
REM generates old stars
LET oldstar1y = star1y
LET oldstar2y = star2y
LET oldstar3y = star3y
LET oldstar4y = star4y
LET oldstar5y = star5y
LET oldstar6y = star6y
LET oldstar7y = star7y
LET oldstar8y = star8y
LET oldstar9y = star9y
LET oldstar10y = star10y
LET oldstar1x = star1x
LET oldstar2x = star2x
LET oldstar3x = star3x
LET oldstar4x = star4x
LET oldstar5x = star5x
LET oldstar6x = star6x
LET oldstar7x = star7x
LET oldstar8x = star8x
LET oldstar9x = star9x
LET oldstar10x = star10x
LET particlelimit = 20
RETURN
 
playgame:
REM new game starts
GOSUB newvalues: REM sets new game values
DO
    LET a$ = UCASE$(INKEY$)
    IF level = 0 THEN GOSUB nextlevel
    GOSUB drawstars
    GOSUB drawhud
    GOSUB drawplayer
    GOSUB drawfire
    GOSUB drawparticle
    GOSUB calcenemy
    GOSUB timekeeper
    GOSUB inputter
    GOSUB objectcollision
    IF health <= 0 THEN GOTO gameover
    'GOSUB devconsole
    _LIMIT frames
LOOP
RETURN
 
gameover:
REM game over sequence
_DELAY 1
PSET (playerx, playery), &HFF000000
DRAW playership$
_SNDPLAY playerdeath: REM plays sound
REM draws particles
LET particle = 1
LET particlex = playerx
LET particley = playery
LET particlec = 1
LET particlelimit = particlelimit * 2
DO
        GOSUB drawparticle
        _LIMIT frames
LOOP UNTIL particle = 0
REM plays game over music
_SNDPLAY gameover
DO
        LET gameovertemp = _SNDPLAYING(gameover)
LOOP UNTIL gameovertemp = 0
CLS
_PRINTSTRING(1, 1), "GAME OVER!"
_PRINTSTRING(1, 15), "SCORE: " + STR$(score)
DO: LOOP UNTIL INKEY$ = " "
GOTO endgame
 
 
drawstars:
REM draws stars
REM erase old stars
IF oldstar1 <> star1y THEN
    REM erase star1
    LINE (oldstar1x, oldstar1y)-(oldstar1x, oldstar1y), &HFF000000
    LET oldstar1y = star1y
    LET oldstar1x = star1x
END IF
IF oldstar2y <> star2y THEN
    REM erase star2
    LINE (oldstar2x, oldstar2y)-(oldstar2x, oldstar2y), &HFF000000
    LET oldstar2y = star2y
    LET oldstar2x = star2x
END IF
IF oldstar3y <> star3y THEN
    REM erase star3
    LINE (oldstar3x, oldstar3y)-(oldstar3x, oldstar3y), &HFF000000
    LET oldstar3y = star3y
    LET oldstar3x = star3x
END IF
IF oldstar4y <> star4y THEN
    REM erase star4
    LINE (oldstar4x, oldstar4y)-(oldstar4x, oldstar4y), &HFF000000
    LET oldstar4y = star4y
    LET oldstar4x = star4x
END IF
IF oldstar5y <> star5y THEN
    REM erase star5
    LINE (oldstar5x, oldstar5y)-(oldstar5x, oldstar5y), &HFF000000
    LET oldstar5y = star5y
    LET oldstar5x = star5x
END IF
IF oldstar6y <> star6y THEN
    REM erase star6
    LINE (oldstar6x, oldstar6y)-(oldstar6x, oldstar6y), &HFF000000
    LET oldstar6y = star6y
    LET oldstar6x = star6x
END IF
IF oldstar7y <> star7y THEN
    REM erase star7
    LINE (oldstar7x, oldstar7y)-(oldstar7x, oldstar7y), &HFF000000
    LET oldstar7y = star7y
    LET oldstar7x = star7x
END IF
IF oldstar8y <> star8y THEN
    REM erase star8
    LINE (oldstar8x, oldstar8y)-(oldstar8x, oldstar8y), &HFF000000
    LET oldstar8y = star8y
    LET oldstar8x = star8x
END IF
IF oldstar9y <> star9y THEN
    REM erase star9
    LINE (oldstar9x, oldstar9y)-(oldstar9x, oldstar9y), &HFF000000
    LET oldstar9y = star9y
    LET oldstar9x = star9x
END IF
IF oldstar10y <> star10y THEN
    REM erase star10
    LINE (oldstar10x, oldstar10y)-(oldstar10x, oldstar10y), &HFF000000
    LET oldstar10y = star10y
    LET oldstar10x = star10x
END IF
REM draw stars
LINE (star1x, star1y)-(star1x, star1y), &HFFFCFCFC
LINE (star2x, star2y)-(star2x, star2y), &HFFFCFCFC
LINE (star3x, star3y)-(star3x, star3y), &HFFFCFCFC
LINE (star4x, star4y)-(star4x, star4y), &HFFFCFCFC
LINE (star5x, star5y)-(star5x, star5y), &HFFFCFCFC
LINE (star6x, star6y)-(star6x, star6y), &HFFFCFCFC
LINE (star7x, star7y)-(star7x, star7y), &HFFFCFCFC
LINE (star8x, star8y)-(star8x, star8y), &HFFFCFCFC
LINE (star9x, star9y)-(star9x, star9y), &HFFFCFCFC
LINE (star10x, star10y)-(star10x, star10y), &HFFFCFCFC
REM calc star movement
LET star1y = star1y + speed / 2
LET star2y = star2y + speed / 2
LET star3y = star3y + speed / 2
LET star4y = star4y + speed / 2
LET star5y = star5y + speed / 2
LET star6y = star6y + speed / 2
LET star7y = star7y + speed / 2
LET star8y = star8y + speed / 2
LET star9y = star9y + speed / 2
LET star10y = star10y + speed / 2
REM keep stars within window
IF star1y > 302 THEN LET star1y = 1: LET star1x = INT(RND * 255) + 1
IF star2y > 302 THEN LET star2y = 1: LET star2x = INT(RND * 255) + 1
IF star3y > 302 THEN LET star3y = 1: LET star3x = INT(RND * 255) + 1
IF star4y > 302 THEN LET star4y = 1: LET star4x = INT(RND * 255) + 1
IF star5y > 302 THEN LET star5y = 1: LET star5x = INT(RND * 255) + 1
IF star6y > 302 THEN LET star6y = 1: LET star6x = INT(RND * 255) + 1
IF star7y > 302 THEN LET star7y = 1: LET star7x = INT(RND * 255) + 1
IF star8y > 302 THEN LET star8y = 1: LET star8x = INT(RND * 255) + 1
IF star9y > 302 THEN LET star9y = 1: LET star9x = INT(RND * 255) + 1
IF star10y > 302 THEN LET star10y = 1: LET star10x = INT(RND * 255) + 1
RETURN
 
nextlevel:
REM increases level / game intro
REM generates level
LET level = level + 1
REM generates player ship location
LET levelship = playery
LET olevelship = levelship
REM plays music
IF level = 1 THEN _SNDPLAY gamestart
IF level > 1 THEN _SNDPLAY newlevel
LET starend = 666: REM temp values
DO
        GOSUB drawstars
    REM erase old player ship
    IF olevelship <> levelship THEN
        PSET (255 / 2, olevelship), &HFF000000
        DRAW playership$
        LET olevelship = levelship
    END IF
    REM draw player ship
    IF health > 75 THEN PSET (255 / 2, levelship), &HFF54FC54
    IF health <= 75 AND health > 25 THEN PSET (255 / 2, levelship), &HFFFCFC54
    IF health <= 25 THEN PSET (255 / 2, levelship), &HFFFC5454
    DRAW playership$
    LET levelship = levelship - speed
    IF levelship < (302 / 2) THEN LET levelship = (302 / 2)
    REM display level text
    COLOR &HFF5454FC
    _PRINTSTRING ((255 / 2) - 8, 10), "LEVEL " + STR$(level)
    _LIMIT frames: REM fps limit
    REM detects when music ends
    IF level = 1 THEN starend = _SNDPLAYING(gamestart)
    IF level > 1 THEN starend = _SNDPLAYING(newlevel)
LOOP UNTIL starend = 0
CLS
RETURN
 
 
drawparticle:
REM draws explopsion particles
IF particle = 0 THEN RETURN: REM return for if particles arent needed
IF particle = 1 THEN
    REM sets up particles
    LET p1x = particlex
    LET p2x = particlex
    LET p3x = particlex
    LET p4x = particlex
    LET p1y = particley
    LET p2y = particley
    LET p3y = particley
    LET p4y = particley
    LET particle = 2
    LET particlemove = 0
    REM sets old values
    LET op1y = p1y
    LET op2y = p2y
    LET op3y = p3y
    LET op4y = p4y
    LET op1x = p1x
    LET op2x = p2x
    LET op3x = p3x
    LET op4x = p4x
END IF
IF particle = 2 THEN
    IF p1x <> op1x THEN
        REM erase old particle 1
        LINE (op1x, op1y)-(op1x, op1y), &HFF000000
        LET op1y = p1y
        LET op1x = p1x
    END IF
    IF p2x <> op2x THEN
        REM erase old particle 2
        LINE (op2x, op2y)-(op2x, op2y), &HFF000000
        LET op2y = p2y
        LET op2x = p2x
    END IF
    IF p3x <> op3x THEN
        REM erase old particle 3
        LINE (op3x, op3y)-(op3x, op3y), &HFF000000
        LET op3y = p3y
        LET op3x = p3x
    END IF
    IF p4x <> op4x THEN
        REM erase old particle 4
        LINE (op4x, op4y)-(op4x, op4y), &HFF000000
        LET op4y = p4y
        LET op4x = p4x
    END IF
    REM draws particles
    IF particlec = 1 THEN
                LINE (p1x, p1y)-(p1x, p1y), &HFFFC54FC
                LINE (p2x, p2y)-(p2x, p2y), &HFFFC54FC
                LINE (p3x, p3y)-(p3x, p3y), &HFFFC54FC
                LINE (p4x, p4y)-(p4x, p4y), &HFFFC54FC
    END IF
    IF particlec = 2 THEN
                LINE (p1x, p1y)-(p1x, p1y), &HFF54FCFC
                LINE (p2x, p2y)-(p2x, p2y), &HFF54FCFC
                LINE (p3x, p3y)-(p3x, p3y), &HFF54FCFC
                LINE (p4x, p4y)-(p4x, p4y), &HFF54FCFC
    END IF
    IF particlec = 3 THEN
                LINE (p1x, p1y)-(p1x, p1y), &HFFFCFC54
                LINE (p2x, p2y)-(p2x, p2y), &HFFFCFC54
                LINE (p3x, p3y)-(p3x, p3y), &HFFFCFC54
                LINE (p4x, p4y)-(p4x, p4y), &HFFFCFC54
    END IF
    REM sets particle values for next
    LET p1x = p1x - 1: LET p1y = p1y - 1
    LET p2x = p2x - 1: LET p2y = p2y + 1
    LET p3x = p3x + 1: LET p3y = p3y - 1
    LET p4x = p4x + 1: LET p4y = p4y + 1
    LET particlemove = particlemove + 1
    IF particlemove >= particlelimit THEN
        REM ends particles
        LET particle = 0
        LINE (p1x, p1y)-(p1x, p1y), &HFF000000
        LINE (p2x, p2y)-(p2x, p2y), &HFF000000
        LINE (p3x, p3y)-(p3x, p3y), &HFF000000
        LINE (p4x, p4y)-(p4x, p4y), &HFF000000
        LINE (op1x, op1y)-(op1x, op1y), &HFF000000
        LINE (op2x, op2y)-(op2x, op2y), &HFF000000
        LINE (op3x, op3y)-(op3x, op3y), &HFF000000
        LINE (op4x, op4y)-(op4x, op4y), &HFF000000
    END IF
END IF
RETURN
 
calcenemy:
REM calculates enemy sprites
FOR x = 1 TO level
    IF x = 1 THEN
        REM enemy 1
        IF etype1 = 0 THEN
            REM generates enemy type and location
            LET etype1 = INT(RND * 3) + 1
            LET enemy1x = INT(RND * 255)
            LET enemy1y = 0
            LET oldenemy1x = enemy1x
            LET oldenemy1y = enemy1y
        END IF
        REM sets draw values
        LET enemy1y = enemy1y + (speed / 4)
        LET drawenemyx = enemy1x
        LET drawenemyy = enemy1y
        LET drawetype = etype1
        LET olddrawenemyx = oldenemy1x
        LET olddrawenemyy = oldenemy1y
        GOSUB drawenemy
        LET oldenemy1y = enemy1y
        IF enemy1y > 302 THEN LET etype1 = 0: GOSUB hurtplayer
    END IF
    IF x = 2 THEN
        REM enemy 2
        IF etype2 = 0 THEN
            REM generates enemy type and location
            LET etype2 = INT(RND * 3) + 1
            LET enemy2x = INT(RND * 255)
            LET enemy2y = 0
            LET oldenemy2x = enemy2x
            LET oldenemy2y = enemy2y
        END IF
        REM sets draw values
        LET enemy2y = enemy2y + (speed / 4)
        LET drawenemyx = enemy2x
        LET drawenemyy = enemy2y
        LET drawetype = etype2
        LET olddrawenemyx = oldenemy2x
        LET olddrawenemyy = oldenemy2y
        GOSUB drawenemy
        LET oldenemy2y = enemy2y
        IF enemy2y > 302 THEN LET etype2 = 0: GOSUB hurtplayer
    END IF
    IF x = 3 THEN
        REM enemy 3
        IF etype3 = 0 THEN
            REM generates enemy type and location
            LET etype3 = INT(RND * 3) + 1
            LET enemy3x = INT(RND * 255)
            LET enemy3y = 0
            LET oldenemy3x = enemy3x
            LET oldenemy3y = enemy3y
        END IF
        REM sets draw values
        LET enemy3y = enemy3y + (speed / 4)
        LET drawenemyx = enemy3x
        LET drawenemyy = enemy3y
        LET drawetype = etype3
        LET olddrawenemyx = oldenemy3x
        LET olddrawenemyy = oldenemy3y
        GOSUB drawenemy
        LET oldenemy3y = enemy3y
        IF enemy3y > 302 THEN LET etype3 = 0: GOSUB hurtplayer
    END IF
    IF x = 4 THEN
        REM enemy 4
        IF etype4 = 0 THEN
            REM generates enemy type and location
            LET etype4 = INT(RND * 3) + 1
            LET enemy4x = INT(RND * 255)
            LET enemy4y = 0
            LET oldenemy4x = enemy4x
            LET oldenemy4y = enemy4y
        END IF
        REM sets draw values
        LET enemy4y = enemy4y + (speed / 4)
        LET drawenemyx = enemy4x
        LET drawenemyy = enemy4y
        LET drawetype = etype4
        LET olddrawenemyx = oldenemy4x
        LET olddrawenemyy = oldenemy4y
        GOSUB drawenemy
        LET oldenemy4y = enemy4y
        IF enemy4y > 302 THEN LET etype4 = 0: GOSUB hurtplayer
    END IF
    IF x = 5 THEN
        REM enemy 5
        IF etype5 = 0 THEN
            REM generates enemy type and location
            LET etype5 = INT(RND * 3) + 1
            LET enemy5x = INT(RND * 255)
            LET enemy5y = 0
            LET oldenemy5x = enemy5x
            LET oldenemy5y = enemy5y
        END IF
        REM sets draw values
        LET enemy5y = enemy5y + (speed / 4)
        LET drawenemyx = enemy5x
        LET drawenemyy = enemy5y
        LET drawetype = etype5
        LET olddrawenemyx = oldenemy5x
        LET olddrawenemyy = oldenemy5y
        GOSUB drawenemy
        LET oldenemy5y = enemy5y
        IF enemy5y > 302 THEN LET etype5 = 0: GOSUB hurtplayer
    END IF
    IF x = 6 THEN
        REM enemy 6
        IF etype6 = 0 THEN
            REM generates enemy type and location
            LET etype6 = INT(RND * 3) + 1
            LET enemy6x = INT(RND * 255)
            LET enemy6y = 0
            LET oldenemy6x = enemy6x
            LET oldenemy6y = enemy6y
        END IF
        REM sets draw values
        LET enemy6y = enemy6y + (speed / 4)
        LET drawenemyx = enemy6x
        LET drawenemyy = enemy6y
        LET drawetype = etype6
        LET olddrawenemyx = oldenemy6x
        LET olddrawenemyy = oldenemy6y
        GOSUB drawenemy
        LET oldenemy6y = enemy6y
        IF enemy6y > 302 THEN LET etype6 = 0: GOSUB hurtplayer
    END IF
    IF x = 7 THEN
        REM enemy 7
        IF etype7 = 0 THEN
            REM generates enemy type and location
            LET etype7 = INT(RND * 3) + 1
            LET enemy7x = INT(RND * 255)
            LET enemy7y = 0
            LET oldenemy7x = enemy7x
            LET oldenemy7y = enemy7y
        END IF
        REM sets draw values
        LET enemy7y = enemy7y + (speed / 4)
        LET drawenemyx = enemy7x
        LET drawenemyy = enemy7y
        LET drawetype = etype7
        LET olddrawenemyx = oldenemy7x
        LET olddrawenemyy = oldenemy7y
        GOSUB drawenemy
        LET oldenemy7y = enemy7y
        IF enemy7y > 302 THEN LET etype7 = 0: GOSUB hurtplayer
    END IF
    IF x = 8 THEN
        REM enemy 8
        IF etype8 = 0 THEN
            REM generates enemy type and location
            LET etype8 = INT(RND * 3) + 1
            LET enemy8x = INT(RND * 255)
            LET enemy8y = 0
            LET oldenemy8x = enemy8x
            LET oldenemy8y = enemy8y
        END IF
        REM sets draw values
        LET enemy8y = enemy8y + (speed / 4)
        LET drawenemyx = enemy8x
        LET drawenemyy = enemy8y
        LET drawetype = etype8
        LET olddrawenemyx = oldenemy8x
        LET olddrawenemyy = oldenemy8y
        GOSUB drawenemy
        LET oldenemy8y = enemy8y
        IF enemy8y > 302 THEN LET etype8 = 0: GOSUB hurtplayer
    END IF
    IF x = 9 THEN
        REM enemy 9
        IF etype9 = 0 THEN
            REM generates enemy type and location
            LET etype9 = INT(RND * 3) + 1
            LET enemy9x = INT(RND * 255)
            LET enemy9y = 0
            LET oldenemy9x = enemy9x
            LET oldenemy9y = enemy9y
        END IF
        REM sets draw values
        LET enemy9y = enemy9y + (speed / 4)
        LET drawenemyx = enemy9x
        LET drawenemyy = enemy9y
        LET drawetype = etype9
        LET olddrawenemyx = oldenemy9x
        LET olddrawenemyy = oldenemy9y
        GOSUB drawenemy
        LET oldenemy9y = enemy9y
        IF enemy9y > 302 THEN LET etype9 = 0: GOSUB hurtplayer
    END IF
    IF x = 10 THEN
        REM enemy 10
        IF etype10 = 0 THEN
            REM generates enemy type and location
            LET etype10 = INT(RND * 3) + 1
            LET enemy10x = INT(RND * 255)
            LET enemy10y = 0
            LET oldenemy10x = enemy10x
            LET oldenemy10y = enemy10y
        END IF
        REM sets draw values
        LET enemy10y = enemy10y + (speed / 4)
        LET drawenemyx = enemy10x
        LET drawenemyy = enemy10y
        LET drawetype = etype10
        LET olddrawenemyx = oldenemy10x
        LET olddrawenemyy = oldenemy10y
        GOSUB drawenemy
        LET oldenemy10y = enemy10y
        IF enemy10y > 302 THEN LET etype10 = 0: GOSUB hurtplayer
    END IF
NEXT x
RETURN
 
hurtplayer:
REM hurts player and removes old enemy
IF drawetype = 1 THEN
    REM remove square
    PSET (drawenemyx, drawenemyy), &HFF000000
    DRAW square$
    LET health = health - 3
END IF
IF drawetype = 2 THEN
    REM remove triangle
    PSET (drawenemyx, drawenemyy), &HFF000000
    DRAW triangle$
    LET health = health - 5
END IF
IF drawetype = 3 THEN
    REM remove diamond
    PSET (drawenemyx, drawenemyy), &HFF000000
    DRAW diamond$
    LET health = health - 10
END IF
REM play sound
_SNDPLAY playerhit
IF health > 0 THEN
        REM particles
        LET particle = 1
        LET particlex = drawenemyx
        LET particley = drawenemyy
        LET particlec = drawetype
        CLS
END IF
RETURN
 
drawenemy:
REM draws enemy sprites
IF drawetype = 1 THEN
    REM square
    IF olddrawenemyy <> drawenemyy THEN
        REM erases old square
        PSET (olddrawenemyx, olddrawenemyy), &HFF000000
        DRAW square$
    END IF
    PSET (drawenemyx, drawenemyy), &HFFFC54FC
    DRAW square$
END IF
IF drawetype = 2 THEN
    REM triangle
    IF olddrawenemyy <> drawenemyy THEN
        REM erases old triangle
        PSET (olddrawenemyx, olddrawenemyy), &HFF000000
        DRAW triangle$
    END IF
    PSET (drawenemyx, drawenemyy), &HFF54FCFC
    DRAW triangle$
END IF
IF drawetype = 3 THEN
    REM diamond
    IF olddrawenemyy <> drawenemyy THEN
        REM erases old diamond
        PSET (olddrawenemyx, olddrawenemyy), &HFF000000
        DRAW diamond$
    END IF
    PSET (drawenemyx, drawenemyy), &HFFFCFC54
    DRAW diamond$
END IF
RETURN
 
errorhandler:
REM handles errors
PRINT "ERROR: "; ERR
PRINT "LINE: "; _ERRORLINE
IF ERR = 666 THEN PRINT "DATA FOLDER NOT FOUND"
PRINT "POLYBIUS WILL NOW CLOSE"
END
 
drawfire:
REM draws bullets
IF fire = 0 THEN RETURN: REM return if no bullets fired
IF fire = 1 THEN
    REM FIRE BULLET
    IF oldfirey <> firey THEN
        REM erases old bullet
        PSET (firex, oldfirey), &HFF000000
        DRAW bullet$
        LET oldfirey = firey
    END IF
    IF health > 75 THEN PSET (firex, firey), &HFF54FC54
        IF health <= 75 AND health > 25 THEN PSET (firex, firey), &HFFFCFC54
        IF health <= 25 THEN PSET (firex, firey), &HFFFC5454
    DRAW bullet$
    LET firey = firey - speed
    IF firey < 12 THEN
        REM ends fire
        LET fire = 0
        PSET (firex, oldfirey), &HFF000000
        DRAW bullet$
    END IF
END IF
RETURN
 
objectcollision:
REM object collision
REM player window boundaries
IF playerx < -4 THEN LET playerx = -4
IF playerx > 249 THEN LET playerx = 249
REM bullet and enemy
FOR x = 1 TO level
    IF x = 1 THEN
        IF firex > enemy1x - 10 AND firex < enemy1x + 10 THEN
            IF firey <= enemy1y THEN
                IF etype1 = 1 THEN LET score = score + 1
                IF etype1 = 2 THEN LET score = score + 3
                IF etype1 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy1x
                LET blowy = oldenemy1y
                LET blowtype = etype1
                LET etype1 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
    IF x = 2 THEN
        IF firex > enemy2x - 10 AND firex < enemy2x + 10 THEN
            IF firey <= enemy2y THEN
                IF etype2 = 1 THEN LET score = score + 1
                IF etype2 = 2 THEN LET score = score + 3
                IF etype2 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy2x
                LET blowy = oldenemy2y
                LET blowtype = etype2
                LET etype2 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
    IF x = 3 THEN
        IF firex > enemy3x - 10 AND firex < enemy3x + 10 THEN
            IF firey <= enemy3y THEN
                IF etype3 = 1 THEN LET score = score + 1
                IF etype3 = 2 THEN LET score = score + 3
                IF etype3 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy3x
                LET blowy = oldenemy3y
                LET blowtype = etype3
                LET etype3 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
    IF x = 4 THEN
        IF firex > enemy4x - 10 AND firex < enemy4x + 10 THEN
            IF firey <= enemy4y THEN
                IF etype4 = 1 THEN LET score = score + 1
                IF etype4 = 2 THEN LET score = score + 3
                IF etype4 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy4x
                LET blowy = oldenemy4y
                LET blowtype = etype4
                LET etype4 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
    IF x = 5 THEN
        IF firex > enemy5x - 10 AND firex < enemy5x + 10 THEN
            IF firey <= enemy5y THEN
                IF etype5 = 1 THEN LET score = score + 1
                IF etype5 = 2 THEN LET score = score + 3
                IF etype5 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy5x
                LET blowy = oldenemy5y
                LET blowtype = etype5
                LET etype5 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
    IF x = 6 THEN
        IF firex > enemy6x - 10 AND firex < enemy6x + 10 THEN
            IF firey <= enemy6y THEN
                IF etype6 = 1 THEN LET score = score + 1
                IF etype6 = 2 THEN LET score = score + 3
                IF etype6 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy6x
                LET blowy = oldenemy6y
                LET blowtype = etype6
                LET etype6 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
    IF x = 7 THEN
        IF firex > enemy7x - 10 AND firex < enemy7x + 10 THEN
            IF firey <= enemy7y THEN
                IF etype7 = 1 THEN LET score = score + 1
                IF etype7 = 2 THEN LET score = score + 3
                IF etype7 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy7x
                LET blowy = oldenemy7y
                LET blowtype = etype7
                LET etype7 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
    IF x = 8 THEN
        IF firex > enemy8x - 10 AND firex < enemy8x + 10 THEN
            IF firey <= enemy8y THEN
                IF etype8 = 1 THEN LET score = score + 1
                IF etype8 = 2 THEN LET score = score + 3
                IF etype8 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy8x
                LET blowy = oldenemy8y
                LET blowtype = etype8
                LET etype8 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
    IF x = 9 THEN
        IF firex > enemy9x - 10 AND firex < enemy9x + 10 THEN
            IF firey <= enemy9y THEN
                IF etype9 = 1 THEN LET score = score + 1
                IF etype9 = 2 THEN LET score = score + 3
                IF etype9 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy9x
                LET blowy = oldenemy9y
                LET blowtype = etype9
                LET etype9 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
    IF x = 10 THEN
        IF firex > enemy10x - 10 AND firex < enemy10x + 10 THEN
            IF firey <= enemy10y THEN
                IF etype10 = 1 THEN LET score = score + 1
                IF etype10 = 2 THEN LET score = score + 3
                IF etype10 = 3 THEN LET score = score + 5
                LET fire = 0
                LET blowx = oldenemy10x
                LET blowy = oldenemy10y
                LET blowtype = etype10
                LET etype10 = 0
                GOSUB blowenemy
            END IF
        END IF
    END IF
NEXT x
RETURN
 
blowenemy:
REM blows up enemy
IF blowtype = 1 THEN
    REM erases old square
    PSET (blowx, blowy), &HFF000000
    DRAW square$
END IF
IF blowtype = 2 THEN
    REM erases old triangle
    PSET (blowx, blowy), &HFF000000
    DRAW triangle$
END IF
IF blowtype = 3 THEN
    REM erases old diamond
    PSET (blowx, blowy), &HFF000000
    DRAW diamond$
END IF
REM erases bullet
PSET (firex, oldfirey), &HFF000000
DRAW bullet$
REM plays hit sound
_SNDPLAY hit
LET particle = 1
LET particlex = blowx
LET particley = blowy
LET particlec = blowtype
RETURN
 
devconsole:
REM developer console
_DEST _CONSOLE
REM console lines go here
 
_DEST 0
RETURN
 
drawplayer:
REM draws player ship
IF oldplayerx <> playerx THEN
    REM removes old player ship
    PSET (oldplayerx, oldplayery), &HFF000000
    DRAW playership$
    LET oldplayerx = playerx
END IF
REM draws new ship
IF health > 75 THEN PSET (playerx, playery), &HFF54FC54
IF health <= 75 AND health > 25 THEN PSET (playerx, playery), &HFFFCFC54
IF health <= 25 THEN PSET (playerx, playery), &HFFFC5454
DRAW playership$
RETURN
 
drawhud:
REM draws the game hud (score and health)
COLOR &HFF5454FC
_PRINTSTRING (1, 1), "HEALTH: " + STR$(health)
_PRINTSTRING (180, 1), "SCORE: " + STR$(score)
REM draws seperator lines
LINE (0, 13)-(302, 13), &HFF5454FC
LINE (0, 15)-(302, 15), &HFF5454FC
RETURN
 
inputter:
REM game input
IF a$ = "Q" THEN GOTO endgame
IF _KEYDOWN(19712) THEN LET playerx = playerx + speed
IF _KEYDOWN(19200) THEN LET playerx = playerx - speed
IF a$ = " " THEN
    IF fire = 0 THEN
        LET fire = 1
        LET firex = playerx + 5
        LET firey = playery + 10
        LET oldfirex = firex
        LET oldfirey = firey
        _SNDPLAY bulletfire
    END IF
END IF
RETURN
 
titlescreen:
REM displays titlescreen
_PUTIMAGE (0, 0)-(255, 302), titledisplay
_SNDPLAY titlemusic
REM displays occasional flashes after music
DO
    IF _SNDPLAYING(titlemusic) = 0 THEN
        IF titletemp = 0 THEN LET titletemp = ctime + 20
        IF titletemp <= ctime THEN
            _SNDLOOP titlesfx
            FOR t = 1 TO 10
                _PUTIMAGE (0, 0)-(255, 302), titledisplay2
                _DELAY 0.1
                _PUTIMAGE (0, 0)-(255, 302), titledisplay
                _DELAY 0.1
            NEXT t
            _SNDSTOP titlesfx
            LET titletemp = ctime + 20
        END IF
    END IF
    GOSUB timekeeper
LOOP WHILE INKEY$ = ""
CLS
_SNDSTOP titlemusic
RETURN
 
endgame:
REM unloads all files from memory and quits game
REM unloads images
_FREEIMAGE titledisplay
_FREEIMAGE titledisplay2
REM unloads audio
_SNDCLOSE titlemusic
_SNDCLOSE bulletfire
_SNDCLOSE titlesfx
_SNDCLOSE hit
_SNDCLOSE gamestart
_SNDCLOSE gameover
_SNDCLOSE newlevel
_SNDCLOSE playerhit
_SNDCLOSE playerdeath
REM Danni Pond
SYSTEM
 

Extract the data file to your QB64 folder then compile. Arrow Keys move. Space fires a bullet. Q quits the game. Hope you all enjoy :)

RhoSigma · « **Reply #1 on:** November 13, 2019, 02:59:23 pm »

https://wiki.qb64.org/wiki/LET

pforpond · « **Reply #2 on:** November 13, 2019, 03:43:47 pm »

Quote from: RhoSigma on November 13, 2019, 02:59:23 pm

http://www.qb64.org/wiki/LET

I disagree. I find LET very useful in distinguishing when values are changing in my code. I'm pretty sure the computers of today can handle the extra bytes.

Lucky_Strikez · « **Reply #3 on:** November 16, 2019, 09:42:51 pm »

Nice work! It's quite entertaining.

bplus · « **Reply #4 on:** November 16, 2019, 10:19:27 pm »

https://www.atlasobscura.com/articles/the-urban-legend-of-the-governments-mindcontrolling-arcade-game

Dang! I thought Polybius meant an unnatural fear of using arrays. ;-))

keybone · « **Reply #5 on:** November 17, 2019, 10:21:24 pm »

Quote from: pforpond on November 13, 2019, 03:43:47 pm

I disagree. I find LET very useful in distinguishing when values are changing in my code. I'm pretty sure the computers of today can handle the extra bytes.

LET might not have any purpose, but it is absolutely rediculous that some people feel the need to tell others not to use it.
LET doesnt make any difference whatsoever, it doesnt make the code any better or any worse.
People should just keep their mouths shut about it, and let people that want to use it do so without any shit talking.
That LET wiki entry is plain opinionated, biased, unprofessional, and insulting to cavemen. It should be reverted back to it's previous state.

keybone · « **Reply #6 on:** November 17, 2019, 10:31:19 pm »

This game is awesome, btw. :)

Lucky_Strikez · « **Reply #7 on:** November 17, 2019, 11:08:08 pm »

Quote from: keybone on November 17, 2019, 10:21:24 pm

LET might not have any purpose, but it is absolutely rediculous that some people feel the need to tell others not to use it.
LET doesnt make any difference whatsoever, it doesnt make the code any better or any worse.
People should just keep their mouths shut about it, and let people that want to use it do so without any shit talking.
That LET wiki entry is plain opinionated, biased, unprofessional, and insulting to cavemen. It should be reverted back to it's previous state.

It's called humor, the wiki is hilarious. It's a joke!

keybone · « **Reply #8 on:** November 17, 2019, 11:48:54 pm »

Quote from: Lucky_Strikez on November 17, 2019, 11:08:08 pm

It's called humor, the wiki is hilarious. It's a joke!

Well my post was serious, except for the insulting to cavemen part which was also a joke.
The fact of the matter is though that people really do criticize for the use of LET which is rediculous.
It's like shut the heck up and mind your own business. If you dont like someone's use of LET then don't use their code.

Btw, I was well aware that the wiki article was a joke...

pforpond · « **Reply #9 on:** November 20, 2019, 10:38:08 am »

Quote from: keybone on November 17, 2019, 10:31:19 pm

This game is awesome, btw. :)

Quote from: Lucky_Strikez on November 16, 2019, 09:42:51 pm

Nice work! It's quite entertaining.

Thank you both :) I'm glad it was able to entertain for a while!

Quote from: bplus on November 16, 2019, 10:19:27 pm

https://www.atlasobscura.com/articles/the-urban-legend-of-the-governments-mindcontrolling-arcade-game

Dang! I thought Polybius meant an unnatural fear of using arrays. ;-))

That's interesting because I always thought it was a Greek historian. I guess the name has many uses :)

bplus · « **Reply #10 on:** November 20, 2019, 11:43:33 am »

I did not know of the historian but thought it cool that an urban legend inspires imagination for creating a game.

I would have "translated" polybius as poly = many + b = be + i = the humble i + us = just us ;-))

Jack002 · « **Reply #11 on:** November 21, 2019, 04:51:52 pm »

Quote from: keybone on November 17, 2019, 11:48:54 pm

Well my post was serious, except for the insulting to cavemen part which was also a joke.
The fact of the matter is though that people really do criticize for the use of LET which is rediculous.
It's like shut the heck up and mind your own business. If you dont like someone's use of LET then don't use their code.

Btw, I was well aware that the wiki article was a joke...

Keybone, I agree with you about the issue with the word LET.
The only value I see is let solves a problem with the EQUAL sign. You were taught in school = means stuff on the left is the same as stuff on the right. Its not an ASSIGNMENT, its a STATEMENT. Enter BASIC. The idea was to have a way to assign value to something.
LET gets that done. Let this thing have this value.
So if you do that a million times, you can drop the LET and keep going, no problem
That can be the only value to LET I can think of. (other than old man syndrome where it was good enough for my dad and his dad, etc etc)

SMcNeill · « **Reply #12 on:** November 21, 2019, 05:01:48 pm »

Quote from: Jack002 on November 21, 2019, 04:51:52 pm

Keybone, I agree with you about the issue with the word LET.
The only value I see is let solves a problem with the EQUAL sign. You were taught in school = means stuff on the left is the same as stuff on the right. Its not an ASSIGNMENT, its a STATEMENT. Enter BASIC. The idea was to have a way to assign value to something.
LET gets that done. Let this thing have this value.
So if you do that a million times, you can drop the LET and keep going, no problem
That can be the only value to LET I can think of. (other than old man syndrome where it was good enough for my dad and his dad, etc etc)

Personally, I’m rather happy to have LET in the language. LET, CALL, and REM are all depreciated, but they’re invaluable tools when I’m debugging or experimenting with long code.

Change one assignment from x = x + 2 to LET x = x + 2, and the code hasn’t changed at all, but I now have an unique search point to quickly navigate to. Same with replacing a ‘ with REM, or using CALL SUB...

They don’t negatively or positively affect our code, so they’re mainly syntax for readability — and that’s a personal preference, just like commenting code. Some folks write pages of comments and documentation; others consider it a waste of time. At the end of the day, it all breaks down to one thing: If it works for you, it works.

Dimster · « **Reply #13 on:** November 22, 2019, 12:28:19 pm »

Wonder if there could some merit to have a "BUT" and maybe a negative version of LET and CALL -

LET x = x + x BUT DON"T LET x = x +2

If x = x +2 then
CALL Subroutine1

If x = x + 2 AND x /x <> 1 then
DON'T CALL Subroutine1

Jack002 · « **Reply #14 on:** November 22, 2019, 04:45:56 pm »

If x = x + 2?
When would this be true?

News:

Author Topic: Polybius (Read 6934 times)

pforpond

Polybius

RhoSigma

Re: Polybius

pforpond

Re: Polybius

Lucky_Strikez

Re: Polybius

bplus

Re: Polybius

keybone

Re: Polybius

keybone

Re: Polybius

Lucky_Strikez

Re: Polybius

keybone

Re: Polybius

pforpond

Re: Polybius

bplus

Re: Polybius

Jack002

Re: Polybius

SMcNeill

Re: Polybius

Dimster

Re: Polybius

Jack002

Re: Polybius