space-invaders.py

import pygame, os, sys, random
os.chdir("files/spaceinvadersfiles")
pygame.init()

screen = pygame.display.set_mode((600,500))
pygame.display.set_caption("Space Invaders")

shooterimg = pygame.image.load("shooter.png")
bulletimg = pygame.image.load("bullet.png")
alienimg = pygame.image.load("alien1.png")
alienimg2 = pygame.image.load("alien2.png")
heart = pygame.image.load("heart.png")
pygame.display.set_icon(shooterimg)

clock = pygame.time.Clock()

pygame.mixer.init()
pygame.mixer.music.load("bgsong.mp3")
pygame.mixer.music.play(-1)

class spaceship:
    def __init__(self,x,y,vel,initx):
        self.x = x
        self.y = y
        self.vel = vel
        self.initx = initx

    def draw(self):
        screen.blit(alienimg, (int(self.x), int(self.y)) )
        # pygame.draw.rect(screen, (255,0,0), (self.x,self.y,32,32),2)


class spaceship2:
    def __init__(self,x,y,vel,initx):
        self.x = x
        self.y = y
        self.vel = vel
        self.initx = initx

    def draw(self):
        screen.blit(alienimg2, (int(self.x), int(self.y)) )
        # pygame.draw.rect(screen, (255,0,0), (self.x,self.y,32,32),2)


class shooter:
    def __init__(self,x,y):
        self.x = x
        self.y = y
        self.vel = 6
    
    def draw(self):
        screen.blit(shooterimg, (int(self.x), int(self.y)))
        # pygame.draw.rect(screen, (255,0,0), (self.x,self.y,32,32),2)


class bullet:
    def __init__(self,x,y):
        self.x = x+8
        self.y = y-6
        self.vel = 30

    def draw(self):
        screen.blit(bulletimg , (int(self.x), int(self.y)))
        # pygame.draw.rect(screen, (255,0,0), (self.x+4,self.y,8,16),2)


def redraw():
    screen.fill((9, 27, 61))
    player.draw()
    for a in aliens:
        a.draw()
    for b in bullets:
        b.draw()

    #lives
    tempx = 570
    tempy = 10
    global lives
    for i in range(lives):
        screen.blit(heart, (tempx, tempy))
        tempx -= 20 

    # explosion    
    for particle in particles:
        particle[0][0] += particle[1][0]
        particle[0][1] += particle[1][1]
        particle[2] -= 0.1
        pygame.draw.circle(screen, (0,200,0), [ int(particle[0][0]), int(particle[0][1]) ], int(particle[2]))

    for particle in particles:
        if particle[2] <= 0:
            particles.remove(particle)
        
    pygame.display.update()


def lifeHit():
    global lives
    global alienspeed
    font = pygame.font.SysFont('franklingothicheavy', 40)
    tt = str(lives-1) + " lives left"
    text = font.render(tt, 1, (255,0,0))
    screen.blit(text, (180,150))
    pygame.display.update()
    i=0
    while i < 150:
        pygame.time.delay(10)
        i+=1

    if lives > 1:
        lives -= 1
        aliens.clear()
        for i in range(8):
            aliens.append( spaceship2(500/8*(i+1)+5, 30, alienspeed, 500/8*(i+1)+5) )
            aliens.append( spaceship(500/8*(i+1)+5, 70, alienspeed, 500/8*(i+1)+5) )
            aliens.append( spaceship2(500/8*(i+1)+5, 110, alienspeed, 500/8*(i+1)+5) )
        bullets.clear()
    else:
        gameover()


def gameover():
    font = pygame.font.SysFont('franklingothicheavy', 30)
    text1 = font.render('GAME OVER ', 1, (0, 63, 252))
    text2 = font.render('SCORE : '+str(roundno-1), 1, (0, 63, 252))
    screen.blit(text1, (120,210))
    screen.blit(text2, (120,240))
    pygame.display.update()
    i = 0
    while i < 200:
        pygame.time.delay(10)
        i += 1
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
    pygame.quit()


def roundover():
    global alienspeed
    global roundno
    global bullettimertime
    bullettimertime -= 1

    font = pygame.font.SysFont('franklingothicheavy', 60)
    text = font.render('ROUND '+ str(roundno), 1, (0, 63, 252))
    screen.blit(text, (180,210))
    pygame.display.update()

    alienspeed += 1
    roundno += 1
    i = 0
    while i < 200:
        pygame.time.delay(10)
        i += 1
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                i = 301
                pygame.quit()
            
    for i in range(8):
        aliens.append( spaceship2(500/8*(i+1)+5, 30, alienspeed, 500/8*(i+1)+5) )
        aliens.append( spaceship(500/8*(i+1)+5, 70, alienspeed, 500/8*(i+1)+5) )
        aliens.append( spaceship2(500/8*(i+1)+5, 110, alienspeed, 500/8*(i+1)+5) )

# main game

lives = 3
countforincreasingplayerspeed=0
bullettimertime = 12
moveflag = False
movedown = 0
alienspeed = 1
roundno = 1
bullets = []
aliens = []
player = shooter(280,420)
bullettimer = 0

particles = []

run=True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    if len(aliens) == 0:
        player.x = 280
        bullets.clear()
        countforincreasingplayerspeed += 1
        if countforincreasingplayerspeed % 4 == 0:
            player.vel += 2
        roundover()

    if bullettimer > 0:
        bullettimer += 1
    if bullettimer > bullettimertime:
        bullettimer = 0

    
    for b in bullets:
        if b.y > 0:
            b.y -= b.vel
        else:
            if bullets.count(b):
                del bullets[bullets.index(b)]

    for a in aliens:
        if a.y + 40 > player.y:
            lifeHit()

        if a.x + a.vel > a.initx + 40 or a.x + a.vel < a.initx - 40:
            a.vel *= -1
        a.x += a.vel

    if a.x + a.vel > a.initx + 40 or a.x + a.vel < a.initx - 40:
        moveflag = True
    else:
        moveflag = False
    if moveflag:
        movedown += 1
        if movedown == 5:
            moveflag = False
            for a in aliens:
                a.y += 50  
            movedown = 0 
            moveflag = False

    for b in bullets:
        for a in aliens:
            if b.y - 10 <= a.y and b.y - 10 >= a.y - 32:
                if b.x + 12 > a.x and b.x + 4 < a.x + 32:
                    if bullets.count(b):
                        del bullets[bullets.index(b)]
                    
                    for _ in range(10):
                        particles.append([ [a.x + 16, a.y + 16], [random.randint(0, 20) / 10 - 1, random.randint(0, 20) / 10 - 1], random.randint(4,8)])

                    del aliens[aliens.index(a)]


    keys = pygame.key.get_pressed()

    if keys[pygame.K_LEFT] and player.x - player.vel > 0:
        player.x -= player.vel
    elif keys[pygame.K_RIGHT] and player.x + player.vel < 570:
        player.x += player.vel

    if (keys[pygame.K_SPACE] or event.type == pygame.MOUSEBUTTONDOWN) and bullettimer == 0:
        bullets.append(bullet(player.x,player.y))
        bullettimer = 1

    redraw()

    


pygame.quit()