space_invaders_run.py

import pygame
import os
import time
import random

pygame.init()

WIDTH , HEIGHT = 800 , 750 
WIN = pygame.display.set_mode((WIDTH , HEIGHT))
pygame.display.set_caption("Space Invaders")

# Load images
RED_SPACE_SHIP = pygame.image.load(os.path.join(r"assets", "pixel_ship_red_small.png"))
BLUE_SPACE_SHIP = pygame.image.load(os.path.join(r"assets", "pixel_ship_blue_small.png"))
GREEN_SPACE_SHIP = pygame.image.load(os.path.join(r"assets", "pixel_ship_green_small.png"))

# Player player

YELLOW_SPACE_SHIP = pygame.image.load(os.path.join(r"assets", "pixel_ship_yellow.png"))

# Lasers

RED_LASER= pygame.image.load(os.path.join(r"assets", "pixel_laser_red.png"))
BLUE_LASER = pygame.image.load(os.path.join(r"assets", "pixel_laser_blue.png"))
GREEN_LASER = pygame.image.load(os.path.join(r"assets", "pixel_laser_green.png"))
YELLOW_LASER = pygame.image.load(os.path.join(r"assets", "pixel_laser_yellow.png"))
# Background

BG = pygame.transform.scale(pygame.image.load(os.path.join(r"assets", "background-black.png")), (WIDTH , HEIGHT))

class Laser:
    def __init__(self, x, y, img):
        self.x = x
        self.y = y
        self.img = img
        self.mask = pygame.mask.from_surface(self.img)

    def draw(self, window):
        window.blit(self.img, (self.x, self.y))
    
    def move(self, vel):
        self.y += vel

    def off_screen(self, height):
        return not(self.y <= height and self.y >= 0)
    
    def collision(self, obj):
        return collide(self, obj)
class Ship:
    COOLDOWN = 30
    def __init__(self, x , y, health=100):
        self.x = x
        self.y = y
        self.health = health
        self.ship_img = None
        self.laser_img = None
        self.lasers = []
        self.cool_down_counter = 0

    def draw(self, window):
        window.blit(self.ship_img , (self.x , self.y))
        for laser in self.lasers:
            laser.draw(window)

    def move_lasers(self, vel, obj):
        self.cooldown()
        for laser in self.lasers:
            laser.move(vel)
            if laser.off_screen(HEIGHT):
                self.lasers.remove(laser)
            elif laser.collision(obj):
                obj.health -= 10
                self.lasers.remove(laser)
    def get_height(self):
        return self.ship_img.get_height()
    
    def get_width(self):
        return self.ship_img.get_width()

    def shoot(self):
        if self.cool_down_counter == 0:
            laser = Laser(self.x , self.y, self.laser_img)
            self.lasers.append(laser)
            self.cool_down_counter = 1

    def cooldown(self):
        if self.cool_down_counter >= self.COOLDOWN:
            self.cool_down_counter = 0
        elif self.cool_down_counter > 0:
            self.cool_down_counter += 1
class Player(Ship):
    def __init__(self, x, y, health=100):
        super().__init__(x, y, health)
        self.ship_img = YELLOW_SPACE_SHIP
        self.laser_img = YELLOW_LASER
        self.mask = pygame.mask.from_surface(self.ship_img)
        self.max_health = health

    def move_lasers(self, vel, objs):
        self.cooldown()
        hit = False
        for laser in self.lasers:
            laser.move(vel)
            if laser.off_screen(HEIGHT):
                self.lasers.remove(laser)
            else:
                for obj in objs:
                    if laser.collision(obj):
                        objs.remove(obj)
                        if laser in self.lasers:
                            self.lasers.remove(laser)
                            hit = True
        return hit
    def healthbar(self, window):
        pygame.draw.rect(window, (255,0,0), (self.x, self.y + self.ship_img.get_height() + 10 , self.ship_img.get_width(), 10))
        pygame.draw.rect(window, (0,255,0), (self.x, self.y + self.ship_img.get_height() + 10 , (int)(self.ship_img.get_width() * (self.health/self.max_health)), 10))
    
    def draw(self, window):
        super().draw(window)
        self.healthbar(window)
class Enemy(Ship):
    COLOR_MAP = {
        "red" : (RED_SPACE_SHIP, RED_LASER),
        "green" : (GREEN_SPACE_SHIP, GREEN_LASER),
        "blue" : (BLUE_SPACE_SHIP, BLUE_LASER)
    }
    def __init__(self, x, y, color, health=100):
        super().__init__(x, y, health)
        self.ship_img, self.laser_img = self.COLOR_MAP[color]
        self.mask = pygame.mask.from_surface(self.ship_img)

    def move(self, vel):
        self.y += vel

    def shoot(self):
        if self.cool_down_counter == 0:
            laser = Laser(self.x-20 , self.y, self.laser_img)
            self.lasers.append(laser)
            self.cool_down_counter = 1

def collide( obj1, obj2):
    offset_x = obj2.x - obj1.x
    offset_y = obj2.y - obj1.y
    return obj1.mask.overlap(obj2.mask, (offset_x, offset_y)) != None

def main():
    run = True
    FPS = 72
    level = 0
    lives = 5
    score = 0
    main_font = pygame.font.SysFont("comicsansms", 30)
    lost_font = pygame.font.SysFont("comicsansms", 60)
    enemies = []
    wave_length = 5
    enemy_vel = 1
    laser_vel = 10


    player_vel = 7

    player = Player(350,600)
    
    lost = False
    lost_count = 0
    clock = pygame.time.Clock()

    def redraw_window():
        WIN.blit(BG, (0,0))
        
        #draw text
        
        lives_label = main_font.render(f"Lives: {lives}", 1, (255, 255, 255))
        level_label = main_font.render(f"Level: {level}" , 1 , (255,255,255))
        score_label = main_font.render(f"Score: {score}", 1, (255, 255, 255))
        health_label = main_font.render(f"Health: {player.health}", 1, (255, 255, 255))
        WIN.blit(lives_label, (50,10))
        WIN.blit(level_label, (WIDTH- level_label.get_width() - 50, 10))
        WIN.blit(score_label, (WIDTH//2 - score_label.get_width()//2, 10))
        WIN.blit(health_label, (WIDTH//2 - score_label.get_width()//2, 10 + score_label.get_height()))
        
        for enemy in enemies:
            enemy.draw(WIN)

        player.draw(WIN)
        if lost:
            lost_label = lost_font.render("You lost!!", 1, (255,255,255))
            WIN.blit(lost_label, (WIDTH//2 - lost_label.get_width()//2, HEIGHT//2 - 60//2 ))
        pygame.display.update()

    while run:
        clock.tick(FPS)
        redraw_window()
        if lives <= 0 or player.health <= 0:
            lost = True
            lost_count += 1
        if lost:
            if lost_count > FPS*2:
                run = False
            else:
                continue
        if len(enemies) == 0:
            level += 1
            wave_length += 5
            for i in range(wave_length):
                enemy = Enemy(random.randrange(50, WIDTH-100), random.randrange(-1500, -100), random.choice(["red", "blue", "green"]))
                enemies.append(enemy)                
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False
        keys = pygame.key.get_pressed()
        if keys[pygame.K_a] and player.x - player_vel > 0:    # left
            player.x -= player_vel
        if keys[pygame.K_d] and player.x + player_vel + player.get_width() < WIDTH:    # right
            player.x += player_vel
        if keys[pygame.K_w] and player.y - player_vel > 0:    # up
            player.y -= player_vel
        if keys[pygame.K_s] and player.y + player_vel + player.get_height() < HEIGHT:    # down
            player.y += player_vel
        if keys[pygame.K_SPACE]:
            player.shoot()
        for enemy in enemies:
            enemy.move(enemy_vel)
            enemy.move_lasers(laser_vel , player)
            if random.randrange(0, 2*FPS) == 1:
                enemy.shoot()
            if collide(enemy, player):
                player.health -= 10
                enemies.remove(enemy)
            if enemy.y + enemy.get_height() > HEIGHT:
                lives -= 1
                enemies.remove(enemy)
        if player.move_lasers(-laser_vel,  enemies):
            score += 1


def main_menu():
    main()