sky_dodge.py

# Import the pygame module
import pygame

import random

# Import pygame.locals for easier access to key coordinates
# Updated to conform to flake8 and black standards
from pygame.locals import (
    RLEACCEL,
    K_UP,
    K_DOWN,
    K_LEFT,
    K_RIGHT,
    K_ESCAPE,
    KEYDOWN,
    QUIT,
)

# Define constants for the screen width and height
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600


# Define a Player object by extending pygame.sprite.Sprite
# The surface drawn on the screen is now an attribute of 'player'
class Player(pygame.sprite.Sprite):
    def __init__(self):
        super(Player, self).__init__()
        self.surf = pygame.image.load("images/jet.png").convert()
        self.surf.set_colorkey((255, 255, 255), RLEACCEL)
        self.rect = self.surf.get_rect()

    # Move the sprite based on user keypresses
    def update(self, pressed_keys):
        if pressed_keys[K_UP]:
            self.rect.move_ip(0, -5)
            move_up_sound.play()
        if pressed_keys[K_DOWN]:
            self.rect.move_ip(0, 5)
            move_down_sound.play()
        if pressed_keys[K_LEFT]:
            self.rect.move_ip(-5, 0)
        if pressed_keys[K_RIGHT]:
            self.rect.move_ip(5, 0)

        # Keep player on the screen
        if self.rect.left < 0:
            self.rect.left = 0
        if self.rect.right > SCREEN_WIDTH:
            self.rect.right = SCREEN_WIDTH
        if self.rect.top <= 0:
            self.rect.top = 0
        if self.rect.bottom >= SCREEN_HEIGHT:
            self.rect.bottom = SCREEN_HEIGHT


class Enemy(pygame.sprite.Sprite):
    def __init__(self):
        super(Enemy, self).__init__()
        self.surf = pygame.image.load("images/missile.png").convert()
        self.surf.set_colorkey((255, 255, 255), RLEACCEL)
        self.rect = self.surf.get_rect(
            center=(
                random.randint(SCREEN_WIDTH + 20, SCREEN_WIDTH + 100),
                random.randint(0, SCREEN_HEIGHT),
            )
        )
        self.speed = random.randint(5, 20)

    def update(self):
        self.rect.move_ip(-self.speed, 0)
        if self.rect.right < 0:
            self.kill()


class Cloud(pygame.sprite.Sprite):
    def __init__(self):
        super(Cloud, self).__init__()
        self.surf = pygame.image.load("images/cloud.png").convert()
        self.surf.set_colorkey((0, 0, 0), RLEACCEL)
        self.rect = self.surf.get_rect(
            center=(
                random.randint(SCREEN_WIDTH + 20, SCREEN_WIDTH + 100),
                random.randint(0, SCREEN_HEIGHT),
            )
        )

    def update(self):
        self.rect.move_ip(-5, 0)
        if self.rect.right < 0:
            self.kill()


# Setup for music and sounds. Defaults are good.
pygame.mixer.init()

# Load and play background music
# Sound source: Chris Bailey - artist Tripnet
# License: https://creativecommons.org/licenses/by/3.0/
pygame.mixer.music.load("sound/Apoxode_-_Electric_1.mp3")
pygame.mixer.music.play(loops=-1)
pygame.mixer.music.set_volume(0.4)

# Load all sound files
move_up_sound = pygame.mixer.Sound("sound/Rising_putter.ogg")
move_down_sound = pygame.mixer.Sound("sound/Falling_putter.ogg")
collision_sound = pygame.mixer.Sound("sound/Collision.ogg")

# Set the base volume for all sounds
move_up_sound.set_volume(0.6)
move_down_sound.set_volume(0.6)
collision_sound.set_volume(1.0)

# Initialize pygame
pygame.init()

screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))

# Create a custom event for adding a new enemy
ADDENEMY = pygame.USEREVENT + 1
pygame.time.set_timer(ADDENEMY, 250)
ADDCLOUD = pygame.USEREVENT + 2
pygame.time.set_timer(ADDCLOUD, 1000)

# Instantiate player. Right now, this is just a rectangle.
player = Player()

# Create groups to hold enemy sprites and all sprites
# - enemies is used for collision detection and position updates
# - all_sprites is used for rendering
enemies = pygame.sprite.Group()
clouds = pygame.sprite.Group()
all_sprites = pygame.sprite.Group()
all_sprites.add(player)

# Setup the clock for a decent framerate
clock = pygame.time.Clock()

# Variable to keep the main loop running
running = True

# Main loop
while running:
    # Look at every event in the queue
    for event in pygame.event.get():

        # Did the user hit a key?
        if event.type == KEYDOWN:
            # Was it the Escape key? If so, stop the loop.
            if event.key == K_ESCAPE:
                running = False

        # Did the user click the window close button? If so, stop the loop.
        elif event.type == QUIT:
            running = False

        # Add a new enemy?
        elif event.type == ADDENEMY:
            # Create the new enemy and add it to sprite groups
            new_enemy = Enemy()
            enemies.add(new_enemy)
            all_sprites.add(new_enemy)

        # Add a new enemy?
        elif event.type == ADDCLOUD:
            # Create the new enemy and add it to sprite groups
            new_cloud = Cloud()
            clouds.add(new_cloud)
            all_sprites.add(new_cloud)

    # Get the set of keys pressed and check for user input
    pressed_keys = pygame.key.get_pressed()

    # Update the player sprite based on user keypresses
    player.update(pressed_keys)

    # Update enemy position
    enemies.update()

    # Update cloud position
    clouds.update()

    # Fill the screen with black
    screen.fill((135, 206, 250))

    # Draw all sprites
    for entity in all_sprites:
        screen.blit(entity.surf, entity.rect)

    # Check if any enemies have collided with the player
    if pygame.sprite.spritecollideany(player, enemies):
        # If so, then remove the player and stop the loop
        player.kill()

        # Stop all other sounds and play collision sound
        move_up_sound.stop()
        move_down_sound.stop()
        pygame.mixer.music.stop()
        pygame.time.delay(50)
        collision_sound.play()
        pygame.time.delay(500)

        # Stop the loop
        running = False

    # Update the display
    pygame.display.flip()

    # Ensure program maintains a rate of 30 frames per second
    clock.tick(30)

# All done! Stop and quit the mixer.
pygame.mixer.quit()