Pygameのインストール

ゲーム開発に必要なライブラリをインストールします。

pip install pygame

プロジェクト構成

• main.py：ゲームのメインループ
• config.py：ゲーム設定
• spaceship.py：プレイヤーの宇宙船
• input_handler.py：イベント処理
• projectile.py：弾の管理

コード例

main.py

import pygame
from input_handler import handle_events
from config import GameSettings
from spaceship import PlayerShip
from pygame.sprite import Group

def start_game():
    pygame.init()
    settings = GameSettings()
    display = pygame.display.set_mode((settings.width, settings.height))
    pygame.display.set_caption("宇宙侵略者")

    player = PlayerShip(settings, display)
    bullets = Group()

    while True:
        handle_events(settings, display, player, bullets)
        player.move()

        for bullet in bullets.copy():
            if bullet.rect.bottom < 0:
                bullets.remove(bullet)

        bullets.update()
        settings.render(display, player, bullets)

if __name__ == "__main__":
    start_game()

spaceship.py

import pygame

class PlayerShip:
    def __init__(self, settings, screen):
        self.screen = screen
        self.settings = settings
        self.image = pygame.image.load('assets/ship.png')
        self.rect = self.image.get_rect()
        self.area = screen.get_rect()

        self.rect.centerx = self.area.centerx
        self.rect.bottom = self.area.bottom
        self.position = float(self.rect.centerx)

        self.moving_right = False
        self.moving_left = False

    def update_position(self):
        if self.moving_right and self.rect.right < self.area.right:
            self.position += self.settings.ship_speed
        if self.moving_left and self.rect.left > 0:
            self.position -= self.settings.ship_speed
        self.rect.centerx = self.position

    def draw(self):
        self.screen.blit(self.image, self.rect)

config.py

class GameSettings:
    def __init__(self):
        self.width = 1000
        self.height = 500
        self.bg_color = (230, 230, 230)
        self.ship_speed = 1.5

        self.bullet_speed = 1
        self.bullet_width = 3
        self.bullet_height = 15
        self.bullet_color = (60, 60, 60)
        self.max_bullets = 3

    def render(self, screen, ship, bullets):
        screen.fill(self.bg_color)
        for bullet in bullets:
            bullet.draw()
        ship.draw()
        pygame.display.flip()

projectile.py

import pygame
from pygame.sprite import Sprite

class Projectile(Sprite):
    def __init__(self, settings, screen, ship):
        super().__init__()
        self.screen = screen
        self.rect = pygame.Rect(0, 0, settings.bullet_width, settings.bullet_height)
        self.rect.centerx = ship.rect.centerx
        self.rect.top = ship.rect.top
        self.y_position = float(self.rect.y)
        self.color = settings.bullet_color
        self.speed = settings.bullet_speed

    def update(self):
        self.y_position -= self.speed
        self.rect.y = self.y_position

    def draw(self):
        pygame.draw.rect(self.screen, self.color, self.rect)

input_handler.py

import sys
import pygame
from projectile import Projectile

def key_down(event, settings, screen, ship, bullets):
    if event.key == pygame.K_RIGHT:
        ship.moving_right = True
    elif event.key == pygame.K_LEFT:
        ship.moving_left = True
    elif event.key == pygame.K_SPACE:
        fire_bullet(settings, screen, ship, bullets)

def key_up(event, ship):
    if event.key == pygame.K_RIGHT:
        ship.moving_right = False
    elif event.key == pygame.K_LEFT:
        ship.moving_left = False

def handle_events(settings, screen, ship, bullets):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            key_down(event, settings, screen, ship, bullets)
        elif event.type == pygame.KEYUP:
            key_up(event, ship)