Python - PROJECTS - A SHIP THAT FIRES BULLETS(Rocket)

Python Crash Course

開発環境

• macOS Sierra - Apple (OS)
• Emacs (Text Editor)
• Python 3.6 (プログラミング言語)

Python Crash Course (Eric Matthes (著)、No Starch Press)のPART 2(PROJECTS)、PROJECT 1(ALIEN INVASION)、Chapter 12.(A SHIP THAT FIRES BULLETS)のTRY IT YOURSELF 12-1.(Rocket)(No.6848)を取り組んでみる。

TRY IT YOURSELF 12-1.(Rocket)(No.6848)

コード(Emacs)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import sys
import pygame


class Settings:

    def __init__(self):
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (230, 230, 230)
        self.ship_speed_factor = 10


class Ship:

    def __init__(self, ai_settings, screen):
        self.screen = screen
        self.ai_settings = ai_settings

        self.image = pygame.image.load('cat.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()

        self.rect.centerx = self.screen_rect.centerx
        self.rect.centery = self.screen_rect.centery

        self.centerx = float(self.rect.centerx)
        self.centery = float(self.rect.centery)
        self.moving_right = False
        self.moving_left = False
        self.moving_up = False
        self.moving_down = False

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

    def update(self):
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.centerx += self.ai_settings.ship_speed_factor
        elif self.moving_left and self.rect.left > 0:
            self.centerx -= self.ai_settings.ship_speed_factor
        if self.moving_up and self.rect.top > 0:
            self.centery -= self.ai_settings.ship_speed_factor
        elif (self.moving_down and
              self.rect.bottom < self.screen_rect.bottom):
            self.centery += self.ai_settings.ship_speed_factor
        self.rect.centerx = self.centerx
        self.rect.centery = self.centery


def check_keydown_events(event, ship):
    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_UP:
        ship.moving_up = True
    elif event.key == pygame.K_DOWN:
        ship.moving_down = True


def check_keyup_events(event, ship):
    if event.key == pygame.K_RIGHT:
        ship.moving_right = False
    elif event.key == pygame.K_LEFT:
        ship.moving_left = False
    elif event.key == pygame.K_UP:
        ship.moving_up = False
    elif event.key == pygame.K_DOWN:
        ship.moving_down = False


def check_events(ship):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_keydown_events(event, ship)
        elif event.type == pygame.KEYUP:
            check_keyup_events(event, ship)


def update_screen(ai_settings, screen, ship):
    screen.fill(ai_settings.bg_color)
    ship.blitme()
    pygame.display.flip()


def run_game():
    pygame.init()
    ai_settings = Settings()
    screen = pygame.display.set_mode(
        (ai_settings.screen_width, ai_settings.screen_height))
    ship = Ship(ai_settings, screen)
    while True:
        check_events(ship)
        ship.update()
        update_screen(ai_settings, screen, ship)


if __name__ == '__main__':
    run_game()

入出力結果(Terminal, IPython)

$ ./sample2.py
$