Python realizes spaceship war
The examples in this article share the specific code of python to realize the spaceship war for your reference. The specific content is as follows
In the previous blog post, we realized the snake and tank battle together
200 Line python code to realize the snake game
Effect picture
Hold down the up, down, left, and right buttons to make the snake move
python make tank battle
Effect picture
You can press the up, down, left, and right arrow keys and WSAD to move the tank
Press 0 and j to fire bullets.
The specific code and picture audio source files can be obtained from my GitHub address, welcome to star
Next, let’s implement a spaceship war game
Create spaceship class
import pygame
from pygame.sprite import Sprite
classShip(Sprite):
def __init__(self, ai_settings, screen):"""Initialize the ship, and set its starting position."""super(Ship, self).__init__()
self.screen = screen
self.ai_settings = ai_settings
# Load the ship image, and get its rect.
self.image = pygame.image.load('images/ship.bmp')
self.rect = self.image.get_rect()
self.screen_rect = screen.get_rect()
# Start each newship at the bottom center of the screen.
self.rect.centerx = self.screen_rect.centerx
self.rect.bottom = self.screen_rect.bottom
# Store a decimal value for the ship's center.
self.center =float(self.rect.centerx)
# Movement flags.
self.moving_right = False
self.moving_left = False
def center_ship(self):"""Center the ship on the screen."""
self.center = self.screen_rect.centerx
def update(self):"""Update the ship's position, based on movement flags."""
# Update the ship's center value, not the rect.if self.moving_right and self.rect.right < self.screen_rect.right:
self.center += self.ai_settings.ship_speed_factor
if self.moving_left and self.rect.left 0:
self.center -= self.ai_settings.ship_speed_factor
# Update rect object from self.center.
self.rect.centerx = self.center
def blitme(self):"""Draw the ship at its current location."""
self.screen.blit(self.image, self.rect)
Create settings class
classSettings():"""A class to store all settings for Alien Invasion."""
def __init__(self):"""Initialize the game's static settings."""
# Screen settings.
self.screen_width =1200
self.screen_height =800
self.bg_color =(230,230,230)
# Ship settings.
self.ship_limit =3
# Bullet settings.
self.bullet_width =3
self.bullet_height =15
self.bullet_color =60,60,60
self.bullets_allowed =3
# Alien settings.
self.fleet_drop_speed =10
# How quickly the game speeds up.
self.speedup_scale =1.1
# How quickly the alien point values increase.
self.score_scale =1.5
self.initialize_dynamic_settings()
def initialize_dynamic_settings(self):"""Initialize settings that change throughout the game."""
self.ship_speed_factor =1.5
self.bullet_speed_factor =3
self.alien_speed_factor =1
# Scoring.
self.alien_points =50
# fleet_direction of1 represents right,-1 represents left.
self.fleet_direction =1
def increase_speed(self):"""Increase speed settings and alien point values."""
self.ship_speed_factor *= self.speedup_scale
self.bullet_speed_factor *= self.speedup_scale
self.alien_speed_factor *= self.speedup_scale
self.alien_points =int(self.alien_points * self.score_scale)
Create bullet class
import pygame
from pygame.sprite import Sprite
classBullet(Sprite):"""A class to manage bullets fired from the ship."""
def __init__(self, ai_settings, screen, ship):"""Create a bullet object, at the ship's current position."""super(Bullet, self).__init__()
self.screen = screen
# Create bullet rect at(0,0), then set correct position.
self.rect = pygame.Rect(0,0, ai_settings.bullet_width,
ai_settings.bullet_height)
self.rect.centerx = ship.rect.centerx
self.rect.top = ship.rect.top
# Store a decimal value for the bullet's position.
self.y =float(self.rect.y)
self.color = ai_settings.bullet_color
self.speed_factor = ai_settings.bullet_speed_factor
def update(self):"""Move the bullet up the screen."""
# Update the decimal position of the bullet.
self.y -= self.speed_factor
# Update the rect position.
self.rect.y = self.y
def draw_bullet(self):"""Draw the bullet to the screen."""
pygame.draw.rect(self.screen, self.color, self.rect)
Create game function class
import sys
from time import sleep
import pygame
from bullet import Bullet
from alien import Alien
def check_keydown_events(event, ai_settings, screen, ship, bullets):"""Respond to keypresses."""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(ai_settings, screen, ship, bullets)
elif event.key == pygame.K_q:
sys.exit()
def check_keyup_events(event, ship):"""Respond to key releases."""if event.key == pygame.K_RIGHT:
ship.moving_right = False
elif event.key == pygame.K_LEFT:
ship.moving_left = False
def check_events(ai_settings, screen, stats, sb, play_button, ship, aliens,
bullets):"""Respond to keypresses and mouse events."""for event in pygame.event.get():if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:check_keydown_events(event, ai_settings, screen, ship, bullets)
elif event.type == pygame.KEYUP:check_keyup_events(event, ship)
elif event.type == pygame.MOUSEBUTTONDOWN:
mouse_x, mouse_y = pygame.mouse.get_pos()check_play_button(ai_settings, screen, stats, sb, play_button,
ship, aliens, bullets, mouse_x, mouse_y)
def check_play_button(ai_settings, screen, stats, sb, play_button, ship,
aliens, bullets, mouse_x, mouse_y):"""Start a new game when the player clicks Play."""
button_clicked = play_button.rect.collidepoint(mouse_x, mouse_y)if button_clicked and not stats.game_active:
# Reset the game settings.
ai_settings.initialize_dynamic_settings()
# Hide the mouse cursor.
pygame.mouse.set_visible(False)
# Reset the game statistics.
stats.reset_stats()
stats.game_active = True
# Reset the scoreboard images.
sb.prep_score()
sb.prep_high_score()
sb.prep_level()
sb.prep_ships()
# Empty the list of aliens and bullets.
aliens.empty()
bullets.empty()
# Create a newfleet and center the ship.create_fleet(ai_settings, screen, ship, aliens)
ship.center_ship()
def fire_bullet(ai_settings, screen, ship, bullets):"""Fire a bullet, if limit not reached yet."""
# Create a newbullet, add to bullets group.iflen(bullets)< ai_settings.bullets_allowed:
new_bullet =Bullet(ai_settings, screen, ship)
bullets.add(new_bullet)
def update_screen(ai_settings, screen, stats, sb, ship, aliens, bullets,
play_button):"""Update images on the screen, and flip to the new screen."""
# Redraw the screen, each pass through the loop.
screen.fill(ai_settings.bg_color)
# Redraw all bullets, behind ship and aliens.for bullet in bullets.sprites():
bullet.draw_bullet()
ship.blitme()
aliens.draw(screen)
# Draw the score information.
sb.show_score()
# Draw the play button if the game is inactive.if not stats.game_active:
play_button.draw_button()
# Make the most recently drawn screen visible.
pygame.display.flip()
def update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets):"""Update position of bullets, and get rid of old bullets."""
# Update bullet positions.
bullets.update()
# Get rid of bullets that have disappeared.for bullet in bullets.copy():if bullet.rect.bottom <=0:
bullets.remove(bullet)check_bullet_alien_collisions(ai_settings, screen, stats, sb, ship,
aliens, bullets)
def check_high_score(stats, sb):"""Check to see if there's a new high score."""if stats.score stats.high_score:
stats.high_score = stats.score
sb.prep_high_score()
def check_bullet_alien_collisions(ai_settings, screen, stats, sb, ship,
aliens, bullets):"""Respond to bullet-alien collisions."""
# Remove any bullets and aliens that have collided.
collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)if collisions:for aliens in collisions.values():
stats.score += ai_settings.alien_points *len(aliens)
sb.prep_score()check_high_score(stats, sb)iflen(aliens)==0:
# If the entire fleet is destroyed, start a newlevel.
bullets.empty()
ai_settings.increase_speed()
# Increase level.
stats.level +=1
sb.prep_level()create_fleet(ai_settings, screen, ship, aliens)
def check_fleet_edges(ai_settings, aliens):"""Respond appropriately if any aliens have reached an edge."""for alien in aliens.sprites():if alien.check_edges():change_fleet_direction(ai_settings, aliens)break
def change_fleet_direction(ai_settings, aliens):"""Drop the entire fleet, and change the fleet's direction."""for alien in aliens.sprites():
alien.rect.y += ai_settings.fleet_drop_speed
ai_settings.fleet_direction *=-1
def ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets):"""Respond to ship being hit by alien."""if stats.ships_left 0:
# Decrement ships_left.
stats.ships_left -=1
# Update scoreboard.
sb.prep_ships()else:
stats.game_active = False
pygame.mouse.set_visible(True)
# Empty the list of aliens and bullets.
aliens.empty()
bullets.empty()
# Create a newfleet, and center the ship.create_fleet(ai_settings, screen, ship, aliens)
ship.center_ship()
# Pause.sleep(0.5)
def check_aliens_bottom(ai_settings, screen, stats, sb, ship, aliens,
bullets):"""Check if any aliens have reached the bottom of the screen."""
screen_rect = screen.get_rect()for alien in aliens.sprites():if alien.rect.bottom = screen_rect.bottom:
# Treat this the same asif the ship got hit.ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets)break
def update_aliens(ai_settings, screen, stats, sb, ship, aliens, bullets):"""
Check if the fleet is at an edge,
then update the postions of all aliens in the fleet."""
check_fleet_edges(ai_settings, aliens)
aliens.update()
# Look for alien-ship collisions.if pygame.sprite.spritecollideany(ship, aliens):ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets)
# Look for aliens hitting the bottom of the screen.check_aliens_bottom(ai_settings, screen, stats, sb, ship, aliens, bullets)
def get_number_aliens_x(ai_settings, alien_width):"""Determine the number of aliens that fit in a row."""
available_space_x = ai_settings.screen_width -2* alien_width
number_aliens_x =int(available_space_x /(2* alien_width))return number_aliens_x
def get_number_rows(ai_settings, ship_height, alien_height):"""Determine the number of rows of aliens that fit on the screen."""
available_space_y =(ai_settings.screen_height -(3* alien_height)- ship_height)
number_rows =int(available_space_y /(2* alien_height))return number_rows
def create_alien(ai_settings, screen, aliens, alien_number, row_number):"""Create an alien, and place it in the row."""
alien =Alien(ai_settings, screen)
alien_width = alien.rect.width
alien.x = alien_width +2* alien_width * alien_number
alien.rect.x = alien.x
alien.rect.y = alien.rect.height +2* alien.rect.height * row_number
aliens.add(alien)
def create_fleet(ai_settings, screen, ship, aliens):"""Create a full fleet of aliens."""
# Create an alien, and find number of aliens in a row.
alien =Alien(ai_settings, screen)
number_aliens_x =get_number_aliens_x(ai_settings, alien.rect.width)
number_rows =get_number_rows(ai_settings, ship.rect.height,
alien.rect.height)
# Create the fleet of aliens.for row_number inrange(number_rows):for alien_number inrange(number_aliens_x):create_alien(ai_settings, screen, aliens, alien_number,
row_number)
Main function
import pygame
from pygame.sprite import Group
from settings import Settings
from game_stats import GameStats
from scoreboard import Scoreboard
from button import Button
from ship import Ship
import game_functions as gf
def run_game():
# Initialize pygame, settings, and screen object.
pygame.init()
ai_settings =Settings()
screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))
pygame.display.set_caption("Alien Invasion")
# Make the Play button.
play_button =Button(ai_settings, screen,"Play")
# Create an instance to store game statistics, and a scoreboard.
stats =GameStats(ai_settings)
sb =Scoreboard(ai_settings, screen, stats)
# Set the background color.
bg_color =(230,230,230)
# Make a ship, a group of bullets, and a group of aliens.
ship =Ship(ai_settings, screen)
bullets =Group()
aliens =Group()
# Create the fleet of aliens.
gf.create_fleet(ai_settings, screen, ship, aliens)
# Start the main loop for the game.while True:
gf.check_events(ai_settings, screen, stats, sb, play_button, ship,
aliens, bullets)if stats.game_active:
ship.update()
gf.update_bullets(ai_settings, screen, stats, sb, ship, aliens,
bullets)
gf.update_aliens(ai_settings, screen, stats, sb, ship, aliens,
bullets)
gf.update_screen(ai_settings, screen, stats, sb, ship, aliens,
bullets, play_button)run_game()
Create aliens
import pygame
from pygame.sprite import Sprite
classAlien(Sprite):"""A class to represent a single alien in the fleet."""
def __init__(self, ai_settings, screen):"""Initialize the alien, and set its starting position."""super(Alien, self).__init__()
self.screen = screen
self.ai_settings = ai_settings
# Load the alien image, and set its rect attribute.
self.image = pygame.image.load('images/alien.bmp')
self.rect = self.image.get_rect()
# Start each newalien near the top left of the screen.
self.rect.x = self.rect.width
self.rect.y = self.rect.height
# Store the alien's exact position.
self.x =float(self.rect.x)
def check_edges(self):"""Return True if alien is at edge of screen."""
screen_rect = self.screen.get_rect()if self.rect.right = screen_rect.right:return True
elif self.rect.left <=0:return True
def update(self):"""Move the alien right or left."""
self.x +=(self.ai_settings.alien_speed_factor *
self.ai_settings.fleet_direction)
self.rect.x = self.x
def blitme(self):"""Draw the alien at its current location."""
self.screen.blit(self.image, self.rect)
Create game start button
import pygame.font
classButton():
def __init__(self, ai_settings, screen, msg):"""Initialize button attributes."""
self.screen = screen
self.screen_rect = screen.get_rect()
# Set the dimensions and properties of the button.
self.width, self.height =200,50
self.button_color =(0,255,0)
self.text_color =(255,255,255)
self.font = pygame.font.SysFont(None,48)
# Build the button's rect object, and center it.
self.rect = pygame.Rect(0,0, self.width, self.height)
self.rect.center = self.screen_rect.center
# The button message only needs to be prepped once.
self.prep_msg(msg)
def prep_msg(self, msg):"""Turn msg into a rendered image, and center text on the button."""
self.msg_image = self.font.render(msg, True, self.text_color,
self.button_color)
self.msg_image_rect = self.msg_image.get_rect()
self.msg_image_rect.center = self.rect.center
def draw_button(self):
# Draw blank button, then draw message.
self.screen.fill(self.button_color, self.rect)
self.screen.blit(self.msg_image, self.msg_image_rect)
Create game state class
classGameStats():"""Track statistics for Alien Invasion."""
def __init__(self, ai_settings):"""Initialize statistics."""
self.ai_settings = ai_settings
self.reset_stats()
# Start game in an inactive state.
self.game_active = False
# High score should never be reset.
self.high_score =0
def reset_stats(self):"""Initialize statistics that can change during the game."""
self.ships_left = self.ai_settings.ship_limit
self.score =0
self.level =1
Create a scoreboard
import pygame.font
from pygame.sprite import Group
from ship import Ship
classScoreboard():"""A class to report scoring information."""
def __init__(self, ai_settings, screen, stats):"""Initialize scorekeeping attributes."""
self.screen = screen
self.screen_rect = screen.get_rect()
self.ai_settings = ai_settings
self.stats = stats
# Font settings for scoring information.
self.text_color =(30,30,30)
self.font = pygame.font.SysFont(None,48)
# Prepare the initial score images.
self.prep_score()
self.prep_high_score()
self.prep_level()
self.prep_ships()
def prep_score(self):"""Turn the score into a rendered image."""
rounded_score =int(round(self.stats.score,-1))
score_str ="{:,}".format(rounded_score)
self.score_image = self.font.render(score_str, True, self.text_color,
self.ai_settings.bg_color)
# Display the score at the top right of the screen.
self.score_rect = self.score_image.get_rect()
self.score_rect.right = self.screen_rect.right -20
self.score_rect.top =20
def prep_high_score(self):"""Turn the high score into a rendered image."""
high_score =int(round(self.stats.high_score,-1))
high_score_str ="{:,}".format(high_score)
self.high_score_image = self.font.render(high_score_str, True,
self.text_color, self.ai_settings.bg_color)
# Center the high score at the top of the screen.
self.high_score_rect = self.high_score_image.get_rect()
self.high_score_rect.centerx = self.screen_rect.centerx
self.high_score_rect.top = self.score_rect.top
def prep_level(self):"""Turn the level into a rendered image."""
self.level_image = self.font.render(str(self.stats.level), True,
self.text_color, self.ai_settings.bg_color)
# Position the level below the score.
self.level_rect = self.level_image.get_rect()
self.level_rect.right = self.score_rect.right
self.level_rect.top = self.score_rect.bottom +10
def prep_ships(self):"""Show how many ships are left."""
self.ships =Group()for ship_number inrange(self.stats.ships_left):
ship =Ship(self.ai_settings, self.screen)
ship.rect.x =10+ ship_number * ship.rect.width
ship.rect.y =10
self.ships.add(ship)
def show_score(self):"""Draw score to the screen."""
self.screen.blit(self.score_image, self.score_rect)
self.screen.blit(self.high_score_image, self.high_score_rect)
self.screen.blit(self.level_image, self.level_rect)
# Draw ships.
self.ships.draw(self.screen)
The program operation effect is as follows
Click play
Hold down the arrow keys to move the ship
Press and hold the space bar to fire bullets
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The above is the whole content of this article, I hope it will be helpful to everyone's study.
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