我是编程的初学者，我想通过使用pygame制作太空侵略者游戏来测试自己所学的知识。但是，只要按住拍摄按钮，我就无法继续使飞船连续拍摄。因此，我尝试复制一些在线代码，但我仍然听不懂。这是我在线获得的代码：
#Arsen Cui
#ICS2O1
#Mr. Radulovic
#Culminating Activity - Space Shooter
import pygame
import random
import math
import os
pygame.init()
length = 900 # Length of window
height = 600 # Height of window
window = pygame.display.set_mode((length,height))
pygame.display.set_caption('Space Shooter')
white = [255, 255, 255]
enemyx = [] # List that stores all of the x-positions of the enemies
enemyy = [] # List that stores all of the y-positions of the enemies
speed = [] # List that stores all of the speeds of the enemies (left or right)
speedlist = [-1, 1] # List storing the choices for the speeds (left or right)
enemymovetimer = 0 # Timer tracking the amount of time the enemy has moved
enemyspawntimer = 0 # Timer tracking the amount of time before spawning more enemies
enemy_increment = 1 # Amount to increase the number of enemies by every 5 seconds
enemyremovelist = [] # List storing all of the enemies that need to be removed
ship = pygame.image.load('players\\player.png') # The spaceship that the player controls
#ship = pygame.transform.scale(ship, (50, 50))
enemy = pygame.image.load('enemies\\enemy.png') # The enemies that the player have to kill
#enemy = pygame.transform.scale(enemy, (50, 50))
background = pygame.image.load('backgrounds\\background.jpg') # The background of the game
background = pygame.transform.scale(background, (900, 600))
osu = pygame.image.load('ammo\\bullet.png') # The bullets that the spaceship shoots
#osu = pygame.transform.scale(osu, (50, 50))
shipx = 375 # Ship x-position
shipy = 500 # Ship y-position
gameover = False # Variable tracking whether the game is over or not
pygame.key.set_repeat(1) # Allows you to hold down a button and have the program be able to do something continuously
bullets = [] # List storing all of the bullet positions
bullets2 = [] # Second list used when removing bullets from the game
bulletspeed = 8 # Speed of the bullets
bulletsremovelist = [] # List storing all of the bullets that need to be removed
shoottimer = 0 # Timer tracking what interval to shoot bullets at
scoretimer = 0 # Timer tracking what your current score is
finalscore = 0 # The score that will be displayed on the screen after the game is over
highscore = 0 # Time tracking what your highscore is
finalhighscore = 0 #The highest score you have achieved so far
shipdirection = 0 # Current direction ship is moving in
shoot = False # Variable tracking whether to shoot bullets or not
num_enemy = 3 # Amount of initial enemies
pygame.mouse.set_visible(False) # Makes the mouse invisible on the screen
font = pygame.font.SysFont("Times New Roman", 25)
displaytext = False # Variable tracking whether to display the score or not
def updateBullets(bullets): # Updates the positions of the bullets on the screen every frame
for i in range(0, len(bullets)):
bullets[i][1] -= bulletspeed
def drawBullets(window, bullets): # Draws the bullets
global osu
for i in range(0, len(bullets)):
window.blit(osu, (bullets[i][0], bullets[i][1]))
def appendEnemy(num_enemy, enemyx, enemyy): # Appends enemy x and y positions to the lists
for i in range(num_enemy):
enemyx.append(random.randint(0, length - 50))
enemyy.append(random.randint(0, height - 500))
def drawEnemy(window, enemyx, enemyy): # Draws the enemies
for i in range(num_enemy):
window.blit(enemy, (enemyx[i], enemyy[i]))
def moveEnemysideways(num_enemy, speed, enemyx): # Moves the enemies sideways
for i in range(num_enemy):
speed.append(random.choice(speedlist))
if speed[i] <= 0: # If the enemy speed is currently negative
enemyx[i] += speed[i] # Move the enemy to the left
if enemyx[i] <= 0: # If the enemy has touched the left side of the screen
speed[i] = -speed[i] # Change the enemy's direction to move to the right
elif speed[i] >= 0: # If the enemy speed is currently positive
enemyx[i] += speed[i] # Move the enemy to the right
if enemyx[i] >= length - 50: # If the enemy has touched the right side of the screen
speed[i] = -speed[i] # Change the enemy's direction to move to the left
def moveEnemyforward(num_enemy, enemyy): # Moves the enemies forward
for i in range(num_enemy):
enemyy[i] += 1
def StartOver(num_enemy): # Restarts the game (Clear all lists, append new positions and speeds for the enemies)
list.clear(enemyx)
list.clear(enemyy)
list.clear(speed)
list.clear(bulletsremovelist)
list.clear(enemyremovelist)
list.clear(bullets)
for i in range(num_enemy):
enemyx.append(random.randint(0, length - 50))
enemyy.append(random.randint(0, height - 500))
speed.append(random.choice(speedlist))
pygame.mixer.music.load('song.mp3')
pygame.mixer.music.play(-1) # Plays background music
#explosion = pygame.mixer.Sound('Explosion.wav')
appendEnemy(num_enemy, enemyx, enemyy) # Appends positions and speeds for the initial 3 enemies at the start
clock = pygame.time.Clock()
quit = False
while not quit:
for event in pygame.event.get():
if event.type == pygame.QUIT:
quit = True
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_w:
shipdirection = "up"
if event.key == pygame.K_s:
shipdirection = "down"
if event.key == pygame.K_d:
shipdirection = "right"
if event.key == pygame.K_a:
shipdirection = "left"
if event.key == pygame.K_SPACE:
shoot = True
elif event.type == pygame.KEYUP:
if event.key == pygame.K_SPACE:
shoot = False
elif event.type == pygame.MOUSEBUTTONDOWN:
for i in range(num_enemy):
if event.button == 1:
if gameover == True: # If the game is over
StartOver(3) # Restart the game, and reset all the timers and variables
enemymovetimer = 0
enemyspawntimer = 0
shoottimer = 0
scoretimer = 0
enemy_increment = 1
num_enemy = 3
displaytext = False
shoot = False
gameover = False
# If the ship has reached the edges of the screen, stop it from moving any further
if shipx > length - 55:
shipx = length - 55
if shipx < 0:
shipx = 0
if shipy > height - 55:
shipy = height - 55
if shipy < 0:
shipy = 0
window.blit(background, (0,0)) # Draws the background
window.blit(ship, (shipx, shipy)) # Draws the ship
# Moves the ship in the specified directions
if shipdirection == "up":
shipy -= 5
if shipdirection == "down":
shipy += 5
if shipdirection == "right":
shipx += 5
if shipdirection == "left":
shipx -= 5
# Sets initial x and y positions for the bullets
bulletx = shipx + 2
bullety = shipy - 35
drawEnemy(window, enemyx, enemyy) # Draws the enemies
if shoot == True: # If the signal has been given to shoot
shoottimer += 1
if shoottimer >= 20: # Every third of a second, shoot a bullet
bullets.append([bulletx, bullety]) # Appends position for bullet
shoottimer = 0 # Resets the shoot timer
for i in range(len(bullets)):
if bullets[i][1] > -20: # If the bullet has not gone past the top of the screen
bullets2.append(bullets[i]) # Append that bullet to the second bullet list
bullets = bullets2 # Removes all bullets that went through the top of the screen
bullets2 = [] # Empties the list
drawBullets(window, bullets) # Draws the bullets
updateBullets(bullets) # Updates the bullets' positions
for j in range(0, len(enemyx)):
for i in range(0, len(bullets)):
if bullets[i][0] <= enemyx[j] + 50 and bullets[i][0] >= enemyx[j] - 30 and bullets[i][1] <= enemyy[j] + 50 \
and bullets[i][1] >= enemyy[j]: # If a bullet has hit an enemy
#explosion.play() # Makes explosion noise
if i in bulletsremovelist: # If the bullet has already been appended to the remove list
pass # Don't append it
elif i not in bulletsremovelist: # If the bullet has not yet been appended to the remove list
bulletsremovelist.append(i) # Append the bullet to the remove list
if j in enemyremovelist: # If the enemy has already been appended to the remove list
pass # Don't append it
elif j not in enemyremovelist: # If the enemy has not yet been appended to the remove list
enemyremovelist.append(j) # Append the enemy to the remove list
if len(bulletsremovelist) > 0: # If there are bullets in the bullet remove list
for i in range(len(bulletsremovelist)):
bullets.pop(bulletsremovelist[i]) # Remove those bullets from the bullets list
bulletsremovelist = [] # Empty the list
if len(enemyremovelist) > 0: # If there are enemies in the enemy remove list
for i in range(len(enemyremovelist)):
# Remove the enemies from the position and speed lists
enemyx.pop(enemyremovelist[i])
enemyy.pop(enemyremovelist[i])
speed.pop(enemyremovelist[i])
num_enemy = len(enemyx) # Updates the amount of enemies
enemyremovelist = [] # Empty the list
enemymovetimer += 1 # Increment the amount of time that has passed to track when to move the enemy
if enemymovetimer >= 1:
if enemymovetimer <= 180: # In the first 3 seconds
moveEnemysideways(num_enemy, speed, enemyx) # Move the enemies sideways
if enemymovetimer >= 181: # After 3 seconds
moveEnemyforward(num_enemy, enemyy) # Move the enemies forward
if enemymovetimer >= 360: # After another 3 seconds
enemymovetimer = 0 # Restart the timer
enemyspawntimer += 1 # Increment the amount of time that has passed before adding more enemies
if enemyspawntimer >= 300: # If 5 seconds have passed
# Append more enemies
num_enemy += enemy_increment
appendEnemy(enemy_increment, enemyx, enemyy)
enemy_increment += 1 # Increase the amount of enemies to be appended every time
num_enemy = len(enemyx) # Update the amount of enemies
enemyspawntimer = 0 # Restart the timer
if displaytext == False: # If the score has not yet been displayed
scoretimer += 1 # Update the current score
for i in range(num_enemy):
if enemyy[i] >= height - 50: # If the enemy has gone past the bottom of the screen
for i in range(num_enemy):
speed[i] = 0 # Stop all the enemies from moving
enemyx[i] = 1000 # Move all the existing enemies off the screen, "deleting" them
displaytext = True # Display the score
if scoretimer > highscore: # If the current score is better than your highscore
# Set the current score to the new highscore
finalhighscore = math.floor(scoretimer / 60)
highscore = scoretimer
finalscore = math.floor(scoretimer / 60) # This is the score converted to seconds
if displaytext == True: # If the signal has been given to display the score
score = font.render(("Score: " + str(finalscore) + " Seconds"), 1, white)
window.blit(score, (50, 200)) # Displays score
highscorelabel = font.render(("Highscore: " + str(finalhighscore) + " Seconds"), 1, white)
window.blit(highscorelabel, (50, 250)) # Displays highscore
label = font.render("Click anywhere on the screen to play again", 1, white)
window.blit(label, (50, 300)) #Displays instructions to restart the game
gameover = True # The game is over
pygame.display.update()
clock.tick(60)
pygame.quit()
您有一个运行以下内容的主循环
# MAINLOOP
if event.type == pygame.KEYDOWN:
# ... some other stuff
if event.key == pygame.K_SPACE:
shoot = True
# ... some other stuff
if event.type == pygame.KEYUP:
# ... some other stuff
if event.key == pygame.K_SPACE:
shoot = False
然后在同一循环中稍后有
if shoot == True: # If the signal has been given to shoot
# ... some stuff to shoot the next bullet
drawBullets(...)