我该怎么做才能创造多个敌人实例?

Question

作为初学者，我正在努力在pygame中创建多个敌人。为了做到这一点，我可能会在代码中添加或实现什么?

代码:

# WORK IN PROGRESS!
# I followed techwithtim's tutorial
# I do not own the images and sounds used in game
# TODO Create multiple Enemies
import pygame
import random

# Screen parameters
pygame.init()
screen = pygame.display.set_mode((640, 480))
pygame.display.set_caption("SPPACCE")
bg = pygame.image.load("bg.png")
font = pygame.font.SysFont('comicsans', 30, True)
clock = pygame.time.Clock()
score = 0
# Music & Sound effects
bulletsound = pygame.mixer.Sound('sounds/bullet_soundeffect.wav') 
explosion = pygame.mixer.Sound('sounds/explosion_effect.wav')
explosion2 = pygame.mixer.Sound('sounds/torpedo_explosion.wav')
# Player parameters
class Player(object):
def __init__(self, x, y, height, width):
self.x = x
self.y = y
self.height = height
self.width = width
self.player_vel = 5
def draw(self, screen):
screen.blit(player_char, (self.x, self.y))

# Enemy parameters
class Enemy(object):
def __init__(self, x, y, height, width, end):
self.x = x
self.y = y
self.height = height
self.width = width
self.enemy_vel = 1.5
self.end = end   
self.path = [self.x, self.end]
self.hitbox = (self.x + 17, self.y + 2, 65, 65)
self.health = 5
self.visible = True

def draw(self, screen):
self.move()
if self.visible:
self.hitbox = (self.x + 0, self.y, 65, 65)
pygame.draw.rect(screen, (255, 0, 0), self.hitbox, 2)
screen.blit(enemy_char, (self.x, self.y))
# Health bars
pygame.draw.rect(screen, (0, 0, 0), (self.hitbox[0], self.hitbox[1] - 20, 65, 7))
pygame.draw.rect(screen, (255, 0, 0), (self.hitbox[0], self.hitbox[1] - 20, 65 - (12 * (5 - self.health)), 7))                

def move(self):
if self.enemy_vel > 0:
if self.x < self.path[1] + self.enemy_vel:
self.x += self.enemy_vel
else:
self.enemy_vel = self.enemy_vel * -1
self.x += self.enemy_vel
else:
if self.x > self.path[0] - self.enemy_vel:
self.x += self.enemy_vel
else:
self.enemy_vel = self.enemy_vel * -1
self.x += self.enemy_vel
def hit(self):
if self.health > 0:
self.health -= 1
else: 
self.visible = False
explosion.play()
global score
score += 1    

# Player Projectile parameters
class Projectile(object):
def __init__(self, x, y, color, radius):
self.x = x
self.y = y
self.color = color
self.radius = radius
self.vel = 12.5

def draw(self, screen):
pygame.draw.circle(screen, self.color, (self.x, self.y), self.radius)

# Images
player_char = pygame.image.load('sprites/hotdog.png')
enemy_char = pygame.image.load('sprites/hamburger.png')
def blit(): # This draws the sprites
player.draw(screen)
enemy.draw(screen)
for projectile in projectiles:
projectile.draw(screen)
score_text = font.render("Score: " + str(score), 1, (0, 109, 255))
version = font.render("Version 01 ", 1, (51, 153, 255))
screen.blit(score_text, (0, 0))
screen.blit(version, (520, 0))

shootloop = 0
if shootloop > 0:
shootloop += 1
if shootloop > 2:
shootloop = 0
player = Player(300, 400, 64, 64) 
enemy = Enemy(random.randint(10, 100), random.randint(20, 100), 64, 64, 480)
enemy_count = random.randint(1, 10)
projectiles = []
run = True

while run:
clock.tick(60)
screen.fill((0, 0, 0))
screen.blit(bg, (0, 0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
# Movement keys with playeborders
keys = pygame.key.get_pressed()
if keys[pygame.K_s] and player.y < 480 - player.height - player.player_vel:
player.y += player.player_vel
if keys[pygame.K_w] and player.y > 280:
player.y -= player.player_vel
if keys[pygame.K_d] and player.x < 640 - player.width - player.player_vel:
player.x += player.player_vel
if keys[pygame.K_a] and player.x > player.player_vel:
player.x -= player.player_vel

for projectile in projectiles:
if projectile.y - projectile.radius < enemy.hitbox[1] + enemy.hitbox[3] and projectile.y + projectile.radius > enemy.hitbox[1]:
if enemy.visible == True:
if projectile.x + projectile.radius > enemy.hitbox[0] and projectile.x - projectile.radius < enemy.hitbox[0] + enemy.hitbox[2]:
enemy.hit()
explosion2.play()
projectiles.pop(projectiles.index(projectile))

if projectile.y < 640 and projectile.y > 0:
projectile.y -= projectile.vel

else:
projectiles.pop(projectiles.index(projectile))

# Player shooting
if keys[pygame.K_SPACE] and shootloop == 0:
if len(projectiles) < 1:
projectiles.append(Projectile(round(player.x + player.width //2), 
round(player.y + player.height //2), [255, 150, 0], 7))

blit()
pygame.display.update()

我试图从我的上一个游戏项目中回收代码，但它不起作用，因为代码结构彼此太不同了。这个项目是面向对象的，而最后一个项目是分散变量的。

Answer 1

与projectiles类似，制作Enemy对象列表:

enemies = []
enemy_count = random.randint(3, 10)
for i in range( enemy_count ):
new_enemy = Enemy(random.randint(10, 100), random.randint(20, 100), 64, 64, 480)
enemies.append( new_enemy )
projectiles = []

更新你的blit()来绘制敌人列表:

def blit(): # This draws the sprites
player.draw(screen)
for enemy in enemies:
enemy.draw(screen)
for projectile in projectiles:
projectile.draw(screen)
score_text = font.render("Score: " + str(score), 1, (0, 109, 255))
version = font.render("Version 01 ", 1, (51, 153, 255))
screen.blit(score_text, (0, 0))
screen.blit(version, (520, 0))

检查它们是否有碰撞:

for enemy in enemies:
for projectile in projectiles:
if projectile.y - projectile.radius < enemy.hitbox[1] + enemy.hitbox[3] and projectile.y + projectile.radius > enemy.hitbox[1]:
if enemy.visible == True:
if projectile.x + projectile.radius > enemy.hitbox[0] and projectile.x - projectile.radius < enemy.hitbox[0] + enemy.hitbox[2]:
enemy.hit()
explosion2.play()
projectiles.pop(projectiles.index(projectile))

你应该可以开始了。

更改相对简单，因为您已经在对象中划分了数据。好工作。

编辑:重新生成一个敌人是一个简单的问题，添加另一个Enemy对象到enemies列表:

new_enemy = Enemy(random.randint(10, 100), random.randint(20, 100), 64, 64, 480)
enemies.append( new_enemy )