Pygame飞机大战（五）——定义敌机的类，并且创建敌机
同样的，先来分析下敌机都有哪些属性，其实三种机型都是类似的，了解一个之后，其他的其实都没有问题的：
- 主体的图片和坠毁的图片
- 坠毁的音效（大型敌机还有一个出场的音效）
- 敌机的状态，被消灭了就需要复活
- 敌机移动和边界的判断
- 发射子弹（这里篇幅可能会太长，所以讲敌机子弹的部分也省略了，添加的方法其实都是类似的）
下面我们就以大型敌机为例，因为大型敌机还有一个出场的音效，其他的是没有的，他是一个自带BGM的飞机：
class BigEnemy(pygame.sprite.Sprite):
def __init__(self,screen_size):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load("images/enemy3_n1.png").convert_alpha() # 加载敌机的图片，是有两张的，可以像己方飞机一样有动画效果，这里先省略，可以自己添加
self.destroy_images = [] # 创建坠毁动画的列表
self.destroy_images.extend([ # 将敌机坠毁图片添加到列表中
pygame.image.load("images/enemy3_down1.png").convert_alpha(),
pygame.image.load("images/enemy3_down2.png").convert_alpha(),
pygame.image.load("images/enemy3_down3.png").convert_alpha(),
pygame.image.load("images/enemy3_down4.png").convert_alpha(),
pygame.image.load("images/enemy3_down5.png").convert_alpha(),
pygame.image.load("images/enemy3_down6.png").convert_alpha()])
self.rect = self.image.get_rect()
self.width, self.height = screen_size[0], screen_size[1]
self.speed = 1
self.active = True # 表示敌机的生存状态
self.energy = 20 # 设置血量
# 敌机的位置是随机出现的
self.rect.left, self.rect.top = randint(0, self.width - self.rect.width),\
randint(-15*self.height, -5*self.height)
self.mask = pygame.mask.from_surface(self.image)
self.fly_sound = pygame.mixer.Sound("sound/enemy3_flying.wav") # 加载出场音效
self.fly_sound.set_volume(0.2) # 设置音效的音量
self.down_sound = pygame.mixer.Sound("sound/enemy3_down.wav") # 加载坠毁的音效
self.down_sound.set_volume(0.6) # 设置坠毁音效的音量
def move(self):
if self.rect.top < self.height - 60:
self.rect.top += self.speed
else:
self.reset()
if self.rect.bottom == -50: # 当飞机里窗体顶端还有50像素的时候播放出场音效
self.fly_sound.play()
def reset(self):
self.active = True # 重置敌机的状态
self.energy = 20
self.rect.left, self.rect.top = randint(0, self.width - self.rect.width),\
randint(-15*self.height, -5*self.height)
def play_sound(self): # 播放音效
self.fly_sound.stop() # 坠毁了，需要先暂停出场音效
self.down_sound.play() # 播放坠毁音效我们看下怎么实现效果：
import pygame
import sys
from pygame.locals import *
import myclass
pygame.init()
screen_size = width, height = 480, 700
screen = pygame.display.set_mode(screen_size)
pygame.display.set_caption('飞机大战')
bg = pygame.image.load('./images/background.png').convert()
pygame.mixer.music.load('./sound/game_music.ogg')
pygame.mixer.music.set_volume(0.2)
pygame.mixer.music.play(-1)
# 生成大型敌机的方法
def add_big_enemies(group1, group2, num):
for big_enemy_num in range(num): # 这里的num是指飞机的数量
each_big_enemy = myclass.BigEnemy(screen_size) # 创建大型敌机
group1.add(each_big_enemy) # 将敌机添加到组中
group2.add(each_big_enemy)
def main():
clock = pygame.time.Clock()
heroPlane = myclass.myPlane(screen, screen_size)
enemies = pygame.sprite.Group() # 创建全部敌机的组
big_enemies = pygame.sprite.Group() # 创建大型敌机的组
add_big_enemies(big_enemies, enemies, 2) # 生成敌机
bullet1 = []
bullet1_index = 0
BULLET1_NUM = 5
for i in range(BULLET1_NUM):
bullet1.append(myclass.Bullet(heroPlane.rect.midtop,True))
big_destroy_index = 0 # 用来存储动画播放的下标
while True:
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
key_pressed = pygame.key.get_pressed()
if key_pressed[K_UP]:
heroPlane.moveUp()
if key_pressed[K_DOWN]:
heroPlane.moveDown()
if key_pressed[K_LEFT]:
heroPlane.moveLeft()
if key_pressed[K_RIGHT]:
heroPlane.moveRight()
screen.blit(bg,(0,0))
heroPlane.animation()
if not (heroPlane.delay % 10):
bullet1[bullet1_index].reset(heroPlane.rect.midtop)
bullet1_index = (bullet1_index + 1) % BULLET1_NUM
for each in bullet1:
each.move()
screen.blit(each.image, each.rect)
# 绘制大型飞机
for each in big_enemies:
if each.active == True: # 如果飞机是活着的
each.move() # 改变飞机的位置
screen.blit(each.image, each.rect) # 在窗体上绘制飞机
else: # 飞机被击毁了
if not (heroPlane.delay % 3): # 切换图片稍微延时一会儿
screen.blit(each.destroy_images[big_destroy_index], each.rect) # 绘制坠毁图片
big_destroy_index = (big_destroy_index + 1) % 6 # 这里是因为坠毁图片一共有六张
if big_destroy_index == 0: # 如果是最后一张
each.play_sound() # 播放音效
each.reset() # 重生飞机
pygame.display.flip()
clock.tick(60)
if __name__ == '__main__':
main()我们再来整理一下，创建敌机的步骤：
- 先创建一个大的敌方飞机组，所有的敌方飞机最终都要添加到这个组里面
- 然后每种敌机都有一个小的组，然后根据我们定义的数量，生成敌机，并添加到两个组里面
- 绘制飞机，首先判断飞机的状态，如果是正常飞行的状态，直接绘制就好了，如果被击毁了，每隔三个指令周期切换一张图片，形成坠毁的动画效果
- 最后播放坠毁音效，然后重生
我们最后来看一下全部的敌方飞机类和整体实现代码：
类和实现代码是分开的：
- 实现代码：main.py
- 定义的类：myclass.py
import pygame
from random import *
# 小型敌机
class SmallEnemy(pygame.sprite.Sprite):
def __init__(self, screen_size):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load("images/enemy1.png").convert_alpha()
self.destroy_images = []
self.destroy_images.extend([
pygame.image.load("./images/enemy1_down1.png").convert_alpha(),
pygame.image.load("./images/enemy1_down2.png").convert_alpha(),
pygame.image.load("./images/enemy1_down3.png").convert_alpha(),
pygame.image.load("./images/enemy1_down4.png").convert_alpha()])
self.rect = self.image.get_rect()
self.width, self.height = screen_size[0], screen_size[1]
self.speed = 2
self.active = True
self.rect.left, self.rect.top = randint(0, self.width - self.rect.width),\
randint(-5*self.height,0)
self.mask = pygame.mask.from_surface(self.image)
self.down_sound = pygame.mixer.Sound("sound/enemy1_down.wav")
self.down_sound.set_volume(0.3)
def move(self):
if self.rect.top < self.height - 60:
self.rect.top += self.speed
else:
self.reset()
def reset(self):
self.active = True
self.rect.left, self.rect.top = randint(0, self.width - self.rect.width),\
randint(-5*self.height,0)
def play_sound(self):
self.down_sound.play()
# 中型敌机
class MidEnemy(pygame.sprite.Sprite):
ENERGY = 10
def __init__(self,screen_size):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load("images/enemy2.png").convert_alpha()
self.destroy_images = []
self.destroy_images.extend([
pygame.image.load("./images/enemy2_down1.png").convert_alpha(),
pygame.image.load("./images/enemy2_down2.png").convert_alpha(),
pygame.image.load("./images/enemy2_down3.png").convert_alpha(),
pygame.image.load("./images/enemy2_down4.png").convert_alpha()])
self.rect = self.image.get_rect()
self.width, self.height = screen_size[0], screen_size[1]
self.speed = 1
self.active = True
self.energy = MidEnemy.ENERGY
self.rect.left, self.rect.top = randint(0, self.width - self.rect.width),\
randint(-10*self.height, -self.height)
self.mask = pygame.mask.from_surface(self.image)
self.down_sound = pygame.mixer.Sound("sound/enemy2_down.wav")
self.down_sound.set_volume(0.3)
def move(self):
if self.rect.top < self.height - 60:
self.rect.top += self.speed
else:
self.reset()
def reset(self):
self.active = True
self.energy = MidEnemy.ENERGY
self.rect.left, self.rect.top = randint(0, self.width - self.rect.width),\
randint(-10*self.height,0)
def play_sound(self):
self.down_sound.play()
# 大型敌机
class BigEnemy(pygame.sprite.Sprite):
ENERGY = 20
def __init__(self,screen_size):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load("images/enemy3_n1.png").convert_alpha()
self.destroy_images = []
self.destroy_images.extend([
pygame.image.load("./images/enemy3_down1.png").convert_alpha(),
pygame.image.load("./images/enemy3_down2.png").convert_alpha(),
pygame.image.load("./images/enemy3_down3.png").convert_alpha(),
pygame.image.load("./images/enemy3_down4.png").convert_alpha(),
pygame.image.load("./images/enemy3_down5.png").convert_alpha(),
pygame.image.load("./images/enemy3_down6.png").convert_alpha()])
self.rect = self.image.get_rect()
self.width, self.height = screen_size[0], screen_size[1]
self.speed = 1
self.active = True
self.energy = BigEnemy.ENERGY
self.rect.left, self.rect.top = randint(0, self.width - self.rect.width),\
randint(-15*self.height, -5*self.height)
self.mask = pygame.mask.from_surface(self.image)
self.fly_sound = pygame.mixer.Sound("sound/enemy3_flying.wav")
self.fly_sound.set_volume(0.2)
self.down_sound = pygame.mixer.Sound("sound/enemy3_down.wav")
self.down_sound.set_volume(0.6)
def move(self):
if self.rect.top < self.height - 60:
self.rect.top += self.speed
else:
self.reset()
if self.rect.bottom == -50:
self.fly_sound.play()
def reset(self):
self.active = True
self.energy = BigEnemy.ENERGY
self.rect.left, self.rect.top = randint(0, self.width - self.rect.width),\
randint(-15*self.height, -5*self.height)
def play_sound(self):
self.fly_sound.stop()
self.down_sound.play()import pygame
import sys
from pygame.locals import *
import myclass
pygame.init()
screen_size = width, height = 480, 700
screen = pygame.display.set_mode(screen_size)
pygame.display.set_caption('飞机大战')
bg = pygame.image.load('./images/background.png').convert()
pygame.mixer.music.load('./sound/game_music.ogg')
pygame.mixer.music.set_volume(0.2)
pygame.mixer.music.play(-1)
# 生成大型敌机的方法
def add_big_enemies(group1, group2, num):
for big_enemy_num in range(num): # 这里的num是指飞机的数量
each_big_enemy = myclass.BigEnemy(screen_size) # 创建大型敌机
group1.add(each_big_enemy) # 将敌机添加到组中
group2.add(each_big_enemy)
# 生成中型飞机
def add_mid_enemies(group1, group2, num):
for mid_enemy_num in range(num):
each_mid_enemy = myclass.MidEnemy(screen_size)
group1.add(each_mid_enemy)
group2.add(each_mid_enemy)
# 生成大型飞机
def add_small_enemies(group1, group2, num):
for small_enemy_num in range(num):
each_small_enemy = myclass.SmallEnemy(screen_size)
group1.add(each_small_enemy)
group2.add(each_small_enemy)
def main():
clock = pygame.time.Clock()
heroPlane = myclass.myPlane(screen, screen_size)
enemies = pygame.sprite.Group() # 创建全部敌机的组
big_enemies = pygame.sprite.Group() # 创建大型敌机的组
add_big_enemies(big_enemies, enemies, 2) # 生成敌机
mid_enemies = pygame.sprite.Group()
add_mid_enemies(mid_enemies, enemies, 4)
small_enemies = pygame.sprite.Group()
add_small_enemies(small_enemies, enemies, 15)
bullet1 = []
bullet1_index = 0
BULLET1_NUM = 5
for i in range(BULLET1_NUM):
bullet1.append(myclass.Bullet(heroPlane.rect.midtop,True))
small_destroy_index = 0
mid_destroy_index = 0
big_destroy_index = 0
while True:
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
key_pressed = pygame.key.get_pressed()
if key_pressed[K_UP]:
heroPlane.moveUp()
if key_pressed[K_DOWN]:
heroPlane.moveDown()
if key_pressed[K_LEFT]:
heroPlane.moveLeft()
if key_pressed[K_RIGHT]:
heroPlane.moveRight()
screen.blit(bg,(0,0))
heroPlane.animation()
if not (heroPlane.delay % 10):
bullet1[bullet1_index].reset(heroPlane.rect.midtop)
bullet1_index = (bullet1_index + 1) % BULLET1_NUM
for each in bullet1:
each.move()
screen.blit(each.image, each.rect)
# 绘制大型飞机
for each in big_enemies:
if each.active == True: # 如果飞机是活着的
each.move() # 改变飞机的位置
screen.blit(each.image, each.rect) # 在窗体上绘制飞机
else: # 飞机被击毁了
if not (heroPlane.delay % 3): # 切换图片稍微延时一会儿
screen.blit(each.destroy_images[big_destroy_index], each.rect) # 绘制坠毁图片
big_destroy_index = (big_destroy_index + 1) % 6 # 这里是因为坠毁图片一共有六张
if big_destroy_index == 0: # 如果是最后一张
each.play_sound() # 播放音效
each.reset() # 重生飞机
for each in mid_enemies:
if each.active == True:
each.move()
screen.blit(each.image, each.rect)
else:
if not (heroPlane.delay % 3):
screen.blit(each.destroy_images[mid_destroy_index], each.rect)
mid_destroy_index = (mid_destroy_index + 1) % 4
if mid_destroy_index == 0:
each.play_sound()
each.reset()
for each in small_enemies:
if each.active == True:
each.move()
screen.blit(each.image, each.rect)
else:
if not (heroPlane.delay % 3):
screen.blit(each.destroy_images[small_destroy_index], each.rect)
small_destroy_index = (small_destroy_index + 1) % 4
if small_destroy_index == 0:
each.play_sound()
each.reset()
pygame.display.flip()
clock.tick(60)
if __name__ == '__main__':
main()