视频
添加盾牌
伤害玩家
盾牌标尺
视频本课程的视频
添加盾牌现在，我们的玩家被一颗流星击中就摧毁。这不是很有趣，所以我们要向Player类添加一个shield属性，它是0 - 100 的数字。
class Player(pygame.sprite.Sprite):
def __init__(self):
self.speedx = 0
self.shield = 100
现在，每当玩家被流星击中时，我们可以从盾牌中减去一点。当护盾达到0时，玩家被摧毁。为了让事情变得更有趣，我们可以通过使用流星的radius属性使大型流星比微小流星造成更大的伤害。
在下一个视频中，我们将为玩家添加一些盾牌，这样我们就不会那么容易死亡。
伤害玩家目前，我们的敌人与玩家碰撞代码非常简单：
# check to see if a mob hit the player
hits = pygame.sprite.spritecollide(player, mobs, False, pygame.sprite.collide_circle)
if hits:
running = False
我们需要做一些改变：
# check to see if a mob hit the player
hits = pygame.sprite.spritecollide(player, mobs, True, pygame.sprite.collide_circle)
for hit in hits:
player.shield -= hit.radius * 2
if player.shield <= 0:
running = False
我们将 spritecollide函数的参数False更改为True，因为我们希望流星在射中时将其删除。如果我们不这样做，那么流星将继续存在，当它移动时，下一帧就会有另一次碰撞，依此类推。此外，我们有可能同时击中多颗流星，hits其中可以有多个项目。我们通过循环hits，并根据它的半径为每次命中扣除一些盾牌。最后，如果玩家的盾牌达到0，游戏将结束。
您可能已经注意到的一件事是，由于我们正在删除任何击中玩家的敌人，因此，我们正在减少游戏中的敌人总数。我们希望它保持不变，所以每当我们移除一个敌人时，我们都需要生成一个新的敌人。我们是这样生成原始的敌人，如下所示：
for i in range(8):
m = Mob()
all_sprites.add(m)
mobs.add(m)
但，我们需要生成一个新的敌人，这是重复代码，这是一件坏事。相反，我们将 mob 创建代码移动到一个函数中，我们可以在需要时使用它：
def newmob():
m = Mob()
all_sprites.add(m)
mobs.add(m)
现在，我们可以在游戏开始时，当我们射中敌人时，以及当我们需要替换击中玩家的敌人时，都可以使用该函数：
for i in range(8):
newmob()
# check to see if a bullet hit a mob
hits = pygame.sprite.groupcollide(mobs, bullets, True, True)
for hit in hits:
score += 50 - hit.radius
random.choice(expl_sounds).play()
newmob()
# check to see if a mob hit the player
hits = pygame.sprite.spritecollide(player, mobs, True, pygame.sprite.collide_circle)
for hit in hits:
player.shield -= hit.radius * 2
newmob()
if player.shield <= 0:
running = False
盾牌标尺
我们有一个盾牌的值，我们需要显示它，但不仅仅是显示数字，我们将制作一个条形图，显示盾牌的满/空：
def draw_shield_bar(surf, x, y, pct):
if pct < 0:
pct = 0
BAR_LENGTH = 100
BAR_HEIGHT = 10
fill = (pct / 100) * BAR_LENGTH
outline_rect = pygame.Rect(x, y, BAR_LENGTH, BAR_HEIGHT)
fill_rect = pygame.Rect(x, y, fill, BAR_HEIGHT)
pygame.draw.rect(surf, GREEN, fill_rect)
pygame.draw.rect(surf, WHITE, outline_rect, 2)
此函数的工作方式与我们之前定义的draw_text函数类似。它将绘制一个长为BAR_LENGTH、高为BAR_HEIGHT 的条形，位于(x, y) 该柱并按pct值填充。我们将绘制两个矩形：第一个矩形将是白色轮廓，第二个矩形是绿色填充部分。我们在游戏循环的绘制部分添加对此函数的调用：
draw_text(screen, str(score), 18, WIDTH / 2, 10)
draw_shield_bar(screen, 5, 5, player.shield)
现在我们可以看到当它下降时我们剩下多少盾牌：
此部分的完整代码
# KidsCanCode - Game Development with Pygame video series
# Shmup game - part 9
# Video link: https://www.youtube.com/watch?v=vvgWfNLgK9c
# Player shield
# Frozen Jam by tgfcoder <https://twitter.com/tgfcoder> licensed under CC-BY-3
# Art from Kenney.nl
import pygame
import random
from os import path
img_dir = path.join(path.dirname(__file__), 'img')
snd_dir = path.join(path.dirname(__file__), 'snd')
WIDTH = 480
HEIGHT = 600
FPS = 60
# define colors
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)
YELLOW = (255, 255, 0)
# initialize pygame and create window
pygame.init()
pygame.mixer.init()
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Shmup!")
clock = pygame.time.Clock()
font_name = pygame.font.match_font('arial')
def draw_text(surf, text, size, x, y):
font = pygame.font.Font(font_name, size)
text_surface = font.render(text, True, WHITE)
text_rect = text_surface.get_rect()
text_rect.midtop = (x, y)
surf.blit(text_surface, text_rect)
def newmob():
m = Mob()
all_sprites.add(m)
mobs.add(m)
def draw_shield_bar(surf, x, y, pct):
if pct < 0:
pct = 0
BAR_LENGTH = 100
BAR_HEIGHT = 10
fill = (pct / 100) * BAR_LENGTH
outline_rect = pygame.Rect(x, y, BAR_LENGTH, BAR_HEIGHT)
fill_rect = pygame.Rect(x, y, fill, BAR_HEIGHT)
pygame.draw.rect(surf, GREEN, fill_rect)
pygame.draw.rect(surf, WHITE, outline_rect, 2)
class Player(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.transform.scale(player_img, (50, 38))
self.image.set_colorkey(BLACK)
self.rect = self.image.get_rect()
self.radius = 20
# pygame.draw.circle(self.image, RED, self.rect.center, self.radius)
self.rect.centerx = WIDTH / 2
self.rect.bottom = HEIGHT - 10
self.speedx = 0
self.shield = 100
def update(self):
self.speedx = 0
keystate = pygame.key.get_pressed()
if keystate[pygame.K_LEFT]:
self.speedx = -8
if keystate[pygame.K_RIGHT]:
self.speedx = 8
self.rect.x += self.speedx
if self.rect.right > WIDTH:
self.rect.right = WIDTH
if self.rect.left < 0:
self.rect.left = 0
def shoot(self):
bullet = Bullet(self.rect.centerx, self.rect.top)
all_sprites.add(bullet)
bullets.add(bullet)
shoot_sound.play()
class Mob(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image_orig = random.choice(meteor_images)
self.image_orig.set_colorkey(BLACK)
self.image = self.image_orig.copy()
self.rect = self.image.get_rect()
self.radius = int(self.rect.width * .85 / 2)
# pygame.draw.circle(self.image, RED, self.rect.center, self.radius)
self.rect.x = random.randrange(WIDTH - self.rect.width)
self.rect.bottom = random.randrange(-80, -20)
self.speedy = random.randrange(1, 8)
self.speedx = random.randrange(-3, 3)
self.rot = 0
self.rot_speed = random.randrange(-8, 8)
self.last_update = pygame.time.get_ticks()
def rotate(self):
now = pygame.time.get_ticks()
if now - self.last_update > 50:
self.last_update = now
self.rot = (self.rot + self.rot_speed) % 360
new_image = pygame.transform.rotate(self.image_orig, self.rot)
old_center = self.rect.center
self.image = new_image
self.rect = self.image.get_rect()
self.rect.center = old_center
def update(self):
self.rotate()
self.rect.x += self.speedx
self.rect.y += self.speedy
if self.rect.top > HEIGHT + 10 or self.rect.left < -100 or self.rect.right > WIDTH + 100:
self.rect.x = random.randrange(WIDTH - self.rect.width)
self.rect.y = random.randrange(-100, -40)
self.speedy = random.randrange(1, 8)
class Bullet(pygame.sprite.Sprite):
def __init__(self, x, y):
pygame.sprite.Sprite.__init__(self)
self.image = bullet_img
self.image.set_colorkey(BLACK)
self.rect = self.image.get_rect()
self.rect.bottom = y
self.rect.centerx = x
self.speedy = -10
def update(self):
self.rect.y += self.speedy
# kill if it moves off the top of the screen
if self.rect.bottom < 0:
self.kill()
# Load all game graphics
background = pygame.image.load(path.join(img_dir, "starfield.webp")).convert()
background_rect = background.get_rect()
player_img = pygame.image.load(path.join(img_dir, "playerShip1_orange.webp")).convert()
bullet_img = pygame.image.load(path.join(img_dir, "laserRed16.webp")).convert()
meteor_images = []
meteor_list = ['meteorBrown_big1.webp', 'meteorBrown_med1.webp', 'meteorBrown_med1.webp',
'meteorBrown_med3.webp', 'meteorBrown_small1.webp', 'meteorBrown_small2.webp',
'meteorBrown_tiny1.webp']
for img in meteor_list:
meteor_images.append(pygame.image.load(path.join(img_dir, img)).convert())
# Load all game sounds
shoot_sound = pygame.mixer.Sound(path.join(snd_dir, 'pew.wav'))
expl_sounds = []
for snd in ['expl3.wav', 'expl6.wav']:
expl_sounds.append(pygame.mixer.Sound(path.join(snd_dir, snd)))
pygame.mixer.music.load(path.join(snd_dir, 'tgfcoder-FrozenJam-SeamlessLoop.ogg'))
pygame.mixer.music.set_volume(0.4)
all_sprites = pygame.sprite.Group()
mobs = pygame.sprite.Group()
bullets = pygame.sprite.Group()
player = Player()
all_sprites.add(player)
for i in range(8):
newmob()
score = 0
pygame.mixer.music.play(loops=-1)
# Game loop
running = True
while running:
# keep loop running at the right speed
clock.tick(FPS)
# Process input (events)
for event in pygame.event.get():
# check for closing window
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_SPACE:
player.shoot()
# Update
all_sprites.update()
# check to see if a bullet hit a mob
hits = pygame.sprite.groupcollide(mobs, bullets, True, True)
for hit in hits:
score += 50 - hit.radius
random.choice(expl_sounds).play()
newmob()
# check to see if a mob hit the player
hits = pygame.sprite.spritecollide(player, mobs, True, pygame.sprite.collide_circle)
for hit in hits:
player.shield -= hit.radius * 2
newmob()
if player.shield <= 0:
running = False
# Draw / render
screen.fill(BLACK)
screen.blit(background, background_rect)
all_sprites.draw(screen)
draw_text(screen, str(score), 18, WIDTH / 2, 10)
draw_shield_bar(screen, 5, 5, player.shield)
# *after* drawing everything, flip the display
pygame.display.flip()
pygame.quit()
第10部分：爆炸
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