<p>所以游戏中的每颗小行星都由一个<code>Rect</code>表示,存储在<code>badguys</code>中。在</p>
<p>使用<code>Rect</code>,您可以存储一个位置和一个大小(因为<code>Rect</code>具有<code>x</code>、<code>y</code>、<code>width</code>和<code>height</code>)的属性。在</p>
<p>现在,您需要为每颗小行星存储额外的信息/状态,因此仅使用<code>Rect</code>是不够的。您需要一个包含更多字段的不同数据结构。在</p>
<p>由于使用python,fitting数据结构是一个能够保存随机向量的类。在</p>
<p>但让我们再考虑一下。由于您使用了pygame,pygame已经提供了一个用于表示游戏对象的类,该类称为<a href="https://www.pygame.org/docs/ref/sprite.html#pygame.sprite.Sprite" rel="nofollow noreferrer">^{<cd10>}</a>。在</p>
<p>所以我们开始(注意代码中的注释):</p>
<pre><code>import pygame
import random
screen = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()
class Asteroid(pygame.sprite.Sprite):
def __init__(self, x, y):
super().__init__()
# let's create an image of an asteroid by drawing some lines
self.image = pygame.Surface((50, 50))
self.image.set_colorkey((11, 12, 13))
self.image.fill((11, 12, 13))
pygame.draw.polygon(self.image, pygame.Color('grey'), [(0, 11), (20, 0), (50, 10), (15, 22), (27, 36), (10, 50), (0, 11)], 1)
# Let's store a copy of that image to we can easily rotate the image
self.org_image = self.image.copy()
# The rect is used to store the position of the Sprite
# this is required by pygame
self.rect = self.image.get_rect(topleft=(x, y))
# Let's create a random vector for the asteroid
self.direction = pygame.Vector2(0, 0)
while self.direction.length() == 0:
self.direction = pygame.Vector2(random.uniform(-1, 2), random.uniform(-1, 2))
# Also we want a constant, random speed
self.direction.normalize_ip()
self.speed = random.uniform(0.1, 0.3)
# we additionaly store the position in a vector, so the math is easy
self.pos = pygame.Vector2(self.rect.center)
# Aaaaaaaaaand a random rotation, because why not
self.rotation = random.uniform(-0.3, 0.3)
self.angle = 0
def update(self, dt):
# movement is easy, just add the position and direction vector
self.pos += self.direction * self.speed * dt
self.angle += self.rotation * dt
self.image = pygame.transform.rotate(self.org_image, self.angle)
# update the rect, because that's how pygame knows where to draw the sprite
self.rect = self.image.get_rect(center=self.pos)
SPAWNENEMY = pygame.USEREVENT + 1
pygame.time.set_timer(SPAWNENEMY, 800)
asteroids = pygame.sprite.Group()
dt = 0
while True:
for e in pygame.event.get():
if e.type == pygame.QUIT:
quit()
if e.type == SPAWNENEMY:
asteroids.add(Asteroid(random.randint(50, 200), random.randint(50, 200)))
screen.fill(pygame.Color('black'))
asteroids.draw(screen)
asteroids.update(dt)
pygame.display.flip()
dt = clock.tick(60)
</code></pre>