子弹的起点，包括Pygame中的玩家轮换

Question

我正在制作一个简单的自上而下的射击游戏。问题出在子弹头上。我有一个玩家的图像，步枪的枪管在矩形的顶部和右上角之间。如何使子弹始终从枪管开始而不考虑图像旋转？

# key input
def get_input(self, dt):
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
self.direction.rotate_ip(dt * -360)
if keys[pygame.K_RIGHT]:
self.direction.rotate_ip(dt * 360)
self.angle = self.direction.angle_to((0, -1))
self.image = pygame.transform.rotate(self.image, self.angle)
self.rect = self.image.get_rect(center=self.rect.center)
if keys[pygame.K_UP]:
self.movement = 1
self.status = 'move'
else:
self.movement = 0
self.status = 'idle'
if keys[pygame.K_DOWN]:
self.movement = -1
self.status = 'move'
if keys[pygame.K_SPACE] and not self.bullet.sprites():
self.create_bullet(dt)
shoot = pygame.mixer.Sound('audio/rumble.flac')
shoot.play()
# movement
def move(self, speed, dt):
movement_v = self.direction * self.movement
if movement_v.length() > 0:
movement_v.normalize_ip()
self.pos += movement_v * dt * speed
self.rect = self.image.get_rect(center=self.pos)
#   boundary
if self.rect.x <= 0:
self.rect.x = 0
if self.rect.x >= 1216:
self.rect.x = 1216
if self.rect.y <= 0:
self.rect.y = 0
if self.rect.y >= 704:
self.rect.y = 704

# create bullet instance
def create_bullet(self, dt):
self.bullet.add(Bullet(self.rect.center, self.direction.normalize(), self.bullet_speed, self.angle))

Answer 1

您已经使用pygame.math.Vector2.rotate旋转项目符号起点的偏移。例如：

offset = pygame.math.Vecotr2(15, 10) # (15, 10) is just an example
rotated_offset = offset.rotate(-self.angle) 
pos = pygame.math.Vector2(self.rect.center) + rotated_offset 
bullet = Bullet((pos.x, pos.y), ...)