我已经在这几天敲打了我的脑袋 . 我正在尝试在其中心轴上旋转一个精灵,并且已经引用了之前关于同一问题的帖子:
How do I rotate an image around its center using Pygame?
我正在使用与前一篇文章中描述的完全相同的代码,并且还使用image_clean属性,以便在连续旋转时不扭曲图像 . 当我尝试旋转我的精灵时,图像的中心在两点之间来回振荡 .
def rotate_center(image, angle):
"""rotate a Surface, maintaining position."""
loc = image.get_rect().center #rot_image is not defined
rot_img = pg.transform.rotate(image, angle)
print('')
print('>>> before: ' + str(rot_img.get_rect().center))
rot_img.get_rect().center = loc
print('>>> after: ' + str(rot_img.get_rect().center))
return rot_img
print语句验证该行:
rot_sprite.get_rect().center = loc
似乎没有将 loc
值分配给图像中心 . 输出总是这样:
>>> before: (32, 32)
>>> after: (32, 32)
>>> before: (37, 37)
>>> after: (37, 37)
>>> before: (41, 41)
>>> after: (41, 41)
>>> before: (43, 43)
>>> after: (43, 43)
>>> before: (45, 45)
>>> after: (45, 45)
>>> before: (45, 45)
>>> after: (45, 45)
>>> before: (43, 43)
>>> after: (43, 43)
>>> before: (41, 41)
>>> after: (41, 41)
>>> before: (37, 37)
>>> after: (37, 37)
我总是希望中心位于(32,32)(我相信) . 任何帮助将不胜感激 .
码:
def main():
pg.init()
# Screen Setup
size = (SCREEN_WIDTH, SCREEN_HEIGHT)
screen = pg.display.set_mode(size)
screen_flags = screen.get_flags()
pg.display.set_caption(GAME_NAME)
done = False
clock = pg.time.Clock()
# SPRITE GROUPS
all_sprites = pg.sprite.Group()
turrets = pg.sprite.Group()
turret = Tower2((SCREEN_WIDTH/2, SCREEN_HEIGHT/2))
turrets.add(turret)
all_sprites.add(turret)
# -------- Main Program Loop -----------
while not done:
# Process Incoming Events
for event in pg.event.get():
if event.type == pg.QUIT:
done = True
if event.type == pg.KEYDOWN:
if event.key == pg.K_q:
done = True
if event.key == pg.K_f:
if screen_flags & pg.FULLSCREEN == False:
screen_flags |= pg.FULLSCREEN
pg.display.set_mode(size, screen_flags)
else:
screen_flags ^= pg.FULLSCREEN
pg.display.set_mode(size, screen_flags)
turret.angle += 10
turret.image = rotate_center(turret.image_clean, turret.angle)
screen.fill(WHITE)
all_sprites.draw(screen)
pg.display.flip()
clock.tick(15)
pg.quit()
class Tower2(pg.sprite.Sprite):
def __init__(self, pos, image, tRange, attackSpeed=1):
super().__init__()
self.image = image
self.image_clean = image
self.rect = self.image.get_rect()
self.rect.center = pos
self.range = tRange
self.attackSpeed = attackSpeed
self.lastAttack = time.time()
self.angle = 0
def __iter__(self):
return self
def canAttack(self):
if time.time() - self.lastAttack > self.attackSpeed:
return True
else:
return False
def rotate(self):
pass
def update(self):
self.angle += 10
self.image = pg.transform.rotate(self.image_clean, self.angle)
self.image.get_rect().center = self.image_clean.get_rect().center
class Turret1(Tower2):
def __init__(self, pos):
TOWER_WIDTH = 64
TOWER_HEIGHT = 64
INIT_RANGE = 200
INIT_RATE = 1
SPEED = 1
tower_img = pg.image.load('imgs/test_rotate.png')
tower_img = pg.transform.scale(tower_img, (TOWER_WIDTH, TOWER_HEIGHT))
super().__init__(pos, tower_img, INIT_RANGE, SPEED)
2 回答
你也必须传递精灵的矩形,因为它保持精灵的实际位置,然后将中心坐标传递给
.get_rect
或将它们分配给新的矩形center
. 如果您只是调用.get_rect()
,则会得到一个带有topleft coords(0,0)的矩形 .您也可以在精灵的
update
方法中执行此操作:不要一直使用
get_rect()
- 它总是创建新的矩形,并且您在这个新矩形中更改位置,而不是原始矩形 . 然后你再次获得新的矩形来显示位置 .除了图像不保持位置,你必须得到矩形一次,并用它来保持位置 .