Python Pygame,如何在屏幕上绘制形状并删除之前的曲面?
所以我有这个代码,它做了应该做的事情。我想让它做的是随机缩放不同数量的正方形,它会这样做。我的问题在于blit函数,我的正方形似乎只是放大了,因为blit没有删除旧的形状,它只是将新的形状复制到曲面上 如何使形状膨胀和收缩,而不仅仅是膨胀 我的代码:Python Pygame,如何在屏幕上绘制形状并删除之前的曲面?,python,python-3.x,pygame,Python,Python 3.x,Pygame,所以我有这个代码,它做了应该做的事情。我想让它做的是随机缩放不同数量的正方形,它会这样做。我的问题在于blit函数,我的正方形似乎只是放大了,因为blit没有删除旧的形状,它只是将新的形状复制到曲面上 如何使形状膨胀和收缩,而不仅仅是膨胀 我的代码: import sys, random, pygame from pygame.locals import * pygame.init() w = 640 h = 480 screen = pygame.display.set_mode((w,
import sys, random, pygame
from pygame.locals import *
pygame.init()
w = 640
h = 480
screen = pygame.display.set_mode((w,h))
morphingShape = pygame.Surface((20,20))
morphingShape.fill((255, 137, 0)) #random colour for testing
morphingRect = morphingShape.get_rect()
def ShapeSizeChange(shape, screen):
x = random.randint(-21, 20)
w = shape.get_width()
h = shape.get_height()
if w + x > 0 and h + x > 0:
shape = pygame.transform.smoothscale(shape, (w + x, h + x))
else:
shape = pygame.transform.smoothscale(shape, (w - x, h - x))
shape.fill((255, 137, 0))
rect = shape.get_rect()
screen.blit(shape, rect)
return shape
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
morphingShape = ShapeSizeChange(morphingShape, screen)
pygame.display.update()
在每一帧(While循环的每次迭代)上,您都应该擦除屏幕。默认情况下,屏幕(窗口)颜色为黑色,因此应通过调用screen.fill((0,0,0))
清除屏幕。下面是完整的代码,现在正按照您的预期工作:
import sys, random, pygame
from pygame.locals import *
pygame.init()
w = 640
h = 480
screen = pygame.display.set_mode((w,h))
morphingShape = pygame.Surface((20,20))
morphingShape.fill((255, 137, 0)) #random colour for testing
morphingRect = morphingShape.get_rect()
# clock object that will be used to make the animation
# have the same speed on all machines regardless
# of the actual machine speed.
clock = pygame.time.Clock()
def ShapeSizeChange(shape, screen):
x = random.randint(-21, 20)
w = shape.get_width()
h = shape.get_height()
if w + x > 0 and h + x > 0:
shape = pygame.transform.smoothscale(shape, (w + x, h + x))
else:
shape = pygame.transform.smoothscale(shape, (w - x, h - x))
shape.fill((255, 137, 0))
rect = shape.get_rect()
screen.blit(shape, rect)
return shape
while True:
# limit the demo to 50 frames per second
clock.tick( 50 );
# clear screen with black color
# THIS IS WHAT WAS REALLY MISSING...
screen.fill( (0,0,0) )
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
morphingShape = ShapeSizeChange(morphingShape, screen)
pygame.display.update()
请注意,只需添加screen.fill((0,0,0))
即可解决您的问题