if (scale & (scale - 1)) == 0:
时间: 2024-05-24 12:13:08 浏览: 26
This is not a complete question as there is no condition or logic defined after "scale". Please provide more information so that I can assist you better.
相关问题
解释python代码if scale == 0: scale = 1
这行代码是一个简单的条件语句,它的含义是:如果变量 scale 的值为 0,则将它赋值为 1。这行代码中使用了等于运算符(==)来比较变量 scale 的值是否等于 0。如果条件成立,即变量 scale 的值为 0,那么就将它赋值为 1,这个操作使用了赋值运算符(=)。整个语句使用了 if 关键字来表示条件语句的开始。
import pygame pygame.init() SCREEN_WIDTH = 640 SCREEN_HEIGHT = 480 screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT)) pygame.display.set_caption("Resize Image") image = pygame.image.load("miaojv.jpg") image_rect = image.get_rect() scale = 1.0 min_scale = 0.5 max_scale = 2.0 while True: for event in pygame.event.get(): if event.type == pygame.QUIT: pygame.quit() exit() elif event.type == pygame.MOUSEBUTTONDOWN: if event.button == 1: # left click scale += 0.1 if scale < min_scale: scale = min_scale elif event.button == 3: # right click scale -= 0.1 if scale > max_scale: scale = max_scale screen.fill((255, 255, 255)) scaled_image = pygame.transform.scale(image, (int(image_rect.width * scale), int(image_rect.height * scale))) screen.blit(scaled_image, (SCREEN_WIDTH // 2 - scaled_image.get_width() // 2, SCREEN_HEIGHT // 2 - scaled_image.get_height() // 2)) pygame.display.flip() 改为左击放大,双击缩小
你可以将代码中以下部分:
```
if event.button == 1: # left click
scale += 0.1
if scale < min_scale:
scale = min_scale
elif event.button == 3: # right click
scale -= 0.1
if scale > max_scale:
scale = max_scale
```
修改为:
```
if event.button == 1: # left click
if event.type == pygame.MOUSEBUTTONDOWN and event.button == 1: # single click
scale += 0.1
if scale > max_scale:
scale = max_scale
elif event.type == pygame.MOUSEBUTTONDOWN and event.button == 1 and event.pos == last_click_pos: # double click
scale -= 0.1
if scale < min_scale:
scale = min_scale
last_click_pos = event.pos
```
这样就可以实现左击放大,双击缩小的效果了。
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