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层的数值不一样,显示的优先级就不一样,数字越大,越显示上层。
所以,可以把背景层设置成 -1层,很少用的界面,设置成 -2,先隐藏起来。
切换界面时,只要设置层的数值机可以了。 代码如下:
- import pygame
- import pygame
- import os
- import random
- vect = pygame.math.Vector2
-
- #define sprite groups. Do this before creating sprites
- textgroup = pygame.sprite.Group()
- backgroundgroup = pygame.sprite.Group()
- menugroup =pygame.sprite.Group()
- # only the allgroup draws the sprite, so i use LayeredUpdates() instead Group()
- # more sophisticated, can draw sprites in layers
- allgroup = pygame.sprite.LayeredUpdates()
- SCENEWIDTH = 480
- SCENEHEIGHT = 850
-
- class Menu(pygame.sprite.Sprite):
- """ display a menu background"""
-
- def __init__(self):
- self.groups = allgroup, menugroup
- self._layer = -2
- pygame.sprite.Sprite.__init__(self, self.groups)
- self.image = pygame.image.load('images/bg1.png'
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