设置按钮动画

Question

我一直试图让这段python代码正常工作，但是没有成功。所以我要做的是让我的按钮有3种状态：空闲、悬停和点击。在

然而，由于某些原因，图像并没有改变。有人能告诉我我做错了什么吗？在

import pygame,sys,os
from pygame.locals import *

BG = "bg.jpg"
BUTTON1 = "buttonidle.png"
BUTTON2 = "buttonhov.png"
BUTTON3 = "buttonclick.png"

def load_image(name, colorkey=None):
    fullname = os.path.join(name)
    try:
        image = pygame.image.load(fullname)
    except pygame.error, message:
        print "Can't load image:", name
        raise SystemExit, message
    image = image.convert()
    if colorkey is not None:
        if colorkey is -1:
            colorkey = image.get_at((0,0))
        image.set_colorkey(colorkey, RLEACCEL)
    return image, image.get_rect()


class Button(pygame.sprite.Sprite):

    global buttonsprite

    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        if buttonsprite == 1:
            self.image,self.rect = load_image(BUTTON1, -1)
        screen = pygame.display.get_surface()
        self.area = screen.get_rect()
        self.rect.topleft = 190, 140

        if buttonsprite == 2:
            self.image,self.rect = load_image(BUTTON2, -1)
        if buttonsprite == 3:
            self.image,self.rect = load_image(BUTTON3, -1)







buttonsprite = 1
pygame.init()
screen = pygame.display.set_mode((500,300))
pygame.display.set_caption('Window')

background = pygame.Surface(screen.get_size())
background = background.convert()
background.fill((255,255,255))

screen.blit(background,(0,0))
pygame.display.flip()

button = Button()
allsprites = pygame.sprite.RenderPlain((button))
allsprites.update()
screen.blit(background,(0,0))
allsprites.draw(screen)
pygame.display.flip()

while True:
    x,y = pygame.mouse.get_pos()
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
    if x >= 193 and x <= 315 and y >= 143 and y <= 171:
        buttonsprite = 2
        if event.type == MOUSEBUTTONDOWN:
            buttonsprite = 3
    else:    
        buttonsprite = 1

谢谢你！在

编辑：

好的，我得到了一些帮助，我添加了一个更新函数。但似乎还是不行。在

^{pr2}$

Answer 1

看看这个示例代码。它有一个菜单，按钮有两种状态。正常且悬停。https://gist.github.com/2802185

Answer 2

我认为这是因为你没有调用某种更新函数来主动改变图像。如果你要重新创建按钮后，你可以看到你想要的改变。在

基本上，更改值并不能达到您想要的效果，您需要让按钮知道它有一个新值。在

不良相关示例：

def button():
  global number
  print number

number = 1

button() 
>>> 1           <        ↰
number = 'A STRING NOW'          ↑
#now the printed string doesn't above change, so you'd have to call button again for it to change:
button()
>>> A STRING NOW # <  BAM