我需要访问类中的全局对象来更改它的图像。这是代码:
import pygame
from livewires import games
from livewires import color
import time
import random
games.init(screen_width = 640, screen_height = 480, fps = 50)
class Cursor(games.Sprite):
"""The pokemon based cursor!"""
def __init__(self, image, x ,y):
super().__init__(image=image, x=x, y=y)
def update(self):
self.x = games.mouse.x
self.y = games.mouse.y
self.check_collide()
def check_collide(self):
for sprite in self.overlapping_sprites:
sprite.handle_collide()
class Play_Button(games.Sprite):
"""The 'Play' button on the menu."""
def __init__(self , image, x ,y):
super().__init__(image=image, x=x, y=y)
def handle_collide(self):
global play_obj
play_image2 = games.load_image("playbtn2.png", transparent = True)
play_obj.value = play_image2
print("COME ON!")
class P1C_Button(games.Sprite):
def __init__(self, image, x, y):
super().__init__(image=image, x=x, y=y)
class Logo(games.Sprite):
def handle_collide(self):
print("Collision ignored.")
play_image = games.load_image("playbtn.png", transparent = True)
play_obj = Play_Button(image = play_image,
x = games.screen.width/2,
y = games.screen.height/2)
games.screen.add(play_obj)
logo_image = games.load_image("FamilyMon.png", transparent = True)
logo_obj = Logo(image = logo_image,
x = games.screen.width/2,
y = 75)
games.screen.add(logo_obj)
white_image = games.load_image("white.png", transparent = False)
games.screen.background = white_image
cursor_image = games.load_image("cursor.png", transparent = True)
cursor_obj = Cursor(image = cursor_image,
x = games.mouse.x,
y = games.mouse.y)
games.screen.add(cursor_obj)
games.mouse.is_visible = False
games.screen.event_grab = True
games.screen.mainloop()
其中重要的部分是'Play_Button'的handle_collide方法。它试图访问创建的对象'play_obj',但代码似乎什么都不做。当鼠标设置的Play_Button的handle_collide什么都没有。我已经尽力了,所以如果这看起来像是一个愚蠢的问题而不是抱歉,因为我是新人。
答案 0 :(得分:2)
我试图理解为什么以下列方式做这件事并不能让你满意
def handle_collide(self):
play_image2 = games.load_image("playbtn2.png", transparent = True)
self.value = play_image2
print("COME ON!")
...
从我看到的情况来看,只有一个Play_Button
实例,您希望在collide
发生时更改其图像。
那么,为什么不使用self.value
?
答案 1 :(得分:2)
你不应该首先使用全局变量。
您只创建一个Play_Button
对象,因此全局play_obj
始终 is self
。您可以让该对象设置自己的字段:
self.value = play_image2