关于类：了解Python Arcade中的类

Understanding classes in Python Arcade

我对编程很陌生，希望能得到指导/反馈。

以下是完整的工作脚本：

我已经设法让玩家精灵被WASD控制，小行星精灵现在也在屏幕上渲染，用一些物理方法来移动它。它也会从墙壁上反弹，但不会。但出于某种原因，更新功能没有正确调用小行星类，我相信-除非它有其他问题。

非常感谢所有的帮助，所以AR和未来的指导！

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import arcade
import random

""" Universal variables"""

SPRITE_SCALING_PLAYER = 0.5
SPRITE_SCALING_ASTEROID = 0.35

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600

MOVEMENT_SPEED = 5

class Player(arcade.Sprite):
# PLAYER
def update(self):
# COLLISION
self.center_x += self.change_x
self.center_y += self.change_y

if self.left < 0:
self.left = 0
elif self.right > SCREEN_WIDTH - 1:
self.right = SCREEN_WIDTH - 1

if self.bottom < 0:
self.bottom = 0
elif self.top > SCREEN_HEIGHT - 1:
self.top = SCREEN_HEIGHT - 1

class Asteroid(arcade.Sprite):
# ASTEROID
def __init__(self, filename, sprite_scaling):

super().__init__(filename, sprite_scaling)

self.change_x = 0
self.change_y = 0

def update(self):

# Move the asteroid
self.center_x += self.change_x
self.center_y += self.change_y

# rebound
if self.left < 0:
self.change_x *= -1

if self.right > SCREEN_WIDTH:
self.change_x *= -1

if self.bottom < 0:
self.change_y *= -1

if self.top > SCREEN_HEIGHT:
self.change_y *= -1

# MAIN GAME CLASS
class MyGame(arcade.Window):
""" Our custom Window Class"""

def __init__(self):
""" Initializer"""
# Call the parent class initializer
super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT,"Alien")

# Background image will be stored in this variable
self.background = ("space_bg.png")

# Variables that will hold sprite lists
self.all_sprite_list = ["ufo_sprite.png","asteroid.gif"]

# Set up player
self.player_sprite = self.all_sprite_list[0]

# Set up asteroid
self.asteroid_sprite = self.all_sprite_list[1]

# Don't show the mouse cursor
self.set_mouse_visible(False)

# arcade.set_background_color(arcade.color.BLACK)

def setup(self):
""" Set up the game and initialize the variables."""
# background
self.background = arcade.load_texture(self.background)

# Sprite lists
self.all_sprite_list = arcade.SpriteList()

# Set up the player
self.player_sprite = Player("ufo_sprite.png", SPRITE_SCALING_PLAYER)
self.player_sprite.center_x = (SCREEN_WIDTH * 0.50)
self.player_sprite.center_y = (SCREEN_HEIGHT * 0.50)
self.all_sprite_list.append(self.player_sprite)

# Set up asteroid
self.asteroid_sprite = Asteroid("asteroid.gif", SPRITE_SCALING_ASTEROID)
Asteroid.center_x = random.randrange(SCREEN_WIDTH)
Asteroid.center_y = random.randrange(SCREEN_HEIGHT)
Asteroid.change_x = random.randrange(-4, 4)
Asteroid.change_y = random.randrange(-4, 4)
self.all_sprite_list.append(self.asteroid_sprite)

def on_draw(self):
# needed before other drawn elements
arcade.start_render()

# draw background
arcade.draw_texture_rectangle(SCREEN_WIDTH // 2, SCREEN_HEIGHT // 2,
SCREEN_WIDTH, SCREEN_HEIGHT, self.background)
# draw sprites
self.all_sprite_list.draw()

def update(self, delta_time):
""" Movement and game logic"""

self.all_sprite_list.update()

def on_key_press(self, key, modifiers):
"""Called whenever a key is pressed."""

if key == arcade.key.W:
self.player_sprite.change_y = MOVEMENT_SPEED
elif key == arcade.key.S:
self.player_sprite.change_y = -MOVEMENT_SPEED
elif key == arcade.key.A:
self.player_sprite.change_x = -MOVEMENT_SPEED
elif key == arcade.key.D:
self.player_sprite.change_x = MOVEMENT_SPEED
# elif key == arcade.key.SPACE:
# self.player_sprite.change_x = MOVEMENT_SPEED

def on_key_release(self, key, modifiers):
"""Called when the user releases a key."""

if key == arcade.key.W or key == arcade.key.S:
self.player_sprite.change_y = 0
elif key == arcade.key.A or key == arcade.key.D:
self.player_sprite.change_x = 0
# elif key == arcade.key.SPACE:
# self.player_sprite.change_y = (SCREEN_HEIGHT * 0.005)

def main():
""" Main method"""
window = MyGame()
window.setup()
arcade.run()

arcade.schedule(update, 1 / 80)

if __name__ =="__main__":
main()