Pygame球弹跳仿真中的变量赋值

Question

我正在尝试使用python3.7.3中的Pygame模块进行球反弹模拟。我所在的班级展示球，但不配合运动。错误是“分配前引用的局部变量x”。我认为这意味着它是局部的，但需要是全局的，但是要将球的数量作为一个变量（所以我可以说要生成多少个球），我不知道如何解决这个问题。你知道吗

我试过阅读其他问题，但没有一个能解决我的问题。我可以让一个球在屏幕上弹跳，边界碰撞工作，但不是当我使它面向对象。我也用自变量来表示每一个球，但那不起作用。你知道吗

class BallEntity():
    def __init__(self, radius):
        x = random.randint(radius, win_width - radius)
        y = random.randint(radius, win_height - radius)
        pos = x, y
        pygame.draw.circle(win, (248, 24, 148), pos, radius)
        dx = random.randint(-5, 5)
        dy = random.randint(-5, 5)
        BallEntity.movement(self)

    def movement(self):
        if x <= r1 or x >= win_width - r1:
            dx = -dx
        elif x > r1 and x < win_width -r1:
            x += dx

        if y <= r1 or y >= win_height - r1:
            dy = -dy
        elif self.y > r1 and self.y < win_height -r1:
            y += dy


numbBalls = 8
r1 = 8
for i in range(numbBalls):
    BallEntity.__init__(i, r1)

我希望球在碰撞工作时打印和移动，但是我得到了错误“赋值前引用的局部变量x”

Answer 1

• global win,x,y让我们删除未定义的x`
• 此外，x，y用于内部class而不是global variable到各个圆点。你知道吗

---

import random

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

pygame.init()

win_width = 500
win_height = 400
radius = 90

win = pygame.display.set_mode((win_width, win_height), 0, 32)

class BallEntity():
    win = None

    x = 0
    y = 0

    dx = 1
    dy = 1

    radius = 0
    # preious position(used for delete previous circle after movement)
    prePos = 0, 0
    pos = 0, 0
    def __init__(self, i, radius):
        self.radius = radius

        # random position (x, y)
        self.x = random.randint(radius, win_width - radius)
        self.y = random.randint(radius, win_height - radius)

        self.dx = random.randint(-5, 5)
        self.dy = random.randint(-5, 5)

    def movement(self):
        global win

        if self.x <= r1 or self.x >= win_width - r1:
            self.dx = -self.dx
        elif self.x > r1 and self.x < win_width -r1:
            self.x += self.dx

        if self.y <= r1 or self.y >= win_height - r1:
            self.dy = -self.dy
        elif self.y > r1 and self.y < win_height -r1:
            self.y += self.dy

        self.pos = self.x, self.y
        # draw background color to delete previous position
        pygame.draw.circle(win, (0, 0, 0), self.prePos, self.radius)
        # draw circle
        pygame.draw.circle(win, (248, 24, 148), self.pos, self.radius)

        self.prePos = self.pos

numbBalls = 5
r1 = 8


balls = []



# Create balls and store list
for i in range(numbBalls):
    e = BallEntity(i, r1)
    balls.append(e)

while True:
    # update circle position via movement()
    for i in range(numbBalls):
        balls[i].movement()

    pygame.display.update()
    # delay for animation
    time.sleep(0.1)
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()