python笔记（四十）pygame（7） 动画精灵

import pygame
import sys
from random import *


# 动画精灵就是一个带有图像和位置数据的对象
# 我们这里继承他，主要调用一个初始化函数
class Ball(pygame.sprite.Sprite):  # 继承动画精灵基类

    # 调用动画精灵的初始化函数
    def __init__(self,image,position,speed,bg_size):  
        pygame.sprite.Sprite.__init__(self)

        self.image = pygame.image.load(image).convert_alpha()
        self.rect = self.image.get_rect()
        self.rect.left, self.rect.top = position
        self.speed = speed
        self.width, self.height = bg_size[0], bg_size[1]

    def move(self):
        self.rect = self.rect.move(self.speed)

        if self.rect.right < 0:
            self.rect.left = self.width

        elif self.rect.left > self.width:
            self.rect.right = 0

        elif self.rect.bottom < 0:
            self.rect.top = self.height

        elif self.rect.top > self.height:
            self.rect.bottom = 0

def main():
    pygame.init()

    ball_image = "gray_ball.png"
    bg_image = "background.png"

    # 如果点击暂停 可以结束循环
    running = True

    bg_size = width, height = 1024,681
    screen = pygame.display.set_mode(bg_size)
    pygame.display.set_caption("玩个球")

    background = pygame.image.load(bg_image).convert_alpha()

    balls = []

    for i in range(5):
        position = randint(0, width-100), randint(0, height-100)
        speed = [randint(-10, 10), randint(-10, 10)]
        ball = Ball(ball_image,position,speed,bg_size)
        balls.append(ball)

    clock = pygame.time.Clock()

    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()

        screen.blit(background,(0, 0))

        for each in balls:
            each.move()
            screen.blit(each.image,each.rect)

        pygame.display.flip()
        clock.tick(30)

if __name__ == "__main__":
    main()