Question

我编写了一个动画（在python中），用于沙滩球在屏幕上反弹。我现在希望在窗口添加第二个球，当两个球碰撞时它们互相反弹。

到目前为止，我对此的尝试都没有成功。任何想法如何做到这一点？我到目前为止的代码如下。

import pygame

import sys

if __name__ =='__main__':

    ball_image = 'Beachball.jpg'
    bounce_sound = 'Thump.wav'
    width = 800
    height = 600
    background_colour = 0,0,0
    caption= 'Bouncing Ball animation'
    velocity = [1,1]
    pygame.init ()
    frame = pygame.display.set_mode ((width, height))
    pygame.display.set_caption (caption)
    ball= pygame.image.load (ball_image). convert()
    ball_boundary = ball.get_rect (center=(300,300))
    sound = pygame.mixer.Sound (bounce_sound)
    while True:
        for event in pygame.event.get():
            print event 
            if event.type == pygame.QUIT: sys.exit(0)
        if ball_boundary.left < 0 or ball_boundary.right > width:
            sound.play()
            velocity[0] = -1 * velocity[0]
        if ball_boundary.top < 0 or ball_boundary.bottom > height:
            sound.play()
            velocity[1] = -1 * velocity[1]

        ball_boundary = ball_boundary.move (velocity)
        frame.fill (background_colour)
        frame.blit (ball, ball_boundary)
        pygame.display.flip()

Answer 1

这是您的代码的一个非常基本的重组。它仍然可以整理很多，但它应该告诉你如何使用该类的实例。

import pygame
import random
import sys

class Ball:
    def __init__(self,X,Y):
        self.velocity = [1,1]
        self.ball_image = pygame.image.load ('Beachball.jpg'). convert()
        self.ball_boundary = self.ball_image.get_rect (center=(X,Y))
        self.sound = pygame.mixer.Sound ('Thump.wav')

if __name__ =='__main__':
    width = 800
    height = 600
    background_colour = 0,0,0
    pygame.init()
    frame = pygame.display.set_mode((width, height))
    pygame.display.set_caption("Bouncing Ball animation")
    num_balls = 1000
    ball_list = []
    for i in range(num_balls):
        ball_list.append( Ball(random.randint(0, width),random.randint(0, height)) )
    while True:
        for event in pygame.event.get():
            print event 
            if event.type == pygame.QUIT:
                sys.exit(0)
        frame.fill (background_colour)
        for ball in ball_list:
            if ball.ball_boundary.left < 0 or ball.ball_boundary.right > width:
                ball.sound.play()
                ball.velocity[0] = -1 * ball.velocity[0]
            if ball.ball_boundary.top < 0 or ball.ball_boundary.bottom > height:
                ball.sound.play()
                ball.velocity[1] = -1 * ball.velocity[1]

            ball.ball_boundary = ball.ball_boundary.move (ball.velocity)
            frame.blit (ball.ball_image, ball.ball_boundary)
        pygame.display.flip()

Answer 2

你应该创建一个代表你的沙滩球的课程。然后，您可以根据需要添加实例，并将实例放在Python列表中。

然后，您将在每个帧上浏览该列表，更新并呈现每个帧。

您需要包含一种方法来测试与另一个球的碰撞（这对圆圈来说很简单）。如果检测到碰撞，所涉及的球应该模拟彼此反弹。

如何在窗户上添加第二个弹跳球？

2 个答案: