pygame achieves the elastic ball and its variable speed effect

This article shares the specific code of pygame to realize the elastic ball and its variable speed effect for your reference. The specific content is as follows

Expectations:

1. The ball bounces when it touches the frame

2. Set the speed button and press it to change the speed and color of the sphere

Specific implementation:

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


class Circle(object):
 #  Set up the Circle Class attribute 
 def __init__(self):
  self.vel_x = 1
  self.vel_y = 1
  self.radius = 20
  self.pos_x, self.pos_y = random.randint(0, 255), random.randint(0, 255)
  self.width = 0
  self.color = 0, 0, 0

 #  Ball color speed change method 
 def change_circle(self, number):
  self.color = random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)
  #  Prevent the direction of the ball's velocity from changing 
  if self.vel_x < 0:
   self.vel_x = -number
  else:
   self.vel_x = number
  if self.vel_y < 0:
   self.vel_y = -number
  else:
   self.vel_y = number
  # self.vel_x, self.vel_y = number, number  If you leave it alone, the direction of the velocity will change 

 def circle_run(self):
  #  Prevent the sphere from exceeding the game interface box 
  if self.pos_x > 580 or self.pos_x < 20:
   self.vel_x = -self.vel_x

  if self.pos_y > 480 or self.pos_y < 20:
   self.vel_y = -self.vel_y
  self.pos_x += self.vel_x
  self.pos_y += self.vel_y
  pos = self.pos_x, self.pos_y
  pygame.draw.circle(screen, self.color, pos, self.radius, self.width)

pygame.init()
screen = pygame.display.set_mode((600, 500))
# Circle The instance 
circle1 = Circle()

while True:
 for event in pygame.event.get():
  if event.type == QUIT:
   sys.exit()
  elif event.type == KEYUP:
   if event.key == pygame.K_1:
    circle1.change_circle(1)
   elif event.key == pygame.K_2:
    circle1.change_circle(2)
   elif event.key == pygame.K_3:
    circle1.change_circle(3)
   elif event.key == pygame.K_4:
    circle1.change_circle(4)

 screen.fill((0, 0, 100))

 circle1.circle_run()

 pygame.display.update()