pygame实现弹力球及其变速效果

本文实例为大家分享了pygame实现弹力球及其变速效果的具体代码，供大家参考，具体内容如下

期望：

1.球体接触到框体后反弹

2.设置速度按键，按下后改变球体速度、颜色状态

具体实现：

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

class Circle(object):
# 设置Circle类属性
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

# 球体颜色速度改变方法
def change_circle(self, number):
 self.color = random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)
 # 防止球体速度方向发生改变
 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 如果仅此句，速度方向会发生改变

def circle_run(self):
 # 防止球体超出游戏界面框体
 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实例
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()