# pygame achieves the elastic ball and its variable speed effect

• 2020-06-07 04:50:16
• OfStack

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.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.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()
``````

Related articles: