lines_class.py

import pygame
import random

WIDTH = 800
HEIGHT = 600

NB_GROUPS = 5
HISTO_SIZE = 8
LINE_COLOR = (255,255,255)
BKG_COLOR = (0,0,0)
REFRESH_MS = 100

class MovingPoint():

    def __init__(self, x, y):
        
        self.xs = [x]
        self.ys = [y]
        
        self.x_ = random.randint(-10, 10)
        self.y_ = random.randint(-10, 10)
        
    def move(self):

        x = self.xs[0] + self.x_
        y = self.ys[0] + self.y_
        
        if not x in range(WIDTH):
            self.x_ *= -1

        if not y in range(HEIGHT):
            self.y_ *= -1

        self.xs = [x] + self.xs[:HISTO_SIZE]
        self.ys = [y] + self.ys[:HISTO_SIZE]

points = [MovingPoint(random.randrange(WIDTH), random.randrange(HEIGHT)) for _ in range(NB_GROUPS*2)]

pygame.init()

screen = pygame.display.set_mode((WIDTH, HEIGHT))

while True:
    
    screen.fill(BKG_COLOR)
    
    for p1, p2 in zip(points[::2], points[1::2]):
        for i in range(len(p1.xs)):
            pygame.draw.line(screen, LINE_COLOR, (p1.xs[i], p1.ys[i]), (p2.xs[i], p2.ys[i]))

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
        
    [p.move() for p in points]
        
    pygame.display.update()
    
    pygame.time.delay(100)