Pygame snow particles part 2

I made some changes to the particle script I showed some days ago (here). The result is a little more complicated and maybe nicer, but it’s made just to deepen a little bit our knowledge of particles with pygame.

I made a class Particle to use this code also in other applications easily, maybe.

The snow is visible from the window inside an imaginary house

The code of the particles generator

# pygame.math module
# https://www.pygame.org/docs/ref/math.html
#
# Pygame swap text with another text
# https://stackoverflow.com/questions/60944070/pygame-swap-text-with-another-text/60953697#60953697
#
# GitHub - PyGameExamplesAndAnswers - Draw 2D - Particles
# https://github.com/Rabbid76/PyGameExamplesAndAnswers/blob/master/documentation/pygame/pygame_2D.md

import pygame
import random
import sys

class Particle:
    def __init__(self):
        pygame.init()
        self.screen = pygame.display.set_mode((300, 300))
        self.clock = pygame.time.Clock()
        self.snow = pygame.image.load("snow.png").convert()
        self.cloud = pygame.image.load("cloud.png")
        self.window2 = pygame.image.load("window2.png")
        self.particles = []

    def mainloop(self):
        run = True
        while run:
            self.clock.tick(60)
            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    run = False
            # it adds particles until they are removed
            # if the size - [2] - is smaller than 0
            self.screen.blit(self.snow, (0,0))
            self.particles_generator()
            self.screen.blit(self.cloud, (-110,-100))
            self.screen.blit(self.cloud, (-50, 250))
            self.screen.blit(self.window2, (0, 0))
            pygame.display.flip()

        pygame.quit()
        exit()
    # list of particles

    # the surface with the snow as a background
    def particles_generator(self):
        "This makes the circles move rfrom random start position at the top until bottome and the disappear"

        # Every particle starts at a random horizontal position at the top
        self.particles.append([
        	[random_pos(), 50], # [0][0] coordinates for circle posit.
        	[
                random.randint(0, 20) / 10 - 1, # moves left or right
                2], # goes down same speed
        	random.randint(4, 6)]) # [0][2] size or radius

        # Every particle  moves... if particles[2] (the radius) is >= than 0 it is removed
        for particle in self.particles[:]:
            # the starting point changes going right or left
            particle[0][0] += particle[1][0] # the x movement random
            particle[0][1] += particle[1][1] # the y movement fixed 2
                                            # but increases down here
            particle[2] -= 0.005 # the snowflake shriks
            particle[1][1] += 0.01 # * random.randint(-3, 6) # increase down speed a bit
            if particle[2] <= 0:
                self.particles.remove(particle)

        # draws a circle on the screen white, at x y corrds and with a ray of particle[2]
        for particle in self.particles:
            pos = particle[0][0]
            speed = particle[0][1]
            radius = particle[2]
            # circle: surface, color, pos, radius
            pygame.draw.circle(
            	self.screen,
            	(255, 244, 255), # color
            	(
            		round(pos), # Pos x, y
            		round(speed)), # direction / speed
            		round(radius)) # radius
def random_pos():
	" to make a flame like particles [150, 20] # flame, so that all circles with start at the same point"
	return random.randint(0, 300)
	# return 150



fx = Particle()
fx.mainloop()

Single images