Blinking Snowfall Animation using PyGame

Snowfall_Animation_Blinking_PyGame.py

"""
@author : Psycho_Coder

For Details : http://www.rawcoders.com/Thread-Python-Blinking-Snowfall-Animation-using-PyGame
"""

import os
import random
import sys
import pygame
from pygame.constants import KEYDOWN, K_ESCAPE, NOFRAME


class SnowFall:

    def __init__( self, size = ( 640, 480 ), NO_OF_FLAKES = 100 ):

        pygame.init()

        os.environ['SDL_VIDEO_CENTERED'] = '1'
        self.screen_depth = 32

        if size is not None and type( size ) is tuple or type( size ) is list and len( size ) == 2:
            self.size = ( self.width, self.height ) = size
        else:
            raise ValueError( "size must be a tuple or list of width or height and should not be mull" )

        if NO_OF_FLAKES is not None and type( NO_OF_FLAKES ) is int and  NO_OF_FLAKES > 0:
            self.NO_OF_FLAKES = NO_OF_FLAKES
        else:
            raise ValueError( "NO_OF_FLAKES must be int and greater than zero." )

        self.white = ( 255, 255, 255 )
        self.rCBack = ( 27, 27, 27 )

        self.screen = pygame.display.set_mode( size, NOFRAME, self.screen_depth )
        self.screen.fill( self.rCBack )

        self.FPS = 30
        self.timer = pygame.time.Clock()

        self.game_loop()

    def game_loop( self ):

        snow_flakes_list = []
        loc_x, loc_y = 0, 0

        img = pygame.image.load( "images/snowman.gif" ).convert_alpha()
        imgw, imgh = img.get_size()

        img1 = pygame.image.load( "images/snowman2.gif" ).convert_alpha()
        imgw1, imgh1 = img1.get_size()

        img2 = pygame.image.load( "images/angelglobe.gif" ).convert_alpha()
        imgw2, imgh2 = img2.get_size()

        for i in range( self.NO_OF_FLAKES ):
            loc_x = random.randrange( 0, self.width )
            loc_y = random.randrange( 0, self.height )
            snow_flakes_list.append( [ loc_x, loc_y ] )

        while True:
            for event in pygame.event.get():
                if event.type == KEYDOWN and event.key == K_ESCAPE:
                    pygame.quit()
                    sys.exit()

            self.screen.fill( self.rCBack )
            self.screen.blit( img, ( self.width - imgw, self.height - imgh ) )
            self.screen.blit( img1, ( 0 , self.height - imgh1 ) )
            self.screen.blit( img2, ( ( self.width - imgw2 ) // 2, self.height - imgh2 ) )

            for i in range( len( snow_flakes_list ) ):
                pygame.draw.circle( self.screen, self.white, snow_flakes_list[i], random.choice( [2, 3, 4] ) )
                snow_flakes_list[i][1] += 1

                if snow_flakes_list[i][1] > self.height:
                    snow_flakes_list[i][1] = random.randrange( -30, -20 )
                    snow_flakes_list[i][0] = random.randrange( 0, self.width )

            pygame.display.update()
            self.timer.tick( self.FPS )


def main():
    SnowFall( ( 800, 600 ), 150 )

if __name__ == "__main__":
    main()

Hey Buddy...Where are the images " images/snowman.gif" and others. Your project looks cool . I tried to clone your repo and tried to run it. It threw me an error "Couldn't open images " .Can you please add the folder images with the repo so that I can try to run . Pardon me if I am wrong . I am actually new to pygame and came across your project and felt its pretty awsome.

Hi BaxiAbhijit

I have attached the images. Sorry for the late reply.

I needed an image to flicker for a few seconds, I hadn't even considered random.choices... Thanks.