Show Winter Snowfall Animation Using Python 3 Arcade Library

pip install arcade

# Import required modules
import random
import math
import arcade



# Adjust window attributes
Width = 800
Height = 600
Title = "SnowFall"



class snow_fall:
  def __init__(self):
    self.x = 0
    self.y = 0

  def reset_snow(self):
    
    # Reset flake to random position above screen
    self.y = random.randrange(Height, Height + 100)
    self.x = random.randrange(Width)



class snowfall(arcade.Window):
  def __init__(self, width, height, title):
    
    # Calls "__init__" of parent class
    # (arcade.Window) to setup screen
    super().__init__(width, height, title)

  def start_snowfall(self):
    
    # Set up snowfall and initialize variables.
    self.snowfall_list = []

    for i in range(50):
      
      # Create snowfall instance
      snowfall = snow_fall()

      # Randomly position snowfall
      snowfall.x = random.randrange(Width)
      snowfall.y = random.randrange(Height + 200)

      # Set other variables for the snowfall
      snowfall.size = random.randrange(8)
      snowfall.speed = random.randrange(20, 40)
      snowfall.angle = random.uniform(math.pi, math.pi * 2)

      # Add snowflake to snowfall list
      self.snowfall_list.append(snowfall)

    # Set the background color
    arcade.set_background_color(arcade.color.BLUE)

  def on_draw(self):
    
    # This command is necessary before drawing
    arcade.start_render()

    # Draw the current position of each snowfall
    for snowfall in self.snowfall_list:
      arcade.draw_circle_filled(snowfall.x, snowfall.y,
                  snowfall.size, arcade.color.WHITE)

  def on_update(self, delta_time):
    
    # Animate all the snowfall falling
    for snowfall in self.snowfall_list:
      snowfall.y -= snowfall.speed * delta_time

      # Check if snowfall has fallen below screen
      if snowfall.y < 0:
        snowfall.reset_snow()

      # Some math to make the snowfall move side to side
      snowfall.x += snowfall.speed * \
        math.cos(snowfall.angle) * delta_time
      snowfall.angle += 1 * delta_time



# Driver Code
if __name__ == "__main__":
  screen = snowfall(800, 600, "Snow")
  screen.start_snowfall()
  arcade.run()