karel_asset/demos/karel_zoomer.py

from graphics import Canvas
from karel_asset import *   # https://git.h0v1n8.nl/Stanford/karel_asset
from time import sleep
    
CANVAS_WIDTH = 400
CANVAS_HEIGHT = 400

def main():
    canvas = Canvas(CANVAS_WIDTH, CANVAS_HEIGHT)
    
    while True: # Loop forever
        background = generate_random_background(canvas)
        sleep(0.5)

        # Set up asset stack
        amount = random.randint(5, 10)  # Pick random amount of assets
        stack = {}  # Create stack dictionary
        for _ in range(amount): # Create the amount of assets
            asset = generate_random_asset(canvas, karel_prevelance=6, centre_x=int(CANVAS_WIDTH / 2), centre_y=int(CANVAS_HEIGHT / 2), size=0)   # Generate asset
            delay = random.randint(0, int(canvas.width * 1))    # Set random delay of a maximum of two canvas widths
            speed = random.choice((1, 2, 3, 4, 5))  # Set random speed
            name = "karel_" + str(_)    # Set dictionary key
            stack.update({name: [asset, delay, speed]}) # Append entry to dictionary
        
        # Slide assets 
        for i in range(int(canvas.width * 1.5)):   # Zoom for 1.5 canvas widths
            for key, value in stack.items():    # Loop over asset dictionary
                if value[1] < i:    # If delay has passed
                    asset = relative_resize_asset(value[0], size_difference=value[2]) # Resize the assset
                    stack.update({key: [asset, value[1], value[2]]})    # Update the dictionary
            sleep(0.01) # Wait shortly so the sliding is not CPU speed based
        
        # Erase assets in asset stack
        for value in stack.values():
            erase_asset(value[0])

        # Erase background for in the next loop a new one will be created
        canvas.delete(background)

if __name__ == '__main__':
    main()