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import random | |
import time | |
import turtle | |
rotation_speed = 0.5 | |
spawn_interval = 0.05 | |
ball_speed = 2 | |
# Set up window | |
window = turtle.Screen() | |
window.tracer(0) | |
spinner = turtle.Turtle() | |
# Spawn new balls | |
colour = random.random(), random.random(), random.random() | |
balls = [] | |
pool_of_balls = [] | |
def spawn_ball(reference): | |
if pool_of_balls: | |
balls.append(pool_of_balls.pop()) | |
balls[-1].showturtle() | |
else: | |
balls.append(turtle.Turtle()) | |
balls[-1].shape("circle") | |
balls[-1].color(colour) | |
balls[-1].turtlesize(0.5) | |
balls[-1].penup() | |
balls[-1].setposition(reference.position()) | |
balls[-1].setheading(reference.heading()) | |
# Main animation loop | |
spawn_timer = time.time() | |
while True: | |
spinner.left(rotation_speed) | |
# Spawn new ball | |
if time.time() - spawn_timer > spawn_interval: | |
spawn_ball(spinner) | |
spawn_timer = time.time() | |
# Move all balls and clear balls that leave the screen | |
for ball in balls.copy(): | |
ball.forward(ball_speed) | |
# Check if ball has left the screen | |
if ( | |
abs(ball.xcor()) > window.window_width() / 2 | |
or abs(ball.ycor()) > window.window_height() / 2 | |
): | |
ball.hideturtle() | |
balls.remove(ball) | |
pool_of_balls.append(ball) | |
print(len(balls), len(pool_of_balls), len(turtle.turtles())) | |
window.update() |
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