magic-sparkle-15.py

# magic_sparkle.py

import random
import turtle
import time

from dot import Dot

BACKGROUND_COLOUR = "#1a6b72"

frame_rate = 60

spawn_delay_range = 0.15, 0.25
dot_size_range = 0.05, 0.5
dot_speed_range = 0.5, 1

lead_dot_speed = 2
lead_dot_rotation_angle = 5

window = turtle.Screen()
window.tracer(0)
window.bgcolor(BACKGROUND_COLOUR)

lead_dot = turtle.Turtle()
lead_dot.shape("circle")
lead_dot.color("white")
lead_dot.penup()


def turn_left():
    lead_dot.left(lead_dot_rotation_angle)


def turn_right():
    lead_dot.right(lead_dot_rotation_angle)


window.onkeypress(turn_left, "Left")
window.onkeypress(turn_right, "Right")
window.listen()

dots = []

delay = 0
interval_start = 0
while True:
    start_frame_time = time.time()

    lead_dot.forward(lead_dot_speed)
    # Spawn a new dot every half a second (for now)
    if time.time() - interval_start > delay:
        interval_start = time.time()
        delay = (
            random.random()
            * (spawn_delay_range[1] - spawn_delay_range[0])
            + spawn_delay_range[0]
        )
        dots.append(
            Dot(
                lead_dot.xcor(),
                lead_dot.ycor(),
                dot_size_range,
                dot_speed_range,
            )
        )

    # Move all the dots
    for dot in dots:
        dot.fall()
        if dot.ycor() < -window.window_height() / 2:
            dots.remove(dot)
            turtle.turtles().remove(dot)

    # Add delay if needed to fix frame rate
    frame_time = time.time() - start_frame_time
    if frame_time < 1 / frame_rate:
        time.sleep(1 / frame_rate - frame_time)

    window.update()